[rbridge] Multiple instance/hierarchical RBridge topologies
Radia.Perlman at sun.com (Radia Perlman) Sat, 23 December 2006 06:35 UTC
From: "Radia.Perlman at sun.com"
Date: Fri, 22 Dec 2006 22:35:44 -0800
Subject: [rbridge] Multiple instance/hierarchical RBridge topologies
Message-ID: <458CCE40.4050403@sun.com>
After talking to a bunch of people, I think I understand a feature, and here are thoughts on how to implement it. The two problems we might solve: a) ensure that two different RBridged clouds don't accidentally merge b) allow a hierarchy of RBridged clouds (yes, similar to L2VPN or provider backbone bridges) In the case of b) it would be useful to encapsulate data packets with a customer ID, whereas such a field would not be necessary for a customer campus/CRED/RBridged-cloud. IS-IS already has a field "area address" that can be configured to keep two IS-IS instances separate. So, for instance, the default can be area=0, but if there are two different RBridged clouds that are intended to be kept separate, but they are physically close enough that someone is afraid they might accidentally merge, then you can configure the area address in all of the RBridges in at least one of the clouds to prevent two alien RBridges from talking to each other. For hierarchy, we could do the same thing (configure the higher layer RBridge cloud to have an area address something other than 0). That way customer RBridged nets would not accidentally merge with the core instance. But as I'll explain, I think the backbone RBridges would need to be slightly different from the lower-level RBridges. There are two "community" things that we want to keep separate, and let's call them "customers" and "VLANs within customer". RBridges as currently specified keep VLANs separated. However, if we have a higher level of RBridges connecting customers, each of whom are using VLANs, the core RBridges need to keep separate communities of (customer, VLAN) pairs. So let's think of a "community" as having a hierarchically assigned "community" name, which would be "customer ID" concatenated with VLAN tag, or (customer, VLAN). The rule is that two endnodes can only talk to each other if they are in the same tuple (customer, VLAN). This really results in all the same algorithms as RBridges already do in terms of filtering so that multicasts within a VLAN stay within a VLAN, except that it's a bigger field: it's (customer, VLAN) now. Therefore, the difference between case a) and b) above is that RBridges also have to know how many components are in the community tag. In a) RBridges assume the community is specified by the VLAN tag in the inner packet. In b), we need for RBridges in the backbone to add another field to specify another level of hierarchy in the tag. In an earlier note, we were suggesting using a VLAN tag in the outer header. But perhaps it would be more cleanly expressed as another field in the shim header used by the backbone RBridges. So, here is a suggestion: Make the "area address" in IS-IS have two parts: (level of hierarchy | name). The default is level=0, and name=0. Backbone RBridges would use level=1, and name could be anything, but all RBridges in the same cloud all have to be configured with the same name (0 would work). RBridges at level 1 will encapsulate data packets with an extra field (say 16-bits), that separates communities. So at level 1, we'd add to the shim a 16-bit field, that we could think of as "customer ID". So if the shim header is 6 bytes at level 0, it would be 8 bytes at level 1, since it would also have the extra "customer" field. I don't think we'd ever need more than 2 levels, but we might want to think about that -- I'd guess we'd assume 2 "customer ID" fields in the shim at level 2. At level 1, in the per-VLAN instance which passes around endnode information and IP multicast membership, the only difference would be like having a VLAN tag which is 28 bits (12 plus 16), and in theory, one could have 2^28 instances of IS-IS passing around endnode information across the backbone. Comments? I hope I'm being reasonably clear. Radia Received: from mail-mta.sunlabs.com (edge.sunlabs.com [204.153.12.50]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBN6ZiTV027517 for <rbridge@postel.org>; Fri, 22 Dec 2006 22:35:44 -0800 (PST) Received: from mail.sunlabs.com ([152.70.2.186]) by dps.sfvic.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTP id <0JAP00C7ARNJMG00@dps.sfvic.sunlabs.com> for rbridge@postel.org; Fri, 22 Dec 2006 22:35:43 -0800 (PST) Received: from sun.com ([129.150.24.30]) by mail.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTPSA id <0JAP00966RNHT3X2@mail.sunlabs.com> for rbridge@postel.org; Fri, 22 Dec 2006 22:35:41 -0800 (PST) Date: Fri, 22 Dec 2006 22:35:44 -0800 From: Radia Perlman <Radia.Perlman@sun.com> To: rbridge@postel.org Message-id: <458CCE40.4050403@sun.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-transfer-encoding: 7BIT X-Accept-Language: en-us, en User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4.1) Gecko/20031008 X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: radia.perlman@sun.com Subject: [rbridge] Multiple instance/hierarchical RBridge topologies X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Sat, 23 Dec 2006 06:36:18 -0000 Status: RO Content-Length: 3848 After talking to a bunch of people, I think I understand a feature, and here are thoughts on how to implement it. The two problems we might solve: a) ensure that two different RBridged clouds don't accidentally merge b) allow a hierarchy of RBridged clouds (yes, similar to L2VPN or provider backbone bridges) In the case of b) it would be useful to encapsulate data packets with a customer ID, whereas such a field would not be necessary for a customer campus/CRED/RBridged-cloud. IS-IS already has a field "area address" that can be configured to keep two IS-IS instances separate. So, for instance, the default can be area=0, but if there are two different RBridged clouds that are intended to be kept separate, but they are physically close enough that someone is afraid they might accidentally merge, then you can configure the area address in all of the RBridges in at least one of the clouds to prevent two alien RBridges from talking to each other. For hierarchy, we could do the same thing (configure the higher layer RBridge cloud to have an area address something other than 0). That way customer RBridged nets would not accidentally merge with the core instance. But as I'll explain, I think the backbone RBridges would need to be slightly different from the lower-level RBridges. There are two "community" things that we want to keep separate, and let's call them "customers" and "VLANs within customer". RBridges as currently specified keep VLANs separated. However, if we have a higher level of RBridges connecting customers, each of whom are using VLANs, the core RBridges need to keep separate communities of (customer, VLAN) pairs. So let's think of a "community" as having a hierarchically assigned "community" name, which would be "customer ID" concatenated with VLAN tag, or (customer, VLAN). The rule is that two endnodes can only talk to each other if they are in the same tuple (customer, VLAN). This really results in all the same algorithms as RBridges already do in terms of filtering so that multicasts within a VLAN stay within a VLAN, except that it's a bigger field: it's (customer, VLAN) now. Therefore, the difference between case a) and b) above is that RBridges also have to know how many components are in the community tag. In a) RBridges assume the community is specified by the VLAN tag in the inner packet. In b), we need for RBridges in the backbone to add another field to specify another level of hierarchy in the tag. In an earlier note, we were suggesting using a VLAN tag in the outer header. But perhaps it would be more cleanly expressed as another field in the shim header used by the backbone RBridges. So, here is a suggestion: Make the "area address" in IS-IS have two parts: (level of hierarchy | name). The default is level=0, and name=0. Backbone RBridges would use level=1, and name could be anything, but all RBridges in the same cloud all have to be configured with the same name (0 would work). RBridges at level 1 will encapsulate data packets with an extra field (say 16-bits), that separates communities. So at level 1, we'd add to the shim a 16-bit field, that we could think of as "customer ID". So if the shim header is 6 bytes at level 0, it would be 8 bytes at level 1, since it would also have the extra "customer" field. I don't think we'd ever need more than 2 levels, but we might want to think about that -- I'd guess we'd assume 2 "customer ID" fields in the shim at level 2. At level 1, in the per-VLAN instance which passes around endnode information and IP multicast membership, the only difference would be like having a VLAN tag which is 28 bits (12 plus 16), and in theory, one could have 2^28 instances of IS-IS passing around endnode information across the backbone. Comments? I hope I'm being reasonably clear. Radia Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by boreas.isi.edu (8.13.8/8.13.8) with SMTP id kBM4fIWf025442 for <rbridge@postel.org>; Thu, 21 Dec 2006 20:41:18 -0800 (PST) X-VirusChecked: Checked X-Env-Sender: Donald.Eastlake@motorola.com X-Msg-Ref: server-14.tower-137.messagelabs.com!1166762476!4436678!1 X-StarScan-Version: 5.5.10.7; banners=-,-,- X-Originating-IP: [129.188.136.8] Received: (qmail 22309 invoked from network); 22 Dec 2006 04:41:17 -0000 Received: from motgate8.mot.com (HELO motgate8.mot.com) (129.188.136.8) by server-14.tower-137.messagelabs.com with SMTP; 22 Dec 2006 04:41:17 -0000 Received: from il06exr03.mot.com (il06exr03.mot.com [129.188.137.133]) by motgate8.mot.com (8.12.11/Motorola) with ESMTP id kBM4fGch001845 for <rbridge@postel.org>; Thu, 21 Dec 2006 21:41:16 -0700 (MST) Received: from de01exm64.ds.mot.com (de01exm64.am.mot.com [10.176.8.15]) by il06exr03.mot.com (8.13.1/8.13.0) with ESMTP id kBM4fGxr000195 for <rbridge@postel.org>; Thu, 21 Dec 2006 22:41:16 -0600 (CST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 21 Dec 2006 23:41:15 -0500 Message-ID: <3870C46029D1F945B1472F170D2D979001D9CD35@de01exm64.ds.mot.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Draft-trill-rbridge-protocol-01.txt Thread-Index: Acclg2nYEM0uVGWlQfqf2O7PLWxwJg== From: "Eastlake III Donald-LDE008" <Donald.Eastlake@motorola.com> To: <rbridge@postel.org> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: donald.eastlake@motorola.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBM4fIWf025442 Subject: [rbridge] Draft-trill-rbridge-protocol-01.txt X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 22 Dec 2006 04:41:28 -0000 Status: RO Content-Length: 1478 Hi, I just noticed that no message from the Secretariat seems to have gotten through to the working group mailing list when this draft was uploaded into the ID directories. Anyway, its been there for a bit over a week. Below are some quick comments on it. Thanks, Donald ------------------------------------------------------------------ Quick Comments on draft-ietf-trill-rbridge-protocol-01.txt Section 1, next to last bullet point at bottom of page 4: Text has not been updated for the designation of two Rbridges in the shim. Section 1, third paragraph at the top of page 5: I would think there would also be cases where the VLAN tag was removed by the endnode. Section 2.1.1, on page 7: The 2nd and 3rd paragraphs of this section have a significant amount of redundancy between them. Section 2.1.1, near the top of page 8: The list of core-Rbridge information seems to be missing the Rbridge nickname. Section 2.3, first paragraph on page 11: "the specified Rbridge in the shim" sounds like wording from when there was only one. Suggest rewording this. Section 2.3, first bullet point on page 11: Should that be "IP multicast routers"? Section 2.5, first paragraph, page 13: Suggest changing "it is desirable" to "it may be desirable". Section 2.5 second paragraph, Page 11: Typo: B2-B2-R1 should be B2-B1-R1. Section 28.1, first normative reference on page 22: The D should be capitalized in 802.1D. Perhaps a reference to 802.1Q should be added. Received: from brmea-mail-3.sun.com (brmea-mail-3.Sun.COM [192.18.98.34]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBKItPhc024896 for <rbridge@postel.org>; Wed, 20 Dec 2006 10:55:29 -0800 (PST) Received: from jurassic.eng.sun.com ([129.146.58.166]) by brmea-mail-3.sun.com (8.13.6+Sun/8.12.9) with ESMTP id kBKItMZD027136; Wed, 20 Dec 2006 11:55:22 -0700 (MST) Received: from [192.9.61.11] (punchin-nordmark.SFBay.Sun.COM [192.9.61.11]) by jurassic.eng.sun.com (8.13.8+Sun/8.13.8) with ESMTP id kBKItLPR977098 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 20 Dec 2006 10:55:21 -0800 (PST) Message-ID: <45898719.2010405@sun.com> Date: Wed, 20 Dec 2006 10:55:21 -0800 From: Erik Nordmark <erik.nordmark@sun.com> User-Agent: Thunderbird 1.5.0.5 (X11/20060911) MIME-Version: 1.0 To: "Developing a hybrid router/bridge." <rbridge@postel.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: erik.nordmark@sun.com Subject: [rbridge] Suggested updates to our milestones X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 20 Dec 2006 18:55:36 -0000 Status: RO Content-Length: 1384 The current milestones remaining (i.e. not already marked as DONE) are: Aug 2006 Submit architecture document to IEEE/IETF expert review Aug 2006 Submit routing protocol requirements to the IESG for publication as an Informational RFC Aug 2006 Submit problem statement and applicability to IESG for Informational RFC Nov 2006 Submit architecture document to the IESG for publication as an Informational RFC Dec 2006 Choose routing protocol(s) that can meet the requirements Dec 2006 Submit base protocol specification to IEEE/IETF expert review Mar 2007 Base protocol specification submitted to the IESG for publication as a Proposed Standard RFC Jul 2007 Re-charter or shut down the WG Suggested new milestone dates: Jan 2007 Submit architecture document to IEEE/IETF expert review Jan 2007 Submit routing protocol requirements to the IESG for publication as an Informational RFC Mar 2007 Choose routing protocol(s) that can meet the requirements Mar 2007 Submit architecture document to the IESG for publication as an Informational RFC Apr 2007 Submit problem statement and applicability to IESG for Informational RFC May 2007 Base protocol specification submitted to the IESG for publication as a Proposed Standard RFC Jul 2007 Re-charter or shut down the WG Erik & Donald Received: from smtp03.uc3m.es (smtp03.uc3m.es [163.117.136.123]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBFIGV6V023976 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Fri, 15 Dec 2006 10:16:33 -0800 (PST) Received: from smtp03.uc3m.es (localhost [127.0.0.1]) by localhost.uc3m.es (Postfix) with ESMTP id 37A6140448; Fri, 15 Dec 2006 19:16:30 +0100 (CET) Received: from [163.117.55.85] (unknown [163.117.55.85]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp03.uc3m.es (Postfix) with ESMTP id 9296540172; Fri, 15 Dec 2006 19:16:25 +0100 (CET) Message-ID: <4582E664.5040105@it.uc3m.es> Date: Fri, 15 Dec 2006 19:16:04 +0100 From: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Don Fedyk <dwfedyk@nortel.com> References: <34B3EAA5B3066A42914D28C5ECF5FEA40C75D3E1@zrtphxm2.corp.nortel.com> In-Reply-To: <34B3EAA5B3066A42914D28C5ECF5FEA40C75D3E1@zrtphxm2.corp.nortel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gibanez@it.uc3m.es Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 15 Dec 2006 18:17:04 -0000 Status: RO Content-Length: 11958 Don, See inline Guillermo Don Fedyk escribi?: > Hi Guillermo > > See Inline. > > >> -----Original Message----- >> From: Guillermo Ib??ez [mailto:gibanez@it.uc3m.es] >> >> >> My previous message perhaps was not too clear. Please bear >> with me and >> my english :-) >> - 802.1ah assumes no legacy bridges in the middle. >> > This is false. 802.1ah is backwards compatible with legacy bridges. However I think it would be safe to say this is not a plug and play option. 802.1ah would need to be configured to know the legacy bridges capabilities. But 802.1ah header is compatible with 802.1Q header for forwarding. The same trick that a TRILL RBridge uses. > > I am not at all expert on 802.1ah , but I does not look simple to manage legacy bridges interposed. And away from the zero configuration target. >> - AFAK, 802.1ah does not assume routing between nodes. If so, >> it would >> likely require TTL field. >> > 802.1ah bridges from ingress to egress PBB nodes. Whether the service is IP or Ethernet on the ingress/egress PBB is a box question not outside the scope of 802.1ah architecture. > > 802.1ah bridges, does not route. >> - TRILL does assume legacy bridges between Rbridges >> - TRILL is not a subset of 802.1ah, it is different thing >> > I don't think people ever said TRILL was a subset of 802.1ah. > What I said was certain versions of the TRILL header look remarkably like the 802.1ah header. Following this logic I then said start from 802.1ah. This has not yielded any results because the part that looks like 802.1ah is hop by hop part and 802.1ah does not have a hop by hop DA part. > > That is the key point. Hop by hop part, directly related to handle the intermediate legacy bridges problem. >> - 802.1ah is not a example of simplicity. >> > I don't think this type of generalization adds any value. We are talking headers and every field in 802.1ah has a purpose and good value for the bits. > > Sorry. I meant "in the campus networks context". >> - It is too late to question TRILL basic assumptions and try to merge >> 802.1ah with TRILL encapsulation. >> > If you asked me if I see value in merging right now I would say no since the point to point header is not mainstream TRILL. > > Agree. The key point again. >> - If the whole TRILL approach is questioned (I assume it is not the >> case), 802.1ah does not seem the way to go regarding simplicity in >> campus networks. >> > No one suggested you put a provider backbone bridge in place of an Rbridge. The comment was could you use the same Frame format for the packet encaps and related functions? And that is not looking promising. > > Regards, > Don > > > >> Guillermo >> >> Guillermo Ib??ez escribi?: >> >>> Just a side comment. >>> I think the ongoing discussion is not about encapsulation >>> >> but about the >> >>> fundamentals of RBridges approach versus 802.1ah's. So, >>> >> while agreeing >> >>> on the great sinergies of a common encapsulation, lack of >>> >> TTL is an >> >>> essential point that reflects the essential difference in >>> >> the deployment >> >>> fields assumed. >>> If we assume a deployment field as for 802.1ah, encapsulations and >>> proposals much simpler than 802.1ah are possible (one is >>> >> described in my >> >>> ABridges draft). If this is the case we should restart WG >>> >> discussion >> >>> from the beguinning. >>> Encapsulation for RBridges is not simple, and 802.1ah isn't simple >>> either, specially considering the campus networks of >>> >> moderate sizes that >> >>> are the target for RBridges. >>> Guillermo >>> >>> >>> Gray, Eric escribi?: >>> >>>> Don, >>>> >>>> I think you've garbled the discussion, somewhat. >>>> >>>> Please see below... >>>> >>>> -- >>>> Eric >>>> >>>> >>>> >>>>> -----Original Message----- >>>>> From: Don Fedyk [mailto:dwfedyk@nortel.com] >>>>> Sent: Wednesday, December 13, 2006 1:19 PM >>>>> To: Gray, Eric >>>>> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali >>>>> Sajassi (sajassi); Silvano Gai >>>>> Subject: RE: [rbridge] Use of 802.1ah Encaps >>>>> >>>>> Hi Eric >>>>> >>>>> >>>>> >>>>>> -----Original Message----- >>>>>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] >>>>>> >>>>>> Don, >>>>>> >>>>>> I don't follow your reasoning. >>>>>> >>>>>> >>>>> That's OK I cant follow you sometimes either ;-) >>>>> >>>>> >>>>> >>>>>> I certainly am not saying that using "ANY standard header" >>>>>> is a bad idea. >>>>>> >>>>>> >>>>> Then why not start from ah? The bit that Silvano said was we >>>>> could use ah and you said it is a bad idea. >>>>> >>>>> >>>> I don't think I am quoting too much out of context, when I quote >>>> the following from Silvano's reply to Joe Touch: >>>> >>>> SILVANO > My comment is that IEEE 802.1ah has no space for both >>>> SILVANO > the ultimate source/dest and the next hop source/dest. >>>> >>>> SILVANO > IEEE 802.1ah is designed for multiple enterprises to >>>> SILVANO > share a common metro backbone. It does a fine job in >>>> SILVANO > that area. It does not support well an arbitrary >>>> SILVANO > intermixing of Bridges and Rbridges. >>>> >>>> SILVANO > In contrast Trill does a fine job in supporting >>>> SILVANO > arbitrary topologies and mixing of RBridges and >>>> SILVANO > Bridges thanks to the availability of both the >>>> SILVANO > ultimate source/dest and the next hop source/dest. >>>> >>>> SILVANO > In TRILL the network between the "ingress" and >>>> SILVANO > "egress" RBridge isn't a single Ethernet (like in >>>> SILVANO > 802.1ah), but rather a sequence of RBridges that >>>> SILVANO > may be connected by Ethernets. >>>> >>>> SILVANO > Things look similar, but are substantially different. >>>> >>>> Given that this is what (I believe, at least) Silvano said >>>> about using 802.1ah, where do you get the impression that >>>> Silvano has said that "we could use ah"? >>>> >>>> >>>> >>>>> Please describe "BAD idea" then. >>>>> >>>>> >>>> In this, I think quite a few of us are now in agreement. >>>> >>>> It is rarely a good idea to use a header format just because >>>> most of the bits look similar to one proposal that has all >>>> of the information you require. >>>> >>>> Suppose you started to think that using 802.1ah - because it >>>> is similar to an abbreviated combination of (MAC+SHIM)-in-MAC >>>> - was an example of one of the rare instances in which this >>>> might be a good idea. Wouldn't you suspect that the need to >>>> consider potentially adding a TTL field to the header might >>>> be an indication that you are probably wrong? >>>> >>>> So, to answer your question, a "BAD idea" is one that takes >>>> valuable resources to explore and offers no believable cause >>>> to suspect that it will work better than other ideas already >>>> on the table. >>>> >>>> In this case, we have reason to believe (MAC+SHIM)-in-MAC >>>> will work and no reason to believe that 802.1ah will work >>>> better - even assuming we went down that rat-hole. >>>> >>>> >>>> >>>>>> As for "creating a new forwarding paradigm" - yes, we're >>>>>> doing a little bit of that. Ideally, we'll be doing as little >>>>>> of that as we can get away with. The "little bit" we have to >>>>>> do is to use some additional header information to: >>>>>> >>>>>> 1) forward frames on the shortest path between RBridges, >>>>>> and >>>>>> 2) reduce or eliminate potential looping of frames during >>>>>> a perturbation of the shortest path. >>>>>> >>>>>> >>>>> You have so far chosen to do this in a mode that >>>>> >> optimizes for mixed >> >>>>> bridges at the cost of ignoring the effciencies you could >>>>> >> get between >> >>>>> directly connected Rbridges. 802.1ah opimizes forwarding >>>>> >> for connected >> >>>>> Provider Backbone Bridges and interworks with legacy at a common >>>>> denominator. >>>>> >>>>> >>>> Right, and 802.1ah assumes either a green-field deployment, or a >>>> firmware modifiable deployment of PBB-(enabled/compatible) bridges. >>>> >>>> This is not consistent with our goals. >>>> >>>> >>>> >>>>>> This may be somewhat of a simplification, but that's fair in >>>>>> light of the general trend for casual observers to do the >>>>>> opposite. >>>>>> >>>>>> Currently, we define a SHIM to carry this information and >>>>>> we expect to use one or more "standard headers" to encapsulate >>>>>> frames being forwarded between RBridges. >>>>>> >>>>>> Does this make things clearer? >>>>>> >>>>>> >>>>> Eric I understand what is proposed but I still question >>>>> >> if a greater >> >>>>> synergy cannot be achieved between encapsulating headers. >>>>> >> A shim is a >> >>>>> not a typical solution but encapsulations are. >>>>> >>>>> >>>> Greater synergy is always demonstrably possible if you're willing >>>> to wait long enough. >>>> >>>> That's - for example - why we only have one link-state routing >>>> protocol, and why Ethernet was the one and only MAC-like format >>>> for L2 frames ever to have been used. >>>> >>>> What planet are we on? :-) >>>> >>>> >>>> >>>>> Regards, >>>>> Don >>>>> >>>>> >>>>> >>>>> >>>>>> -- >>>>>> Eric >>>>>> >>>>>> >>>>>> >>>>>>> -----Original Message----- >>>>>>> From: Don Fedyk [mailto:dwfedyk@nortel.com] >>>>>>> Sent: Wednesday, December 13, 2006 12:18 PM >>>>>>> To: Gray, Eric; Silvano Gai >>>>>>> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali >>>>>>> Sajassi (sajassi) >>>>>>> Subject: RE: [rbridge] Use of 802.1ah Encaps >>>>>>> >>>>>>> Hi Eric >>>>>>> >>>>>>> This argument says if you use ANY standard header then it >>>>>>> >>>>>>> >>>>>> would be a bad >>>>>> >>>>>> >>>>>>> idea. >>>>>>> >>>>>>> So you are creating a new forwarding paradigm and the down >>>>>>> >>>>>>> >>>>>> side of that >>>>>> >>>>>> >>>>>>> as Ali pointed out is now you have to create most of the >>>>>>> >>>>>>> >>>>>> other things >>>>>> >>>>>> >>>>>>> that go along with new forwarding paradigm. >>>>>>> >>>>>>> Don >>>>>>> >>>>>>> >>>>>>> >>>>>>>> -----Original Message----- >>>>>>>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] >>>>>>>> Sent: Tuesday, December 12, 2006 4:29 PM >>>>>>>> >>>>>>>> Silvano, >>>>>>>> >>>>>>>> IFF we were going to use 802.1ah, it could allow us to >>>>>>>> use the "back-bone" DA/SA for next-hop/previous-hop and the >>>>>>>> "customer" DA/SA for egress/ingress RBridges. But that would >>>>>>>> be using it in a way that is not consistent with the intended >>>>>>>> use of 802.1ah - simply because that usage would make use of >>>>>>>> the fields in a way that matches the way that your proposed >>>>>>>> "short-hand" SHIM header would use them. >>>>>>>> >>>>>>>> If you did that, there would be room for using the B-tag >>>>>>>> and I-tag as analogues of your I-VLAN and O-VLAN tags. >>>>>>>> >>>>>>>> I think this is a VERY BAD idea. >>>>>>>> >>>>>>>> -- >>>>>>>> Eric >>>>>>>> >>>>>>>> >>>>>>> <snip> >>>>>>> >>>>>>> >>>>>>> >>>> _______________________________________________ >>>> rbridge mailing list >>>> rbridge@postel.org >>>> http://mailman.postel.org/mailman/listinfo/rbridge >>>> >>>> >>> _______________________________________________ >>> rbridge mailing list >>> rbridge@postel.org >>> http://mailman.postel.org/mailman/listinfo/rbridge >>> >>> >> Received: from zcars04e.nortel.com (zcars04e.nortel.com [47.129.242.56]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBFHbrKr012131 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Fri, 15 Dec 2006 09:37:54 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zcars04e.nortel.com (Switch-2.2.0/Switch-2.2.0) with ESMTP id kBFHTsp20887; Fri, 15 Dec 2006 12:29:54 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Date: Fri, 15 Dec 2006 12:37:11 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C75D3E1@zrtphxm2.corp.nortel.com> In-Reply-To: <45828687.3050707@it.uc3m.es> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccgO/rxF4qxpgxlQaCuN5P6VO6C1wAF+u8g From: "Don Fedyk" <dwfedyk@nortel.com> To: =?iso-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBFHbrKr012131 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 15 Dec 2006 17:37:59 -0000 Status: RO Content-Length: 10609 Hi Guillermo See Inline. > -----Original Message----- > From: Guillermo Ib??ez [mailto:gibanez@it.uc3m.es] > > > My previous message perhaps was not too clear. Please bear > with me and > my english :-) > - 802.1ah assumes no legacy bridges in the middle. This is false. 802.1ah is backwards compatible with legacy bridges. However I think it would be safe to say this is not a plug and play option. 802.1ah would need to be configured to know the legacy bridges capabilities. But 802.1ah header is compatible with 802.1Q header for forwarding. The same trick that a TRILL RBridge uses. > - AFAK, 802.1ah does not assume routing between nodes. If so, > it would > likely require TTL field. 802.1ah bridges from ingress to egress PBB nodes. Whether the service is IP or Ethernet on the ingress/egress PBB is a box question not outside the scope of 802.1ah architecture. > - TRILL does assume legacy bridges between Rbridges > - TRILL is not a subset of 802.1ah, it is different thing I don't think people ever said TRILL was a subset of 802.1ah. What I said was certain versions of the TRILL header look remarkably like the 802.1ah header. Following this logic I then said start from 802.1ah. This has not yielded any results because the part that looks like 802.1ah is hop by hop part and 802.1ah does not have a hop by hop DA part. > - 802.1ah is not a example of simplicity. I don't think this type of generalization adds any value. We are talking headers and every field in 802.1ah has a purpose and good value for the bits. > - It is too late to question TRILL basic assumptions and try to merge > 802.1ah with TRILL encapsulation. If you asked me if I see value in merging right now I would say no since the point to point header is not mainstream TRILL. > - If the whole TRILL approach is questioned (I assume it is not the > case), 802.1ah does not seem the way to go regarding simplicity in > campus networks. No one suggested you put a provider backbone bridge in place of an Rbridge. The comment was could you use the same Frame format for the packet encaps and related functions? And that is not looking promising. Regards, Don > Guillermo > > Guillermo Ib??ez escribi?: > > Just a side comment. > > I think the ongoing discussion is not about encapsulation > but about the > > fundamentals of RBridges approach versus 802.1ah's. So, > while agreeing > > on the great sinergies of a common encapsulation, lack of > TTL is an > > essential point that reflects the essential difference in > the deployment > > fields assumed. > > If we assume a deployment field as for 802.1ah, encapsulations and > > proposals much simpler than 802.1ah are possible (one is > described in my > > ABridges draft). If this is the case we should restart WG > discussion > > from the beguinning. > > Encapsulation for RBridges is not simple, and 802.1ah isn't simple > > either, specially considering the campus networks of > moderate sizes that > > are the target for RBridges. > > Guillermo > > > > > > Gray, Eric escribi?: > >> Don, > >> > >> I think you've garbled the discussion, somewhat. > >> > >> Please see below... > >> > >> -- > >> Eric > >> > >> > >>> -----Original Message----- > >>> From: Don Fedyk [mailto:dwfedyk@nortel.com] > >>> Sent: Wednesday, December 13, 2006 1:19 PM > >>> To: Gray, Eric > >>> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > >>> Sajassi (sajassi); Silvano Gai > >>> Subject: RE: [rbridge] Use of 802.1ah Encaps > >>> > >>> Hi Eric > >>> > >>> > >>>> -----Original Message----- > >>>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] > >>>> > >>>> Don, > >>>> > >>>> I don't follow your reasoning. > >>>> > >>> That's OK I cant follow you sometimes either ;-) > >>> > >>> > >>>> I certainly am not saying that using "ANY standard header" > >>>> is a bad idea. > >>>> > >>> Then why not start from ah? The bit that Silvano said was we > >>> could use ah and you said it is a bad idea. > >>> > >> I don't think I am quoting too much out of context, when I quote > >> the following from Silvano's reply to Joe Touch: > >> > >> SILVANO > My comment is that IEEE 802.1ah has no space for both > >> SILVANO > the ultimate source/dest and the next hop source/dest. > >> > >> SILVANO > IEEE 802.1ah is designed for multiple enterprises to > >> SILVANO > share a common metro backbone. It does a fine job in > >> SILVANO > that area. It does not support well an arbitrary > >> SILVANO > intermixing of Bridges and Rbridges. > >> > >> SILVANO > In contrast Trill does a fine job in supporting > >> SILVANO > arbitrary topologies and mixing of RBridges and > >> SILVANO > Bridges thanks to the availability of both the > >> SILVANO > ultimate source/dest and the next hop source/dest. > >> > >> SILVANO > In TRILL the network between the "ingress" and > >> SILVANO > "egress" RBridge isn't a single Ethernet (like in > >> SILVANO > 802.1ah), but rather a sequence of RBridges that > >> SILVANO > may be connected by Ethernets. > >> > >> SILVANO > Things look similar, but are substantially different. > >> > >> Given that this is what (I believe, at least) Silvano said > >> about using 802.1ah, where do you get the impression that > >> Silvano has said that "we could use ah"? > >> > >> > >>> Please describe "BAD idea" then. > >>> > >> In this, I think quite a few of us are now in agreement. > >> > >> It is rarely a good idea to use a header format just because > >> most of the bits look similar to one proposal that has all > >> of the information you require. > >> > >> Suppose you started to think that using 802.1ah - because it > >> is similar to an abbreviated combination of (MAC+SHIM)-in-MAC > >> - was an example of one of the rare instances in which this > >> might be a good idea. Wouldn't you suspect that the need to > >> consider potentially adding a TTL field to the header might > >> be an indication that you are probably wrong? > >> > >> So, to answer your question, a "BAD idea" is one that takes > >> valuable resources to explore and offers no believable cause > >> to suspect that it will work better than other ideas already > >> on the table. > >> > >> In this case, we have reason to believe (MAC+SHIM)-in-MAC > >> will work and no reason to believe that 802.1ah will work > >> better - even assuming we went down that rat-hole. > >> > >> > >>>> As for "creating a new forwarding paradigm" - yes, we're > >>>> doing a little bit of that. Ideally, we'll be doing as little > >>>> of that as we can get away with. The "little bit" we have to > >>>> do is to use some additional header information to: > >>>> > >>>> 1) forward frames on the shortest path between RBridges, > >>>> and > >>>> 2) reduce or eliminate potential looping of frames during > >>>> a perturbation of the shortest path. > >>>> > >>> You have so far chosen to do this in a mode that > optimizes for mixed > >>> bridges at the cost of ignoring the effciencies you could > get between > >>> directly connected Rbridges. 802.1ah opimizes forwarding > for connected > >>> Provider Backbone Bridges and interworks with legacy at a common > >>> denominator. > >>> > >> Right, and 802.1ah assumes either a green-field deployment, or a > >> firmware modifiable deployment of PBB-(enabled/compatible) bridges. > >> > >> This is not consistent with our goals. > >> > >> > >>>> This may be somewhat of a simplification, but that's fair in > >>>> light of the general trend for casual observers to do the > >>>> opposite. > >>>> > >>>> Currently, we define a SHIM to carry this information and > >>>> we expect to use one or more "standard headers" to encapsulate > >>>> frames being forwarded between RBridges. > >>>> > >>>> Does this make things clearer? > >>>> > >>> Eric I understand what is proposed but I still question > if a greater > >>> synergy cannot be achieved between encapsulating headers. > A shim is a > >>> not a typical solution but encapsulations are. > >>> > >> Greater synergy is always demonstrably possible if you're willing > >> to wait long enough. > >> > >> That's - for example - why we only have one link-state routing > >> protocol, and why Ethernet was the one and only MAC-like format > >> for L2 frames ever to have been used. > >> > >> What planet are we on? :-) > >> > >> > >>> Regards, > >>> Don > >>> > >>> > >>> > >>>> -- > >>>> Eric > >>>> > >>>> > >>>>> -----Original Message----- > >>>>> From: Don Fedyk [mailto:dwfedyk@nortel.com] > >>>>> Sent: Wednesday, December 13, 2006 12:18 PM > >>>>> To: Gray, Eric; Silvano Gai > >>>>> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > >>>>> Sajassi (sajassi) > >>>>> Subject: RE: [rbridge] Use of 802.1ah Encaps > >>>>> > >>>>> Hi Eric > >>>>> > >>>>> This argument says if you use ANY standard header then it > >>>>> > >>>> would be a bad > >>>> > >>>>> idea. > >>>>> > >>>>> So you are creating a new forwarding paradigm and the down > >>>>> > >>>> side of that > >>>> > >>>>> as Ali pointed out is now you have to create most of the > >>>>> > >>>> other things > >>>> > >>>>> that go along with new forwarding paradigm. > >>>>> > >>>>> Don > >>>>> > >>>>> > >>>>>> -----Original Message----- > >>>>>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] > >>>>>> Sent: Tuesday, December 12, 2006 4:29 PM > >>>>>> > >>>>>> Silvano, > >>>>>> > >>>>>> IFF we were going to use 802.1ah, it could allow us to > >>>>>> use the "back-bone" DA/SA for next-hop/previous-hop and the > >>>>>> "customer" DA/SA for egress/ingress RBridges. But that would > >>>>>> be using it in a way that is not consistent with the intended > >>>>>> use of 802.1ah - simply because that usage would make use of > >>>>>> the fields in a way that matches the way that your proposed > >>>>>> "short-hand" SHIM header would use them. > >>>>>> > >>>>>> If you did that, there would be room for using the B-tag > >>>>>> and I-tag as analogues of your I-VLAN and O-VLAN tags. > >>>>>> > >>>>>> I think this is a VERY BAD idea. > >>>>>> > >>>>>> -- > >>>>>> Eric > >>>>>> > >>>>> <snip> > >>>>> > >>>>> > >> _______________________________________________ > >> rbridge mailing list > >> rbridge@postel.org > >> http://mailman.postel.org/mailman/listinfo/rbridge > >> > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBFGtAmS025193 for <rbridge@postel.org>; Fri, 15 Dec 2006 08:55:11 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBFGswfd004198; Fri, 15 Dec 2006 11:54:58 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id LAA12853; Fri, 15 Dec 2006 11:54:56 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0W6A5>; Fri, 15 Dec 2006 11:54:57 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D8125010E01E2@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com> Date: Fri, 15 Dec 2006 11:54:56 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Breaking up of Spanning Trees - (Was Use of 802.1ah Encaps) X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 15 Dec 2006 16:56:44 -0000 Status: RO Content-Length: 5751 Don, We (the TRILL working group) are not completely decided on this, and how we can make it work in the face of other things we also have to make work. Yes, we want to break up the spanning trees, but we also are being asked to address certain issues that arise as a result of doing so. In particular, there is a "wiring closet" problem that we have been assured is one we MUST solve. The (currently?) leading proposal for how to deal with that is to have (some?) RBridges participate in spanning tree protocol in such a way as to cause "wiring closet" bridges to see (at least part of) the RBridge "CRED" as a single bridge (with that bridge set up to be the root bridge). I am pretty sure (at this point) that this will be a configurable option which will not be "on" by default. I think the reasoning for this is that it would be okay to have a configuration requirement that would only require configuration if it is necessary to solve this problem - hence it remains possible to have a plug-and-play solution. However, this particular problem points out a potential "general class" of problems relating to breaking up spanning trees. And we do not currently have a "correctness proof" - or even a good try at one - that might lead us to believe that we do not have further issues to address, except by turning this "breaking up" feature off. For example, one model for RBridge interactions - that has been considered from very early on - is one where a "CRED" appears to existing 802.<whatever> bridges as a single bridge. This model does not suffer from the above "general class" of problems, because it does not actually break up the spanning trees. All of the fractional LANs separated by RBridges will see each other in spanning tree protocol if this model is used. As a direct consequence, it may turn out that we will be required to support - at least as a configurable option - that RBridges do not break up spanning trees. I believe there is a lot of work that needs to be done if this is the case... -- Eric (part of your earlier message included the following) > > But as Ali pointed out 802.1ah is backwards compatible with > everything. On goals one goal of RBridge was to improve > spanning tree by breaking up a large spanning tree with > Rbridges providing interconnection of these smaller trees. > A certain amount of insertion of Rbridges on shortest paths > is required before this goal is realizable. I agree large > provider networks are not your goal. And perhaps you are > right that this justifies different technology but Ethernet > did not get to high scale [commoditization] by changing the > forwarding paradigm. > > > > > > > > > > > > > This may be somewhat of a simplification, but that's fair in > > > > light of the general trend for casual observers to do the > > > > opposite. > > > > > > > > Currently, we define a SHIM to carry this > information and > > > > we expect to use one or more "standard headers" to encapsulate > > > > frames being forwarded between RBridges. > > > > > > > > Does this make things clearer? > > > > > > Eric I understand what is proposed but I still question > if a greater > > > synergy cannot be achieved between encapsulating headers. > > A shim is a > > > not a typical solution but encapsulations are. > > > > Greater synergy is always demonstrably possible if you're willing > > to wait long enough. > > > > That's - for example - why we only have one link-state routing > > protocol, and why Ethernet was the one and only MAC-like format > > for L2 frames ever to have been used. > > > > What planet are we on? :-) > As an engineer I have to ask the question. "Is this the best > we can do?" > So even though history has proven that multiple implementations often > result the question has to be asked never the less. > > Regards, > Don > > > > > > > > > > Regards, > > > Don > > > > > > > > > > > > > > -- > > > > Eric > > > > > > > > > -----Original Message----- > > > > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > > > > Sent: Wednesday, December 13, 2006 12:18 PM > > > > > To: Gray, Eric; Silvano Gai > > > > > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > > > > > Sajassi (sajassi) > > > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > > > > > Hi Eric > > > > > > > > > > This argument says if you use ANY standard header then it > > > > would be a bad > > > > > idea. > > > > > > > > > > So you are creating a new forwarding paradigm and the down > > > > side of that > > > > > as Ali pointed out is now you have to create most of the > > > > other things > > > > > that go along with new forwarding paradigm. > > > > > > > > > > Don > > > > > > > > > > > -----Original Message----- > > > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > Sent: Tuesday, December 12, 2006 4:29 PM > > > > > > > > > > > > Silvano, > > > > > > > > > > > > IFF we were going to use 802.1ah, it could allow us to > > > > > > use the "back-bone" DA/SA for next-hop/previous-hop and the > > > > > > "customer" DA/SA for egress/ingress RBridges. But > that would > > > > > > be using it in a way that is not consistent with > the intended > > > > > > use of 802.1ah - simply because that usage would > make use of > > > > > > the fields in a way that matches the way that your proposed > > > > > > "short-hand" SHIM header would use them. > > > > > > > > > > > > If you did that, there would be room for using the B-tag > > > > > > and I-tag as analogues of your I-VLAN and O-VLAN tags. > > > > > > > > > > > > I think this is a VERY BAD idea. > > > > > > > > > > > > -- > > > > > > Eric > > > > > <snip> > > > > > > > > > > > > > > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBFGtAru025192 for <rbridge@postel.org>; Fri, 15 Dec 2006 08:55:10 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBFGt1fd004201; Fri, 15 Dec 2006 11:55:01 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id LAA12857; Fri, 15 Dec 2006 11:54:59 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0W6A6>; Fri, 15 Dec 2006 11:55:00 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D8125010E01E3@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com> Date: Fri, 15 Dec 2006 11:54:59 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Synergy - (Was Use of 802.1ah Encaps) X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 15 Dec 2006 16:56:43 -0000 Status: RO Content-Length: 768 Don, For good or bad, we don't live in a world ruled by engineering goals. It is arguable that - if we did - we would _almost_ have perfected the wheel by now... :-) -- Eric (part of our earlier dialogue is included below I said: > > Greater synergy is always demonstrably possible if you're willing > > to wait long enough. > > > > That's - for example - why we only have one link-state routing > > protocol, and why Ethernet was the one and only MAC-like format > > for L2 frames ever to have been used. > > > > What planet are we on? :-) You said: > As an engineer I have to ask the question. "Is this the best we can do?" > So even though history has proven that multiple implementations often > result the question has to be asked never the less. > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBFGsnIL025082 for <rbridge@postel.org>; Fri, 15 Dec 2006 08:54:49 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBFGsWfd004187; Fri, 15 Dec 2006 11:54:32 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id LAA12829; Fri, 15 Dec 2006 11:54:29 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0W6A4>; Fri, 15 Dec 2006 11:54:30 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D8125010E01E0@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com> Date: Fri, 15 Dec 2006 11:54:29 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 15 Dec 2006 16:55:07 -0000 Status: RO Content-Length: 9202 Don, I will reply to your points in separate threads: - TTL Use - Breaking up Spanning Trees - Synergy > -----Original Message----- > From: Don Fedyk [mailto:dwfedyk@nortel.com] > Sent: Thursday, December 14, 2006 10:48 AM > To: Gray, Eric > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > Sajassi (sajassi); Silvano Gai > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Hi Eric > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > Don, > > > > I think you've garbled the discussion, somewhat. > > > > Please see below... > I'll answer inline here specifically. Thanks for providing > more context. > > > > > -- > > Eric > > > > > -----Original Message----- > > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > > Sent: Wednesday, December 13, 2006 1:19 PM > > > To: Gray, Eric > > > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > > > Sajassi (sajassi); Silvano Gai > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > Hi Eric > > > > > > > -----Original Message----- > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > > > Don, > > > > > > > > I don't follow your reasoning. > > > That's OK I cant follow you sometimes either ;-) > > > > > > > > > > > I certainly am not saying that using "ANY > standard header" > > > > is a bad idea. > > > Then why not start from ah? The bit that Silvano said was we > > > could use ah and you said it is a bad idea. > > > > I don't think I am quoting too much out of context, when I quote > > the following from Silvano's reply to Joe Touch: > > > > SILVANO > My comment is that IEEE 802.1ah has no space for both > > SILVANO > the ultimate source/dest and the next hop source/dest. > > > > SILVANO > IEEE 802.1ah is designed for multiple enterprises to > > SILVANO > share a common metro backbone. It does a fine job in > > SILVANO > that area. It does not support well an arbitrary > > SILVANO > intermixing of Bridges and Rbridges. > > > > SILVANO > In contrast Trill does a fine job in supporting > > SILVANO > arbitrary topologies and mixing of RBridges and > > SILVANO > Bridges thanks to the availability of both the > > SILVANO > ultimate source/dest and the next hop source/dest. > > > > SILVANO > In TRILL the network between the "ingress" and > > SILVANO > "egress" RBridge isn't a single Ethernet (like in > > SILVANO > 802.1ah), but rather a sequence of RBridges that > > SILVANO > may be connected by Ethernets. > > > > SILVANO > Things look similar, but are substantially different. > > > > Given that this is what (I believe, at least) Silvano said > > about using 802.1ah, where do you get the impression that > > Silvano has said that "we could use ah"? > > > > > > > > Please describe "BAD idea" then. > > > > In this, I think quite a few of us are now in agreement. > > > > It is rarely a good idea to use a header format just because > > most of the bits look similar to one proposal that has all > > of the information you require. > > I agree. Bits on the wire looking just like other bits on the wire > having different context are not good. > > > > > Suppose you started to think that using 802.1ah - because it > > is similar to an abbreviated combination of (MAC+SHIM)-in-MAC > > - was an example of one of the rare instances in which this > > might be a good idea. Wouldn't you suspect that the need to > > consider potentially adding a TTL field to the header might > > be an indication that you are probably wrong? > > Ahh this is what you mean. TTL is one method for a number of things, > Loop mitigation, tracing, fault monitoring etc. It has pluses and > minuses. Personally speaking as an individual I like TTL. > Although I am > also aware of many systems and I also built systems that are > operational > without TTL. TTL has shortcommings as well even in IP. It is > not a bad > tool for some applications. I know this group values it, I'm not > suggesting you drop that goal or requirement. But a > requiremetn for TTL > alone does not mandate a licence to change everything either IMHO. > > > > > So, to answer your question, a "BAD idea" is one that takes > > valuable resources to explore and offers no believable cause > > to suspect that it will work better than other ideas already > > on the table. > > > > In this case, we have reason to believe (MAC+SHIM)-in-MAC > > will work and no reason to believe that 802.1ah will work > > better - even assuming we went down that rat-hole. > > > > > > > > > > > > > As for "creating a new forwarding paradigm" - yes, we're > > > > doing a little bit of that. Ideally, we'll be doing as little > > > > of that as we can get away with. The "little bit" we have to > > > > do is to use some additional header information to: > > > > > > > > 1) forward frames on the shortest path between RBridges, > > > > and > > > > 2) reduce or eliminate potential looping of > frames during > > > > a perturbation of the shortest path. > > > > > > You have so far chosen to do this in a mode that > optimizes for mixed > > > bridges at the cost of ignoring the effciencies you could > > get between > > > directly connected Rbridges. 802.1ah opimizes forwarding > > for connected > > > Provider Backbone Bridges and interworks with legacy at a common > > > denominator. > > > > Right, and 802.1ah assumes either a green-field deployment, or a > > firmware modifiable deployment of PBB-(enabled/compatible) bridges. > > > > This is not consistent with our goals. > > But as Ali pointed out 802.1ah is backwards compatible with > everything. > On goals one goal of RBridge was to improve spanning tree by > breaking up > a large spanning tree with Rbridges providing interconnection of these > smaller trees. A certain amount of insertion of Rbridges on shortest > paths is required before this goal is realizable. I agree large > provider networks are not your goal. And perhaps you are > right that this > justifies different technology but Ethernet did not get to high scale > comodization by changing the forwarding paradigm. > > > > > > > > > > > > > This may be somewhat of a simplification, but that's fair in > > > > light of the general trend for casual observers to do the > > > > opposite. > > > > > > > > Currently, we define a SHIM to carry this > information and > > > > we expect to use one or more "standard headers" to encapsulate > > > > frames being forwarded between RBridges. > > > > > > > > Does this make things clearer? > > > > > > Eric I understand what is proposed but I still question > if a greater > > > synergy cannot be achieved between encapsulating headers. > > A shim is a > > > not a typical solution but encapsulations are. > > > > Greater synergy is always demonstrably possible if you're willing > > to wait long enough. > > > > That's - for example - why we only have one link-state routing > > protocol, and why Ethernet was the one and only MAC-like format > > for L2 frames ever to have been used. > > > > What planet are we on? :-) > As an engineer I have to ask the question. "Is this the best > we can do?" > So even though history has proven that multiple implementations often > result the question has to be asked never the less. > > Regards, > Don > > > > > > > > > > Regards, > > > Don > > > > > > > > > > > > > > -- > > > > Eric > > > > > > > > > -----Original Message----- > > > > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > > > > Sent: Wednesday, December 13, 2006 12:18 PM > > > > > To: Gray, Eric; Silvano Gai > > > > > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > > > > > Sajassi (sajassi) > > > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > > > > > Hi Eric > > > > > > > > > > This argument says if you use ANY standard header then it > > > > would be a bad > > > > > idea. > > > > > > > > > > So you are creating a new forwarding paradigm and the down > > > > side of that > > > > > as Ali pointed out is now you have to create most of the > > > > other things > > > > > that go along with new forwarding paradigm. > > > > > > > > > > Don > > > > > > > > > > > -----Original Message----- > > > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > Sent: Tuesday, December 12, 2006 4:29 PM > > > > > > > > > > > > Silvano, > > > > > > > > > > > > IFF we were going to use 802.1ah, it could allow us to > > > > > > use the "back-bone" DA/SA for next-hop/previous-hop and the > > > > > > "customer" DA/SA for egress/ingress RBridges. But > that would > > > > > > be using it in a way that is not consistent with > the intended > > > > > > use of 802.1ah - simply because that usage would > make use of > > > > > > the fields in a way that matches the way that your proposed > > > > > > "short-hand" SHIM header would use them. > > > > > > > > > > > > If you did that, there would be room for using the B-tag > > > > > > and I-tag as analogues of your I-VLAN and O-VLAN tags. > > > > > > > > > > > > I think this is a VERY BAD idea. > > > > > > > > > > > > -- > > > > > > Eric > > > > > <snip> > > > > > > > > > > > > > > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBFGst7P025101 for <rbridge@postel.org>; Fri, 15 Dec 2006 08:54:55 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBFGsmfd004192; Fri, 15 Dec 2006 11:54:48 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id LAA12840; Fri, 15 Dec 2006 11:54:46 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0W6AY>; Fri, 15 Dec 2006 11:54:47 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D8125010E01E1@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com> Date: Fri, 15 Dec 2006 11:54:45 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] TTL use - (was Use of 802.1ah Encaps) X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 15 Dec 2006 16:55:03 -0000 Status: RO Content-Length: 1632 Don, I believe the key reason why we've more or less locked on to using TTL for loop mitigation of (at least) unicast frame forwarding is that the formation of temporary loops is hard to avoid using existing link state routing protocols. We've agreed - at least in principle - to adopt whatever comes out of the routing working group's efforts to avoid loop formation (micro- loop formation in particular), but this does not appear to rid us of that problem. Yes, other loop mitigation techniques have been discussed previously but TTL is the one with which most of us have more experience. There are also loop-prevention techniques such as may be achieved using STP and/or one of various signaling approaches. At present, we are not - on the whole - considering any of these approaches for work by the TRILL working group. Most exist now but would require (potentially major) modification, or are in progress elsewhere (for other - possibly incompatible - purposes). -- Eric (part of your previous message is included below) > > Ahh this is what you mean. TTL is one method for a number of things, > Loop mitigation, tracing, fault monitoring etc. It has pluses and > minuses. Personally speaking as an individual I like TTL. Although > I am > also aware of many systems and I also built systems that are > operational without TTL. TTL has shortcommings as well even in IP. > It is not a bad tool for some applications. I know this group values > it, I'm not suggesting you drop that goal or requirement. But a > [requirement] for TTL alone does not mandate a licence to change > everything either IMHO. > Received: from smtp02.uc3m.es (smtp02.uc3m.es [163.117.136.122]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBFBRDqO019106 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Fri, 15 Dec 2006 03:27:14 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by localhost.uc3m.es (Postfix) with SMTP id 44DCDCB013; Fri, 15 Dec 2006 12:27:12 +0100 (CET) Received: from [163.117.55.85] (unknown [163.117.55.85]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp02.uc3m.es (Postfix) with ESMTP id 30419CB04D; Fri, 15 Dec 2006 12:27:02 +0100 (CET) Message-ID: <45828687.3050707@it.uc3m.es> Date: Fri, 15 Dec 2006 12:27:03 +0100 From: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> References: <0BF76B30C100624BA997C9CED19D812501017CE3@uspitsmsgusr08.win.marconi.com> <4580F055.2010800@it.uc3m.es> In-Reply-To: <4580F055.2010800@it.uc3m.es> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gibanez@it.uc3m.es Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 15 Dec 2006 11:27:27 -0000 Status: RO Content-Length: 8581 My previous message perhaps was not too clear. Please bear with me and my english :-) - 802.1ah assumes no legacy bridges in the middle. - AFAK, 802.1ah does not assume routing between nodes. If so, it would likely require TTL field. - TRILL does assume legacy bridges between RBridges - TRILL is not a subset of 802.1ah, it is different thing - 802.1ah is not a example of simplicity. - It is too late to question TRILL basic assumptions and try to merge 802.1ah with TRILL encapsulation. - If the whole TRILL approach is questioned (I assume it is not the case), 802.1ah does not seem the way to go regarding simplicity in campus networks. Guillermo Guillermo Ib??ez escribi?: > Just a side comment. > I think the ongoing discussion is not about encapsulation but about the > fundamentals of RBridges approach versus 802.1ah's. So, while agreeing > on the great sinergies of a common encapsulation, lack of TTL is an > essential point that reflects the essential difference in the deployment > fields assumed. > If we assume a deployment field as for 802.1ah, encapsulations and > proposals much simpler than 802.1ah are possible (one is described in my > ABridges draft). If this is the case we should restart WG discussion > from the beguinning. > Encapsulation for RBridges is not simple, and 802.1ah isn't simple > either, specially considering the campus networks of moderate sizes that > are the target for RBridges. > Guillermo > > > Gray, Eric escribi?: >> Don, >> >> I think you've garbled the discussion, somewhat. >> >> Please see below... >> >> -- >> Eric >> >> >>> -----Original Message----- >>> From: Don Fedyk [mailto:dwfedyk@nortel.com] >>> Sent: Wednesday, December 13, 2006 1:19 PM >>> To: Gray, Eric >>> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali >>> Sajassi (sajassi); Silvano Gai >>> Subject: RE: [rbridge] Use of 802.1ah Encaps >>> >>> Hi Eric >>> >>> >>>> -----Original Message----- >>>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] >>>> >>>> Don, >>>> >>>> I don't follow your reasoning. >>>> >>> That's OK I cant follow you sometimes either ;-) >>> >>> >>>> I certainly am not saying that using "ANY standard header" >>>> is a bad idea. >>>> >>> Then why not start from ah? The bit that Silvano said was we >>> could use ah and you said it is a bad idea. >>> >> I don't think I am quoting too much out of context, when I quote >> the following from Silvano's reply to Joe Touch: >> >> SILVANO > My comment is that IEEE 802.1ah has no space for both >> SILVANO > the ultimate source/dest and the next hop source/dest. >> >> SILVANO > IEEE 802.1ah is designed for multiple enterprises to >> SILVANO > share a common metro backbone. It does a fine job in >> SILVANO > that area. It does not support well an arbitrary >> SILVANO > intermixing of Bridges and Rbridges. >> >> SILVANO > In contrast Trill does a fine job in supporting >> SILVANO > arbitrary topologies and mixing of RBridges and >> SILVANO > Bridges thanks to the availability of both the >> SILVANO > ultimate source/dest and the next hop source/dest. >> >> SILVANO > In TRILL the network between the "ingress" and >> SILVANO > "egress" RBridge isn't a single Ethernet (like in >> SILVANO > 802.1ah), but rather a sequence of RBridges that >> SILVANO > may be connected by Ethernets. >> >> SILVANO > Things look similar, but are substantially different. >> >> Given that this is what (I believe, at least) Silvano said >> about using 802.1ah, where do you get the impression that >> Silvano has said that "we could use ah"? >> >> >>> Please describe "BAD idea" then. >>> >> In this, I think quite a few of us are now in agreement. >> >> It is rarely a good idea to use a header format just because >> most of the bits look similar to one proposal that has all >> of the information you require. >> >> Suppose you started to think that using 802.1ah - because it >> is similar to an abbreviated combination of (MAC+SHIM)-in-MAC >> - was an example of one of the rare instances in which this >> might be a good idea. Wouldn't you suspect that the need to >> consider potentially adding a TTL field to the header might >> be an indication that you are probably wrong? >> >> So, to answer your question, a "BAD idea" is one that takes >> valuable resources to explore and offers no believable cause >> to suspect that it will work better than other ideas already >> on the table. >> >> In this case, we have reason to believe (MAC+SHIM)-in-MAC >> will work and no reason to believe that 802.1ah will work >> better - even assuming we went down that rat-hole. >> >> >>>> As for "creating a new forwarding paradigm" - yes, we're >>>> doing a little bit of that. Ideally, we'll be doing as little >>>> of that as we can get away with. The "little bit" we have to >>>> do is to use some additional header information to: >>>> >>>> 1) forward frames on the shortest path between RBridges, >>>> and >>>> 2) reduce or eliminate potential looping of frames during >>>> a perturbation of the shortest path. >>>> >>> You have so far chosen to do this in a mode that optimizes for mixed >>> bridges at the cost of ignoring the effciencies you could get between >>> directly connected Rbridges. 802.1ah opimizes forwarding for connected >>> Provider Backbone Bridges and interworks with legacy at a common >>> denominator. >>> >> Right, and 802.1ah assumes either a green-field deployment, or a >> firmware modifiable deployment of PBB-(enabled/compatible) bridges. >> >> This is not consistent with our goals. >> >> >>>> This may be somewhat of a simplification, but that's fair in >>>> light of the general trend for casual observers to do the >>>> opposite. >>>> >>>> Currently, we define a SHIM to carry this information and >>>> we expect to use one or more "standard headers" to encapsulate >>>> frames being forwarded between RBridges. >>>> >>>> Does this make things clearer? >>>> >>> Eric I understand what is proposed but I still question if a greater >>> synergy cannot be achieved between encapsulating headers. A shim is a >>> not a typical solution but encapsulations are. >>> >> Greater synergy is always demonstrably possible if you're willing >> to wait long enough. >> >> That's - for example - why we only have one link-state routing >> protocol, and why Ethernet was the one and only MAC-like format >> for L2 frames ever to have been used. >> >> What planet are we on? :-) >> >> >>> Regards, >>> Don >>> >>> >>> >>>> -- >>>> Eric >>>> >>>> >>>>> -----Original Message----- >>>>> From: Don Fedyk [mailto:dwfedyk@nortel.com] >>>>> Sent: Wednesday, December 13, 2006 12:18 PM >>>>> To: Gray, Eric; Silvano Gai >>>>> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali >>>>> Sajassi (sajassi) >>>>> Subject: RE: [rbridge] Use of 802.1ah Encaps >>>>> >>>>> Hi Eric >>>>> >>>>> This argument says if you use ANY standard header then it >>>>> >>>> would be a bad >>>> >>>>> idea. >>>>> >>>>> So you are creating a new forwarding paradigm and the down >>>>> >>>> side of that >>>> >>>>> as Ali pointed out is now you have to create most of the >>>>> >>>> other things >>>> >>>>> that go along with new forwarding paradigm. >>>>> >>>>> Don >>>>> >>>>> >>>>>> -----Original Message----- >>>>>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] >>>>>> Sent: Tuesday, December 12, 2006 4:29 PM >>>>>> >>>>>> Silvano, >>>>>> >>>>>> IFF we were going to use 802.1ah, it could allow us to >>>>>> use the "back-bone" DA/SA for next-hop/previous-hop and the >>>>>> "customer" DA/SA for egress/ingress RBridges. But that would >>>>>> be using it in a way that is not consistent with the intended >>>>>> use of 802.1ah - simply because that usage would make use of >>>>>> the fields in a way that matches the way that your proposed >>>>>> "short-hand" SHIM header would use them. >>>>>> >>>>>> If you did that, there would be room for using the B-tag >>>>>> and I-tag as analogues of your I-VLAN and O-VLAN tags. >>>>>> >>>>>> I think this is a VERY BAD idea. >>>>>> >>>>>> -- >>>>>> Eric >>>>>> >>>>> <snip> >>>>> >>>>> >> _______________________________________________ >> rbridge mailing list >> rbridge@postel.org >> http://mailman.postel.org/mailman/listinfo/rbridge >> > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from zcars04f.nortel.com (zcars04f.nortel.com [47.129.242.57]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBEFmCUm024140 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Thu, 14 Dec 2006 07:48:13 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zcars04f.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id kBEFltS25020; Thu, 14 Dec 2006 10:47:55 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 14 Dec 2006 10:47:53 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C70CE79@zrtphxm2.corp.nortel.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501017CE3@uspitsmsgusr08.win.marconi.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccfEu4iBPbdDBh7Sqmd1LFxDzFbkwAf8Wsw From: "Don Fedyk" <dwfedyk@nortel.com> To: "Gray, Eric" <Eric.Gray@marconi.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBEFmCUm024140 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 14 Dec 2006 15:48:27 -0000 Status: RO Content-Length: 8300 Hi Eric > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Don, > > I think you've garbled the discussion, somewhat. > > Please see below... I'll answer inline here specifically. Thanks for providing more context. > > -- > Eric > > > -----Original Message----- > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > Sent: Wednesday, December 13, 2006 1:19 PM > > To: Gray, Eric > > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > > Sajassi (sajassi); Silvano Gai > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Hi Eric > > > > > -----Original Message----- > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > Don, > > > > > > I don't follow your reasoning. > > That's OK I cant follow you sometimes either ;-) > > > > > > > > I certainly am not saying that using "ANY standard header" > > > is a bad idea. > > Then why not start from ah? The bit that Silvano said was we > > could use ah and you said it is a bad idea. > > I don't think I am quoting too much out of context, when I quote > the following from Silvano's reply to Joe Touch: > > SILVANO > My comment is that IEEE 802.1ah has no space for both > SILVANO > the ultimate source/dest and the next hop source/dest. > > SILVANO > IEEE 802.1ah is designed for multiple enterprises to > SILVANO > share a common metro backbone. It does a fine job in > SILVANO > that area. It does not support well an arbitrary > SILVANO > intermixing of Bridges and Rbridges. > > SILVANO > In contrast Trill does a fine job in supporting > SILVANO > arbitrary topologies and mixing of RBridges and > SILVANO > Bridges thanks to the availability of both the > SILVANO > ultimate source/dest and the next hop source/dest. > > SILVANO > In TRILL the network between the "ingress" and > SILVANO > "egress" RBridge isn't a single Ethernet (like in > SILVANO > 802.1ah), but rather a sequence of RBridges that > SILVANO > may be connected by Ethernets. > > SILVANO > Things look similar, but are substantially different. > > Given that this is what (I believe, at least) Silvano said > about using 802.1ah, where do you get the impression that > Silvano has said that "we could use ah"? > > > > > Please describe "BAD idea" then. > > In this, I think quite a few of us are now in agreement. > > It is rarely a good idea to use a header format just because > most of the bits look similar to one proposal that has all > of the information you require. I agree. Bits on the wire looking just like other bits on the wire having different context are not good. > > Suppose you started to think that using 802.1ah - because it > is similar to an abbreviated combination of (MAC+SHIM)-in-MAC > - was an example of one of the rare instances in which this > might be a good idea. Wouldn't you suspect that the need to > consider potentially adding a TTL field to the header might > be an indication that you are probably wrong? Ahh this is what you mean. TTL is one method for a number of things, Loop mitigation, tracing, fault monitoring etc. It has pluses and minuses. Personally speaking as an individual I like TTL. Although I am also aware of many systems and I also built systems that are operational without TTL. TTL has shortcommings as well even in IP. It is not a bad tool for some applications. I know this group values it, I'm not suggesting you drop that goal or requirement. But a requiremetn for TTL alone does not mandate a licence to change everything either IMHO. > > So, to answer your question, a "BAD idea" is one that takes > valuable resources to explore and offers no believable cause > to suspect that it will work better than other ideas already > on the table. > > In this case, we have reason to believe (MAC+SHIM)-in-MAC > will work and no reason to believe that 802.1ah will work > better - even assuming we went down that rat-hole. > > > > > > > > > As for "creating a new forwarding paradigm" - yes, we're > > > doing a little bit of that. Ideally, we'll be doing as little > > > of that as we can get away with. The "little bit" we have to > > > do is to use some additional header information to: > > > > > > 1) forward frames on the shortest path between RBridges, > > > and > > > 2) reduce or eliminate potential looping of frames during > > > a perturbation of the shortest path. > > > > You have so far chosen to do this in a mode that optimizes for mixed > > bridges at the cost of ignoring the effciencies you could > get between > > directly connected Rbridges. 802.1ah opimizes forwarding > for connected > > Provider Backbone Bridges and interworks with legacy at a common > > denominator. > > Right, and 802.1ah assumes either a green-field deployment, or a > firmware modifiable deployment of PBB-(enabled/compatible) bridges. > > This is not consistent with our goals. But as Ali pointed out 802.1ah is backwards compatible with everything. On goals one goal of RBridge was to improve spanning tree by breaking up a large spanning tree with Rbridges providing interconnection of these smaller trees. A certain amount of insertion of Rbridges on shortest paths is required before this goal is realizable. I agree large provider networks are not your goal. And perhaps you are right that this justifies different technology but Ethernet did not get to high scale comodization by changing the forwarding paradigm. > > > > > > > > > This may be somewhat of a simplification, but that's fair in > > > light of the general trend for casual observers to do the > > > opposite. > > > > > > Currently, we define a SHIM to carry this information and > > > we expect to use one or more "standard headers" to encapsulate > > > frames being forwarded between RBridges. > > > > > > Does this make things clearer? > > > > Eric I understand what is proposed but I still question if a greater > > synergy cannot be achieved between encapsulating headers. > A shim is a > > not a typical solution but encapsulations are. > > Greater synergy is always demonstrably possible if you're willing > to wait long enough. > > That's - for example - why we only have one link-state routing > protocol, and why Ethernet was the one and only MAC-like format > for L2 frames ever to have been used. > > What planet are we on? :-) As an engineer I have to ask the question. "Is this the best we can do?" So even though history has proven that multiple implementations often result the question has to be asked never the less. Regards, Don > > > > > Regards, > > Don > > > > > > > > > > -- > > > Eric > > > > > > > -----Original Message----- > > > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > > > Sent: Wednesday, December 13, 2006 12:18 PM > > > > To: Gray, Eric; Silvano Gai > > > > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > > > > Sajassi (sajassi) > > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > > > Hi Eric > > > > > > > > This argument says if you use ANY standard header then it > > > would be a bad > > > > idea. > > > > > > > > So you are creating a new forwarding paradigm and the down > > > side of that > > > > as Ali pointed out is now you have to create most of the > > > other things > > > > that go along with new forwarding paradigm. > > > > > > > > Don > > > > > > > > > -----Original Message----- > > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > Sent: Tuesday, December 12, 2006 4:29 PM > > > > > > > > > > Silvano, > > > > > > > > > > IFF we were going to use 802.1ah, it could allow us to > > > > > use the "back-bone" DA/SA for next-hop/previous-hop and the > > > > > "customer" DA/SA for egress/ingress RBridges. But that would > > > > > be using it in a way that is not consistent with the intended > > > > > use of 802.1ah - simply because that usage would make use of > > > > > the fields in a way that matches the way that your proposed > > > > > "short-hand" SHIM header would use them. > > > > > > > > > > If you did that, there would be room for using the B-tag > > > > > and I-tag as analogues of your I-VLAN and O-VLAN tags. > > > > > > > > > > I think this is a VERY BAD idea. > > > > > > > > > > -- > > > > > Eric > > > > <snip> > > > > > > > > > > Received: from smtp01.uc3m.es (smtp01.uc3m.es [163.117.136.121]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBE6Y0HY010429 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Wed, 13 Dec 2006 22:34:01 -0800 (PST) Received: from smtp01.uc3m.es (localhost [127.0.0.1]) by localhost.uc3m.es (Postfix) with ESMTP id 1A93A1116EF; Thu, 14 Dec 2006 07:33:59 +0100 (CET) Received: from [10.0.0.6] (39.Red-80-37-137.staticIP.rima-tde.net [80.37.137.39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp01.uc3m.es (Postfix) with ESMTP id D19891117E1; Thu, 14 Dec 2006 07:33:57 +0100 (CET) Message-ID: <4580F055.2010800@it.uc3m.es> Date: Thu, 14 Dec 2006 07:33:57 +0100 From: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: "Gray, Eric" <Eric.Gray@marconi.com>, Don Fedyk <dwfedyk@nortel.com> References: <0BF76B30C100624BA997C9CED19D812501017CE3@uspitsmsgusr08.win.marconi.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501017CE3@uspitsmsgusr08.win.marconi.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gibanez@it.uc3m.es Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 14 Dec 2006 06:34:09 -0000 Status: RO Content-Length: 7515 Just a side comment. I think the ongoing discussion is not about encapsulation but about the fundamentals of RBridges approach versus 802.1ah's. So, while agreeing on the great sinergies of a common encapsulation, lack of TTL is an essential point that reflects the essential difference in the deployment fields assumed. If we assume a deployment field as for 802.1ah, encapsulations and proposals much simpler than 802.1ah are possible (one is described in my ABridges draft). If this is the case we should restart WG discussion from the beguinning. Encapsulation for RBridges is not simple, and 802.1ah isn't simple either, specially considering the campus networks of moderate sizes that are the target for RBridges. Guillermo Gray, Eric escribi?: > Don, > > I think you've garbled the discussion, somewhat. > > Please see below... > > -- > Eric > > >> -----Original Message----- >> From: Don Fedyk [mailto:dwfedyk@nortel.com] >> Sent: Wednesday, December 13, 2006 1:19 PM >> To: Gray, Eric >> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali >> Sajassi (sajassi); Silvano Gai >> Subject: RE: [rbridge] Use of 802.1ah Encaps >> >> Hi Eric >> >> >>> -----Original Message----- >>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] >>> >>> Don, >>> >>> I don't follow your reasoning. >>> >> That's OK I cant follow you sometimes either ;-) >> >> >>> I certainly am not saying that using "ANY standard header" >>> is a bad idea. >>> >> Then why not start from ah? The bit that Silvano said was we >> could use ah and you said it is a bad idea. >> > > I don't think I am quoting too much out of context, when I quote > the following from Silvano's reply to Joe Touch: > > SILVANO > My comment is that IEEE 802.1ah has no space for both > SILVANO > the ultimate source/dest and the next hop source/dest. > > SILVANO > IEEE 802.1ah is designed for multiple enterprises to > SILVANO > share a common metro backbone. It does a fine job in > SILVANO > that area. It does not support well an arbitrary > SILVANO > intermixing of Bridges and Rbridges. > > SILVANO > In contrast Trill does a fine job in supporting > SILVANO > arbitrary topologies and mixing of RBridges and > SILVANO > Bridges thanks to the availability of both the > SILVANO > ultimate source/dest and the next hop source/dest. > > SILVANO > In TRILL the network between the "ingress" and > SILVANO > "egress" RBridge isn't a single Ethernet (like in > SILVANO > 802.1ah), but rather a sequence of RBridges that > SILVANO > may be connected by Ethernets. > > SILVANO > Things look similar, but are substantially different. > > Given that this is what (I believe, at least) Silvano said > about using 802.1ah, where do you get the impression that > Silvano has said that "we could use ah"? > > >> Please describe "BAD idea" then. >> > > In this, I think quite a few of us are now in agreement. > > It is rarely a good idea to use a header format just because > most of the bits look similar to one proposal that has all > of the information you require. > > Suppose you started to think that using 802.1ah - because it > is similar to an abbreviated combination of (MAC+SHIM)-in-MAC > - was an example of one of the rare instances in which this > might be a good idea. Wouldn't you suspect that the need to > consider potentially adding a TTL field to the header might > be an indication that you are probably wrong? > > So, to answer your question, a "BAD idea" is one that takes > valuable resources to explore and offers no believable cause > to suspect that it will work better than other ideas already > on the table. > > In this case, we have reason to believe (MAC+SHIM)-in-MAC > will work and no reason to believe that 802.1ah will work > better - even assuming we went down that rat-hole. > > >>> As for "creating a new forwarding paradigm" - yes, we're >>> doing a little bit of that. Ideally, we'll be doing as little >>> of that as we can get away with. The "little bit" we have to >>> do is to use some additional header information to: >>> >>> 1) forward frames on the shortest path between RBridges, >>> and >>> 2) reduce or eliminate potential looping of frames during >>> a perturbation of the shortest path. >>> >> You have so far chosen to do this in a mode that optimizes for mixed >> bridges at the cost of ignoring the effciencies you could get between >> directly connected Rbridges. 802.1ah opimizes forwarding for connected >> Provider Backbone Bridges and interworks with legacy at a common >> denominator. >> > > Right, and 802.1ah assumes either a green-field deployment, or a > firmware modifiable deployment of PBB-(enabled/compatible) bridges. > > This is not consistent with our goals. > > >>> This may be somewhat of a simplification, but that's fair in >>> light of the general trend for casual observers to do the >>> opposite. >>> >>> Currently, we define a SHIM to carry this information and >>> we expect to use one or more "standard headers" to encapsulate >>> frames being forwarded between RBridges. >>> >>> Does this make things clearer? >>> >> Eric I understand what is proposed but I still question if a greater >> synergy cannot be achieved between encapsulating headers. A shim is a >> not a typical solution but encapsulations are. >> > > Greater synergy is always demonstrably possible if you're willing > to wait long enough. > > That's - for example - why we only have one link-state routing > protocol, and why Ethernet was the one and only MAC-like format > for L2 frames ever to have been used. > > What planet are we on? :-) > > >> Regards, >> Don >> >> >> >>> -- >>> Eric >>> >>> >>>> -----Original Message----- >>>> From: Don Fedyk [mailto:dwfedyk@nortel.com] >>>> Sent: Wednesday, December 13, 2006 12:18 PM >>>> To: Gray, Eric; Silvano Gai >>>> Cc: Developing a hybrid router/bridge.; Joe Touch; Ali >>>> Sajassi (sajassi) >>>> Subject: RE: [rbridge] Use of 802.1ah Encaps >>>> >>>> Hi Eric >>>> >>>> This argument says if you use ANY standard header then it >>>> >>> would be a bad >>> >>>> idea. >>>> >>>> So you are creating a new forwarding paradigm and the down >>>> >>> side of that >>> >>>> as Ali pointed out is now you have to create most of the >>>> >>> other things >>> >>>> that go along with new forwarding paradigm. >>>> >>>> Don >>>> >>>> >>>>> -----Original Message----- >>>>> From: Gray, Eric [mailto:Eric.Gray@marconi.com] >>>>> Sent: Tuesday, December 12, 2006 4:29 PM >>>>> >>>>> Silvano, >>>>> >>>>> IFF we were going to use 802.1ah, it could allow us to >>>>> use the "back-bone" DA/SA for next-hop/previous-hop and the >>>>> "customer" DA/SA for egress/ingress RBridges. But that would >>>>> be using it in a way that is not consistent with the intended >>>>> use of 802.1ah - simply because that usage would make use of >>>>> the fields in a way that matches the way that your proposed >>>>> "short-hand" SHIM header would use them. >>>>> >>>>> If you did that, there would be room for using the B-tag >>>>> and I-tag as analogues of your I-VLAN and O-VLAN tags. >>>>> >>>>> I think this is a VERY BAD idea. >>>>> >>>>> -- >>>>> Eric >>>>> >>>> <snip> >>>> >>>> > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBE00wmX027811 for <rbridge@postel.org>; Wed, 13 Dec 2006 16:00:58 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBE00kSL006001; Wed, 13 Dec 2006 19:00:46 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id TAA09819; Wed, 13 Dec 2006 19:00:45 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0WD9D>; Wed, 13 Dec 2006 19:00:44 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017CE3@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com> Date: Wed, 13 Dec 2006 19:00:39 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 14 Dec 2006 00:01:36 -0000 Status: RO Content-Length: 6316 Don, I think you've garbled the discussion, somewhat. Please see below... -- Eric > -----Original Message----- > From: Don Fedyk [mailto:dwfedyk@nortel.com] > Sent: Wednesday, December 13, 2006 1:19 PM > To: Gray, Eric > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > Sajassi (sajassi); Silvano Gai > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Hi Eric > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > Don, > > > > I don't follow your reasoning. > That's OK I cant follow you sometimes either ;-) > > > > > I certainly am not saying that using "ANY standard header" > > is a bad idea. > Then why not start from ah? The bit that Silvano said was we > could use ah and you said it is a bad idea. I don't think I am quoting too much out of context, when I quote the following from Silvano's reply to Joe Touch: SILVANO > My comment is that IEEE 802.1ah has no space for both SILVANO > the ultimate source/dest and the next hop source/dest. SILVANO > IEEE 802.1ah is designed for multiple enterprises to SILVANO > share a common metro backbone. It does a fine job in SILVANO > that area. It does not support well an arbitrary SILVANO > intermixing of Bridges and Rbridges. SILVANO > In contrast Trill does a fine job in supporting SILVANO > arbitrary topologies and mixing of RBridges and SILVANO > Bridges thanks to the availability of both the SILVANO > ultimate source/dest and the next hop source/dest. SILVANO > In TRILL the network between the "ingress" and SILVANO > "egress" RBridge isn't a single Ethernet (like in SILVANO > 802.1ah), but rather a sequence of RBridges that SILVANO > may be connected by Ethernets. SILVANO > Things look similar, but are substantially different. Given that this is what (I believe, at least) Silvano said about using 802.1ah, where do you get the impression that Silvano has said that "we could use ah"? > > Please describe "BAD idea" then. In this, I think quite a few of us are now in agreement. It is rarely a good idea to use a header format just because most of the bits look similar to one proposal that has all of the information you require. Suppose you started to think that using 802.1ah - because it is similar to an abbreviated combination of (MAC+SHIM)-in-MAC - was an example of one of the rare instances in which this might be a good idea. Wouldn't you suspect that the need to consider potentially adding a TTL field to the header might be an indication that you are probably wrong? So, to answer your question, a "BAD idea" is one that takes valuable resources to explore and offers no believable cause to suspect that it will work better than other ideas already on the table. In this case, we have reason to believe (MAC+SHIM)-in-MAC will work and no reason to believe that 802.1ah will work better - even assuming we went down that rat-hole. > > > > > As for "creating a new forwarding paradigm" - yes, we're > > doing a little bit of that. Ideally, we'll be doing as little > > of that as we can get away with. The "little bit" we have to > > do is to use some additional header information to: > > > > 1) forward frames on the shortest path between RBridges, > > and > > 2) reduce or eliminate potential looping of frames during > > a perturbation of the shortest path. > > You have so far chosen to do this in a mode that optimizes for mixed > bridges at the cost of ignoring the effciencies you could get between > directly connected Rbridges. 802.1ah opimizes forwarding for connected > Provider Backbone Bridges and interworks with legacy at a common > denominator. Right, and 802.1ah assumes either a green-field deployment, or a firmware modifiable deployment of PBB-(enabled/compatible) bridges. This is not consistent with our goals. > > > > > This may be somewhat of a simplification, but that's fair in > > light of the general trend for casual observers to do the > > opposite. > > > > Currently, we define a SHIM to carry this information and > > we expect to use one or more "standard headers" to encapsulate > > frames being forwarded between RBridges. > > > > Does this make things clearer? > > Eric I understand what is proposed but I still question if a greater > synergy cannot be achieved between encapsulating headers. A shim is a > not a typical solution but encapsulations are. Greater synergy is always demonstrably possible if you're willing to wait long enough. That's - for example - why we only have one link-state routing protocol, and why Ethernet was the one and only MAC-like format for L2 frames ever to have been used. What planet are we on? :-) > > Regards, > Don > > > > > > -- > > Eric > > > > > -----Original Message----- > > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > > Sent: Wednesday, December 13, 2006 12:18 PM > > > To: Gray, Eric; Silvano Gai > > > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > > > Sajassi (sajassi) > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > Hi Eric > > > > > > This argument says if you use ANY standard header then it > > would be a bad > > > idea. > > > > > > So you are creating a new forwarding paradigm and the down > > side of that > > > as Ali pointed out is now you have to create most of the > > other things > > > that go along with new forwarding paradigm. > > > > > > Don > > > > > > > -----Original Message----- > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > Sent: Tuesday, December 12, 2006 4:29 PM > > > > > > > > Silvano, > > > > > > > > IFF we were going to use 802.1ah, it could allow us to > > > > use the "back-bone" DA/SA for next-hop/previous-hop and the > > > > "customer" DA/SA for egress/ingress RBridges. But that would > > > > be using it in a way that is not consistent with the intended > > > > use of 802.1ah - simply because that usage would make use of > > > > the fields in a way that matches the way that your proposed > > > > "short-hand" SHIM header would use them. > > > > > > > > If you did that, there would be room for using the B-tag > > > > and I-tag as analogues of your I-VLAN and O-VLAN tags. > > > > > > > > I think this is a VERY BAD idea. > > > > > > > > -- > > > > Eric > > > <snip> > > > > > > Received: from zcars04f.nortel.com (zcars04f.nortel.com [47.129.242.57]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBDIKAnw003564 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Wed, 13 Dec 2006 10:20:11 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zcars04f.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id kBDIJOB18664; Wed, 13 Dec 2006 13:19:24 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 13 Dec 2006 13:19:23 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C6B7864@zrtphxm2.corp.nortel.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501017BF4@uspitsmsgusr08.win.marconi.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: Acce3D5OtoRUUDxtQpue+cG2VO/sLAAAEn8w From: "Don Fedyk" <dwfedyk@nortel.com> To: "Gray, Eric" <Eric.Gray@marconi.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBDIKAnw003564 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 13 Dec 2006 18:20:59 -0000 Status: RO Content-Length: 3175 Hi Eric > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Don, > > I don't follow your reasoning. That's OK I cant follow you sometimes either ;-) > > I certainly am not saying that using "ANY standard header" > is a bad idea. Then why not start from ah? The bit that Silvano said was we could use ah and you said it is a bad idea. Please describe "BAD idea" then. > > As for "creating a new forwarding paradigm" - yes, we're > doing a little bit of that. Ideally, we'll be doing as little > of that as we can get away with. The "little bit" we have to > do is to use some additional header information to: > > 1) forward frames on the shortest path between RBridges, > and > 2) reduce or eliminate potential looping of frames during > a perturbation of the shortest path. You have so far chosen to do this in a mode that optimizes for mixed bridges at the cost of ignoring the effciencies you could get between directly connected Rbridges. 802.1ah opimizes forwarding for connected Provider Backbone Bridges and interworks with legacy at a common denominator. > > This may be somewhat of a simplification, but that's fair in > light of the general trend for casual observers to do the > opposite. > > Currently, we define a SHIM to carry this information and > we expect to use one or more "standard headers" to encapsulate > frames being forwarded between RBridges. > > Does this make things clearer? Eric I understand what is proposed but I still question if a greater synergy cannot be achieved between encapsulating headers. A shim is a not a typical solution but encapsulations are. Regards, Don > > -- > Eric > > > -----Original Message----- > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > Sent: Wednesday, December 13, 2006 12:18 PM > > To: Gray, Eric; Silvano Gai > > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > > Sajassi (sajassi) > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Hi Eric > > > > This argument says if you use ANY standard header then it > would be a bad > > idea. > > > > So you are creating a new forwarding paradigm and the down > side of that > > as Ali pointed out is now you have to create most of the > other things > > that go along with new forwarding paradigm. > > > > Don > > > > > -----Original Message----- > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > Sent: Tuesday, December 12, 2006 4:29 PM > > > > > > Silvano, > > > > > > IFF we were going to use 802.1ah, it could allow us to > > > use the "back-bone" DA/SA for next-hop/previous-hop and the > > > "customer" DA/SA for egress/ingress RBridges. But that would > > > be using it in a way that is not consistent with the intended > > > use of 802.1ah - simply because that usage would make use of > > > the fields in a way that matches the way that your proposed > > > "short-hand" SHIM header would use them. > > > > > > If you did that, there would be room for using the B-tag > > > and I-tag as analogues of your I-VLAN and O-VLAN tags. > > > > > > I think this is a VERY BAD idea. > > > > > > -- > > > Eric > > <snip> > > > Received: from clifford.inescn.pt (clifford.inescn.pt [192.35.246.3]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBDHvcoX025190 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Wed, 13 Dec 2006 09:57:39 -0800 (PST) Received: from localhost (localhost.localdomain [127.0.0.1]) by clifford.inescn.pt (8.13.8/8.13.8/1) with ESMTP id kBDHvUjd003430; Wed, 13 Dec 2006 17:57:30 GMT X-Virus-Scanned: amavisd-new at inescporto.pt Received: from clifford.inescn.pt ([127.0.0.1]) by localhost (clifford.inescn.pt [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 9pGXRej7KjsN; Wed, 13 Dec 2006 17:57:14 +0000 (WET) Received: from pong.inescporto.pt (pong.inescn.pt [194.117.26.74]) by clifford.inescn.pt (8.13.8/8.13.8/8) with ESMTP id kBDHv3AF003399; Wed, 13 Dec 2006 17:57:03 GMT Received: from [194.117.26.60] (spectrum.inescn.pt [194.117.26.60]) by pong.inescporto.pt (Postfix) with ESMTP id 91A02BC48; Wed, 13 Dec 2006 17:57:05 +0000 (WET) From: "Gustavo J. A. M. Carneiro" <gjc@inescporto.pt> To: Joe Touch <touch@ISI.EDU> In-Reply-To: <4580350D.7030006@isi.edu> References: <0BF76B30C100624BA997C9CED19D812501017AC8@uspitsmsgusr08.win.marconi.com> <1166027688.6321.16.camel@localhost> <4580350D.7030006@isi.edu> Content-Type: text/plain Organization: INESC Porto Date: Wed, 13 Dec 2006 17:57:03 +0000 Message-Id: <1166032623.6321.24.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.8.1 Content-Transfer-Encoding: 7bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gjc@inescporto.pt Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] IP data plane (Was: Use of 802.1ah Encaps) X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 13 Dec 2006 17:58:18 -0000 Status: RO Content-Length: 1358 On Qua, 2006-12-13 at 09:14 -0800, Joe Touch wrote: > > Gustavo J. A. M. Carneiro wrote: > > Hello, > > > > Sorry to intrude, I just wanted to play devil's advocate here.. ;-) > > > > On Ter, 2006-12-12 at 16:51 -0500, Gray, Eric wrote: > >> Joe, > >> > >> It's a huge drawback, and it requires configuration of > >> at least IP addresses - possibly per-interface. That is not > >> going to work very well as a plug-and-play solution. > > > > An IP based data plane does not imply that you need configuration, not > > even IP addresses on interfaces. Think of IP adhoc protocols > > (AODV/OLSR/etc.); they derive IP addresses from the L2 MAC address, or > > simply generate a random IP. > > That works only if there is NO other IP traffic on that plane. We don't > know that rbridges will talk to each other over dedicated paths that > don't involve non-rbridge to non-rbridge traffic. > > In that case, the IP addresses sent on certain link addresses - notably > multicast and broadcast - could interfere between rbridge use of those > addresses and non-rbridge use of those addresses. Also not a problem: RBridges could use an IP data plane, but using a different EtherType, different from the usual 0x0800. -- Gustavo J. A. M. Carneiro <gjc@inescporto.pt> <gustavo@users.sourceforge.net> The universe is always one step beyond logic. Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBDHTTPo016018 for <rbridge@postel.org>; Wed, 13 Dec 2006 09:29:30 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBDHTLSL000139; Wed, 13 Dec 2006 12:29:21 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id MAA19193; Wed, 13 Dec 2006 12:29:20 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0V9LA>; Wed, 13 Dec 2006 12:29:20 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017BF4@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com> Date: Wed, 13 Dec 2006 12:29:10 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 13 Dec 2006 17:30:19 -0000 Status: RO Content-Length: 2232 Don, I don't follow your reasoning. I certainly am not saying that using "ANY standard header" is a bad idea. As for "creating a new forwarding paradigm" - yes, we're doing a little bit of that. Ideally, we'll be doing as little of that as we can get away with. The "little bit" we have to do is to use some additional header information to: 1) forward frames on the shortest path between RBridges, and 2) reduce or eliminate potential looping of frames during a perturbation of the shortest path. This may be somewhat of a simplification, but that's fair in light of the general trend for casual observers to do the opposite. Currently, we define a SHIM to carry this information and we expect to use one or more "standard headers" to encapsulate frames being forwarded between RBridges. Does this make things clearer? -- Eric > -----Original Message----- > From: Don Fedyk [mailto:dwfedyk@nortel.com] > Sent: Wednesday, December 13, 2006 12:18 PM > To: Gray, Eric; Silvano Gai > Cc: Developing a hybrid router/bridge.; Joe Touch; Ali > Sajassi (sajassi) > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Hi Eric > > This argument says if you use ANY standard header then it would be a bad > idea. > > So you are creating a new forwarding paradigm and the down side of that > as Ali pointed out is now you have to create most of the other things > that go along with new forwarding paradigm. > > Don > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Sent: Tuesday, December 12, 2006 4:29 PM > > > > Silvano, > > > > IFF we were going to use 802.1ah, it could allow us to > > use the "back-bone" DA/SA for next-hop/previous-hop and the > > "customer" DA/SA for egress/ingress RBridges. But that would > > be using it in a way that is not consistent with the intended > > use of 802.1ah - simply because that usage would make use of > > the fields in a way that matches the way that your proposed > > "short-hand" SHIM header would use them. > > > > If you did that, there would be room for using the B-tag > > and I-tag as analogues of your I-VLAN and O-VLAN tags. > > > > I think this is a VERY BAD idea. > > > > -- > > Eric > <snip> > Received: from zcars04f.nortel.com (zcars04f.nortel.com [47.129.242.57]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBDHIaIN012142 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Wed, 13 Dec 2006 09:18:37 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zcars04f.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id kBDHI9B01077; Wed, 13 Dec 2006 12:18:09 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 13 Dec 2006 12:18:08 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C6B7737@zrtphxm2.corp.nortel.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501017AA0@uspitsmsgusr08.win.marconi.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AcceNJ/Oa5oagu4xSwiEnSpNbWrdXAAAPi9Q From: "Don Fedyk" <dwfedyk@nortel.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Silvano Gai" <sgai@nuovasystems.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBDHIaIN012142 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 13 Dec 2006 17:19:18 -0000 Status: RO Content-Length: 1028 Hi Eric This argument says if you use ANY standard header then it would be a bad idea. So you are creating a new forwarding paradigm and the down side of that as Ali pointed out is now you have to create most of the other things that go along with new forwarding paradigm. Don > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > Sent: Tuesday, December 12, 2006 4:29 PM > > Silvano, > > IFF we were going to use 802.1ah, it could allow us to > use the "back-bone" DA/SA for next-hop/previous-hop and the > "customer" DA/SA for egress/ingress RBridges. But that would > be using it in a way that is not consistent with the intended > use of 802.1ah - simply because that usage would make use of > the fields in a way that matches the way that your proposed > "short-hand" SHIM header would use them. > > If you did that, there would be room for using the B-tag > and I-tag as analogues of your I-VLAN and O-VLAN tags. > > I think this is a VERY BAD idea. > > -- > Eric <snip> Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBDHFMN1010885 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Wed, 13 Dec 2006 09:15:23 -0800 (PST) Received: from [127.0.0.1] (priras01.isi.edu [128.9.176.219]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kBDHEtXM001107; Wed, 13 Dec 2006 09:14:57 -0800 (PST) Message-ID: <4580350D.7030006@isi.edu> Date: Wed, 13 Dec 2006 09:14:53 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: "Gustavo J. A. M. Carneiro" <gjc@inescporto.pt> References: <0BF76B30C100624BA997C9CED19D812501017AC8@uspitsmsgusr08.win.marconi.com> <1166027688.6321.16.camel@localhost> In-Reply-To: <1166027688.6321.16.camel@localhost> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig80454ED9355D9E5D8CED719C" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] IP data plane (Was: Use of 802.1ah Encaps) X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 13 Dec 2006 17:16:01 -0000 Status: RO Content-Length: 1815 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig80454ED9355D9E5D8CED719C Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Gustavo J. A. M. Carneiro wrote: > Hello, >=20 > Sorry to intrude, I just wanted to play devil's advocate here.. ;-) >=20 > On Ter, 2006-12-12 at 16:51 -0500, Gray, Eric wrote: >> Joe, >> >> It's a huge drawback, and it requires configuration of >> at least IP addresses - possibly per-interface. That is not >> going to work very well as a plug-and-play solution. >=20 > An IP based data plane does not imply that you need configuration, no= t > even IP addresses on interfaces. Think of IP adhoc protocols > (AODV/OLSR/etc.); they derive IP addresses from the L2 MAC address, or > simply generate a random IP. That works only if there is NO other IP traffic on that plane. We don't know that rbridges will talk to each other over dedicated paths that don't involve non-rbridge to non-rbridge traffic. In that case, the IP addresses sent on certain link addresses - notably multicast and broadcast - could interfere between rbridge use of those addresses and non-rbridge use of those addresses. --=20 ---------------------------------------- Joe Touch Sr. Network Engineer, USAF TSAT Space Segment --------------enig80454ED9355D9E5D8CED719C Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFgDUNE5f5cImnZrsRAiq+AKCnZEYU/m9Fq6y2fxNP4YgT6DgIswCeP1Cw bQ1xH5FyKajI/n780CLGOJQ= =cdyM -----END PGP SIGNATURE----- --------------enig80454ED9355D9E5D8CED719C-- Received: from pepe.inescn.pt (pepe.inescn.pt [192.35.246.13]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBDGZQuh027992 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Wed, 13 Dec 2006 08:35:28 -0800 (PST) Received: from localhost (pepe.inescn.pt [127.0.0.1]) by pepe.inescn.pt (8.13.8/8.13.8/1) with ESMTP id kBDGZCwT012590; Wed, 13 Dec 2006 16:35:12 GMT X-Virus-Scanned: amavisd-new at inescporto.pt Received: from pepe.inescn.pt ([127.0.0.1]) by localhost (pepe.inescn.pt [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 0Ye+ZeZLVD62; Wed, 13 Dec 2006 16:34:53 +0000 (WET) Received: from pong.inescporto.pt (pong.inescn.pt [194.117.26.74]) by pepe.inescn.pt (8.13.8/8.13.8/8) with ESMTP id kBDGYnDI012568; Wed, 13 Dec 2006 16:34:49 GMT Received: from [194.117.26.60] (spectrum.inescn.pt [194.117.26.60]) by pong.inescporto.pt (Postfix) with ESMTP id 31B58164739; Wed, 13 Dec 2006 16:34:51 +0000 (WET) From: "Gustavo J. A. M. Carneiro" <gjc@inescporto.pt> To: "Gray, Eric" <Eric.Gray@marconi.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501017AC8@uspitsmsgusr08.win.marconi.com> References: <0BF76B30C100624BA997C9CED19D812501017AC8@uspitsmsgusr08.win.marconi.com> Content-Type: text/plain Organization: INESC Porto Date: Wed, 13 Dec 2006 16:34:48 +0000 Message-Id: <1166027688.6321.16.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.8.1 Content-Transfer-Encoding: 7bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gjc@inescporto.pt Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] IP data plane (Was: Use of 802.1ah Encaps) X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 13 Dec 2006 16:35:46 -0000 Status: RO Content-Length: 1452 Hello, Sorry to intrude, I just wanted to play devil's advocate here.. ;-) On Ter, 2006-12-12 at 16:51 -0500, Gray, Eric wrote: > Joe, > > It's a huge drawback, and it requires configuration of > at least IP addresses - possibly per-interface. That is not > going to work very well as a plug-and-play solution. An IP based data plane does not imply that you need configuration, not even IP addresses on interfaces. Think of IP adhoc protocols (AODV/OLSR/etc.); they derive IP addresses from the L2 MAC address, or simply generate a random IP. > In addition, as you hint at, you're effectively now a > part of the routing L3 network - as opposed to part of the > bridging L2 network. It would make little sense - at that > point - to try to differentiate RBridges from routers as it > is already established that routers can be built and used > in real networks. There is still some advantage: normal routers need configuration, RBridges don't. But at the same time you can reuse existing IP forwarding blocks of routers. But if you are really looking for arguments against IP data plane: 1. Larger header size; 2. Larger (32-bits) addresses (vs. 16-bits of rbridge nick names); 3. Obfuscation, e.g. some fields are there but not used by RBridges (like fragmentation control). Regards, -- Gustavo J. A. M. Carneiro <gjc@inescporto.pt> <gustavo@users.sourceforge.net> The universe is always one step beyond logic. Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBCLr8DU021753 for <rbridge@postel.org>; Tue, 12 Dec 2006 13:53:09 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBCLpdSL018112; Tue, 12 Dec 2006 16:51:39 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id QAA05944; Tue, 12 Dec 2006 16:51:39 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0VTPL>; Tue, 12 Dec 2006 16:51:38 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017AC8@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Joe Touch <touch@ISI.EDU> Date: Tue, 12 Dec 2006 16:51:37 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2006 21:53:33 -0000 Status: RO Content-Length: 1790 Joe, It's a huge drawback, and it requires configuration of at least IP addresses - possibly per-interface. That is not going to work very well as a plug-and-play solution. In addition, as you hint at, you're effectively now a part of the routing L3 network - as opposed to part of the bridging L2 network. It would make little sense - at that point - to try to differentiate RBridges from routers as it is already established that routers can be built and used in real networks. If you're building a box that acts like a router, then build a router. Nothing much for us to do in that case. -- Eric > -----Original Message----- > From: Joe Touch [mailto:touch@ISI.EDU] > Sent: Tuesday, December 12, 2006 12:10 PM > To: Ali Sajassi (sajassi) > Cc: Silvano Gai; Radia.Perlman@sun.com; Don Fedyk; Gray, > Eric; Developing a hybrid router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > Ali Sajassi (sajassi) wrote: > >... > >> Can you please describe the header you're considering an > >> alternative, e.g, where the current one is: > >> [outer ether [6-byte shim] [inner ether [payload]]] > > > > [outer ether][20-byte IP header][4 or 8 byte L2TPv3/GRE shim] > > [inner Ether [payload]] > > > > The draw back is the additional 20 bytes of IP header but > the advantage > > is that you can use the IGP as is :-) > > That's a fairly large drawback. > > Also, how might this affect an IP protocol running on links over which > rbridge nodes communicate? I.e., don't you have to de-conflict the IP > addresses and possibly also the IGP to avoid interference > between the two? > > Our system has a shim just inside the outer ether, i.e., using a > different ethertype; that effectively forces non-rbridge systems to > ignore the packets. > > Joe > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBCLcHKE015741 for <rbridge@postel.org>; Tue, 12 Dec 2006 13:38:21 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBCLc6SL017823; Tue, 12 Dec 2006 16:38:06 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id QAA05102; Tue, 12 Dec 2006 16:38:00 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0VT2D>; Tue, 12 Dec 2006 16:38:00 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017ABC@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: "Ali Sajassi (sajassi)" <sajassi@cisco.com>, Radia.Perlman@sun.com Date: Tue, 12 Dec 2006 16:37:59 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2006 21:39:10 -0000 Status: RO Content-Length: 8394 Ali, I agree with your argument below in every sense. But I fail to see why that argument leads to a recommendation to use 802.1ah encapsulation. We were initially expecting to use 802.3 Ethernet encapsulation of a SHIM-encapsulated, tunneled Ethernet frame. That is a use of IEEE-conformant frame formats. -- Eric > -----Original Message----- > From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] > Sent: Sunday, December 10, 2006 6:07 PM > To: Radia.Perlman@sun.com > Cc: Silvano Gai; Don Fedyk; Gray, Eric; Developing a hybrid > router/bridge.; Joe Touch > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > -----Original Message----- > > From: Radia.Perlman@sun.com [mailto:Radia.Perlman@sun.com] > > Sent: Thursday, December 07, 2006 9:56 PM > > To: Ali Sajassi (sajassi) > > Cc: Silvano Gai; Don Fedyk; Gray, Eric; Developing a hybrid > > router/bridge.; Joe Touch > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > Travelling again, so extremely limited access to email (as > > in, about 10 minutes here and there on a SLOW connection). > > Anyway, I'll answer some of these: > > Also sorry for not being able to respond to your email > earlier due to my > schedule/meetings (specially on Friday). > > > > > a) why "next hop" and "previous hop" in addition to > > "ultimate" source and destination > > > > At least one of the reasons is that if there are three > > RBridges on the same link, R1, R2, and R3, it is useful for > > R1 to choose which of R2 or R3 should receive the packet. It > > isn't obvious from the destination address because it could > > be that either R2 or R3 would be logical, and R1 is load > > splitting. Also, it helps focus traffic on the link, and > > ensure it doesn't get filtered, if the bridges on the link > > only need to learn R1, R2, and R3, especially since traffic > > from outside RBridges might arrive from different entry > > points onto the link. > > O.K., I remember now the discussion that we had during the > IETF meeting > on load balancing and next hop address. However, there are couple of > ways for achieving the same result. I mentioned briefly during the > meeting the use of VLAN for this purpose and someone else mentioned > using part of 48-bit provider MAC address for this purpose. > > > > > b) congestion management was explained to us, and it was what > > convinced us we needed "ultimate source RBridge" in order to > > know where to send the congestion notification. If you could > > explain the other things, we could see if there is a problem, > > but if they are similar to congestion notification, then > > having the ingress RBridge will accommodate them. > > > > With respect to CFM, connectivity fault mgmt is done in a hierarchical > way and it can be performed at the provider service instance level > (e.g., on a per I-SID basis) or it can be performed for group > of I-SIDs > on a per B-VLAN level. In both cases, provider MAC addresses are used > which makes the provider OAM control for customer data-traffic very > tight. You cannot get the same result by using OAM messages that use > customer MAC addresses and if you try to do it will be very > cumbersome. > > Basically what I am trying to point out is that by using non-IEEE > conformance frame format, you assume the responsibility for all the > features developed by IEEE; where as, if you use IEEE > conformant frame, > then one can concentrate on the control plane issues which I > thought was > the main objective of TRILL. > > -Ali > > > Sorry for ignoring all the other messages for now, but I only > > had a chance to read and respond to one message. > > > > Radia > > > > ----- Original Message ----- > > From: "Ali Sajassi (sajassi)" <sajassi@cisco.com> > > Date: Friday, December 8, 2006 10:53 am > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > > > Silvano, > > > > > > > -----Original Message----- > > > > From: Silvano Gai [sgai@nuovasystems.com] > > > > Sent: Thursday, December 07, 2006 5:36 PM > > > > To: Don Fedyk; Gray, Eric; Ali Sajassi (sajassi) > > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > > > > > > > IMO it is technically possible for TRILL to adopt IEEE 802.1ah. > > > > There are advantages and disadvantages. > > > > > > > > The disadvantages are: > > > > 1) Lack of Next-Hop addresses. We discussed this at > length during > > > > the last meeting and we didn't reach consensus on a way > > to eliminate > > > > them. > > > > > > Can you refresh my memory for why we need a next-hop > > address when the > > > header carries both source and destination PE addresses and > > when these > > > addresses are learned in control plane ? > > > > > > > 2) Lack of a TTL field (it may be added, but it is not > > there today). > > > > > > Can probably be accommodated. > > > > > > > 3) Many unneeded fields and therefore larger frame overhead. > > > > > > > > > > Such as ? > > > > > > > The advantages are: > > > > 1) Larger addressable market for TRILL > > > > > > > > IMO if we stick with the WG charter the disadvantages clearly > > > > outweigh the advantages. > > > > > > > > The WG can be re-chartered, but if we consider the > Enterprise and > > > > Data Center market, IEEE 802.1ah is an overkill. > > > > > > > > > > If by overkill you mean a bit bigger header, then I agree > > but look at > > > all the other advantages that you get from using standard > > IEEE header > > > and shim including: > > > - security Mgmt: MACSec/KeySec > > > - Congestion Mgmt > > > - Connectivity Fault Mgmt > > > > > > Has it been considered how these are going to work with > TRILL shim > > > header or are these outside of WG charter :-) > > > > > > -Ali > > > > > > > > > > -- Silvano > > > > > > > > > > > > > -----Original Message----- > > > > > From: rbridge-bounces@postel.org [rbridge-bounces@postel.org] > > > > On > > > > > Behalf Of Don Fedyk > > > > > Sent: Thursday, December 07, 2006 9:21 AM > > > > > To: Gray, Eric; Ali Sajassi (sajassi) > > > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > > > > > Hi Eric > > > > > > > > > > > -----Original Message----- > > > > > > From: Gray, Eric [Eric.Gray@marconi.com] > > > > > > > > > > > > Don, > > > > > > > > > > > > And yet, someone (Ali Sajassi) asserted (in his message > > > > dated Wed > > > > > > 12/6/2006 at 2:16 PM EST) that there were no issues or > > > additional > > > > > > complications with using 802.1ah in enterprises for > plug-and- > > > play > > > > > > applicability. > > > > > > > > > > > > Perhaps Ali can answer my question then. > > > > > > > > > > > > But, to more directly address your earlier comments: > > > > > > > > > > > > The TRILL WG has NOT come up with an encapsulation that > > > "looks > > > > > > like" 802.1ah - unless someone squints really hard and tries > > > to > > > > > > pretend that two separate Ethernet encapsulations - > > > > separated by a > > > > > > SHIM header - are one single encapsulation. > > > > > > > > > > To be fair Point to Point header that was discussed without > > > > one of the > > > > > shims was very close "functionally" (colloquial looks like) to > > > > 802.1ah. > > > > > My opinion is still we don't need several variations of > > > > headers doing > > > > > similar things. > > > > > > > > > > This was the slide that looked a lot like what I posted. > > > > > > > > > > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > > > > > > > > > Regards, > > > > > Don > > > > > > > > > > > > That is not to say that the WG has done anything that > > > > could be said > > > > > > to disallow the use of 802.1ah encapsulation. > > > > > > It is just not obviously consistent with all of the WG > > > > goals to use > > > > > > _only_ 802.1ah encapsulation. > > > > > > > > > > > > -- > > > > > > Eric > > > > > > > > > > > > > > > > _______________________________________________ > > > > > rbridge mailing list > > > > > rbridge@postel.org > > > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > > > > > > > _______________________________________________ > > > rbridge mailing list > > > rbridge@postel.org > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBCLTb9u012372 for <rbridge@postel.org>; Tue, 12 Dec 2006 13:29:38 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBCLTKSL017603; Tue, 12 Dec 2006 16:29:20 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id QAA04486; Tue, 12 Dec 2006 16:29:20 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0VTD2>; Tue, 12 Dec 2006 16:29:19 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017AA0@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Silvano Gai <sgai@nuovasystems.com> Date: Tue, 12 Dec 2006 16:29:19 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2006 21:30:05 -0000 Status: RO Content-Length: 5340 Silvano, IFF we were going to use 802.1ah, it could allow us to use the "back-bone" DA/SA for next-hop/previous-hop and the "customer" DA/SA for egress/ingress RBridges. But that would be using it in a way that is not consistent with the intended use of 802.1ah - simply because that usage would make use of the fields in a way that matches the way that your proposed "short-hand" SHIM header would use them. If you did that, there would be room for using the B-tag and I-tag as analogues of your I-VLAN and O-VLAN tags. I think this is a VERY BAD idea. -- Eric > -----Original Message----- > From: Silvano Gai [mailto:sgai@nuovasystems.com] > Sent: Friday, December 08, 2006 10:07 AM > To: Ali Sajassi (sajassi); Don Fedyk; Gray, Eric > Cc: Developing a hybrid router/bridge.; Joe Touch > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Ali, > > Inline: > > > -----Original Message----- > > From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] > > Sent: Thursday, December 07, 2006 9:23 PM > > To: Silvano Gai; Don Fedyk; Gray, Eric > > Cc: Developing a hybrid router/bridge.; Joe Touch > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > Silvano, > > > > > -----Original Message----- > > > From: Silvano Gai [mailto:sgai@nuovasystems.com] > > > Sent: Thursday, December 07, 2006 5:36 PM > > > To: Don Fedyk; Gray, Eric; Ali Sajassi (sajassi) > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > > > > IMO it is technically possible for TRILL to adopt IEEE 802.1ah. > > > There are advantages and disadvantages. > > > > > > The disadvantages are: > > > 1) Lack of Next-Hop addresses. We discussed this at length > > > during the last meeting and we didn't reach consensus on a > > > way to eliminate them. > > > > Can you refresh my memory for why we need a next-hop > address when the > > header carries both source and destination PE addresses and > when these > > addresses are learned in control plane ? > > > > Radia did in her reply > > > > 2) Lack of a TTL field (it may be added, but it is not > there today). > > > > Can probably be accommodated. > > > > > 3) Many unneeded fields and therefore larger frame overhead. > > > > > > > Such as ? > > The I-tag is not useful in TRILL and in contrast two addresses and the > TTL are missing. > > > > > > The advantages are: > > > 1) Larger addressable market for TRILL > > > > > > IMO if we stick with the WG charter the disadvantages clearly > > > outweigh the advantages. > > > > > > The WG can be re-chartered, but if we consider the Enterprise > > > and Data Center market, IEEE 802.1ah is an overkill. > > > > > > > If by overkill you mean a bit bigger header, then I agree > but look at > > all the other advantages that you get from using standard > IEEE header > > and shim including: > > - security Mgmt: MACSec/KeySec > > - Congestion Mgmt > > - Connectivity Fault Mgmt > > > > Has it been considered how these are going to work with TRILL shim > > header or are these outside of WG charter :-) > > > > -Ali > > > > > > > -- Silvano > > > > > > > > > > -----Original Message----- > > > > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] > > > On > > > > Behalf Of Don Fedyk > > > > Sent: Thursday, December 07, 2006 9:21 AM > > > > To: Gray, Eric; Ali Sajassi (sajassi) > > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > > > Hi Eric > > > > > > > > > -----Original Message----- > > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > > > > > Don, > > > > > > > > > > And yet, someone (Ali Sajassi) asserted (in his message > > > dated Wed > > > > > 12/6/2006 at 2:16 PM EST) that there were no issues or > additional > > > > > complications with using 802.1ah in enterprises for > plug-and-play > > > > > applicability. > > > > > > > > > > Perhaps Ali can answer my question then. > > > > > > > > > > But, to more directly address your earlier comments: > > > > > > > > > > The TRILL WG has NOT come up with an encapsulation that > "looks > > > > > like" 802.1ah - unless someone squints really hard > and tries to > > > > > pretend that two separate Ethernet encapsulations - > > > separated by a > > > > > SHIM header - are one single encapsulation. > > > > > > > > To be fair Point to Point header that was discussed without > > > one of the > > > > shims was very close "functionally" (colloquial looks like) to > > > 802.1ah. > > > > My opinion is still we don't need several variations of > > > headers doing > > > > similar things. > > > > > > > > This was the slide that looked a lot like what I posted. > > > > > > > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > > > > > > > Regards, > > > > Don > > > > > > > > > > That is not to say that the WG has done anything that > > > could be said > > > > > to disallow the use of 802.1ah encapsulation. > > > > > It is just not obviously consistent with all of the WG > > > goals to use > > > > > _only_ 802.1ah encapsulation. > > > > > > > > > > -- > > > > > Eric > > > > > > > > > > > > > _______________________________________________ > > > > rbridge mailing list > > > > rbridge@postel.org > > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBCLI3K7008271 for <rbridge@postel.org>; Tue, 12 Dec 2006 13:18:08 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBCLHrSL017384; Tue, 12 Dec 2006 16:17:53 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id QAA03852; Tue, 12 Dec 2006 16:17:52 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0VS86>; Tue, 12 Dec 2006 16:17:52 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017A8C@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: "Ali Sajassi (sajassi)" <sajassi@cisco.com>, "Gray, Eric" <Eric.Gray@marconi.com>, Don Fedyk <dwfedyk@nortel.com> Date: Tue, 12 Dec 2006 16:17:51 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2006 21:19:37 -0000 Status: RO Content-Length: 3062 Ali, Plug-and-play usually means configuration-free operation. -- Eric > -----Original Message----- > From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] > Sent: Friday, December 08, 2006 12:02 AM > To: Gray, Eric; Don Fedyk > Cc: Developing a hybrid router/bridge.; Joe Touch > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Gray, > > Please let me know if my previous email doesn't answer your > question and > if it doesn't, then let me know which portion needs further > clarification. > > -Ali > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Sent: Thursday, December 07, 2006 8:01 AM > > To: Don Fedyk; Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge.; Joe Touch > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Don, > > > > And yet, someone (Ali Sajassi) asserted (in his message > > dated Wed 12/6/2006 at 2:16 PM EST) that there were no issues > > or additional complications with using 802.1ah in enterprises > > for plug-and-play applicability. > > > > Perhaps Ali can answer my question then. > > > > But, to more directly address your earlier comments: > > > > The TRILL WG has NOT come up with an encapsulation that > > "looks like" 802.1ah - unless someone squints really hard and > > tries to pretend that two separate Ethernet encapsulations - > > separated by a SHIM header - are one single encapsulation. > > > > That is not to say that the WG has done anything that > > could be said to disallow the use of 802.1ah encapsulation. > > It is just not obviously consistent with all of the WG goals > > to use _only_ 802.1ah encapsulation. > > > > -- > > Eric > > > > > -----Original Message----- > > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > > Sent: Thursday, December 07, 2006 9:33 AM > > > To: Gray, Eric; Joe Touch; Ali Sajassi (sajassi) > > > Cc: Developing a hybrid router/bridge. > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > Hi Eric > > > > > > > -----Original Message----- > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > Sent: Thursday, December 07, 2006 8:38 AM Don, > > > > > > > > Thanks for doing this. As you can probably > attest, this is a > > > > non-trivial "digging" task to come up with this level of > > detail. I > > > > am not sure why Joe asked for it, but now that you have > > provided it, > > > > perhaps you can explain how values would be derived for > the B-TAG > > > > TCI/VID and I-TAG TCI/SID fields if we'd like to deploy this > > > > technology in > > > "plug-and-play" mode? > > > > > > I have not given much thought to plug-and-play. My advice > would be > > > learn the current semantics of the fields and see what they > > offer. I > > > don't see why these fields, which offer encapsulation, backwards > > > compatibility, Connectivity Fault Management (CFM) frames > > etc are any > > > worse than similar alternatives. > > > > > > Don > > > > > > > > > > > -- > > > > Eric > > > > > > > ><snipped hopelessly garbled> > > > > > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBCLGqSk007664 for <rbridge@postel.org>; Tue, 12 Dec 2006 13:16:52 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBCLGnSL017353; Tue, 12 Dec 2006 16:16:49 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id QAA03784; Tue, 12 Dec 2006 16:16:49 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0VS8K>; Tue, 12 Dec 2006 16:16:48 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017A88@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> Date: Tue, 12 Dec 2006 16:16:47 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2006 21:17:52 -0000 Status: RO Content-Length: 3877 Ali, No argument. But this is what you do in a break-out or interim meeting - not what you do in a working group meeting where the intention is to summarize results. There are things that were pointed out that we should consider. There are also other projects that are in the works. There are incentives to induce us toward a common solution. And there is a time and a place to go into the details, consider alternatives, etc. The minute you have 10-20 people standing at a microphone waiting for their turn to comment on the latest gyration (with a change taking place as each person steps up to take his/her turn), you're designing in committee. I think it's wrong (in many ways) to treat anything suggested during that portion of the discussion as anything other than brain-storming. It seems obvious at this point that people have had some time to think about the suggestions and eliminate many of them. I have seen only one change that appears consistently to have been agreed on over previous iterations of considering the use of a SHIM header and that has been to include both the ingress and egress RBridge "nick-names" in the SHIM. Other than for reasons of interoperability - which tends to require us to agree on a minimal set of common encapsulations that MUST be supported by all RBridges - it is actually only a diversion for us to spend time in discussion of how we might modify IEEE-defined encapsulations to support TRILL directly. It may be interesting and inspiring to talk about these things, but does it help us to get the job done? -- Eric > -----Original Message----- > From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] > Sent: Thursday, December 07, 2006 11:59 PM > To: Gray, Eric; Joe Touch > Cc: Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Sent: Thursday, December 07, 2006 5:48 AM > > To: Joe Touch; Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge. > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Joe/Ali, > > > > It is not as simple as this. > > > > The IETF has already established a precedent for > > Ethernet encapsulation of SHIM-encapsulated Ethernet. It's > > only trying to see this as a single encapsulation, that > > causes people to conclude we are inventing a new form of > > Ethernet encapsulation. > > > > Other than inappropriate "designing committee" > > discussion at the last IETF meeting, we have not been > > attempting to design any new Ethernet encapsulation. And I > > believe we should safely conclude, at this point, that the > > discussion that took place on this topic at the TRILL meeting > > last month can be closed and considered to have been > > completely unproductive. > > > I think it is always good to have discussions among ourselves > to see how > we can leverage each other expertise and technology and > whether what you > are doing can be leveraged in other applications. The basic premise in > here is that there is a good level of overlap among different > areas that > are being worked on by different WGs, and we will do each > other as well > as industry a great service if we can come up with a common solution > jointly. > > -Ali > > > > > Big surprise... > > > > -- > > Eric > > > > > -----Original Message----- > > > From: rbridge-bounces@postel.org > > > [mailto:rbridge-bounces@postel.org] On Behalf Of Joe Touch > > > Sent: Wednesday, December 06, 2006 10:23 PM > > > To: Ali Sajassi (sajassi) > > > Cc: Developing a hybrid router/bridge. > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > _______________________________________________ > > > rbridge mailing list > > > rbridge@postel.org > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > > > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBCKxJr0001953 for <rbridge@postel.org>; Tue, 12 Dec 2006 12:59:19 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kBCKxCSL017014; Tue, 12 Dec 2006 15:59:12 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id PAA02676; Tue, 12 Dec 2006 15:59:11 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0VST4>; Tue, 12 Dec 2006 15:59:11 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017A7F@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> Date: Tue, 12 Dec 2006 15:59:11 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2006 20:59:48 -0000 Status: RO Content-Length: 7152 Ali, I am confused. What does it mean to say "at the UNI you decide ... [and] you also decide at the UNI ..." if it does not mean that the network operator determines these things a priori and configures the equipment accordingly. If there is a requirement for configuration - possibly on an interface-by-interface basis - how is that plug and play? -- Eric > -----Original Message----- > From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] > Sent: Thursday, December 07, 2006 11:48 PM > To: Gray, Eric; Don Fedyk; Joe Touch > Cc: Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Gray, > > With respect to plug-and-play operation, it is similar to 802.1Q or > 802.1ad operation; where, at the UNI you decide which interfaces belong > to which VLANs in case of 802.1Q or which <interface, VLAN> pair belong > to S-tag in case of 802.1ad (e.g., point-to-cloud config model). In case > of 802.1ah, you also decide at the UNI which interfaces or which > <interface, vlan> pair belong to which <B-tag, I-SID> pair. Again the > model in 802.1ah is point-to-cloud model just like 802.1Q and 802.1ad > and that's what makes it plug-and-play. > > -Ali > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Sent: Thursday, December 07, 2006 5:38 AM > > To: Don Fedyk; Joe Touch; Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge. > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Don, > > > > Thanks for doing this. As you can probably attest, > > this is a non-trivial "digging" task to come up with this > > level of detail. I am not sure why Joe asked for it, but now > > that you have provided it, perhaps you can explain how values > > would be derived for the B-TAG TCI/VID and I-TAG TCI/SID > > fields if we'd like to deploy this technology in > "plug-and-play" mode? > > > > -- > > Eric > > > > > -----Original Message----- > > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > > Sent: Thursday, December 07, 2006 8:29 AM > > > To: Joe Touch; Ali Sajassi (sajassi) > > > Cc: Gray, Eric; Developing a hybrid router/bridge. > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > Hi > > > > > > This is the Provider Backbone Header Format reproduced from > > one of the > > > 802.1ah documents. When I said this is similar to the > Trill header > > > this is the version I mentioned. I converted to > > textographics by hand > > > so I hope I got it right. I put field designators in [] > inside the > > > picture for fear they would get wrapped. The encapsulated > > frame starts > > > after the I-TAG I-SID. > > > > > > > > > | 1 | 2 | 3 | 4 > > > | > > > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > -2 | | > > | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > + > > > 2 | Backbone Destination Address > > [B-DA] | > > > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > 6 | Backbone Source Address > > [B-SA] | > > > + > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > 10 | | .1ad Ethertype > > [B-TAG] | > > > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > 14 | .1ad B-TAG TCI/VID | .1ah Ethertype [ > > ] | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ > > I ]-+-+-+ > > > 18 | .1ah I-TAG TCI/SID [ > > - ] | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ > > T ]-+-+-+ > > > 22 | Customer Destination Address [ > > A ] | > > > + +-+-+-+-+-+-+-+-+-+-+-[ > > G ]-+-+-+ > > > 26 | | [ > > ] | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ [ > > ] + > > > 30 | Customer Source Address [ > > ] | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ > > ]-+-+-+ > > > 34 | Encap Ethertype | [ ] > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > > > > > > .1ah I-TAG TCI > > > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > | P/DE |R1 |R2 | I-SID > > | > > > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > > > P/DE 3 Bits Priority 1 bit Drop Eligible > > > R1 Res1 > > > R2 Res2 > > > > > > a) priority - This 3 bit field carries the customer > > priority (I-PCP) > > > associated with this frame. The provider network operates on the > > > priority associated with the B-TAG. > > > > > > b) drop_eligible - This 1 bit field carries the customer drop > > > eligibility > > > (I-DEI) associated with this frame. The provider network > > operates on > > > the drop eligibility associated with the B-TAG. > > > > > > c) res1 - This 2 bit field is used for any future format > > variations. > > > The > > > res2 > > > field is zero on transmit and is ignored on receipt. > > > > > > d) res2 - This 2 bit field is used for any future format > > variations. > > > The > > > res1 > > > field is zero on transmit and if set on reception the frame is > > > discarded. > > > > > > e) I-SID - This 24 bit field carries the service instance > > identifier > > > associated with this frame. > > > > > > f) encapsulated C-DA - This field carries the 48 bit > > Destination MAC > > > Address for an encapsulated Ethernet frame. > > > > > > g) encapsulated C-SA - This field carries the 48 bit Source MAC > > > Address for an encapsulated Ethernet frame. > > > > > > Regards, > > > Don > > > > > > > > > > -----Original Message----- > > > > From: Joe Touch [mailto:touch@ISI.EDU] > > > > Sent: Wednesday, December 06, 2006 9:53 PM > > > > To: Ali Sajassi (sajassi) > > > > Cc: Fedyk, Don (BL60:1A00); Gray, Eric; Developing a hybrid > > > > router/bridge. > > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > > > I'd really rather someone just posted the header / > fields, rather > > > > than a large document in which that information is buried, if > > > > possible ;-) > > > > > > > > Joe > > > > > > > > Ali Sajassi (sajassi) wrote: > > > > > > > > > >> Can you - or anyone with easy access to the specs - > > > please post an > > > > >> explicit description of 802.1ah header and fields? > > > > > > > > > > I will ask Tony (802.1 chair) to make avail to TRILL WG a > > > > copy of .1ah. > > > > > > > > > > -Ali > > > > > > > > > > > > > > >> Thanks, > > > > >> > > > > >> Joe > > > > >> > > > > >> > > > > > > > > -- > > > > ---------------------------------------- > > > > Joe Touch > > > > Sr. Network Engineer, USAF TSAT Space Segment > > > > > > > > > > > > > > Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBCHCMRN011529 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Tue, 12 Dec 2006 09:12:23 -0800 (PST) Received: from [127.0.0.1] (priras01.isi.edu [128.9.176.219]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kBCHAG6m001363; Tue, 12 Dec 2006 09:10:19 -0800 (PST) Message-ID: <457EE277.4070203@isi.edu> Date: Tue, 12 Dec 2006 09:10:15 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> References: <75B2A84D9323BC4CA3977CF378CE75EB02783424@xmb-sjc-21e.amer.cisco.com> In-Reply-To: <75B2A84D9323BC4CA3977CF378CE75EB02783424@xmb-sjc-21e.amer.cisco.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigA31B8A635A2428A28DF6B246" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 12 Dec 2006 17:12:57 -0000 Status: RO Content-Length: 1532 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigA31B8A635A2428A28DF6B246 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Ali Sajassi (sajassi) wrote: >... >> Can you please describe the header you're considering an=20 >> alternative, e.g, where the current one is: >> [outer ether [6-byte shim] [inner ether [payload]]] >=20 > [outer ether][20-byte IP header][4 or 8 byte L2TPv3/GRE shim] > [inner Ether [payload]] >=20 > The draw back is the additional 20 bytes of IP header but the advantage= > is that you can use the IGP as is :-) That's a fairly large drawback. Also, how might this affect an IP protocol running on links over which rbridge nodes communicate? I.e., don't you have to de-conflict the IP addresses and possibly also the IGP to avoid interference between the two= ? Our system has a shim just inside the outer ether, i.e., using a different ethertype; that effectively forces non-rbridge systems to ignore the packets. Joe --------------enigA31B8A635A2428A28DF6B246 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFfuJ3E5f5cImnZrsRApmDAJwLv4L1zPPrV2OQXTBStDhlbqbC9gCglb9q HsmiLIfj0IvUt+DdylrW+mw= =sPOt -----END PGP SIGNATURE----- --------------enigA31B8A635A2428A28DF6B246-- Received: from nuova-ex1.nuovasystems.com (nuova-ex1.nuovasystems.com [67.91.200.196]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBBFJ8qV020936 for <rbridge@postel.org>; Mon, 11 Dec 2006 07:19:08 -0800 (PST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Date: Mon, 11 Dec 2006 07:19:04 -0800 Message-ID: <34BDD2A93E5FD84594BB230DD6C18EA2D1190A@nuova-ex1.hq.nuovaimpresa.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: Acca3d+h/ZdWE9ruQsGd91u5c6sLWAAADHGQAHV9ZPAAINcLIA== From: "Silvano Gai" <sgai@nuovasystems.com> To: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com>, "Joe Touch" <touch@ISI.EDU> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sgai@nuovasystems.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBBFJ8qV020936 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Mon, 11 Dec 2006 15:19:40 -0000 Status: RO Content-Length: 4525 Ali, Inline: > -----Original Message----- > From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] > Sent: Sunday, December 10, 2006 3:48 PM > To: Silvano Gai; Joe Touch > Cc: Radia.Perlman@sun.com; Don Fedyk; Gray, Eric; Developing a hybrid > router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > Silvano, > > > > > > My comment is that IEEE 802.1ah has no space for both the > > ultimate source/dest and the next hop source/dest. > > > > Yes, it doesn't but if next hop source/dest is needed, it can be derived > through other means as discussed briefly during last IETF meeting. > > > IEEE 802.1ah is designed for multiple enterprises to share a > > common metro backbone. It does a fine job in that area. It > > does not support well an arbitrary intermixing of Bridges and > > Rbridges. > > IEEE 802.1ah is designed to work with a mix of 802.1Q, 802.1ad, and > 802.1ah bridges. > > > > > > In contrast Trill does a fine job in supporting arbitrary > > topologies and mixing of RBridges and Bridges thanks to the > > availability of both the ultimate source/dest and the next > > hop source/dest. > > > > In TRILL the network between the "ingress" and "egress" > > RBridge isn't a single Ethernet (like in 802.1ah), but rather > > a sequence of RBridges that may be connected by Ethernets. > > 802.1ah doesn't assume that the network between ingress and egress edge > bridges is a single Ethernet. It assume a bridged-LAN network (e.g., > 802.1Q network). You are absolutely right, but TRILL does more, it assumes a sequence of RBridges interconnected by bridged-LAN network. -- Silvano > > -Ali > > > > > Things look similar, but are substantially different. > > > > -- Silvano > > > > > > > > > > As per below, if R1 (current rbridge) wants to pick from among > > multiple > > > next-hops R2 and R3, it does so with the outermost ethernet > > header. If > > > they're logical (R2/R3 both on the same NIC), then just assign > > separate > > > ethernet addresses to the same interface. > > > > > > What's left? > > > > > > Joe > > > > > > > > > >> -----Original Message----- > > > >> From: Joe Touch [mailto:touch@ISI.EDU] > > > >> Sent: Thursday, December 07, 2006 11:00 PM > > > >> To: Radia.Perlman@sun.com > > > >> Cc: Ali Sajassi (sajassi); Silvano Gai; Don Fedyk; Gray, Eric; > > > > Developing > > > >> a hybrid router/bridge. > > > >> Subject: Re: [rbridge] Use of 802.1ah Encaps > > > >> > > > >> > > > >> > > > >> Radia.Perlman@sun.com wrote: > > > >>> Travelling again, so extremely limited access to email (as in, > > about > > > > 10 > > > >> minutes here and there > > > >>> on a SLOW connection). Anyway, I'll answer some of these: > > > >>> > > > >>> a) why "next hop" and "previous hop" in addition to "ultimate" > > > > source > > > >> and destination > > > >>> At least one of the reasons is that if there are three > > RBridges on > > > > the > > > >> same link, R1, R2, and R3, > > > >>> it is useful for R1 to choose which of R2 or R3 should > > receive the > > > >> packet. It isn't obvious from > > > >>> the destination address because it could be that either R2 or R3 > > > > would > > > >> be logical, and R1 is > > > >>> load splitting. Also, it helps focus traffic on the link, and > > ensure > > > > it > > > >> doesn't get filtered, if > > > >>> the bridges on the link only need to learn R1, R2, and R3, > > > > especially > > > >> since traffic from outside > > > >>> RBridges might arrive from different entry points onto the link. > > > >> The ultimate destination (and source, for that matter) should be > > > >> sufficiently indicated by the inner ethernet packet. The outer > > header > > > > is > > > >> already hop-by-hop inside the rbridge anyway. What additional > > > >> information is required? > > > >> > > > >> The next/previous hop information sounds like a source > > route with > > > >> record-route option. While that's useful for debugging, > > it doesn't > > > > seem > > > >> necessary. > > > >> > > > >>> b) congestion management was explained to us, and it was what > > > > convinced > > > >> us we needed "ultimate > > > >>> source RBridge" in order to know where to send the congestion > > > >> notification. If you could explain the > > > >>> other things, we could see if there is a problem, but > > if they are > > > >> similar to congestion notification, then > > > >>> having the ingress RBridge will accommodate them. > > > >> Why doesn't the source ethernet address indicate this already? > > > >> > > > >> Joe > > > > > > Received: from sj-iport-5.cisco.com (sj-iport-5.cisco.com [171.68.10.87]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBB9IAmP028115 for <rbridge@postel.org>; Mon, 11 Dec 2006 01:18:10 -0800 (PST) Received: from sj-dkim-4.cisco.com ([171.71.179.196]) by sj-iport-5.cisco.com with ESMTP; 11 Dec 2006 01:18:10 -0800 Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-4.cisco.com (8.12.11/8.12.11) with ESMTP id kBB9I9ln024231; Mon, 11 Dec 2006 01:18:09 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id kBB9I5in010564; Mon, 11 Dec 2006 01:18:05 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Mon, 11 Dec 2006 01:18:04 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Mon, 11 Dec 2006 01:18:03 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB02783424@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: Accc8WKRoMMtFT/ZQtSST/Hp+9d7EwAErUTg From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Joe Touch" <touch@ISI.EDU> X-OriginalArrivalTime: 11 Dec 2006 09:18:04.0906 (UTC) FILETIME=[43926CA0:01C71D05] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=3053; t=1165828689; x=1166692689; c=relaxed/simple; s=sjdkim4002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=UHKAkk6/1xRee3OkHYP9eBzE5RR3teo0HZB0iwlbIbs=; b=bz+dAoTCpc7r76Hku1l9Ht6NN0I3MehAJVccIAmmf4xcDvISTn5bmeNFrAVtbmPNeAQAx5u+ ac3+6zLAtYg20UaC+w7NGRD0VI2l8Pimtez/vg989J3MWfgaca6Vx5yd; Authentication-Results: sj-dkim-4; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim4002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBB9IAmP028115 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Mon, 11 Dec 2006 09:18:27 -0000 Status: RO Content-Length: 2898 > -----Original Message----- > From: Joe Touch [mailto:touch@ISI.EDU] > Sent: Sunday, December 10, 2006 10:56 PM > To: Ali Sajassi (sajassi) > Cc: Silvano Gai; Radia.Perlman@sun.com; Don Fedyk; Gray, > Eric; Developing a hybrid router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > Ali Sajassi (sajassi) wrote: > > > > > >> -----Original Message----- > >> From: Joe Touch [mailto:touch@ISI.EDU] > >> Sent: Friday, December 08, 2006 7:29 AM > >> To: Silvano Gai > >> Cc: Radia.Perlman@sun.com; Ali Sajassi (sajassi); Don Fedyk; Gray, > >> Eric; Developing a hybrid router/bridge. > >> Subject: Re: [rbridge] Use of 802.1ah Encaps > >> > >> > >> > >> Silvano Gai wrote: > >>> Joe, > >>> > >>> TRILL will never scale if you mandate to keep the > >> forwarding table for > >>> the inner addresses on all RBridges, especially in a IEEE 802.1ah > >>> environment!!! > >> Sorry; let me backup: > >> > >> Here's where we were at the last IETF: > >> > >> - the shim indicates the source (ingress) and dest (egress) > >> (originally this was just dest for unicast, source for mcast > >> but we agreed in San Diego to include both) > >> i.e., agreed with the point above; those are the > >> addresses on which packets are forwarded > >> > >> the ultimate source is indicated in the shim already > >> > >> - the outer header already indicates the previous/next-hop rbridge > >> > >> What's the reason for needing any further information? > >> > >> As per below, if R1 (current rbridge) wants to pick from among > >> multiple next-hops R2 and R3, it does so with the > outermost Ethernet > >> header. If they're logical (R2/R3 both on the same NIC), then just > >> assign separate ethernet addresses to the same interface. > >> > >> What's left? > > > > If the outer Ethernet addresses represent the link Ether > addresses for > > the current/next-hop rbriges and the shim header represent the > > source/dest rbridge addresses, then why not just do IP encap using > > L2TPv3/GRE and be done with !! > > Can you please describe the header you're considering an > alternative, e.g, where the current one is: > [outer ether [6-byte shim] [inner ether [payload]]] > [outer ether][20-byte IP header][4 or 8 byte L2TPv3/GRE shim] [inner Ether [payload]] The draw back is the additional 20 bytes of IP header but the advantage is that you can use the IGP as is :-) > The above adds 20 bytes (14 outer ether + 6 byte shim), and > allows TTL management inside the rbridge without affecting > the payload TTL (required for correct operation). > > I'm not exactly sure what you mean you L2TPv3/GRE, but I'm > wondering if that comes out to 42 bytes of header, and > whether it provides an L2 solution. It is an L2 solution. I did a draft on it long time ago in context of L2VPN: http://ietfreport.isoc.org/idref/draft-sajassi-mvpls/ -Ali > > Joe > > > Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBB6tvnJ021304 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Sun, 10 Dec 2006 22:55:57 -0800 (PST) Received: from [127.0.0.1] (pool-71-106-94-15.lsanca.dsl-w.verizon.net [71.106.94.15]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kBB6tXLi001984; Sun, 10 Dec 2006 22:55:34 -0800 (PST) Message-ID: <457D00E4.7070906@isi.edu> Date: Sun, 10 Dec 2006 22:55:32 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> References: <75B2A84D9323BC4CA3977CF378CE75EB027833A8@xmb-sjc-21e.amer.cisco.com> In-Reply-To: <75B2A84D9323BC4CA3977CF378CE75EB027833A8@xmb-sjc-21e.amer.cisco.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig170CAF71959D1A15411B6140" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Mon, 11 Dec 2006 06:56:21 -0000 Status: RO Content-Length: 2843 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig170CAF71959D1A15411B6140 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Ali Sajassi (sajassi) wrote: > =20 >=20 >> -----Original Message----- >> From: Joe Touch [mailto:touch@ISI.EDU]=20 >> Sent: Friday, December 08, 2006 7:29 AM >> To: Silvano Gai >> Cc: Radia.Perlman@sun.com; Ali Sajassi (sajassi); Don Fedyk;=20 >> Gray, Eric; Developing a hybrid router/bridge. >> Subject: Re: [rbridge] Use of 802.1ah Encaps >> >> >> >> Silvano Gai wrote: >>> Joe, >>> >>> TRILL will never scale if you mandate to keep the=20 >> forwarding table for=20 >>> the inner addresses on all RBridges, especially in a IEEE 802.1ah=20 >>> environment!!! >> Sorry; let me backup: >> >> Here's where we were at the last IETF: >> >> - the shim indicates the source (ingress) and dest (egress) >> (originally this was just dest for unicast, source for mcast >> but we agreed in San Diego to include both) >> i.e., agreed with the point above; those are the >> addresses on which packets are forwarded >> >> the ultimate source is indicated in the shim already >> >> - the outer header already indicates the previous/next-hop rbridge >> >> What's the reason for needing any further information? >> >> As per below, if R1 (current rbridge) wants to pick from=20 >> among multiple next-hops R2 and R3, it does so with the=20 >> outermost Ethernet header. If they're logical (R2/R3 both on=20 >> the same NIC), then just assign separate ethernet addresses=20 >> to the same interface. >> >> What's left? >=20 > If the outer Ethernet addresses represent the link Ether addresses for > the current/next-hop rbriges and the shim header represent the > source/dest rbridge addresses, then why not just do IP encap using > L2TPv3/GRE and be done with !! Can you please describe the header you're considering an alternative, e.g, where the current one is: [outer ether [6-byte shim] [inner ether [payload]]] The above adds 20 bytes (14 outer ether + 6 byte shim), and allows TTL management inside the rbridge without affecting the payload TTL (required for correct operation). I'm not exactly sure what you mean you L2TPv3/GRE, but I'm wondering if that comes out to 42 bytes of header, and whether it provides an L2 solution. Joe --------------enig170CAF71959D1A15411B6140 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFfQDkE5f5cImnZrsRAtA8AJ4pKzvyEozcbjM4wXJ5FeAjsxcyNQCfQ6D7 chajYPinvCk0+VAEkGRBAZE= =7Ges -----END PGP SIGNATURE----- --------------enig170CAF71959D1A15411B6140-- Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBANmNJK004751 for <rbridge@postel.org>; Sun, 10 Dec 2006 15:48:23 -0800 (PST) Received: from sj-dkim-6.cisco.com ([171.68.10.81]) by sj-iport-4.cisco.com with ESMTP; 10 Dec 2006 15:48:23 -0800 Received: from sj-core-4.cisco.com (sj-core-4.cisco.com [171.68.223.138]) by sj-dkim-6.cisco.com (8.12.11/8.12.11) with ESMTP id kBANmMIc028987; Sun, 10 Dec 2006 15:48:22 -0800 Received: from xbh-sjc-221.amer.cisco.com (xbh-sjc-221.cisco.com [128.107.191.63]) by sj-core-4.cisco.com (8.12.10/8.12.6) with ESMTP id kBANmMOV024786; Sun, 10 Dec 2006 15:48:22 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-221.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Sun, 10 Dec 2006 15:48:20 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Sun, 10 Dec 2006 15:48:19 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB027833A9@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: Acca3d+h/ZdWE9ruQsGd91u5c6sLWAAADHGQAHV9ZPA= From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Silvano Gai" <sgai@nuovasystems.com>, "Joe Touch" <touch@ISI.EDU> X-OriginalArrivalTime: 10 Dec 2006 23:48:20.0375 (UTC) FILETIME=[AC00F270:01C71CB5] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=4059; t=1165794503; x=1166658503; c=relaxed/simple; s=sjdkim6002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=3jFtodCKINHHf9Me8lEBWq93aH284PiGG1HESPISIf8=; b=AAvKyoktZpguNr6zuN9WDNJpr4DhKT2Fm1sIcT/3H13fLSbKBpMGggW4SoJ5hsFKJ70qfN36 4iggrNw9sdUp41/j3VxmxwcTxg4kJ+6zBL68HUq/IEnbRDwd9dXuv0kN; Authentication-Results: sj-dkim-6; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim6002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBANmNJK004751 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Sun, 10 Dec 2006 23:48:55 -0000 Status: RO Content-Length: 3866 Silvano, > > My comment is that IEEE 802.1ah has no space for both the > ultimate source/dest and the next hop source/dest. > Yes, it doesn't but if next hop source/dest is needed, it can be derived through other means as discussed briefly during last IETF meeting. > IEEE 802.1ah is designed for multiple enterprises to share a > common metro backbone. It does a fine job in that area. It > does not support well an arbitrary intermixing of Bridges and > Rbridges. IEEE 802.1ah is designed to work with a mix of 802.1Q, 802.1ad, and 802.1ah bridges. > > In contrast Trill does a fine job in supporting arbitrary > topologies and mixing of RBridges and Bridges thanks to the > availability of both the ultimate source/dest and the next > hop source/dest. > > In TRILL the network between the "ingress" and "egress" > RBridge isn't a single Ethernet (like in 802.1ah), but rather > a sequence of RBridges that may be connected by Ethernets. 802.1ah doesn't assume that the network between ingress and egress edge bridges is a single Ethernet. It assume a bridged-LAN network (e.g., 802.1Q network). -Ali > > Things look similar, but are substantially different. > > -- Silvano > > > > > > As per below, if R1 (current rbridge) wants to pick from among > multiple > > next-hops R2 and R3, it does so with the outermost ethernet > header. If > > they're logical (R2/R3 both on the same NIC), then just assign > separate > > ethernet addresses to the same interface. > > > > What's left? > > > > Joe > > > > > > >> -----Original Message----- > > >> From: Joe Touch [mailto:touch@ISI.EDU] > > >> Sent: Thursday, December 07, 2006 11:00 PM > > >> To: Radia.Perlman@sun.com > > >> Cc: Ali Sajassi (sajassi); Silvano Gai; Don Fedyk; Gray, Eric; > > > Developing > > >> a hybrid router/bridge. > > >> Subject: Re: [rbridge] Use of 802.1ah Encaps > > >> > > >> > > >> > > >> Radia.Perlman@sun.com wrote: > > >>> Travelling again, so extremely limited access to email (as in, > about > > > 10 > > >> minutes here and there > > >>> on a SLOW connection). Anyway, I'll answer some of these: > > >>> > > >>> a) why "next hop" and "previous hop" in addition to "ultimate" > > > source > > >> and destination > > >>> At least one of the reasons is that if there are three > RBridges on > > > the > > >> same link, R1, R2, and R3, > > >>> it is useful for R1 to choose which of R2 or R3 should > receive the > > >> packet. It isn't obvious from > > >>> the destination address because it could be that either R2 or R3 > > > would > > >> be logical, and R1 is > > >>> load splitting. Also, it helps focus traffic on the link, and > ensure > > > it > > >> doesn't get filtered, if > > >>> the bridges on the link only need to learn R1, R2, and R3, > > > especially > > >> since traffic from outside > > >>> RBridges might arrive from different entry points onto the link. > > >> The ultimate destination (and source, for that matter) should be > > >> sufficiently indicated by the inner ethernet packet. The outer > header > > > is > > >> already hop-by-hop inside the rbridge anyway. What additional > > >> information is required? > > >> > > >> The next/previous hop information sounds like a source > route with > > >> record-route option. While that's useful for debugging, > it doesn't > > > seem > > >> necessary. > > >> > > >>> b) congestion management was explained to us, and it was what > > > convinced > > >> us we needed "ultimate > > >>> source RBridge" in order to know where to send the congestion > > >> notification. If you could explain the > > >>> other things, we could see if there is a problem, but > if they are > > >> similar to congestion notification, then > > >>> having the ingress RBridge will accommodate them. > > >> Why doesn't the source ethernet address indicate this already? > > >> > > >> Joe > > > > Received: from sj-iport-3.cisco.com (sj-iport-3-in.cisco.com [171.71.176.72]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBANYG75000519 for <rbridge@postel.org>; Sun, 10 Dec 2006 15:34:16 -0800 (PST) Received: from sj-dkim-2.cisco.com ([171.71.179.186]) by sj-iport-3.cisco.com with ESMTP; 10 Dec 2006 15:34:16 -0800 X-IronPort-AV: i="4.09,518,1157353200"; d="scan'208"; a="450395495:sNHT55122544" Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id kBANYGVv027137; Sun, 10 Dec 2006 15:34:16 -0800 Received: from xbh-sjc-221.amer.cisco.com (xbh-sjc-221.cisco.com [128.107.191.63]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id kBANYGin007357; Sun, 10 Dec 2006 15:34:16 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-221.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Sun, 10 Dec 2006 15:34:15 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Sun, 10 Dec 2006 15:34:14 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB027833A8@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: Acca3Zp2gEQNEsOpQzu3wj1DUnvoQQB1XSYQ From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Joe Touch" <touch@ISI.EDU>, "Silvano Gai" <sgai@nuovasystems.com> X-OriginalArrivalTime: 10 Dec 2006 23:34:15.0818 (UTC) FILETIME=[B49BC6A0:01C71CB3] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=3977; t=1165793656; x=1166657656; c=relaxed/simple; s=sjdkim2002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=3ROAikMWGXtJn1K2HNa7C3UGLLIw7cCc0b/ZixkBLac=; b=voILSfXex1OmoeLrDR5B/tujCMCOwKx5h8Zc+7JxS4z8XlsiI8sQIfx44SCwwYSJN5R7b08R enZIDs6pDYNJtDQDeX8McbYNpRY6p0oMAvLAyXk7VoaCRbiovODwqUoZ; Authentication-Results: sj-dkim-2; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim2002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBANYG75000519 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Sun, 10 Dec 2006 23:34:38 -0000 Status: RO Content-Length: 3792 > -----Original Message----- > From: Joe Touch [mailto:touch@ISI.EDU] > Sent: Friday, December 08, 2006 7:29 AM > To: Silvano Gai > Cc: Radia.Perlman@sun.com; Ali Sajassi (sajassi); Don Fedyk; > Gray, Eric; Developing a hybrid router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > Silvano Gai wrote: > > Joe, > > > > TRILL will never scale if you mandate to keep the > forwarding table for > > the inner addresses on all RBridges, especially in a IEEE 802.1ah > > environment!!! > > Sorry; let me backup: > > Here's where we were at the last IETF: > > - the shim indicates the source (ingress) and dest (egress) > (originally this was just dest for unicast, source for mcast > but we agreed in San Diego to include both) > i.e., agreed with the point above; those are the > addresses on which packets are forwarded > > the ultimate source is indicated in the shim already > > - the outer header already indicates the previous/next-hop rbridge > > What's the reason for needing any further information? > > As per below, if R1 (current rbridge) wants to pick from > among multiple next-hops R2 and R3, it does so with the > outermost Ethernet header. If they're logical (R2/R3 both on > the same NIC), then just assign separate ethernet addresses > to the same interface. > > What's left? If the outer Ethernet addresses represent the link Ether addresses for the current/next-hop rbriges and the shim header represent the source/dest rbridge addresses, then why not just do IP encap using L2TPv3/GRE and be done with !! -Ali > > Joe > > > >> -----Original Message----- > >> From: Joe Touch [mailto:touch@ISI.EDU] > >> Sent: Thursday, December 07, 2006 11:00 PM > >> To: Radia.Perlman@sun.com > >> Cc: Ali Sajassi (sajassi); Silvano Gai; Don Fedyk; Gray, Eric; > > Developing > >> a hybrid router/bridge. > >> Subject: Re: [rbridge] Use of 802.1ah Encaps > >> > >> > >> > >> Radia.Perlman@sun.com wrote: > >>> Travelling again, so extremely limited access to email > (as in, about > > 10 > >> minutes here and there > >>> on a SLOW connection). Anyway, I'll answer some of these: > >>> > >>> a) why "next hop" and "previous hop" in addition to "ultimate" > > source > >> and destination > >>> At least one of the reasons is that if there are three RBridges on > > the > >> same link, R1, R2, and R3, > >>> it is useful for R1 to choose which of R2 or R3 should receive the > >> packet. It isn't obvious from > >>> the destination address because it could be that either R2 or R3 > > would > >> be logical, and R1 is > >>> load splitting. Also, it helps focus traffic on the link, > and ensure > > it > >> doesn't get filtered, if > >>> the bridges on the link only need to learn R1, R2, and R3, > > especially > >> since traffic from outside > >>> RBridges might arrive from different entry points onto the link. > >> The ultimate destination (and source, for that matter) should be > >> sufficiently indicated by the inner ethernet packet. The > outer header > > is > >> already hop-by-hop inside the rbridge anyway. What additional > >> information is required? > >> > >> The next/previous hop information sounds like a source route with > >> record-route option. While that's useful for debugging, it doesn't > > seem > >> necessary. > >> > >>> b) congestion management was explained to us, and it was what > > convinced > >> us we needed "ultimate > >>> source RBridge" in order to know where to send the congestion > >> notification. If you could explain the > >>> other things, we could see if there is a problem, but if they are > >> similar to congestion notification, then > >>> having the ingress RBridge will accommodate them. > >> Why doesn't the source ethernet address indicate this already? > >> > >> Joe > > > > Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBANOwNV027733 for <rbridge@postel.org>; Sun, 10 Dec 2006 15:24:58 -0800 (PST) Received: from sj-dkim-3.cisco.com ([171.71.179.195]) by sj-iport-4.cisco.com with ESMTP; 10 Dec 2006 15:24:55 -0800 Received: from sj-core-1.cisco.com (sj-core-1.cisco.com [171.71.177.237]) by sj-dkim-3.cisco.com (8.12.11/8.12.11) with ESMTP id kBANOtb8015284; Sun, 10 Dec 2006 15:24:55 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id kBANOnio009017; Sun, 10 Dec 2006 15:24:53 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Sun, 10 Dec 2006 15:24:49 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Sun, 10 Dec 2006 15:24:48 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB027833A7@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaGTxqeIHHWDcIQWGQhzE+3h7UCAAA3x4gABBjVuAAChq0YAAUtH2gAHXVX0A= From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Silvano Gai" <sgai@nuovasystems.com>, "Don Fedyk" <dwfedyk@nortel.com>, "Gray, Eric" <Eric.Gray@marconi.com> X-OriginalArrivalTime: 10 Dec 2006 23:24:49.0414 (UTC) FILETIME=[63016260:01C71CB2] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=3707; t=1165793095; x=1166657095; c=relaxed/simple; s=sjdkim3002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=ca28kEn5Oo3mIslzeOxT7fmpim8C8FTlIo/JOa9Cc74=; b=fpdMcxstNyuzPzh3/4kVBdn3MXf02Tjy6kVthfID1HzeWfbE2Jsne1+LaZ/8ifua1A3Hkh4b /mcPnRxdisgUkNo1Qw2VOXU+GAjIcPd8oRXQ+1IY7s8grH2/28BTC6sH; Authentication-Results: sj-dkim-3; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim3002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBANOwNV027733 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Sun, 10 Dec 2006 23:25:16 -0000 Status: RO Content-Length: 3545 Hi Silvano, > > > > > 3) Many unneeded fields and therefore larger frame overhead. > > > > > > > Such as ? > > The I-tag is not useful in TRILL and in contrast two > addresses and the TTL are missing. I-tag my not be useful in data-center applications but it is useful in large Enterprise applications. I acknowledge that TTL is missing but if needed we (at IEEE) can try to accommodate it. And by two addresses, if you mean next hop addresses, then those can be inferred by B-MAC addresses (and possibly B-VLAN if needed) in .1ah encap. -Ali > > > > > > The advantages are: > > > 1) Larger addressable market for TRILL > > > > > > IMO if we stick with the WG charter the disadvantages clearly > > > outweigh the advantages. > > > > > > The WG can be re-chartered, but if we consider the Enterprise and > > > Data Center market, IEEE 802.1ah is an overkill. > > > > > > > If by overkill you mean a bit bigger header, then I agree > but look at > > all the other advantages that you get from using standard > IEEE header > > and shim including: > > - security Mgmt: MACSec/KeySec > > - Congestion Mgmt > > - Connectivity Fault Mgmt > > > > Has it been considered how these are going to work with TRILL shim > > header or are these outside of WG charter :-) > > > > -Ali > > > > > > > -- Silvano > > > > > > > > > > -----Original Message----- > > > > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] > > > On > > > > Behalf Of Don Fedyk > > > > Sent: Thursday, December 07, 2006 9:21 AM > > > > To: Gray, Eric; Ali Sajassi (sajassi) > > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > > > Hi Eric > > > > > > > > > -----Original Message----- > > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > > > > > Don, > > > > > > > > > > And yet, someone (Ali Sajassi) asserted (in his message > > > dated Wed > > > > > 12/6/2006 at 2:16 PM EST) that there were no issues or > additional > > > > > complications with using 802.1ah in enterprises for > plug-and-play > > > > > applicability. > > > > > > > > > > Perhaps Ali can answer my question then. > > > > > > > > > > But, to more directly address your earlier comments: > > > > > > > > > > The TRILL WG has NOT come up with an encapsulation that > "looks > > > > > like" 802.1ah - unless someone squints really hard > and tries to > > > > > pretend that two separate Ethernet encapsulations - > > > separated by a > > > > > SHIM header - are one single encapsulation. > > > > > > > > To be fair Point to Point header that was discussed without > > > one of the > > > > shims was very close "functionally" (colloquial looks like) to > > > 802.1ah. > > > > My opinion is still we don't need several variations of > > > headers doing > > > > similar things. > > > > > > > > This was the slide that looked a lot like what I posted. > > > > > > > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > > > > > > > Regards, > > > > Don > > > > > > > > > > That is not to say that the WG has done anything that > > > could be said > > > > > to disallow the use of 802.1ah encapsulation. > > > > > It is just not obviously consistent with all of the WG > > > goals to use > > > > > _only_ 802.1ah encapsulation. > > > > > > > > > > -- > > > > > Eric > > > > > > > > > > > > > _______________________________________________ > > > > rbridge mailing list > > > > rbridge@postel.org > > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > Received: from sj-iport-6.cisco.com (sj-iport-6.cisco.com [171.71.176.117]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kBAN703m021920 for <rbridge@postel.org>; Sun, 10 Dec 2006 15:07:00 -0800 (PST) Received: from sj-dkim-4.cisco.com ([171.71.179.196]) by sj-iport-6.cisco.com with ESMTP; 10 Dec 2006 15:07:00 -0800 X-IronPort-AV: i="4.09,518,1157353200"; d="scan'208"; a="90099951:sNHT60097374" Received: from sj-core-1.cisco.com (sj-core-1.cisco.com [171.71.177.237]) by sj-dkim-4.cisco.com (8.12.11/8.12.11) with ESMTP id kBAN6xIb024158; Sun, 10 Dec 2006 15:06:59 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id kBAN6xio024706; Sun, 10 Dec 2006 15:06:59 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Sun, 10 Dec 2006 15:06:58 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Sun, 10 Dec 2006 15:06:58 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB027833A5@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccajZKze/CX8hUBQkuXDtSDZ3KzjACHxnEw From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: <Radia.Perlman@sun.com> X-OriginalArrivalTime: 10 Dec 2006 23:06:58.0988 (UTC) FILETIME=[E4FB56C0:01C71CAF] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=7687; t=1165792020; x=1166656020; c=relaxed/simple; s=sjdkim4002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=EStjti5/lY3E1fpjKLYHv7TmIqXdoIS8PDUQkdICxS4=; b=my9Dys2vrlkuvJAVoUuJgZ9c4wBjyrgFG7LrRiLBRz3EI+Rrla8XVY8+wJbLhBDDU5TrZzUe +cf+kMY+jRAlooJGnXLcQFzAoR+GhEbCLZgUbTgVxSh07mL7URKCaXpb; Authentication-Results: sj-dkim-4; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim4002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kBAN703m021920 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Sun, 10 Dec 2006 23:07:25 -0000 Status: RO Content-Length: 7315 > -----Original Message----- > From: Radia.Perlman@sun.com [mailto:Radia.Perlman@sun.com] > Sent: Thursday, December 07, 2006 9:56 PM > To: Ali Sajassi (sajassi) > Cc: Silvano Gai; Don Fedyk; Gray, Eric; Developing a hybrid > router/bridge.; Joe Touch > Subject: Re: [rbridge] Use of 802.1ah Encaps > > Travelling again, so extremely limited access to email (as > in, about 10 minutes here and there on a SLOW connection). > Anyway, I'll answer some of these: Also sorry for not being able to respond to your email earlier due to my schedule/meetings (specially on Friday). > > a) why "next hop" and "previous hop" in addition to > "ultimate" source and destination > > At least one of the reasons is that if there are three > RBridges on the same link, R1, R2, and R3, it is useful for > R1 to choose which of R2 or R3 should receive the packet. It > isn't obvious from the destination address because it could > be that either R2 or R3 would be logical, and R1 is load > splitting. Also, it helps focus traffic on the link, and > ensure it doesn't get filtered, if the bridges on the link > only need to learn R1, R2, and R3, especially since traffic > from outside RBridges might arrive from different entry > points onto the link. O.K., I remember now the discussion that we had during the IETF meeting on load balancing and next hop address. However, there are couple of ways for achieving the same result. I mentioned briefly during the meeting the use of VLAN for this purpose and someone else mentioned using part of 48-bit provider MAC address for this purpose. > > b) congestion management was explained to us, and it was what > convinced us we needed "ultimate source RBridge" in order to > know where to send the congestion notification. If you could > explain the other things, we could see if there is a problem, > but if they are similar to congestion notification, then > having the ingress RBridge will accommodate them. > With respect to CFM, connectivity fault mgmt is done in a hierarchical way and it can be performed at the provider service instance level (e.g., on a per I-SID basis) or it can be performed for group of I-SIDs on a per B-VLAN level. In both cases, provider MAC addresses are used which makes the provider OAM control for customer data-traffic very tight. You cannot get the same result by using OAM messages that use customer MAC addresses and if you try to do it will be very cumbersome. Basically what I am trying to point out is that by using non-IEEE conformance frame format, you assume the responsibility for all the features developed by IEEE; where as, if you use IEEE conformant frame, then one can concentrate on the control plane issues which I thought was the main objective of TRILL. -Ali > Sorry for ignoring all the other messages for now, but I only > had a chance to read and respond to one message. > > Radia > > ----- Original Message ----- > From: "Ali Sajassi (sajassi)" <sajassi@cisco.com> > Date: Friday, December 8, 2006 10:53 am > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > Silvano, > > > > > -----Original Message----- > > > From: Silvano Gai [sgai@nuovasystems.com] > > > Sent: Thursday, December 07, 2006 5:36 PM > > > To: Don Fedyk; Gray, Eric; Ali Sajassi (sajassi) > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > > > > IMO it is technically possible for TRILL to adopt IEEE 802.1ah. > > > There are advantages and disadvantages. > > > > > > The disadvantages are: > > > 1) Lack of Next-Hop addresses. We discussed this at length during > > > the last meeting and we didn't reach consensus on a way > to eliminate > > > them. > > > > Can you refresh my memory for why we need a next-hop > address when the > > header carries both source and destination PE addresses and > when these > > addresses are learned in control plane ? > > > > > 2) Lack of a TTL field (it may be added, but it is not > there today). > > > > Can probably be accommodated. > > > > > 3) Many unneeded fields and therefore larger frame overhead. > > > > > > > Such as ? > > > > > The advantages are: > > > 1) Larger addressable market for TRILL > > > > > > IMO if we stick with the WG charter the disadvantages clearly > > > outweigh the advantages. > > > > > > The WG can be re-chartered, but if we consider the Enterprise and > > > Data Center market, IEEE 802.1ah is an overkill. > > > > > > > If by overkill you mean a bit bigger header, then I agree > but look at > > all the other advantages that you get from using standard > IEEE header > > and shim including: > > - security Mgmt: MACSec/KeySec > > - Congestion Mgmt > > - Connectivity Fault Mgmt > > > > Has it been considered how these are going to work with TRILL shim > > header or are these outside of WG charter :-) > > > > -Ali > > > > > > > -- Silvano > > > > > > > > > > -----Original Message----- > > > > From: rbridge-bounces@postel.org [rbridge-bounces@postel.org] > > > On > > > > Behalf Of Don Fedyk > > > > Sent: Thursday, December 07, 2006 9:21 AM > > > > To: Gray, Eric; Ali Sajassi (sajassi) > > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > > > Hi Eric > > > > > > > > > -----Original Message----- > > > > > From: Gray, Eric [Eric.Gray@marconi.com] > > > > > > > > > > Don, > > > > > > > > > > And yet, someone (Ali Sajassi) asserted (in his message > > > dated Wed > > > > > 12/6/2006 at 2:16 PM EST) that there were no issues or > > additional > > > > > complications with using 802.1ah in enterprises for plug-and- > > play > > > > > applicability. > > > > > > > > > > Perhaps Ali can answer my question then. > > > > > > > > > > But, to more directly address your earlier comments: > > > > > > > > > > The TRILL WG has NOT come up with an encapsulation that > > "looks > > > > > like" 802.1ah - unless someone squints really hard and tries > > to > > > > > pretend that two separate Ethernet encapsulations - > > > separated by a > > > > > SHIM header - are one single encapsulation. > > > > > > > > To be fair Point to Point header that was discussed without > > > one of the > > > > shims was very close "functionally" (colloquial looks like) to > > > 802.1ah. > > > > My opinion is still we don't need several variations of > > > headers doing > > > > similar things. > > > > > > > > This was the slide that looked a lot like what I posted. > > > > > > > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > > > > > > > Regards, > > > > Don > > > > > > > > > > That is not to say that the WG has done anything that > > > could be said > > > > > to disallow the use of 802.1ah encapsulation. > > > > > It is just not obviously consistent with all of the WG > > > goals to use > > > > > _only_ 802.1ah encapsulation. > > > > > > > > > > -- > > > > > Eric > > > > > > > > > > > > > _______________________________________________ > > > > rbridge mailing list > > > > rbridge@postel.org > > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > Received: from mail-mta.sunlabs.com (edge.sunlabs.com [204.153.12.50]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB8JPPNs011106 for <rbridge@postel.org>; Fri, 8 Dec 2006 11:25:26 -0800 (PST) Received: from sml-sfvt3a.sfvic.sunlabs.com ([152.70.2.254]) by dps.sfvic.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTP id <0J9Y00D2AZA9DM10@dps.sfvic.sunlabs.com> for rbridge@postel.org; Fri, 08 Dec 2006 11:25:21 -0800 (PST) Received: from sunlabs.com ([152.70.2.254]) by mail-srv.sfvic.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTP id <0J9Y00KQ9ZA9OM40@mail-srv.sfvic.sunlabs.com> for rbridge@postel.org; Fri, 08 Dec 2006 11:25:21 -0800 (PST) Received: from [152.70.2.164] (Forwarded-For: [59.92.0.181]) by mail-srv.sfvic.sunlabs.com (mshttpd); Sat, 09 Dec 2006 00:25:21 +0500 Date: Sat, 09 Dec 2006 00:25:21 +0500 From: Radia.Perlman@sun.com To: Joe Touch <touch@ISI.EDU> Message-id: <881865d13f9.457a0271@sunlabs.com> MIME-version: 1.0 X-Mailer: Sun Java(tm) System Messenger Express 6.1 HotFix 0.02 (built Aug 25 2004) Content-type: multipart/mixed; boundary="Boundary_(ID_0zLyy4776RHzIzxp530jZA)" Content-language: en X-Accept-Language: en Priority: normal X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: radia.perlman@sun.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 19:25:43 -0000 Status: RO Content-Length: 2710 This is a multi-part message in MIME format. --Boundary_(ID_0zLyy4776RHzIzxp530jZA) Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Content-disposition: inline There's 3 sets of addresses: a) original frame: endnode source and destination MACs. b) shim: ingress and egress RBridges c) outer: next hop, previous hop. Forwarding is to egress RBridge in order to make RBridges inside not have to know about all the endnodes, especially in VLANs they are not connected to. So forwarding by Rbridges between the ingress and egress is solely by "egress RBridge", not by the source/destination in the inner frame Outer header (nxt hop/previous hop) is for shared media....if there's a cloud in the middle with multiple nodes, including multiple RBridges, the "next hop" lets any bridges on that cloud know where to send it, and won't have them fallaciously filtering. Radia --Boundary_(ID_0zLyy4776RHzIzxp530jZA) Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: 7BIT Radia.Perlman@sun.com wrote: > Travelling again, so extremely limited access to email (as in, about 10 minutes here and there > on a SLOW connection). Anyway, I'll answer some of these: > > a) why "next hop" and "previous hop" in addition to "ultimate" source and destination > > At least one of the reasons is that if there are three RBridges on the same link, R1, R2, and R3, > it is useful for R1 to choose which of R2 or R3 should receive the packet. It isn't obvious from > the destination address because it could be that either R2 or R3 would be logical, and R1 is > load splitting. Also, it helps focus traffic on the link, and ensure it doesn't get filtered, if > the bridges on the link only need to learn R1, R2, and R3, especially since traffic from outside > RBridges might arrive from different entry points onto the link. The ultimate destination (and source, for that matter) should be sufficiently indicated by the inner ethernet packet. The outer header is already hop-by-hop inside the rbridge anyway. What additional information is required? The next/previous hop information sounds like a source route with record-route option. While that's useful for debugging, it doesn't seem necessary. > b) congestion management was explained to us, and it was what convinced us we needed "ultimate > source RBridge" in order to know where to send the congestion notification. If you could explain the > other things, we could see if there is a problem, but if they are similar to congestion notification, then > having the ingress RBridge will accommodate them. Why doesn't the source ethernet address indicate this already? Joe --Boundary_(ID_0zLyy4776RHzIzxp530jZA)-- Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB8GGj1u014954 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Fri, 8 Dec 2006 08:16:45 -0800 (PST) Received: from [127.0.0.1] (pool-71-106-94-15.lsanca.dsl-w.verizon.net [71.106.94.15]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kB8G8ivN008379; Fri, 8 Dec 2006 08:08:45 -0800 (PST) Message-ID: <45798E0C.7010704@isi.edu> Date: Fri, 08 Dec 2006 08:08:44 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Silvano Gai <sgai@nuovasystems.com> References: <34BDD2A93E5FD84594BB230DD6C18EA2D11652@nuova-ex1.hq.nuovaimpresa.com> In-Reply-To: <34BDD2A93E5FD84594BB230DD6C18EA2D11652@nuova-ex1.hq.nuovaimpresa.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig2A16AA94D9321C2B8CEEA987" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 16:17:04 -0000 Status: RO Content-Length: 5238 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig2A16AA94D9321C2B8CEEA987 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Silvano Gai wrote: > Joe, >=20 > Inline: >=20 >> -----Original Message----- >> From: Joe Touch [mailto:touch@ISI.EDU] >> Sent: Friday, December 08, 2006 7:29 AM >> To: Silvano Gai >> Cc: Radia.Perlman@sun.com; Ali Sajassi (sajassi); Don Fedyk; Gray, > Eric; >> Developing a hybrid router/bridge. >> Subject: Re: [rbridge] Use of 802.1ah Encaps >> >> >> >> Silvano Gai wrote: >>> Joe, >>> >>> TRILL will never scale if you mandate to keep the forwarding table > for >>> the inner addresses on all RBridges, especially in a IEEE 802.1ah >>> environment!!! >> Sorry; let me backup: >> >> Here's where we were at the last IETF: >> >> - the shim indicates the source (ingress) and dest (egress) >> (originally this was just dest for unicast, source for mcast >> but we agreed in San Diego to include both) >> i.e., agreed with the point above; those are the >> addresses on which packets are forwarded >> >> the ultimate source is indicated in the shim already >> >> - the outer header already indicates the previous/next-hop rbridge >> >> What's the reason for needing any further information? >=20 > We don't. >=20 > My comment is that IEEE 802.1ah has no space for both the ultimate > source/dest and the next hop source/dest. >=20 > IEEE 802.1ah is designed for multiple enterprises to share a common > metro backbone. It does a fine job in that area. It does not support > well an arbitrary intermixing of Bridges and Rbridges. >=20 > In contrast Trill does a fine job in supporting arbitrary topologies an= d > mixing of RBridges and Bridges thanks to the availability of both the > ultimate source/dest and the next hop source/dest. >=20 > In TRILL the network between the "ingress" and "egress" RBridge isn't a= > single Ethernet (like in 802.1ah), but rather a sequence of RBridges > that may be connected by Ethernets. >=20 > Things look similar, but are substantially different. Agreed! Joe > -- Silvano >=20 >=20 >> As per below, if R1 (current rbridge) wants to pick from among > multiple >> next-hops R2 and R3, it does so with the outermost ethernet header. If= >> they're logical (R2/R3 both on the same NIC), then just assign > separate >> ethernet addresses to the same interface. >> >> What's left? >> >> Joe >> >> >>>> -----Original Message----- >>>> From: Joe Touch [mailto:touch@ISI.EDU] >>>> Sent: Thursday, December 07, 2006 11:00 PM >>>> To: Radia.Perlman@sun.com >>>> Cc: Ali Sajassi (sajassi); Silvano Gai; Don Fedyk; Gray, Eric; >>> Developing >>>> a hybrid router/bridge. >>>> Subject: Re: [rbridge] Use of 802.1ah Encaps >>>> >>>> >>>> >>>> Radia.Perlman@sun.com wrote: >>>>> Travelling again, so extremely limited access to email (as in, > about >>> 10 >>>> minutes here and there >>>>> on a SLOW connection). Anyway, I'll answer some of these: >>>>> >>>>> a) why "next hop" and "previous hop" in addition to "ultimate" >>> source >>>> and destination >>>>> At least one of the reasons is that if there are three RBridges on >>> the >>>> same link, R1, R2, and R3, >>>>> it is useful for R1 to choose which of R2 or R3 should receive the >>>> packet. It isn't obvious from >>>>> the destination address because it could be that either R2 or R3 >>> would >>>> be logical, and R1 is >>>>> load splitting. Also, it helps focus traffic on the link, and > ensure >>> it >>>> doesn't get filtered, if >>>>> the bridges on the link only need to learn R1, R2, and R3, >>> especially >>>> since traffic from outside >>>>> RBridges might arrive from different entry points onto the link. >>>> The ultimate destination (and source, for that matter) should be >>>> sufficiently indicated by the inner ethernet packet. The outer > header >>> is >>>> already hop-by-hop inside the rbridge anyway. What additional >>>> information is required? >>>> >>>> The next/previous hop information sounds like a source route with >>>> record-route option. While that's useful for debugging, it doesn't >>> seem >>>> necessary. >>>> >>>>> b) congestion management was explained to us, and it was what >>> convinced >>>> us we needed "ultimate >>>>> source RBridge" in order to know where to send the congestion >>>> notification. If you could explain the >>>>> other things, we could see if there is a problem, but if they are >>>> similar to congestion notification, then >>>>> having the ingress RBridge will accommodate them. >>>> Why doesn't the source ethernet address indicate this already? >>>> >>>> Joe >=20 --=20 ---------------------------------------- Joe Touch Sr. Network Engineer, USAF TSAT Space Segment --------------enig2A16AA94D9321C2B8CEEA987 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFeY4ME5f5cImnZrsRAry0AKD0IbQGsTogFYnc0ILQXSecQApx/gCeN9e/ CFR5vfBxwNhkDd4FVyEW0SM= =Dezp -----END PGP SIGNATURE----- --------------enig2A16AA94D9321C2B8CEEA987-- Received: from nuova-ex1.nuovasystems.com (nuova-ex1.nuovasystems.com [67.91.200.196]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB8FdXIK004967 for <rbridge@postel.org>; Fri, 8 Dec 2006 07:39:33 -0800 (PST) X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Date: Fri, 8 Dec 2006 07:39:28 -0800 Message-ID: <34BDD2A93E5FD84594BB230DD6C18EA2D11652@nuova-ex1.hq.nuovaimpresa.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: Acca3d+h/ZdWE9ruQsGd91u5c6sLWAAADHGQ From: "Silvano Gai" <sgai@nuovasystems.com> To: "Joe Touch" <touch@ISI.EDU> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sgai@nuovasystems.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB8FdXIK004967 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 15:39:42 -0000 Status: RO Content-Length: 4288 Joe, Inline: > -----Original Message----- > From: Joe Touch [mailto:touch@ISI.EDU] > Sent: Friday, December 08, 2006 7:29 AM > To: Silvano Gai > Cc: Radia.Perlman@sun.com; Ali Sajassi (sajassi); Don Fedyk; Gray, Eric; > Developing a hybrid router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > Silvano Gai wrote: > > Joe, > > > > TRILL will never scale if you mandate to keep the forwarding table for > > the inner addresses on all RBridges, especially in a IEEE 802.1ah > > environment!!! > > Sorry; let me backup: > > Here's where we were at the last IETF: > > - the shim indicates the source (ingress) and dest (egress) > (originally this was just dest for unicast, source for mcast > but we agreed in San Diego to include both) > i.e., agreed with the point above; those are the > addresses on which packets are forwarded > > the ultimate source is indicated in the shim already > > - the outer header already indicates the previous/next-hop rbridge > > What's the reason for needing any further information? We don't. My comment is that IEEE 802.1ah has no space for both the ultimate source/dest and the next hop source/dest. IEEE 802.1ah is designed for multiple enterprises to share a common metro backbone. It does a fine job in that area. It does not support well an arbitrary intermixing of Bridges and Rbridges. In contrast Trill does a fine job in supporting arbitrary topologies and mixing of RBridges and Bridges thanks to the availability of both the ultimate source/dest and the next hop source/dest. In TRILL the network between the "ingress" and "egress" RBridge isn't a single Ethernet (like in 802.1ah), but rather a sequence of RBridges that may be connected by Ethernets. Things look similar, but are substantially different. -- Silvano > > As per below, if R1 (current rbridge) wants to pick from among multiple > next-hops R2 and R3, it does so with the outermost ethernet header. If > they're logical (R2/R3 both on the same NIC), then just assign separate > ethernet addresses to the same interface. > > What's left? > > Joe > > > >> -----Original Message----- > >> From: Joe Touch [mailto:touch@ISI.EDU] > >> Sent: Thursday, December 07, 2006 11:00 PM > >> To: Radia.Perlman@sun.com > >> Cc: Ali Sajassi (sajassi); Silvano Gai; Don Fedyk; Gray, Eric; > > Developing > >> a hybrid router/bridge. > >> Subject: Re: [rbridge] Use of 802.1ah Encaps > >> > >> > >> > >> Radia.Perlman@sun.com wrote: > >>> Travelling again, so extremely limited access to email (as in, about > > 10 > >> minutes here and there > >>> on a SLOW connection). Anyway, I'll answer some of these: > >>> > >>> a) why "next hop" and "previous hop" in addition to "ultimate" > > source > >> and destination > >>> At least one of the reasons is that if there are three RBridges on > > the > >> same link, R1, R2, and R3, > >>> it is useful for R1 to choose which of R2 or R3 should receive the > >> packet. It isn't obvious from > >>> the destination address because it could be that either R2 or R3 > > would > >> be logical, and R1 is > >>> load splitting. Also, it helps focus traffic on the link, and ensure > > it > >> doesn't get filtered, if > >>> the bridges on the link only need to learn R1, R2, and R3, > > especially > >> since traffic from outside > >>> RBridges might arrive from different entry points onto the link. > >> The ultimate destination (and source, for that matter) should be > >> sufficiently indicated by the inner ethernet packet. The outer header > > is > >> already hop-by-hop inside the rbridge anyway. What additional > >> information is required? > >> > >> The next/previous hop information sounds like a source route with > >> record-route option. While that's useful for debugging, it doesn't > > seem > >> necessary. > >> > >>> b) congestion management was explained to us, and it was what > > convinced > >> us we needed "ultimate > >>> source RBridge" in order to know where to send the congestion > >> notification. If you could explain the > >>> other things, we could see if there is a problem, but if they are > >> similar to congestion notification, then > >>> having the ingress RBridge will accommodate them. > >> Why doesn't the source ethernet address indicate this already? > >> > >> Joe > > Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB8FV4xR002368 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Fri, 8 Dec 2006 07:31:04 -0800 (PST) Received: from [127.0.0.1] (pool-71-106-94-15.lsanca.dsl-w.verizon.net [71.106.94.15]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kB8FSmwP022926; Fri, 8 Dec 2006 07:28:49 -0800 (PST) Message-ID: <457984AF.3020501@isi.edu> Date: Fri, 08 Dec 2006 07:28:47 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Silvano Gai <sgai@nuovasystems.com> References: <34BDD2A93E5FD84594BB230DD6C18EA2D11648@nuova-ex1.hq.nuovaimpresa.com> In-Reply-To: <34BDD2A93E5FD84594BB230DD6C18EA2D11648@nuova-ex1.hq.nuovaimpresa.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigE21E66C864F8F7F57C12B9BB" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Radia.Perlman@sun.com Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 15:31:12 -0000 Status: RO Content-Length: 3745 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigE21E66C864F8F7F57C12B9BB Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Silvano Gai wrote: > Joe, >=20 > TRILL will never scale if you mandate to keep the forwarding table for > the inner addresses on all RBridges, especially in a IEEE 802.1ah > environment!!! Sorry; let me backup: Here's where we were at the last IETF: - the shim indicates the source (ingress) and dest (egress) (originally this was just dest for unicast, source for mcast but we agreed in San Diego to include both) i.e., agreed with the point above; those are the addresses on which packets are forwarded the ultimate source is indicated in the shim already - the outer header already indicates the previous/next-hop rbridge What's the reason for needing any further information? As per below, if R1 (current rbridge) wants to pick from among multiple next-hops R2 and R3, it does so with the outermost ethernet header. If they're logical (R2/R3 both on the same NIC), then just assign separate ethernet addresses to the same interface. What's left? Joe >> -----Original Message----- >> From: Joe Touch [mailto:touch@ISI.EDU] >> Sent: Thursday, December 07, 2006 11:00 PM >> To: Radia.Perlman@sun.com >> Cc: Ali Sajassi (sajassi); Silvano Gai; Don Fedyk; Gray, Eric; > Developing >> a hybrid router/bridge. >> Subject: Re: [rbridge] Use of 802.1ah Encaps >> >> >> >> Radia.Perlman@sun.com wrote: >>> Travelling again, so extremely limited access to email (as in, about > 10 >> minutes here and there >>> on a SLOW connection). Anyway, I'll answer some of these: >>> >>> a) why "next hop" and "previous hop" in addition to "ultimate" > source >> and destination >>> At least one of the reasons is that if there are three RBridges on > the >> same link, R1, R2, and R3, >>> it is useful for R1 to choose which of R2 or R3 should receive the >> packet. It isn't obvious from >>> the destination address because it could be that either R2 or R3 > would >> be logical, and R1 is >>> load splitting. Also, it helps focus traffic on the link, and ensure > it >> doesn't get filtered, if >>> the bridges on the link only need to learn R1, R2, and R3, > especially >> since traffic from outside >>> RBridges might arrive from different entry points onto the link. >> The ultimate destination (and source, for that matter) should be >> sufficiently indicated by the inner ethernet packet. The outer header > is >> already hop-by-hop inside the rbridge anyway. What additional >> information is required? >> >> The next/previous hop information sounds like a source route with >> record-route option. While that's useful for debugging, it doesn't > seem >> necessary. >> >>> b) congestion management was explained to us, and it was what > convinced >> us we needed "ultimate >>> source RBridge" in order to know where to send the congestion >> notification. If you could explain the >>> other things, we could see if there is a problem, but if they are >> similar to congestion notification, then >>> having the ingress RBridge will accommodate them. >> Why doesn't the source ethernet address indicate this already? >> >> Joe >=20 --------------enigE21E66C864F8F7F57C12B9BB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFeYSvE5f5cImnZrsRAreWAJ9diFM4ssarIs/C5jCoTvYdwI1nEgCfX3u2 n/558FG/mFnsmZ/IPIq0N3Y= =y5wo -----END PGP SIGNATURE----- --------------enigE21E66C864F8F7F57C12B9BB-- Received: from nuova-ex1.nuovasystems.com (nuova-ex1.nuovasystems.com [67.91.200.196]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB8FCM6R025991 for <rbridge@postel.org>; Fri, 8 Dec 2006 07:12:22 -0800 (PST) X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Date: Fri, 8 Dec 2006 06:59:17 -0800 Message-ID: <34BDD2A93E5FD84594BB230DD6C18EA2D11648@nuova-ex1.hq.nuovaimpresa.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: Accaln/FEKHGfwhrToutmWwMxAznbQAQnkXQ From: "Silvano Gai" <sgai@nuovasystems.com> To: "Joe Touch" <touch@ISI.EDU>, <Radia.Perlman@sun.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sgai@nuovasystems.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB8FCM6R025991 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 15:12:38 -0000 Status: RO Content-Length: 2313 Joe, TRILL will never scale if you mandate to keep the forwarding table for the inner addresses on all RBridges, especially in a IEEE 802.1ah environment!!! It is only the ingress Rbridge that looks at the inner address and put the egress RBridge address in the frame. -- Silvano > -----Original Message----- > From: Joe Touch [mailto:touch@ISI.EDU] > Sent: Thursday, December 07, 2006 11:00 PM > To: Radia.Perlman@sun.com > Cc: Ali Sajassi (sajassi); Silvano Gai; Don Fedyk; Gray, Eric; Developing > a hybrid router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > Radia.Perlman@sun.com wrote: > > Travelling again, so extremely limited access to email (as in, about 10 > minutes here and there > > on a SLOW connection). Anyway, I'll answer some of these: > > > > a) why "next hop" and "previous hop" in addition to "ultimate" source > and destination > > > > At least one of the reasons is that if there are three RBridges on the > same link, R1, R2, and R3, > > it is useful for R1 to choose which of R2 or R3 should receive the > packet. It isn't obvious from > > the destination address because it could be that either R2 or R3 would > be logical, and R1 is > > load splitting. Also, it helps focus traffic on the link, and ensure it > doesn't get filtered, if > > the bridges on the link only need to learn R1, R2, and R3, especially > since traffic from outside > > RBridges might arrive from different entry points onto the link. > > The ultimate destination (and source, for that matter) should be > sufficiently indicated by the inner ethernet packet. The outer header is > already hop-by-hop inside the rbridge anyway. What additional > information is required? > > The next/previous hop information sounds like a source route with > record-route option. While that's useful for debugging, it doesn't seem > necessary. > > > b) congestion management was explained to us, and it was what convinced > us we needed "ultimate > > source RBridge" in order to know where to send the congestion > notification. If you could explain the > > other things, we could see if there is a problem, but if they are > similar to congestion notification, then > > having the ingress RBridge will accommodate them. > > Why doesn't the source ethernet address indicate this already? > > Joe Received: from nuova-ex1.nuovasystems.com (nuova-ex1.nuovasystems.com [67.91.200.196]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB8FCM6T025991 for <rbridge@postel.org>; Fri, 8 Dec 2006 07:12:22 -0800 (PST) X-MIMEOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Date: Fri, 8 Dec 2006 07:07:25 -0800 Message-ID: <34BDD2A93E5FD84594BB230DD6C18EA2D1164A@nuova-ex1.hq.nuovaimpresa.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaGTxqeIHHWDcIQWGQhzE+3h7UCAAA3x4gABBjVuAAChq0YAAUtH2g From: "Silvano Gai" <sgai@nuovasystems.com> To: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com>, "Don Fedyk" <dwfedyk@nortel.com>, "Gray, Eric" <Eric.Gray@marconi.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sgai@nuovasystems.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB8FCM6T025991 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 15:12:39 -0000 Status: RO Content-Length: 4181 Ali, Inline: > -----Original Message----- > From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] > Sent: Thursday, December 07, 2006 9:23 PM > To: Silvano Gai; Don Fedyk; Gray, Eric > Cc: Developing a hybrid router/bridge.; Joe Touch > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > Silvano, > > > -----Original Message----- > > From: Silvano Gai [mailto:sgai@nuovasystems.com] > > Sent: Thursday, December 07, 2006 5:36 PM > > To: Don Fedyk; Gray, Eric; Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge.; Joe Touch > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > IMO it is technically possible for TRILL to adopt IEEE 802.1ah. > > There are advantages and disadvantages. > > > > The disadvantages are: > > 1) Lack of Next-Hop addresses. We discussed this at length > > during the last meeting and we didn't reach consensus on a > > way to eliminate them. > > Can you refresh my memory for why we need a next-hop address when the > header carries both source and destination PE addresses and when these > addresses are learned in control plane ? > Radia did in her reply > > 2) Lack of a TTL field (it may be added, but it is not there today). > > Can probably be accommodated. > > > 3) Many unneeded fields and therefore larger frame overhead. > > > > Such as ? The I-tag is not useful in TRILL and in contrast two addresses and the TTL are missing. > > > The advantages are: > > 1) Larger addressable market for TRILL > > > > IMO if we stick with the WG charter the disadvantages clearly > > outweigh the advantages. > > > > The WG can be re-chartered, but if we consider the Enterprise > > and Data Center market, IEEE 802.1ah is an overkill. > > > > If by overkill you mean a bit bigger header, then I agree but look at > all the other advantages that you get from using standard IEEE header > and shim including: > - security Mgmt: MACSec/KeySec > - Congestion Mgmt > - Connectivity Fault Mgmt > > Has it been considered how these are going to work with TRILL shim > header or are these outside of WG charter :-) > > -Ali > > > > -- Silvano > > > > > > > -----Original Message----- > > > From: rbridge-bounces@postel.org [mailto:rbridge-bounces@postel.org] > > On > > > Behalf Of Don Fedyk > > > Sent: Thursday, December 07, 2006 9:21 AM > > > To: Gray, Eric; Ali Sajassi (sajassi) > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > Hi Eric > > > > > > > -----Original Message----- > > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > > > Don, > > > > > > > > And yet, someone (Ali Sajassi) asserted (in his message > > dated Wed > > > > 12/6/2006 at 2:16 PM EST) that there were no issues or additional > > > > complications with using 802.1ah in enterprises for plug-and-play > > > > applicability. > > > > > > > > Perhaps Ali can answer my question then. > > > > > > > > But, to more directly address your earlier comments: > > > > > > > > The TRILL WG has NOT come up with an encapsulation that "looks > > > > like" 802.1ah - unless someone squints really hard and tries to > > > > pretend that two separate Ethernet encapsulations - > > separated by a > > > > SHIM header - are one single encapsulation. > > > > > > To be fair Point to Point header that was discussed without > > one of the > > > shims was very close "functionally" (colloquial looks like) to > > 802.1ah. > > > My opinion is still we don't need several variations of > > headers doing > > > similar things. > > > > > > This was the slide that looked a lot like what I posted. > > > > > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > > > > > Regards, > > > Don > > > > > > > > That is not to say that the WG has done anything that > > could be said > > > > to disallow the use of 802.1ah encapsulation. > > > > It is just not obviously consistent with all of the WG > > goals to use > > > > _only_ 802.1ah encapsulation. > > > > > > > > -- > > > > Eric > > > > > > > > > > _______________________________________________ > > > rbridge mailing list > > > rbridge@postel.org > > > http://mailman.postel.org/mailman/listinfo/rbridge > > Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB8709YH018480 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Thu, 7 Dec 2006 23:00:09 -0800 (PST) Received: from [127.0.0.1] (pool-71-106-94-15.lsanca.dsl-w.verizon.net [71.106.94.15]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kB86xhTh023535; Thu, 7 Dec 2006 22:59:45 -0800 (PST) Message-ID: <45790D5B.2050601@isi.edu> Date: Thu, 07 Dec 2006 22:59:39 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Radia.Perlman@sun.com References: <85f1b57d508e.457944c1@sunlabs.com> In-Reply-To: <85f1b57d508e.457944c1@sunlabs.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig32C6819D505654DAB50DBB40" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 07:00:18 -0000 Status: RO Content-Length: 2375 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig32C6819D505654DAB50DBB40 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Radia.Perlman@sun.com wrote: > Travelling again, so extremely limited access to email (as in, about 10= minutes here and there > on a SLOW connection). Anyway, I'll answer some of these: >=20 > a) why "next hop" and "previous hop" in addition to "ultimate" source a= nd destination >=20 > At least one of the reasons is that if there are three RBridges on the = same link, R1, R2, and R3, > it is useful for R1 to choose which of R2 or R3 should receive the pack= et. It isn't obvious from > the destination address because it could be that either R2 or R3 would = be logical, and R1 is > load splitting. Also, it helps focus traffic on the link, and ensure it= doesn't get filtered, if > the bridges on the link only need to learn R1, R2, and R3, especially s= ince traffic from outside > RBridges might arrive from different entry points onto the link. The ultimate destination (and source, for that matter) should be sufficiently indicated by the inner ethernet packet. The outer header is already hop-by-hop inside the rbridge anyway. What additional information is required? The next/previous hop information sounds like a source route with record-route option. While that's useful for debugging, it doesn't seem necessary. > b) congestion management was explained to us, and it was what convinced= us we needed "ultimate > source RBridge" in order to know where to send the congestion notificat= ion. If you could explain the > other things, we could see if there is a problem, but if they are simil= ar to congestion notification, then > having the ingress RBridge will accommodate them. Why doesn't the source ethernet address indicate this already? Joe --------------enig32C6819D505654DAB50DBB40 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFeQ1bE5f5cImnZrsRAs32AJ9If8nbh8Wog0xj/IfNSjheidORRQCeLTEu fWosnGDYCAmITHCM76vZrV4= =XhFR -----END PGP SIGNATURE----- --------------enig32C6819D505654DAB50DBB40-- Received: from mail-mta.sunlabs.com (edge.sunlabs.com [204.153.12.50]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB85uED3003122 for <rbridge@postel.org>; Thu, 7 Dec 2006 21:56:14 -0800 (PST) Received: from sml-sfvt3a.sfvic.sunlabs.com ([152.70.2.254]) by dps.sfvic.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTP id <0J9X00D92XTDDM00@dps.sfvic.sunlabs.com> for rbridge@postel.org; Thu, 07 Dec 2006 21:56:02 -0800 (PST) Received: from sunlabs.com ([152.70.2.254]) by mail-srv.sfvic.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTP id <0J9X00KT9XTDOP10@mail-srv.sfvic.sunlabs.com> for rbridge@postel.org; Thu, 07 Dec 2006 21:56:01 -0800 (PST) Received: from [152.70.2.164] (Forwarded-For: [59.92.0.181]) by mail-srv.sfvic.sunlabs.com (mshttpd); Fri, 08 Dec 2006 10:56:01 +0500 Date: Fri, 08 Dec 2006 10:56:01 +0500 From: Radia.Perlman@sun.com To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> Message-id: <85f1b57d508e.457944c1@sunlabs.com> MIME-version: 1.0 X-Mailer: Sun Java(tm) System Messenger Express 6.1 HotFix 0.02 (built Aug 25 2004) Content-type: text/plain; charset=us-ascii Content-language: en Content-transfer-encoding: 7BIT Content-disposition: inline X-Accept-Language: en Priority: normal X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: radia.perlman@sun.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 05:56:22 -0000 Status: RO Content-Length: 5392 Travelling again, so extremely limited access to email (as in, about 10 minutes here and there on a SLOW connection). Anyway, I'll answer some of these: a) why "next hop" and "previous hop" in addition to "ultimate" source and destination At least one of the reasons is that if there are three RBridges on the same link, R1, R2, and R3, it is useful for R1 to choose which of R2 or R3 should receive the packet. It isn't obvious from the destination address because it could be that either R2 or R3 would be logical, and R1 is load splitting. Also, it helps focus traffic on the link, and ensure it doesn't get filtered, if the bridges on the link only need to learn R1, R2, and R3, especially since traffic from outside RBridges might arrive from different entry points onto the link. b) congestion management was explained to us, and it was what convinced us we needed "ultimate source RBridge" in order to know where to send the congestion notification. If you could explain the other things, we could see if there is a problem, but if they are similar to congestion notification, then having the ingress RBridge will accommodate them. Sorry for ignoring all the other messages for now, but I only had a chance to read and respond to one message. Radia ----- Original Message ----- From: "Ali Sajassi (sajassi)" <sajassi@cisco.com> Date: Friday, December 8, 2006 10:53 am Subject: Re: [rbridge] Use of 802.1ah Encaps > > Silvano, > > > -----Original Message----- > > From: Silvano Gai [sgai@nuovasystems.com] > > Sent: Thursday, December 07, 2006 5:36 PM > > To: Don Fedyk; Gray, Eric; Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge.; Joe Touch > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > > > IMO it is technically possible for TRILL to adopt IEEE 802.1ah. > > There are advantages and disadvantages. > > > > The disadvantages are: > > 1) Lack of Next-Hop addresses. We discussed this at length > > during the last meeting and we didn't reach consensus on a > > way to eliminate them. > > Can you refresh my memory for why we need a next-hop address when the > header carries both source and destination PE addresses and when these > addresses are learned in control plane ? > > > 2) Lack of a TTL field (it may be added, but it is not there today). > > Can probably be accommodated. > > > 3) Many unneeded fields and therefore larger frame overhead. > > > > Such as ? > > > The advantages are: > > 1) Larger addressable market for TRILL > > > > IMO if we stick with the WG charter the disadvantages clearly > > outweigh the advantages. > > > > The WG can be re-chartered, but if we consider the Enterprise > > and Data Center market, IEEE 802.1ah is an overkill. > > > > If by overkill you mean a bit bigger header, then I agree but look at > all the other advantages that you get from using standard IEEE header > and shim including: > - security Mgmt: MACSec/KeySec > - Congestion Mgmt > - Connectivity Fault Mgmt > > Has it been considered how these are going to work with TRILL shim > header or are these outside of WG charter :-) > > -Ali > > > > -- Silvano > > > > > > > -----Original Message----- > > > From: rbridge-bounces@postel.org [rbridge-bounces@postel.org] > > On > > > Behalf Of Don Fedyk > > > Sent: Thursday, December 07, 2006 9:21 AM > > > To: Gray, Eric; Ali Sajassi (sajassi) > > > Cc: Developing a hybrid router/bridge.; Joe Touch > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > Hi Eric > > > > > > > -----Original Message----- > > > > From: Gray, Eric [Eric.Gray@marconi.com] > > > > > > > > Don, > > > > > > > > And yet, someone (Ali Sajassi) asserted (in his message > > dated Wed > > > > 12/6/2006 at 2:16 PM EST) that there were no issues or > additional > > > > complications with using 802.1ah in enterprises for plug-and- > play > > > > applicability. > > > > > > > > Perhaps Ali can answer my question then. > > > > > > > > But, to more directly address your earlier comments: > > > > > > > > The TRILL WG has NOT come up with an encapsulation that > "looks > > > > like" 802.1ah - unless someone squints really hard and tries > to > > > > pretend that two separate Ethernet encapsulations - > > separated by a > > > > SHIM header - are one single encapsulation. > > > > > > To be fair Point to Point header that was discussed without > > one of the > > > shims was very close "functionally" (colloquial looks like) to > > 802.1ah. > > > My opinion is still we don't need several variations of > > headers doing > > > similar things. > > > > > > This was the slide that looked a lot like what I posted. > > > > > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > > > > > Regards, > > > Don > > > > > > > > That is not to say that the WG has done anything that > > could be said > > > > to disallow the use of 802.1ah encapsulation. > > > > It is just not obviously consistent with all of the WG > > goals to use > > > > _only_ 802.1ah encapsulation. > > > > > > > > -- > > > > Eric > > > > > > > > > > _______________________________________________ > > > rbridge mailing list > > > rbridge@postel.org > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB85NSB7025428 for <rbridge@postel.org>; Thu, 7 Dec 2006 21:23:28 -0800 (PST) Received: from sj-dkim-5.cisco.com ([171.68.10.79]) by sj-iport-4.cisco.com with ESMTP; 07 Dec 2006 21:23:27 -0800 Received: from sj-core-4.cisco.com (sj-core-4.cisco.com [171.68.223.138]) by sj-dkim-5.cisco.com (8.12.11/8.12.11) with ESMTP id kB85NR39002578; Thu, 7 Dec 2006 21:23:27 -0800 Received: from xbh-sjc-221.amer.cisco.com (xbh-sjc-221.cisco.com [128.107.191.63]) by sj-core-4.cisco.com (8.12.10/8.12.6) with ESMTP id kB85NROV001645; Thu, 7 Dec 2006 21:23:27 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-221.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 7 Dec 2006 21:23:27 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 21:23:26 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB02782FC2@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaGTxqeIHHWDcIQWGQhzE+3h7UCAAA3x4gABBjVuAAChq0YA== From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Silvano Gai" <sgai@nuovasystems.com>, "Don Fedyk" <dwfedyk@nortel.com>, "Gray, Eric" <Eric.Gray@marconi.com> X-OriginalArrivalTime: 08 Dec 2006 05:23:27.0094 (UTC) FILETIME=[FD4D8960:01C71A88] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=3782; t=1165555407; x=1166419407; c=relaxed/simple; s=sjdkim5002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=I1ngqjYx+WVl/EJm8GROOP6N10Lc1jciN1N33xhwAMk=; b=l+966F3a5jJCKe+8xpOlisIBso6CNSgmPvo7XOJhFKLaFJJ1cVQNzKOmNc6/LauPlFNooySW llBv5uhaXaF/wbEyPoTORyTw6u5Kys3e15zQuO479Ya8fp7m+feAJ2ix; Authentication-Results: sj-dkim-5; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim5002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB85NSB7025428 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 05:23:43 -0000 Status: RO Content-Length: 3578 Silvano, > -----Original Message----- > From: Silvano Gai [mailto:sgai@nuovasystems.com] > Sent: Thursday, December 07, 2006 5:36 PM > To: Don Fedyk; Gray, Eric; Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge.; Joe Touch > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > IMO it is technically possible for TRILL to adopt IEEE 802.1ah. > There are advantages and disadvantages. > > The disadvantages are: > 1) Lack of Next-Hop addresses. We discussed this at length > during the last meeting and we didn't reach consensus on a > way to eliminate them. Can you refresh my memory for why we need a next-hop address when the header carries both source and destination PE addresses and when these addresses are learned in control plane ? > 2) Lack of a TTL field (it may be added, but it is not there today). Can probably be accommodated. > 3) Many unneeded fields and therefore larger frame overhead. > Such as ? > The advantages are: > 1) Larger addressable market for TRILL > > IMO if we stick with the WG charter the disadvantages clearly > outweigh the advantages. > > The WG can be re-chartered, but if we consider the Enterprise > and Data Center market, IEEE 802.1ah is an overkill. > If by overkill you mean a bit bigger header, then I agree but look at all the other advantages that you get from using standard IEEE header and shim including: - security Mgmt: MACSec/KeySec - Congestion Mgmt - Connectivity Fault Mgmt Has it been considered how these are going to work with TRILL shim header or are these outside of WG charter :-) -Ali > -- Silvano > > > > -----Original Message----- > > From: rbridge-bounces@postel.org [mailto:rbridge-bounces@postel.org] > On > > Behalf Of Don Fedyk > > Sent: Thursday, December 07, 2006 9:21 AM > > To: Gray, Eric; Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge.; Joe Touch > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > Hi Eric > > > > > -----Original Message----- > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > > > Don, > > > > > > And yet, someone (Ali Sajassi) asserted (in his message > dated Wed > > > 12/6/2006 at 2:16 PM EST) that there were no issues or additional > > > complications with using 802.1ah in enterprises for plug-and-play > > > applicability. > > > > > > Perhaps Ali can answer my question then. > > > > > > But, to more directly address your earlier comments: > > > > > > The TRILL WG has NOT come up with an encapsulation that "looks > > > like" 802.1ah - unless someone squints really hard and tries to > > > pretend that two separate Ethernet encapsulations - > separated by a > > > SHIM header - are one single encapsulation. > > > > To be fair Point to Point header that was discussed without > one of the > > shims was very close "functionally" (colloquial looks like) to > 802.1ah. > > My opinion is still we don't need several variations of > headers doing > > similar things. > > > > This was the slide that looked a lot like what I posted. > > > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > > > Regards, > > Don > > > > > > That is not to say that the WG has done anything that > could be said > > > to disallow the use of 802.1ah encapsulation. > > > It is just not obviously consistent with all of the WG > goals to use > > > _only_ 802.1ah encapsulation. > > > > > > -- > > > Eric > > > > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB852WCX019935 for <rbridge@postel.org>; Thu, 7 Dec 2006 21:02:33 -0800 (PST) Received: from sj-dkim-2.cisco.com ([171.71.179.186]) by sj-iport-4.cisco.com with ESMTP; 07 Dec 2006 21:02:32 -0800 Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id kB852Wjk015376; Thu, 7 Dec 2006 21:02:32 -0800 Received: from xbh-sjc-221.amer.cisco.com (xbh-sjc-221.cisco.com [128.107.191.63]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id kB852Oin005731; Thu, 7 Dec 2006 21:02:32 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-221.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 7 Dec 2006 21:02:22 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 21:02:21 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB02782FC1@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaGN6DriKwTsv5T0m+18dUYgddDAAbOi0g From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Don Fedyk" <dwfedyk@nortel.com> X-OriginalArrivalTime: 08 Dec 2006 05:02:22.0329 (UTC) FILETIME=[0B71B690:01C71A86] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=2714; t=1165554152; x=1166418152; c=relaxed/simple; s=sjdkim2002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=ASxnxluGyfMopAgkdC37YxGnP1LevG4QworefRzVlfE=; b=R/0nq2+OTwFJqetmsVelCFceQRDmt8a1Yd+odqGvJ/iLG2UgLecZMLZBq2KlmrXI7wwYAWSB OQD3W8EzJ2vZrB3WenfN1W0PY+9x+K+C7SkovHVsHoIVbuVSNIDQrM5B; Authentication-Results: sj-dkim-2; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim2002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB852WCX019935 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 05:02:54 -0000 Status: RO Content-Length: 2554 Gray, Please let me know if my previous email doesn't answer your question and if it doesn't, then let me know which portion needs further clarification. -Ali > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > Sent: Thursday, December 07, 2006 8:01 AM > To: Don Fedyk; Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge.; Joe Touch > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Don, > > And yet, someone (Ali Sajassi) asserted (in his message > dated Wed 12/6/2006 at 2:16 PM EST) that there were no issues > or additional complications with using 802.1ah in enterprises > for plug-and-play applicability. > > Perhaps Ali can answer my question then. > > But, to more directly address your earlier comments: > > The TRILL WG has NOT come up with an encapsulation that > "looks like" 802.1ah - unless someone squints really hard and > tries to pretend that two separate Ethernet encapsulations - > separated by a SHIM header - are one single encapsulation. > > That is not to say that the WG has done anything that > could be said to disallow the use of 802.1ah encapsulation. > It is just not obviously consistent with all of the WG goals > to use _only_ 802.1ah encapsulation. > > -- > Eric > > > -----Original Message----- > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > Sent: Thursday, December 07, 2006 9:33 AM > > To: Gray, Eric; Joe Touch; Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge. > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Hi Eric > > > > > -----Original Message----- > > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > Sent: Thursday, December 07, 2006 8:38 AM Don, > > > > > > Thanks for doing this. As you can probably attest, this is a > > > non-trivial "digging" task to come up with this level of > detail. I > > > am not sure why Joe asked for it, but now that you have > provided it, > > > perhaps you can explain how values would be derived for the B-TAG > > > TCI/VID and I-TAG TCI/SID fields if we'd like to deploy this > > > technology in > > "plug-and-play" mode? > > > > I have not given much thought to plug-and-play. My advice would be > > learn the current semantics of the fields and see what they > offer. I > > don't see why these fields, which offer encapsulation, backwards > > compatibility, Connectivity Fault Management (CFM) frames > etc are any > > worse than similar alternatives. > > > > Don > > > > > > > > -- > > > Eric > > > > > ><snipped hopelessly garbled> > > > Received: from sj-iport-5.cisco.com (sj-iport-5.cisco.com [171.68.10.87]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB84xR6p019064 for <rbridge@postel.org>; Thu, 7 Dec 2006 20:59:27 -0800 (PST) Received: from sj-dkim-3.cisco.com ([171.71.179.195]) by sj-iport-5.cisco.com with ESMTP; 07 Dec 2006 20:59:27 -0800 Received: from sj-core-5.cisco.com (sj-core-5.cisco.com [171.71.177.238]) by sj-dkim-3.cisco.com (8.12.11/8.12.11) with ESMTP id kB84xQ5V005265; Thu, 7 Dec 2006 20:59:26 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-5.cisco.com (8.12.10/8.12.6) with ESMTP id kB84xQW4026120; Thu, 7 Dec 2006 20:59:26 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 7 Dec 2006 20:59:26 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 20:59:25 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB02782FBF@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaBl+wymSB3NYnQK6wL/eo053LyQAfh8lA From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Joe Touch" <touch@ISI.EDU> X-OriginalArrivalTime: 08 Dec 2006 04:59:26.0339 (UTC) FILETIME=[A28BC530:01C71A85] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=2011; t=1165553966; x=1166417966; c=relaxed/simple; s=sjdkim3002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=Y8rB3YI8ts2uGaYT1/uGeUIg0qAY1YB0SX+cBs54Spo=; b=ug7rmZ00DH6cxQkyOQQpsv5/44BD5AT7jk309TGGiOeagf3wP2RasadMIspKQi20n/T62faI 81HKPEVyd5vmeXIonhSffnMVjCtyj/9IhxJxm1uoa47N34wPr5E6fCYQ; Authentication-Results: sj-dkim-3; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim3002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB84xR6p019064 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 04:59:37 -0000 Status: RO Content-Length: 1910 > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > Sent: Thursday, December 07, 2006 5:48 AM > To: Joe Touch; Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Joe/Ali, > > It is not as simple as this. > > The IETF has already established a precedent for > Ethernet encapsulation of SHIM-encapsulated Ethernet. It's > only trying to see this as a single encapsulation, that > causes people to conclude we are inventing a new form of > Ethernet encapsulation. > > Other than inappropriate "designing committee" > discussion at the last IETF meeting, we have not been > attempting to design any new Ethernet encapsulation. And I > believe we should safely conclude, at this point, that the > discussion that took place on this topic at the TRILL meeting > last month can be closed and considered to have been > completely unproductive. I think it is always good to have discussions among ourselves to see how we can leverage each other expertise and technology and whether what you are doing can be leveraged in other applications. The basic premise in here is that there is a good level of overlap among different areas that are being worked on by different WGs, and we will do each other as well as industry a great service if we can come up with a common solution jointly. -Ali > > Big surprise... > > -- > Eric > > > -----Original Message----- > > From: rbridge-bounces@postel.org > > [mailto:rbridge-bounces@postel.org] On Behalf Of Joe Touch > > Sent: Wednesday, December 06, 2006 10:23 PM > > To: Ali Sajassi (sajassi) > > Cc: Developing a hybrid router/bridge. > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > Received: from sj-iport-5.cisco.com (sj-iport-5.cisco.com [171.68.10.87]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB84lZUT015947 for <rbridge@postel.org>; Thu, 7 Dec 2006 20:47:35 -0800 (PST) Received: from sj-dkim-3.cisco.com ([171.71.179.195]) by sj-iport-5.cisco.com with ESMTP; 07 Dec 2006 20:47:35 -0800 Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-3.cisco.com (8.12.11/8.12.11) with ESMTP id kB84lYEp030286; Thu, 7 Dec 2006 20:47:34 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id kB84lYin028960; Thu, 7 Dec 2006 20:47:34 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 7 Dec 2006 20:47:34 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 20:47:33 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB02782FB4@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaBQWEkfXD3Z5eQ0Gu/aVnfRS1sAAfe5qw From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Don Fedyk" <dwfedyk@nortel.com>, "Joe Touch" <touch@ISI.EDU> X-OriginalArrivalTime: 08 Dec 2006 04:47:34.0342 (UTC) FILETIME=[FA29A660:01C71A83] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=6507; t=1165553254; x=1166417254; c=relaxed/simple; s=sjdkim3002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=5uxFZSRxdONG04+4vnp7NTkVa6A/fDXnaoTOKUeuC4s=; b=ogHsbGxT+FKH0E9bFBmYR6quOJ95fByfaBsyQWyW9VTZA3SVMHLoxocqSqe/yzHKwvnRIpwn swFnbOX0sRRI0FZzfTgGbeVURLmXUuojchZ1hoUxh9SKR44ixCwJmxTz; Authentication-Results: sj-dkim-3; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim3002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB84lZUT015947 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 04:47:45 -0000 Status: RO Content-Length: 6133 Gray, With respect to plug-and-play operation, it is similar to 802.1Q or 802.1ad operation; where, at the UNI you decide which interfaces belong to which VLANs in case of 802.1Q or which <interface, VLAN> pair belong to S-tag in case of 802.1ad (e.g., point-to-cloud config model). In case of 802.1ah, you also decide at the UNI which interfaces or which <interface, vlan> pair belong to which <B-tag, I-SID> pair. Again the model in 802.1ah is point-to-cloud model just like 802.1Q and 802.1ad and that's what makes it plug-and-play. -Ali > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > Sent: Thursday, December 07, 2006 5:38 AM > To: Don Fedyk; Joe Touch; Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Don, > > Thanks for doing this. As you can probably attest, > this is a non-trivial "digging" task to come up with this > level of detail. I am not sure why Joe asked for it, but now > that you have provided it, perhaps you can explain how values > would be derived for the B-TAG TCI/VID and I-TAG TCI/SID > fields if we'd like to deploy this technology in "plug-and-play" mode? > > -- > Eric > > > -----Original Message----- > > From: Don Fedyk [mailto:dwfedyk@nortel.com] > > Sent: Thursday, December 07, 2006 8:29 AM > > To: Joe Touch; Ali Sajassi (sajassi) > > Cc: Gray, Eric; Developing a hybrid router/bridge. > > Subject: RE: [rbridge] Use of 802.1ah Encaps > > > > Hi > > > > This is the Provider Backbone Header Format reproduced from > one of the > > 802.1ah documents. When I said this is similar to the Trill header > > this is the version I mentioned. I converted to > textographics by hand > > so I hope I got it right. I put field designators in [] inside the > > picture for fear they would get wrapped. The encapsulated > frame starts > > after the I-TAG I-SID. > > > > > > | 1 | 2 | 3 | 4 > > | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > -2 | | > | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > + > > 2 | Backbone Destination Address > [B-DA] | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > 6 | Backbone Source Address > [B-SA] | > > + > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > 10 | | .1ad Ethertype > [B-TAG] | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > 14 | .1ad B-TAG TCI/VID | .1ah Ethertype [ > ] | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ > I ]-+-+-+ > > 18 | .1ah I-TAG TCI/SID [ > - ] | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ > T ]-+-+-+ > > 22 | Customer Destination Address [ > A ] | > > + +-+-+-+-+-+-+-+-+-+-+-[ > G ]-+-+-+ > > 26 | | [ > ] | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ [ > ] + > > 30 | Customer Source Address [ > ] | > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ > ]-+-+-+ > > 34 | Encap Ethertype | [ ] > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > > > .1ah I-TAG TCI > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > | P/DE |R1 |R2 | I-SID > | > > > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > > P/DE 3 Bits Priority 1 bit Drop Eligible > > R1 Res1 > > R2 Res2 > > > > a) priority - This 3 bit field carries the customer > priority (I-PCP) > > associated with this frame. The provider network operates on the > > priority associated with the B-TAG. > > > > b) drop_eligible - This 1 bit field carries the customer drop > > eligibility > > (I-DEI) associated with this frame. The provider network > operates on > > the drop eligibility associated with the B-TAG. > > > > c) res1 - This 2 bit field is used for any future format > variations. > > The > > res2 > > field is zero on transmit and is ignored on receipt. > > > > d) res2 - This 2 bit field is used for any future format > variations. > > The > > res1 > > field is zero on transmit and if set on reception the frame is > > discarded. > > > > e) I-SID - This 24 bit field carries the service instance > identifier > > associated with this frame. > > > > f) encapsulated C-DA - This field carries the 48 bit > Destination MAC > > Address for an encapsulated Ethernet frame. > > > > g) encapsulated C-SA - This field carries the 48 bit Source MAC > > Address for an encapsulated Ethernet frame. > > > > Regards, > > Don > > > > > > > -----Original Message----- > > > From: Joe Touch [mailto:touch@ISI.EDU] > > > Sent: Wednesday, December 06, 2006 9:53 PM > > > To: Ali Sajassi (sajassi) > > > Cc: Fedyk, Don (BL60:1A00); Gray, Eric; Developing a hybrid > > > router/bridge. > > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > > > I'd really rather someone just posted the header / fields, rather > > > than a large document in which that information is buried, if > > > possible ;-) > > > > > > Joe > > > > > > Ali Sajassi (sajassi) wrote: > > > > > > > >> Can you - or anyone with easy access to the specs - > > please post an > > > >> explicit description of 802.1ah header and fields? > > > > > > > > I will ask Tony (802.1 chair) to make avail to TRILL WG a > > > copy of .1ah. > > > > > > > > -Ali > > > > > > > > > > > >> Thanks, > > > >> > > > >> Joe > > > >> > > > >> > > > > > > -- > > > ---------------------------------------- > > > Joe Touch > > > Sr. Network Engineer, USAF TSAT Space Segment > > > > > > > > > Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB84dQaB013539 for <rbridge@postel.org>; Thu, 7 Dec 2006 20:39:26 -0800 (PST) Received: from sj-dkim-3.cisco.com ([171.71.179.195]) by sj-iport-4.cisco.com with ESMTP; 07 Dec 2006 20:39:26 -0800 Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-3.cisco.com (8.12.11/8.12.11) with ESMTP id kB84dPgj024534; Thu, 7 Dec 2006 20:39:25 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id kB84dPin025091; Thu, 7 Dec 2006 20:39:25 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 7 Dec 2006 20:39:25 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C71A82.D650E4DF" Date: Thu, 7 Dec 2006 20:39:17 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB02782FB0@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccZqtCZNyAAgmj5QEKwnpuXlDrTygAVKArQACCjzUA= From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Don Fedyk" <dwfedyk@nortel.com>, "Joe Touch" <touch@ISI.EDU> X-OriginalArrivalTime: 08 Dec 2006 04:39:25.0229 (UTC) FILETIME=[D6A0EDD0:01C71A82] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=234478; t=1165552765; x=1166416765; c=relaxed/simple; s=sjdkim3002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=LrYyr5DBbS0hK2usqkCX4m3f6FQUT6VDoJaiToZ22qY=; b=Mh9YSxT7H/fYEUDUi01WYk8Go+2CrQnqf/bQPnJO+ujQJ4G9t1qsfuawBt3RtoOkdfezbEoH rpwGYsje0wJEKoLnDxYTy+H24sH2L27WlVhbAO8bbxs/cciBnhrwNyx5; Authentication-Results: sj-dkim-3; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim3002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 04:39:39 -0000 Status: RO Content-Length: 231433 This is a multi-part message in MIME format. ------_=_NextPart_001_01C71A82.D650E4DF Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Attached is the extraction from the 802.1ah spec. regarding header format. -Ali =20 > -----Original Message----- > From: Don Fedyk [mailto:dwfedyk@nortel.com]=20 > Sent: Thursday, December 07, 2006 5:29 AM > To: Joe Touch; Ali Sajassi (sajassi) > Cc: Gray, Eric; Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps >=20 > Hi=20 >=20 > This is the Provider Backbone Header Format reproduced from=20 > one of the 802.1ah documents. When I said this is similar to=20 > the Trill header this is the version I mentioned. I=20 > converted to textographics by hand so I hope I got it right.=20 > I put field designators in [] inside the picture for fear=20 > they would get wrapped. The encapsulated frame starts after=20 > the I-TAG I-SID. >=20 > =20 > | 1 | 2 | 3 | 4=20 > | =20 > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > -2 | | | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + > 2 | Backbone Destination Address [B-DA] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > 6 | Backbone Source Address [B-SA] | > + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > 10 | | .1ad Ethertype [B-TAG] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > 14 | .1ad B-TAG TCI/VID | .1ah Ethertype [ ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ I ]-+-+-+ > 18 | .1ah I-TAG TCI/SID [ - ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ T ]-+-+-+ > 22 | Customer Destination Address [ A ] | > + +-+-+-+-+-+-+-+-+-+-+-[ G ]-+-+-+ > 26 | | [ ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ [ ] + > 30 | Customer Source Address [ ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ ]-+-+-+ > 34 | Encap Ethertype | [ ] > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >=20 >=20 > .1ah I-TAG TCI > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | P/DE |R1 |R2 | I-SID | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >=20 > P/DE 3 Bits Priority 1 bit Drop Eligible > R1 Res1 > R2 Res2 >=20 > a) priority - This 3 bit field carries the customer priority=20 > (I-PCP) associated with this frame. The provider network=20 > operates on the priority associated with the B-TAG. =20 >=20 > b) drop_eligible - This 1 bit field carries the customer drop=20 > eligibility > (I-DEI) associated with this frame. The provider network=20 > operates on the drop eligibility associated with the B-TAG. =20 >=20 > c) res1 - This 2 bit field is used for any future format=20 > variations. The > res2 > field is zero on transmit and is ignored on receipt.=20 >=20 > d) res2 - This 2 bit field is used for any future format=20 > variations. The > res1 > field is zero on transmit and if set on reception the frame=20 > is discarded. =20 >=20 > e) I-SID - This 24 bit field carries the service instance=20 > identifier associated with this frame. =20 >=20 > f) encapsulated C-DA - This field carries the 48 bit=20 > Destination MAC Address for an encapsulated Ethernet frame. =20 >=20 > g) encapsulated C-SA - This field carries the 48 bit Source=20 > MAC Address for an encapsulated Ethernet frame. =20 >=20 > Regards, > Don >=20 >=20 > > -----Original Message----- > > From: Joe Touch [mailto:touch@ISI.EDU] > > Sent: Wednesday, December 06, 2006 9:53 PM > > To: Ali Sajassi (sajassi) > > Cc: Fedyk, Don (BL60:1A00); Gray, Eric; Developing a hybrid=20 > > router/bridge. > > Subject: Re: [rbridge] Use of 802.1ah Encaps > >=20 > > I'd really rather someone just posted the header / fields,=20 > rather than=20 > > a large document in which that information is buried, if=20 > possible ;-) > >=20 > > Joe > >=20 > > Ali Sajassi (sajassi) wrote: > > >=20 > > >> Can you - or anyone with easy access to the specs -=20 > please post an=20 > > >> explicit description of 802.1ah header and fields? > > >=20 > > > I will ask Tony (802.1 chair) to make avail to TRILL WG a > > copy of .1ah. > > >=20 > > > -Ali > > >=20 > > >=20 > > >> Thanks, > > >> > > >> Joe > > >> > > >> > >=20 > > -- > > ---------------------------------------- > > Joe Touch > > Sr. Network Engineer, USAF TSAT Space Segment > >=20 > >=20 >=20 ------_=_NextPart_001_01C71A82.D650E4DF Content-Type: application/msword; name="802-1ah-header.doc" Content-Transfer-Encoding: base64 Content-Description: 802-1ah-header.doc Content-Disposition: attachment; filename="802-1ah-header.doc" 0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAADAAAAQQEAAAAAAAAA EAAAQwEAAAEAAAD+////AAAAADoBAAA7AQAAQgEAAP////////////////////////////////// //////////////////////////////////////////////////////////////////////////// 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Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Date: Thu, 7 Dec 2006 17:35:54 -0800 Message-ID: <34BDD2A93E5FD84594BB230DD6C18EA2D115D5@nuova-ex1.hq.nuovaimpresa.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaGTxqeIHHWDcIQWGQhzE+3h7UCAAA3x4gABBjVuA= From: "Silvano Gai" <sgai@nuovasystems.com> To: "Don Fedyk" <dwfedyk@nortel.com>, "Gray, Eric" <Eric.Gray@marconi.com>, "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sgai@nuovasystems.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB81a2i9022519 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 08 Dec 2006 01:36:17 -0000 Status: RO Content-Length: 2503 IMO it is technically possible for TRILL to adopt IEEE 802.1ah. There are advantages and disadvantages. The disadvantages are: 1) Lack of Next-Hop addresses. We discussed this at length during the last meeting and we didn't reach consensus on a way to eliminate them. 2) Lack of a TTL field (it may be added, but it is not there today). 3) Many unneeded fields and therefore larger frame overhead. The advantages are: 1) Larger addressable market for TRILL IMO if we stick with the WG charter the disadvantages clearly outweigh the advantages. The WG can be re-chartered, but if we consider the Enterprise and Data Center market, IEEE 802.1ah is an overkill. -- Silvano > -----Original Message----- > From: rbridge-bounces@postel.org [mailto:rbridge-bounces@postel.org] On > Behalf Of Don Fedyk > Sent: Thursday, December 07, 2006 9:21 AM > To: Gray, Eric; Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge.; Joe Touch > Subject: Re: [rbridge] Use of 802.1ah Encaps > > Hi Eric > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > Don, > > > > And yet, someone (Ali Sajassi) asserted (in his message > > dated Wed 12/6/2006 at 2:16 PM EST) that there were no issues > > or additional complications with using 802.1ah in enterprises > > for plug-and-play applicability. > > > > Perhaps Ali can answer my question then. > > > > But, to more directly address your earlier comments: > > > > The TRILL WG has NOT come up with an encapsulation that > > "looks like" 802.1ah - unless someone squints really hard and > > tries to pretend that two separate Ethernet encapsulations - > > separated by a SHIM header - are one single encapsulation. > > To be fair Point to Point header that was discussed without one of the > shims was very close "functionally" (colloquial looks like) to 802.1ah. > My opinion is still we don't need several variations of headers doing > similar things. > > This was the slide that looked a lot like what I posted. > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > Regards, > Don > > > > That is not to say that the WG has done anything that > > could be said to disallow the use of 802.1ah encapsulation. > > It is just not obviously consistent with all of the WG goals > > to use _only_ 802.1ah encapsulation. > > > > -- > > Eric > > > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7IYKVu005724 for <rbridge@postel.org>; Thu, 7 Dec 2006 10:34:20 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB7IYBSL028810; Thu, 7 Dec 2006 13:34:11 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id NAA08333; Thu, 7 Dec 2006 13:34:07 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0T746>; Thu, 7 Dec 2006 13:34:06 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017272@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com> Date: Thu, 7 Dec 2006 13:34:06 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 18:34:29 -0000 Status: RO Content-Length: 2515 Don, I think we're not disagreeing with each other. Where people make proposals that look like an existing encapsulation, the complexity associated with defining a new encapsulation that is marginally different has to be weighed very carefully against what we expect to gain in doing so. I think it is clear to me that the complexity is not justified. Moreover, I don't see anyone continuing to make the case that we should do this - so it may be the case that many people are of a similar opinion. The issue of whether or not it makes sense to use the specific encapsulation proposed - or an existing similar encapsulation - in the RBridge problem domain is a horse of a different color. I am not sure that we've achieved any level of agreement on this issue, consequently this entire discussion could be considered simply as a distraction. -- Eric > -----Original Message----- > From: Don Fedyk [mailto:dwfedyk@nortel.com] > Sent: Thursday, December 07, 2006 12:21 PM > To: Gray, Eric; Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge.; Joe Touch > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Hi Eric > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > > > Don, > > > > And yet, someone (Ali Sajassi) asserted (in his message > > dated Wed 12/6/2006 at 2:16 PM EST) that there were no issues > > or additional complications with using 802.1ah in enterprises > > for plug-and-play applicability. > > > > Perhaps Ali can answer my question then. > > > > But, to more directly address your earlier comments: > > > > The TRILL WG has NOT come up with an encapsulation that > > "looks like" 802.1ah - unless someone squints really hard and > > tries to pretend that two separate Ethernet encapsulations - > > separated by a SHIM header - are one single encapsulation. > > To be fair Point to Point header that was discussed without one of the > shims was very close "functionally" (colloquial looks like) > to 802.1ah. > My opinion is still we don't need several variations of headers doing > similar things. > > This was the slide that looked a lot like what I posted. > > http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm > > Regards, > Don > > > > That is not to say that the WG has done anything that > > could be said to disallow the use of 802.1ah encapsulation. > > It is just not obviously consistent with all of the WG goals > > to use _only_ 802.1ah encapsulation. > > > > -- > > Eric > > > Received: from zcars04e.nortel.com (zcars04e.nortel.com [47.129.242.56]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7HLCQF002992 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Thu, 7 Dec 2006 09:21:13 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zcars04e.nortel.com (Switch-2.2.0/Switch-2.2.0) with ESMTP id kB7HDh817358; Thu, 7 Dec 2006 12:13:43 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 12:20:52 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C4E6F67@zrtphxm2.corp.nortel.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D8125010171C1@uspitsmsgusr08.win.marconi.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaGTxqeIHHWDcIQWGQhzE+3h7UCAAA3x4g From: "Don Fedyk" <dwfedyk@nortel.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB7HLCQF002992 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 17:21:35 -0000 Status: RO Content-Length: 1303 Hi Eric > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Don, > > And yet, someone (Ali Sajassi) asserted (in his message > dated Wed 12/6/2006 at 2:16 PM EST) that there were no issues > or additional complications with using 802.1ah in enterprises > for plug-and-play applicability. > > Perhaps Ali can answer my question then. > > But, to more directly address your earlier comments: > > The TRILL WG has NOT come up with an encapsulation that > "looks like" 802.1ah - unless someone squints really hard and > tries to pretend that two separate Ethernet encapsulations - > separated by a SHIM header - are one single encapsulation. To be fair Point to Point header that was discussed without one of the shims was very close "functionally" (colloquial looks like) to 802.1ah. My opinion is still we don't need several variations of headers doing similar things. This was the slide that looked a lot like what I posted. http://www3.ietf.org/proceedings/06nov/slides/trill-1/sld13.htm Regards, Don > > That is not to say that the WG has done anything that > could be said to disallow the use of 802.1ah encapsulation. > It is just not obviously consistent with all of the WG goals > to use _only_ 802.1ah encapsulation. > > -- > Eric > Received: from mail119.messagelabs.com (mail119.messagelabs.com [216.82.241.179]) by boreas.isi.edu (8.13.8/8.13.8) with SMTP id kB7GZVsf017400 for <rbridge@postel.org>; Thu, 7 Dec 2006 08:35:31 -0800 (PST) X-VirusChecked: Checked X-Env-Sender: Donald.Eastlake@motorola.com X-Msg-Ref: server-12.tower-119.messagelabs.com!1165508693!14941513!1 X-StarScan-Version: 5.5.10.7; banners=-,-,- X-Originating-IP: [129.188.136.9] Received: (qmail 18220 invoked from network); 7 Dec 2006 16:24:53 -0000 Received: from ftpbox.mot.com (HELO ftpbox.mot.com) (129.188.136.9) by server-12.tower-119.messagelabs.com with SMTP; 7 Dec 2006 16:24:53 -0000 Received: from az33exr01.mot.com ([10.64.251.231]) by ftpbox.mot.com (8.12.11/Motorola) with ESMTP id kB7GOngf029192 for <rbridge@postel.org>; Thu, 7 Dec 2006 10:24:53 -0600 (CST) Received: from de01exm64.ds.mot.com (de01exm64.am.mot.com [10.176.8.15]) by az33exr01.mot.com (8.13.1/8.13.0) with ESMTP id kB7GOmAB019055 for <rbridge@postel.org>; Thu, 7 Dec 2006 10:24:48 -0600 (CST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 11:24:47 -0500 Message-ID: <3870C46029D1F945B1472F170D2D979001C9121C@de01exm64.ds.mot.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Use of 802.11s Encaps Thread-Index: AccaHDX/gt450V/qQ0u6IDtC/GGCRA== From: "Eastlake III Donald-LDE008" <Donald.Eastlake@motorola.com> To: <rbridge@postel.org> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: donald.eastlake@motorola.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB7GZVsf017400 Subject: [rbridge] Use of 802.11s Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 16:35:37 -0000 Status: RO Content-Length: 308 As long as people are looking at encapsulations, how about the encapsulation currently in the 802.11s draft? It has lots of nifty fields including six addresses and a TTL! Although the Draft is restricted, see ftp://ftp.802wirelessworld.com/11/06/11-06-1464-02-000s-6-address-scheme -tgs-mesh.doc. Donald Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7G3R3o006863 for <rbridge@postel.org>; Thu, 7 Dec 2006 08:03:27 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB7G0cSL025657; Thu, 7 Dec 2006 11:00:38 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id LAA28400; Thu, 7 Dec 2006 11:00:37 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0TZ6H>; Thu, 7 Dec 2006 11:00:37 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D8125010171C1@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com> Date: Thu, 7 Dec 2006 11:00:36 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org>, Joe Touch <touch@ISI.EDU> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 16:03:39 -0000 Status: RO Content-Length: 1997 Don, And yet, someone (Ali Sajassi) asserted (in his message dated Wed 12/6/2006 at 2:16 PM EST) that there were no issues or additional complications with using 802.1ah in enterprises for plug-and-play applicability. Perhaps Ali can answer my question then. But, to more directly address your earlier comments: The TRILL WG has NOT come up with an encapsulation that "looks like" 802.1ah - unless someone squints really hard and tries to pretend that two separate Ethernet encapsulations - separated by a SHIM header - are one single encapsulation. That is not to say that the WG has done anything that could be said to disallow the use of 802.1ah encapsulation. It is just not obviously consistent with all of the WG goals to use _only_ 802.1ah encapsulation. -- Eric > -----Original Message----- > From: Don Fedyk [mailto:dwfedyk@nortel.com] > Sent: Thursday, December 07, 2006 9:33 AM > To: Gray, Eric; Joe Touch; Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Hi Eric > > > -----Original Message----- > > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Sent: Thursday, December 07, 2006 8:38 AM > > Don, > > > > Thanks for doing this. As you can probably attest, > > this is a non-trivial "digging" task to come up with this > > level of detail. I am not sure why Joe asked for it, but now > > that you have provided it, perhaps you can explain how values > > would be derived for the B-TAG TCI/VID and I-TAG TCI/SID > > fields if we'd like to deploy this technology in > "plug-and-play" mode? > > I have not given much thought to plug-and-play. My advice > would be learn > the current semantics of the fields and see what they offer. I don't > see why these fields, which offer encapsulation, backwards > compatibility, Connectivity Fault Management (CFM) frames etc are any > worse than similar alternatives. > > Don > > > > > -- > > Eric > > > ><snipped hopelessly garbled> > Received: from zrtps0kn.nortel.com (zrtps0kn.nortel.com [47.140.192.55]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7EXI3A028188 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Thu, 7 Dec 2006 06:33:18 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zrtps0kn.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id kB7EWtU10126; Thu, 7 Dec 2006 09:32:55 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 09:32:53 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C48C210@zrtphxm2.corp.nortel.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501017107@uspitsmsgusr08.win.marconi.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccaBPXATcLtYMIrSdeHzRHGN4/MQAABQXvA From: "Don Fedyk" <dwfedyk@nortel.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Joe Touch" <touch@ISI.EDU>, "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB7EXI3A028188 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 14:33:34 -0000 Status: RO Content-Length: 885 Hi Eric > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > Sent: Thursday, December 07, 2006 8:38 AM > Don, > > Thanks for doing this. As you can probably attest, > this is a non-trivial "digging" task to come up with this > level of detail. I am not sure why Joe asked for it, but now > that you have provided it, perhaps you can explain how values > would be derived for the B-TAG TCI/VID and I-TAG TCI/SID > fields if we'd like to deploy this technology in "plug-and-play" mode? I have not given much thought to plug-and-play. My advice would be learn the current semantics of the fields and see what they offer. I don't see why these fields, which offer encapsulation, backwards compatibility, Connectivity Fault Management (CFM) frames etc are any worse than similar alternatives. Don > > -- > Eric > ><snipped hopelessly garbled> Received: from smtp01.uc3m.es (smtp01.uc3m.es [163.117.136.121]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7EMhu9024220 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Thu, 7 Dec 2006 06:22:45 -0800 (PST) Received: from smtp01.uc3m.es (localhost [127.0.0.1]) by localhost.uc3m.es (Postfix) with ESMTP id 236D2111178; Thu, 7 Dec 2006 15:22:43 +0100 (CET) Received: from [10.0.0.4] (39.Red-80-37-137.staticIP.rima-tde.net [80.37.137.39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp01.uc3m.es (Postfix) with ESMTP id 5EB6C110D78; Thu, 7 Dec 2006 15:22:32 +0100 (CET) Message-ID: <457823A7.20709@it.uc3m.es> Date: Thu, 07 Dec 2006 15:22:31 +0100 From: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Stewart Bryant <stbryant@cisco.com> References: <75B2A84D9323BC4CA3977CF378CE75EB027827B3@xmb-sjc-21e.amer.cisco.com> <45771709.5050004@it.uc3m.es> <45771B66.7020009@cisco.com> In-Reply-To: <45771B66.7020009@cisco.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gibanez@it.uc3m.es Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 14:22:56 -0000 Status: RO Content-Length: 521 Yes but, could you be a bit more precise ? (there are so many "VLANs" in the headers :-) ). Do you mean a different protocol type than .1ah (81a8)? Guillermo Stewart Bryant escribi?: > Guillermo Ib??ez wrote: > >> There is no TTL field on the 802.1ah, afaik, so the .1ah would >> require modification. > > ... or perhaps extension through the header extension mechanism > used to introduce VLANs. i.e. new protocol type that introduces > the TTL header which carries the TTL and the next protocol type. > > - Stewart > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7DmOOO013125 for <rbridge@postel.org>; Thu, 7 Dec 2006 05:48:25 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB7DmHSL022785; Thu, 7 Dec 2006 08:48:17 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id IAA18856; Thu, 7 Dec 2006 08:48:16 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0TXH2>; Thu, 7 Dec 2006 08:48:15 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017114@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Joe Touch <touch@ISI.EDU>, "Ali Sajassi (sajassi)" <sajassi@cisco.com> Date: Thu, 7 Dec 2006 08:48:15 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 13:48:51 -0000 Status: RO Content-Length: 1119 Joe/Ali, It is not as simple as this. The IETF has already established a precedent for Ethernet encapsulation of SHIM-encapsulated Ethernet. It's only trying to see this as a single encapsulation, that causes people to conclude we are inventing a new form of Ethernet encapsulation. Other than inappropriate "designing committee" discussion at the last IETF meeting, we have not been attempting to design any new Ethernet encapsulation. And I believe we should safely conclude, at this point, that the discussion that took place on this topic at the TRILL meeting last month can be closed and considered to have been completely unproductive. Big surprise... -- Eric > -----Original Message----- > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] On Behalf Of Joe Touch > Sent: Wednesday, December 06, 2006 10:23 PM > To: Ali Sajassi (sajassi) > Cc: Developing a hybrid router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7DcKmR009762 for <rbridge@postel.org>; Thu, 7 Dec 2006 05:38:24 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB7DcASL022618; Thu, 7 Dec 2006 08:38:10 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id IAA18255; Thu, 7 Dec 2006 08:38:09 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0TXCD>; Thu, 7 Dec 2006 08:38:09 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501017107@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Don Fedyk <dwfedyk@nortel.com>, Joe Touch <touch@ISI.EDU>, "Ali Sajassi (sajassi)" <sajassi@cisco.com> Date: Thu, 7 Dec 2006 08:38:08 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 13:38:27 -0000 Status: RO Content-Length: 4977 Don, Thanks for doing this. As you can probably attest, this is a non-trivial "digging" task to come up with this level of detail. I am not sure why Joe asked for it, but now that you have provided it, perhaps you can explain how values would be derived for the B-TAG TCI/VID and I-TAG TCI/SID fields if we'd like to deploy this technology in "plug-and-play" mode? -- Eric > -----Original Message----- > From: Don Fedyk [mailto:dwfedyk@nortel.com] > Sent: Thursday, December 07, 2006 8:29 AM > To: Joe Touch; Ali Sajassi (sajassi) > Cc: Gray, Eric; Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Hi > > This is the Provider Backbone Header Format reproduced from one of the > 802.1ah documents. When I said this is similar to the Trill > header this > is the version I mentioned. I converted to textographics by hand so I > hope I got it right. I put field designators in [] inside the picture > for fear they would get wrapped. The encapsulated frame > starts after the > I-TAG I-SID. > > > | 1 | 2 | 3 | 4 > | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > -2 | | | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + > 2 | Backbone Destination Address [B-DA] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > 6 | Backbone Source Address [B-SA] | > + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > 10 | | .1ad Ethertype [B-TAG] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > 14 | .1ad B-TAG TCI/VID | .1ah Ethertype [ ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ I ]-+-+-+ > 18 | .1ah I-TAG TCI/SID [ - ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ T ]-+-+-+ > 22 | Customer Destination Address [ A ] | > + +-+-+-+-+-+-+-+-+-+-+-[ G ]-+-+-+ > 26 | | [ ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ [ ] + > 30 | Customer Source Address [ ] | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ ]-+-+-+ > 34 | Encap Ethertype | [ ] > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > > .1ah I-TAG TCI > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > | P/DE |R1 |R2 | I-SID | > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > > P/DE 3 Bits Priority 1 bit Drop Eligible > R1 Res1 > R2 Res2 > > a) priority - This 3 bit field carries the customer priority (I-PCP) > associated > with this frame. The provider network operates on the priority > associated with > the B-TAG. > > b) drop_eligible - This 1 bit field carries the customer drop > eligibility > (I-DEI) associated with this frame. The provider network > operates on the > drop > eligibility associated with the B-TAG. > > c) res1 - This 2 bit field is used for any future format > variations. The > res2 > field is zero on transmit and is ignored on receipt. > > d) res2 - This 2 bit field is used for any future format > variations. The > res1 > field is zero on transmit and if set on reception the frame is > discarded. > > e) I-SID - This 24 bit field carries the service instance identifier > associated > with this frame. > > f) encapsulated C-DA - This field carries the 48 bit Destination MAC > Address > for an encapsulated Ethernet frame. > > g) encapsulated C-SA - This field carries the 48 bit Source > MAC Address > for an > encapsulated Ethernet frame. > > Regards, > Don > > > > -----Original Message----- > > From: Joe Touch [mailto:touch@ISI.EDU] > > Sent: Wednesday, December 06, 2006 9:53 PM > > To: Ali Sajassi (sajassi) > > Cc: Fedyk, Don (BL60:1A00); Gray, Eric; Developing a hybrid > > router/bridge. > > Subject: Re: [rbridge] Use of 802.1ah Encaps > > > > I'd really rather someone just posted the header / fields, > > rather than a large document in which that information is > > buried, if possible ;-) > > > > Joe > > > > Ali Sajassi (sajassi) wrote: > > > > > >> Can you - or anyone with easy access to the specs - > please post an > > >> explicit description of 802.1ah header and fields? > > > > > > I will ask Tony (802.1 chair) to make avail to TRILL WG a > > copy of .1ah. > > > > > > -Ali > > > > > > > > >> Thanks, > > >> > > >> Joe > > >> > > >> > > > > -- > > ---------------------------------------- > > Joe Touch > > Sr. Network Engineer, USAF TSAT Space Segment > > > > > Received: from zcars04e.nortel.com (zcars04e.nortel.com [47.129.242.56]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7DSlb5006593 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Thu, 7 Dec 2006 05:28:48 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zcars04e.nortel.com (Switch-2.2.0/Switch-2.2.0) with ESMTP id kB7DLL803286 for <rbridge@postel.org>; Thu, 7 Dec 2006 08:21:22 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Thu, 7 Dec 2006 08:28:30 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C48C019@zrtphxm2.corp.nortel.com> In-Reply-To: <457781F1.7050103@isi.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccZqtCZNyAAgmj5QEKwnpuXlDrTygAVKArQ From: "Don Fedyk" <dwfedyk@nortel.com> To: "Joe Touch" <touch@ISI.EDU>, "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB7DSlb5006593 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 13:28:56 -0000 Status: RO Content-Length: 4076 Hi This is the Provider Backbone Header Format reproduced from one of the 802.1ah documents. When I said this is similar to the Trill header this is the version I mentioned. I converted to textographics by hand so I hope I got it right. I put field designators in [] inside the picture for fear they would get wrapped. The encapsulated frame starts after the I-TAG I-SID. | 1 | 2 | 3 | 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -2 | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + 2 | Backbone Destination Address [B-DA] | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 6 | Backbone Source Address [B-SA] | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 10 | | .1ad Ethertype [B-TAG] | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 14 | .1ad B-TAG TCI/VID | .1ah Ethertype [ ] | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ I ]-+-+-+ 18 | .1ah I-TAG TCI/SID [ - ] | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ T ]-+-+-+ 22 | Customer Destination Address [ A ] | + +-+-+-+-+-+-+-+-+-+-+-[ G ]-+-+-+ 26 | | [ ] | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ [ ] + 30 | Customer Source Address [ ] | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-[ ]-+-+-+ 34 | Encap Ethertype | [ ] +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ .1ah I-TAG TCI +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | P/DE |R1 |R2 | I-SID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ P/DE 3 Bits Priority 1 bit Drop Eligible R1 Res1 R2 Res2 a) priority - This 3 bit field carries the customer priority (I-PCP) associated with this frame. The provider network operates on the priority associated with the B-TAG. b) drop_eligible - This 1 bit field carries the customer drop eligibility (I-DEI) associated with this frame. The provider network operates on the drop eligibility associated with the B-TAG. c) res1 - This 2 bit field is used for any future format variations. The res2 field is zero on transmit and is ignored on receipt. d) res2 - This 2 bit field is used for any future format variations. The res1 field is zero on transmit and if set on reception the frame is discarded. e) I-SID - This 24 bit field carries the service instance identifier associated with this frame. f) encapsulated C-DA - This field carries the 48 bit Destination MAC Address for an encapsulated Ethernet frame. g) encapsulated C-SA - This field carries the 48 bit Source MAC Address for an encapsulated Ethernet frame. Regards, Don > -----Original Message----- > From: Joe Touch [mailto:touch@ISI.EDU] > Sent: Wednesday, December 06, 2006 9:53 PM > To: Ali Sajassi (sajassi) > Cc: Fedyk, Don (BL60:1A00); Gray, Eric; Developing a hybrid > router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > I'd really rather someone just posted the header / fields, > rather than a large document in which that information is > buried, if possible ;-) > > Joe > > Ali Sajassi (sajassi) wrote: > > > >> Can you - or anyone with easy access to the specs - please post an > >> explicit description of 802.1ah header and fields? > > > > I will ask Tony (802.1 chair) to make avail to TRILL WG a > copy of .1ah. > > > > -Ali > > > > > >> Thanks, > >> > >> Joe > >> > >> > > -- > ---------------------------------------- > Joe Touch > Sr. Network Engineer, USAF TSAT Space Segment > > Received: from smtp01.uc3m.es (smtp01.uc3m.es [163.117.136.121]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB7DGGVb002011 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Thu, 7 Dec 2006 05:16:22 -0800 (PST) Received: from smtp01.uc3m.es (localhost [127.0.0.1]) by localhost.uc3m.es (Postfix) with ESMTP id 178DA110EB9; Thu, 7 Dec 2006 14:16:16 +0100 (CET) Received: from [10.0.0.4] (39.Red-80-37-137.staticIP.rima-tde.net [80.37.137.39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp01.uc3m.es (Postfix) with ESMTP id 434B5110BC4; Thu, 7 Dec 2006 14:16:04 +0100 (CET) Message-ID: <45781418.2050405@it.uc3m.es> Date: Thu, 07 Dec 2006 14:16:08 +0100 From: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Joe Touch <touch@ISI.EDU> References: <75B2A84D9323BC4CA3977CF378CE75EB0278299B@xmb-sjc-21e.amer.cisco.com> <45778929.2090103@isi.edu> In-Reply-To: <45778929.2090103@isi.edu> Content-Type: multipart/mixed; boundary="------------010507050502060406060802" X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gibanez@it.uc3m.es Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 13:16:40 -0000 Status: RO Content-Length: 200903 This is a multi-part message in MIME format. --------------010507050502060406060802 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Attached is a figure on the 802.1ad and .1ah headers, extracted from the Comms. Magazine. You can find also more details on the fields specific of .1ah header, extracted from 802.1ah draft 3.0 Note that I-SID Instance Service ID, has three octets, possibly to overcome the limitation that a single VLAN field (12 bit: 4096) (2 byte type+ 2 byte VLAN tag)) would suppose. Guillermo Joe Touch escribi?: > Ali Sajassi (sajassi) wrote: > ... > >>>> Hmmm Trill spent 1.5 years coming up with a header that looks >>>> remarkably like 802.1ah. A fact many of us have pointed out >>>> >>> before. >>> >>>> If you are using an IEEE 802.1 Ethernet data plane your baseline >>>> choices are 802.1Q or 802.1ah. >>>> >>> Is there a TTL in the 802.1ah header? >>> >> Currently it is not. But if this is an issue, we can try to accommodate >> it. >> > > So maybe that 1.5 years wasn't wasted after all? :-) > > Joe > > > ------------------------------------------------------------------------ > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > --------------010507050502060406060802 Content-Type: application/pdf; name="8021ah_header.pdf" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="8021ah_header.pdf" JVBERi0xLjQKJcfsj6IKNSAwIG9iago8PC9MZW5ndGggNiAwIFIvRmlsdGVyIC9GbGF0ZURl Y29kZT4+CnN0cmVhbQp4nCtUMNAzNFIwAEEYIzmXSz/IXCG9mKuQy8jIQs/S0kzB1MBcz9LQ RCEXLmIGEVLI4TIxN7JE58LU53BlcIUr5HEVAs01MwBaoGtiZmgM5JiYAxVDVFlAbLRQcMnn CgRDAPIbHkplbmRzdHJlYW0KZW5kb2JqCjYgMCBvYmoKMTAyCmVuZG9iago0IDAgb2JqCjw8 L1R5cGUvUGFnZS9NZWRpYUJveCBbMCAwIDU5NSA4NDJdCi9Sb3RhdGUgOTAvUGFyZW50IDMg MCBSCi9SZXNvdXJjZXM8PC9Qcm9jU2V0Wy9QREYgL0ltYWdlQ10KL0V4dEdTdGF0ZSA5IDAg 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<45778929.2090103@isi.edu> Date: Wed, 06 Dec 2006 19:23:21 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> References: <75B2A84D9323BC4CA3977CF378CE75EB0278299B@xmb-sjc-21e.amer.cisco.com> In-Reply-To: <75B2A84D9323BC4CA3977CF378CE75EB0278299B@xmb-sjc-21e.amer.cisco.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig4E8B82C6F235020C0C63480F" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 03:24:58 -0000 Status: RO Content-Length: 1184 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig4E8B82C6F235020C0C63480F Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Ali Sajassi (sajassi) wrote: =2E.. >>> Hmmm Trill spent 1.5 years coming up with a header that looks=20 >>> remarkably like 802.1ah. A fact many of us have pointed out=20 >> before. =20 >>> If you are using an IEEE 802.1 Ethernet data plane your baseline=20 >>> choices are 802.1Q or 802.1ah. >> Is there a TTL in the 802.1ah header? >=20 > Currently it is not. But if this is an issue, we can try to accommodate= > it. So maybe that 1.5 years wasn't wasted after all? :-) Joe --------------enig4E8B82C6F235020C0C63480F Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFd4kqE5f5cImnZrsRAjD3AJ4029IPekUiy+0QfttWemsWQPGuLgCg15hQ +kKgAEzoz+r8eWA3tfOSPm4= =O4WQ -----END PGP SIGNATURE----- --------------enig4E8B82C6F235020C0C63480F-- Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB72r3tS000982 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Wed, 6 Dec 2006 18:53:03 -0800 (PST) Received: from [127.0.0.1] (pool-71-106-94-15.lsanca.dsl-w.verizon.net [71.106.94.15]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kB72qZ8R019407; Wed, 6 Dec 2006 18:52:36 -0800 (PST) Message-ID: <457781F1.7050103@isi.edu> Date: Wed, 06 Dec 2006 18:52:33 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> References: <75B2A84D9323BC4CA3977CF378CE75EB02782997@xmb-sjc-21e.amer.cisco.com> In-Reply-To: <75B2A84D9323BC4CA3977CF378CE75EB02782997@xmb-sjc-21e.amer.cisco.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig0662071E35908E95EF411E3D" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Thu, 07 Dec 2006 02:53:16 -0000 Status: RO Content-Length: 1244 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig0662071E35908E95EF411E3D Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I'd really rather someone just posted the header / fields, rather than a large document in which that information is buried, if possible ;-) Joe Ali Sajassi (sajassi) wrote: >=20 >> Can you - or anyone with easy access to the specs - please=20 >> post an explicit description of 802.1ah header and fields? >=20 > I will ask Tony (802.1 chair) to make avail to TRILL WG a copy of .1ah.= >=20 > -Ali >=20 >=20 >> Thanks, >> >> Joe >> >> --=20 ---------------------------------------- Joe Touch Sr. Network Engineer, USAF TSAT Space Segment --------------enig0662071E35908E95EF411E3D Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFd4HxE5f5cImnZrsRAppSAKC1nA1xpwJhZ5VgJobH/v90qHyRnACeNjA3 T6BChI8VyvApqIdMZT/+5Ck= =Tj9A -----END PGP SIGNATURE----- --------------enig0662071E35908E95EF411E3D-- Received: from mail128.messagelabs.com (mail128.messagelabs.com [216.82.250.131]) by boreas.isi.edu (8.13.8/8.13.8) with SMTP id kB6KOTd6007419 for <rbridge@postel.org>; Wed, 6 Dec 2006 12:24:29 -0800 (PST) X-VirusChecked: Checked X-Env-Sender: Donald.Eastlake@motorola.com X-Msg-Ref: server-7.tower-128.messagelabs.com!1165436650!5357136!1 X-StarScan-Version: 5.5.10.7; banners=-,-,- X-Originating-IP: [129.188.136.9] Received: (qmail 2764 invoked from network); 6 Dec 2006 20:24:10 -0000 Received: from ftpbox.mot.com (HELO ftpbox.mot.com) (129.188.136.9) by server-7.tower-128.messagelabs.com with SMTP; 6 Dec 2006 20:24:10 -0000 Received: from az33exr04.mot.com ([10.64.251.234]) by ftpbox.mot.com (8.12.11/Motorola) with ESMTP id kB6KO9Nb012109 for <rbridge@postel.org>; Wed, 6 Dec 2006 14:24:09 -0600 (CST) Received: from de01exm64.ds.mot.com (de01exm64.am.mot.com [10.176.8.15]) by az33exr04.mot.com (8.13.1/8.13.0) with ESMTP id kB6KO8vD021081 for <rbridge@postel.org>; Wed, 6 Dec 2006 14:24:08 -0600 (CST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 6 Dec 2006 15:24:07 -0500 Message-ID: <3870C46029D1F945B1472F170D2D979001C90D36@de01exm64.ds.mot.com> In-Reply-To: <34B3EAA5B3066A42914D28C5ECF5FEA40C435E0F@zrtphxm2.corp.nortel.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccZPMYd8D/bp9TwSwi9vsnIHqHTvwAEjT2QAAW/QnA= From: "Eastlake III Donald-LDE008" <Donald.Eastlake@motorola.com> To: "Developing a hybrid router/bridge." <rbridge@postel.org> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: donald.eastlake@motorola.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6KOTd6007419 Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 20:24:44 -0000 Status: RO Content-Length: 2542 Hi Don, See below at @@@ -----Original Message----- From: rbridge-bounces@postel.org [mailto:rbridge-bounces@postel.org] On Behalf Of Don Fedyk Sent: Wednesday, December 06, 2006 11:15 AM To: Gray, Eric; Ali Sajassi (sajassi) Cc: Developing a hybrid router/bridge. Subject: Re: [rbridge] Use of 802.1ah Encaps Hi Eric > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Ali/Don, > > The use of 802.1ah encapsulation does not intuitively suggest itself > in the TRILL problem domain for at least two > reasons: > > 1) Provider Back-bone Bridging intuitively seems out of > place in solutions aimed at enterprise networks - and > this would seem to be even more true for solutions > aimed at "plug-and-play" applicability. Hmmm Trill spent 1.5 years coming up with a header that looks remarkably like 802.1ah. A fact many of us have pointed out before. If you are using an IEEE 802.1 Ethernet data plane your baseline choices are 802.1Q or 802.1ah. @@@ That might be the baseline in IEEE 802.1 but I don't think it is in IETF TRILL. I think the TRILL Charter states that our baseline is draft-perlman-rbridge-03.txt, still available at http://www.postel.org/rbridge/draft-perlman-rbridge-03.txt, although that draft is not very specific about the encapsulation format. @@@ Of course we can and have evolved from that baseline. (For example, I assess the WG as leaning very strongly to the inclusion of two rbridge designators.) And if there is an existing encapsulation format that meets our needs, there is no particular reason to invent one. That is why we were planning for a while on using an MPLS format. But 802.1ah does not look much like the Rbridge shim (or Rbridge shim plus following MAC addresses) to me. Perhaps I am just missing something but have the "many" people you say have "pointed out" that we should just use the 802.1ah header actually proposed a specific allocation of its fields? (for current ideas on Rbridge shim fields look at presentations in San Diego such as http://www3.ietf.org/proceedings/06nov/slides/trill-2/sld2.htm or http://www3.ietf.org/proceedings/06nov/slides/trill-3/sld8.htm) @@@ I would point out that, when we were discussing the MPLS encapsulation, some who had originally advocated it as a way of re-using hardware and the like later came to the conclusion that if it had to have a different Ethertype and/or fields that are differently interpreted, there was actually very little saving. @@@ Thanks, @@@ Donald ... > > > Regards, > > > Don Received: from sj-iport-5.cisco.com (sj-iport-5.cisco.com [171.68.10.87]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6JZ3jm018952 for <rbridge@postel.org>; Wed, 6 Dec 2006 11:35:03 -0800 (PST) Received: from sj-dkim-8.cisco.com ([171.68.10.93]) by sj-iport-5.cisco.com with ESMTP; 06 Dec 2006 11:35:03 -0800 Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-8.cisco.com (8.12.11/8.12.11) with ESMTP id kB6JZ2P6023360; Wed, 6 Dec 2006 11:35:02 -0800 Received: from [171.70.246.18] ([171.70.246.18]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id kB6JZ2in004332; Wed, 6 Dec 2006 11:35:02 -0800 (PST) Message-ID: <45771B66.7020009@cisco.com> Date: Wed, 06 Dec 2006 19:35:02 +0000 From: Stewart Bryant <stbryant@cisco.com> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> References: <75B2A84D9323BC4CA3977CF378CE75EB027827B3@xmb-sjc-21e.amer.cisco.com> <45771709.5050004@it.uc3m.es> In-Reply-To: <45771709.5050004@it.uc3m.es> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=329; t=1165433702; x=1166297702; c=relaxed/relaxed; s=sjdkim8002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=stbryant@cisco.com; z=From:=20Stewart=20Bryant=20<stbryant@cisco.com> |Subject:=20Re=3A=20[rbridge]=20Draft=20minutes=20posted |Sender:=20; bh=WVp04eA4VQs3zZwSVNf30lfvhw8oq+4qEV7bWt+CST8=; b=B2zO86/FtpsOcBAkponlkGzKRRRJ0DH+Ka24b6zZdN5GqwxvrXjkTceD1Stj8sIipFR9p78z KcTV6SJTr4vVMSGSrM/ikBeNm4PgKPRf/r+/WsBARL+r+QArvE/d2j6c; Authentication-Results: sj-dkim-8; header.From=stbryant@cisco.com; dkim=pass ( sig from cisco.com/sjdkim8002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: stbryant@cisco.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 19:35:17 -0000 Status: RO Content-Length: 321 Guillermo Ib??ez wrote: > There is no TTL field on the 802.1ah, afaik, so the .1ah would require > modification. ... or perhaps extension through the header extension mechanism used to introduce VLANs. i.e. new protocol type that introduces the TTL header which carries the TTL and the next protocol type. - Stewart Received: from zrtps0kp.nortel.com (zrtps0kp.nortel.com [47.140.192.56]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6JYsgI018845 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Wed, 6 Dec 2006 11:34:54 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id kB6JYpV24568 for <rbridge@postel.org>; Wed, 6 Dec 2006 14:34:51 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 6 Dec 2006 14:34:49 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C48B6FD@zrtphxm2.corp.nortel.com> In-Reply-To: <457705C7.1020706@sun.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Draft minutes posted Thread-Index: AccZYMHUilofPKQLToimUhGvFOmzjAADFkPw From: "Don Fedyk" <dwfedyk@nortel.com> To: "Erik Nordmark" <erik.nordmark@sun.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6JYsgI018845 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 19:35:08 -0000 Status: RO Content-Length: 870 Hi Erik See I addition below: > -----Original Message----- > From: Erik Nordmark [mailto:erik.nordmark@sun.com] > Sent: Wednesday, December 06, 2006 1:03 PM > > Don Fedyk wrote: > > Hi Erik > > > > In the minutes: > > 802.1ah header synergy? On this point myself, and I recall Ali > > Sajassi and Donald Oconnor all stood up and said that > 802.1ah is going > > to be a standard encapsulation header. My point was Trill > should see > > what it could deliver on this encapsulation before > inventing similar > > but different headers. > > I've added this: > > "802.1ah header synergy? > Comments from Don Fedyk, Ali Sajassi and Donald Oconnor that > 802.1ah is going to be a standard encapsulation header." > > which is what I think you said that you said. Correct and the fact that we think it should be looked at by Trill. Don > > Erik > Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6JWA6Y017392 for <rbridge@postel.org>; Wed, 6 Dec 2006 11:32:11 -0800 (PST) Received: from sj-dkim-7.cisco.com ([171.68.10.88]) by sj-iport-4.cisco.com with ESMTP; 06 Dec 2006 11:32:10 -0800 Received: from sj-core-4.cisco.com (sj-core-4.cisco.com [171.68.223.138]) by sj-dkim-7.cisco.com (8.12.11/8.12.11) with ESMTP id kB6JWAgi002002; Wed, 6 Dec 2006 11:32:10 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-4.cisco.com (8.12.10/8.12.6) with ESMTP id kB6JVxOn010361; Wed, 6 Dec 2006 11:32:10 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 6 Dec 2006 11:32:08 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Date: Wed, 6 Dec 2006 11:32:07 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB027829AD@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Draft minutes posted Thread-Index: AccZaxGET+Wkqg3dTj2DPqJIyAx2EAAAc7hA From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: =?iso-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> X-OriginalArrivalTime: 06 Dec 2006 19:32:08.0591 (UTC) FILETIME=[380DD9F0:01C7196D] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=1731; t=1165433530; x=1166297530; c=relaxed/simple; s=sjdkim7002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Draft=20minutes=20posted |Sender:=20; bh=IzjW4GtI6P//ZeRA8lqHldvk6YdUSYo9Rvi3pdLVzz4=; b=KSi7oc9EvcNtDMlcI6QPDnoduhT9uwPmCPGnSFjJQXwkxrRC1WAlAHH947bOijSVhEsJLXBi qK2ZnvVvXnXxrLhGsTONOn1zhpmRySJOeUK6BG7Ix4WpfcTnXTzLYYig; Authentication-Results: sj-dkim-7; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim7002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6JWA6Y017392 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 19:32:24 -0000 Status: RO Content-Length: 1621 > > There is no TTL field on the 802.1ah, afaik, so the .1ah > would require modification. As mentioned in my previous email, if this is an issue, we can try to accommodate it. Is there anything else ? -Ali > Guillermo > > Ali Sajassi (sajassi) escribi?: > > > > > > > > Yes, if there is any reason as to why .1ah encap cannot be > used, then > > I would like to hear it. > > > > -Ali > > > > > > > >> -----Original Message----- > >> From: rbridge-bounces@postel.org > >> [mailto:rbridge-bounces@postel.org] On Behalf Of Don Fedyk > >> Sent: Tuesday, December 05, 2006 10:17 AM > >> To: Developing a hybrid router/bridge. > >> Subject: Re: [rbridge] Draft minutes posted > >> > >> Hi Erik > >> > >> In the minutes: > >> 802.1ah header synergy? On this point myself, and I recall Ali > >> Sajassi and Donald Oconnor all stood up and said that 802.1ah is > >> going to be a standard encapsulation header. My point was Trill > >> should see what it could deliver on this encapsulation before > >> inventing similar but different headers. > >> > >> Regards, > >> Don > >> > >>> -----Original Message----- > >>> From: rbridge-bounces@postel.org > >>> At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > >>> > >>> Any corrections? > >>> > >>> Erik > >>> > >> _______________________________________________ > >> rbridge mailing list > >> rbridge@postel.org > >> http://mailman.postel.org/mailman/listinfo/rbridge > >> > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6JS96V016157 for <rbridge@postel.org>; Wed, 6 Dec 2006 11:28:09 -0800 (PST) Received: from sj-dkim-8.cisco.com ([171.68.10.93]) by sj-iport-4.cisco.com with ESMTP; 06 Dec 2006 11:28:09 -0800 Received: from sj-core-3.cisco.com (sj-core-3.cisco.com [171.68.223.137]) by sj-dkim-8.cisco.com (8.12.11/8.12.11) with ESMTP id kB6JS9kF014391; Wed, 6 Dec 2006 11:28:09 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-3.cisco.com (8.12.10/8.12.6) with ESMTP id kB6JS8dG027307; Wed, 6 Dec 2006 11:28:08 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 6 Dec 2006 11:28:08 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 6 Dec 2006 11:28:07 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB0278299B@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccZYKA7mHaAoLXEQX+ZRMgNjCjqtwAC8cTg From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Erik Nordmark" <erik.nordmark@sun.com>, "Don Fedyk" <dwfedyk@nortel.com> X-OriginalArrivalTime: 06 Dec 2006 19:28:08.0160 (UTC) FILETIME=[A8BEFE00:01C7196C] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=1253; t=1165433289; x=1166297289; c=relaxed/relaxed; s=sjdkim8002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=y8hLkr+63G+1SvEpc4Qp+qaqdeGCU0jJA0sTAMY+vUI=; b=f4WK9c4iUMIlLmjwCNWSOP7XbqgJZyHgGGyNPlTuj+2Okz3MFNAkbju+2fzDoFvyumUc5ZOQ Q6Da+2dmp9RBNeWwD3zUys3Jj2uktLV+cg+iZJi/A1N6CIwzKCc2pu7n; Authentication-Results: sj-dkim-8; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim8002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6JS96V016157 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 19:28:30 -0000 Status: RO Content-Length: 1189 > -----Original Message----- > From: Erik Nordmark [mailto:erik.nordmark@sun.com] > Sent: Wednesday, December 06, 2006 10:02 AM > To: Don Fedyk > Cc: Gray, Eric; Ali Sajassi (sajassi); Developing a hybrid > router/bridge. > Subject: Re: [rbridge] Use of 802.1ah Encaps > > Don Fedyk wrote: > > Hi Eric > > > >> -----Original Message----- > >> From: Gray, Eric [mailto:Eric.Gray@marconi.com] > >> > >> Ali/Don, > >> > >> The use of 802.1ah encapsulation does not intuitively > suggest itself > >> in the TRILL problem domain for at least two > >> reasons: > >> > >> 1) Provider Back-bone Bridging intuitively seems out of > >> place in solutions aimed at enterprise networks - and > >> this would seem to be even more true for solutions > >> aimed at "plug-and-play" applicability. > > Hmmm Trill spent 1.5 years coming up with a header that looks > > remarkably like 802.1ah. A fact many of us have pointed out > before. > > If you are using an IEEE 802.1 Ethernet data plane your baseline > > choices are 802.1Q or 802.1ah. > > Is there a TTL in the 802.1ah header? Currently it is not. But if this is an issue, we can try to accommodate it. -Ali > > Erik > Received: from sj-iport-5.cisco.com (sj-iport-5.cisco.com [171.68.10.87]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6JPuZS015073 for <rbridge@postel.org>; Wed, 6 Dec 2006 11:25:56 -0800 (PST) Received: from sj-dkim-7.cisco.com ([171.68.10.88]) by sj-iport-5.cisco.com with ESMTP; 06 Dec 2006 11:25:57 -0800 Received: from sj-core-2.cisco.com (sj-core-2.cisco.com [171.71.177.254]) by sj-dkim-7.cisco.com (8.12.11/8.12.11) with ESMTP id kB6JPuIG026664; Wed, 6 Dec 2006 11:25:56 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-2.cisco.com (8.12.10/8.12.6) with ESMTP id kB6JPuin027231; Wed, 6 Dec 2006 11:25:56 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 6 Dec 2006 11:25:55 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 6 Dec 2006 11:25:54 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB02782997@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccZW56xelgfAKXqRcGLtqnunRzK1wAD12DQ From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Joe Touch" <touch@ISI.EDU>, "Don Fedyk" <dwfedyk@nortel.com> X-OriginalArrivalTime: 06 Dec 2006 19:25:55.0960 (UTC) FILETIME=[59F2DF80:01C7196C] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=266; t=1165433156; x=1166297156; c=relaxed/simple; s=sjdkim7002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=uaKWM3mKL4eRvXMrNcq6cbebpsmjCMWZ3qNQmjDszsU=; b=gbgKRfPrtotSBE3/YEusF8ULVvaMgBR/0baLw5co55H0vJa6Je6m16KQFK9kX/IjKPbtzlTw IMMc0N0+9Qtw7h/SsEZRIPEZjLpGWcxO7qgBfDLhyvBJCtdCbxKES+sq; Authentication-Results: sj-dkim-7; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim7002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6JPuZS015073 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 19:26:11 -0000 Status: RO Content-Length: 238 > > Can you - or anyone with easy access to the specs - please > post an explicit description of 802.1ah header and fields? I will ask Tony (802.1 chair) to make avail to TRILL WG a copy of .1ah. -Ali > > Thanks, > > Joe > > Received: from smtp02.uc3m.es (smtp02.uc3m.es [163.117.136.122]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6JGTH8011394 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Wed, 6 Dec 2006 11:16:31 -0800 (PST) Received: from smtp02.uc3m.es (localhost [127.0.0.1]) by localhost.uc3m.es (Postfix) with ESMTP id B3DD8C8B39; Wed, 6 Dec 2006 20:16:28 +0100 (CET) Received: from [10.0.0.4] (39.Red-80-37-137.staticIP.rima-tde.net [80.37.137.39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp02.uc3m.es (Postfix) with ESMTP id A5A65C8E10; Wed, 6 Dec 2006 20:16:25 +0100 (CET) Message-ID: <45771709.5050004@it.uc3m.es> Date: Wed, 06 Dec 2006 20:16:25 +0100 From: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: "Ali Sajassi (sajassi)" <sajassi@cisco.com> References: <75B2A84D9323BC4CA3977CF378CE75EB027827B3@xmb-sjc-21e.amer.cisco.com> In-Reply-To: <75B2A84D9323BC4CA3977CF378CE75EB027827B3@xmb-sjc-21e.amer.cisco.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gibanez@it.uc3m.es Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 19:17:10 -0000 Status: RO Content-Length: 1385 There is no TTL field on the 802.1ah, afaik, so the .1ah would require modification. Guillermo Ali Sajassi (sajassi) escribi?: > > > > Yes, if there is any reason as to why .1ah encap cannot be used, then I > would like to hear it. > > -Ali > > > >> -----Original Message----- >> From: rbridge-bounces@postel.org >> [mailto:rbridge-bounces@postel.org] On Behalf Of Don Fedyk >> Sent: Tuesday, December 05, 2006 10:17 AM >> To: Developing a hybrid router/bridge. >> Subject: Re: [rbridge] Draft minutes posted >> >> Hi Erik >> >> In the minutes: >> 802.1ah header synergy? On this point myself, and I recall >> Ali Sajassi and Donald Oconnor all stood up and said that >> 802.1ah is going to be a standard encapsulation header. My >> point was Trill should see what it could deliver on this >> encapsulation before inventing similar but different headers. >> >> Regards, >> Don >> >>> -----Original Message----- >>> From: rbridge-bounces@postel.org >>> At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt >>> >>> Any corrections? >>> >>> Erik >>> >> _______________________________________________ >> rbridge mailing list >> rbridge@postel.org >> http://mailman.postel.org/mailman/listinfo/rbridge >> > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from sj-iport-5.cisco.com (sj-iport-5.cisco.com [171.68.10.87]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6JFslv011181 for <rbridge@postel.org>; Wed, 6 Dec 2006 11:15:54 -0800 (PST) Received: from sj-dkim-8.cisco.com ([171.68.10.93]) by sj-iport-5.cisco.com with ESMTP; 06 Dec 2006 11:15:54 -0800 Received: from sj-core-4.cisco.com (sj-core-4.cisco.com [171.68.223.138]) by sj-dkim-8.cisco.com (8.12.11/8.12.11) with ESMTP id kB6JFsZs032456; Wed, 6 Dec 2006 11:15:54 -0800 Received: from xbh-sjc-211.amer.cisco.com (xbh-sjc-211.cisco.com [171.70.151.144]) by sj-core-4.cisco.com (8.12.10/8.12.6) with ESMTP id kB6JFcP3028739; Wed, 6 Dec 2006 11:15:53 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 6 Dec 2006 11:15:52 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 6 Dec 2006 11:15:51 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB0278297C@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccZPMISiu/qE23YTQeGuBAnTbgHTAALGceg From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Don Fedyk" <dwfedyk@nortel.com> X-OriginalArrivalTime: 06 Dec 2006 19:15:52.0116 (UTC) FILETIME=[F2079740:01C7196A] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=4188; t=1165432554; x=1166296554; c=relaxed/relaxed; s=sjdkim8002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=I3IPAzmjIIa7FbP4k9PHdl+pPSLS4fsvomTbr+Yqjhw=; b=DPanxpPHw026qbV3Un24he/EWmXpDC++7qvQqZYBJJkOERP45qLh4ypcBtNMab+3zPxb8Uc9 B4y5KZKIHS56DyKyhlD4a/SYU+NVTqDksdEZmmZT3KOcfop5WHSlLVZD; Authentication-Results: sj-dkim-8; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim8002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6JFslv011181 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 19:16:21 -0000 Status: RO Content-Length: 3981 Eric, > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > Sent: Wednesday, December 06, 2006 5:45 AM > To: Ali Sajassi (sajassi); Don Fedyk > Cc: Developing a hybrid router/bridge. > Subject: RE: [rbridge] Use of 802.1ah Encaps > > Ali/Don, > > The use of 802.1ah encapsulation does not intuitively > suggest itself in the TRILL problem domain for at least two > reasons: > > 1) Provider Back-bone Bridging intuitively seems out of > place in solutions aimed at enterprise networks - and > this would seem to be even more true for solutions > aimed at "plug-and-play" applicability. 802.1ah can equally be used in enterprise network with the same plug-and-play ease of use. If you think otherwise, please elaborate what part of 802.1ah is not suitable for such applications. > > 2) Use of 802.1ah encapsulation assumes "bridging" of the > tunneled frame transparently from edge-to-edge - and > this would seem to go counter to the idea of using a > link-state routing protocol for shortest path routing > of MAC frames. > 802.1ah primarily specifies the data-plane functionality. The use of link-state control-plane is independent from data-plane specification and one can easily use a link-state routing protocol with 802.1ah encap. As the mater of fact 802.aq is a step in this direction and this would be an area of mutual interest between the two working groups. > That said, the minute that we start suggesting that an > enterprise is large enough to require using service provider > (like) solutions (in particular, requiring a substantial > back-bone capacity, and assuming static configuration as a > means to ensure deterministic network behavior) - OR that we > might in fact use some form of spanning tree forwarding - it > then becomes clear that we should consider using 802.1ah. It > is certainly the case that we should not be defining another > Ethernet encapsulation explicitly to solve the same problem. As mentioned before, the use of 802.1ah does not mandate the use of spanning tree - link-state protocol can be used as well with the same plug-and-play objectives. I think the convergence in here is a good thing and the industry can benefit as whole. -Ali > > -- > Eric > > > -----Original Message----- > > From: rbridge-bounces@postel.org > > [mailto:rbridge-bounces@postel.org] On Behalf Of Ali > Sajassi (sajassi) > > Sent: Wednesday, December 06, 2006 2:39 AM > > To: Don Fedyk; Developing a hybrid router/bridge. > > Subject: Re: [rbridge] Draft minutes posted > > > > > > > > > > Yes, if there is any reason as to why .1ah encap cannot be > > used, then I > > would like to hear it. > > > > -Ali > > > > > > > > > -----Original Message----- > > > From: rbridge-bounces@postel.org > > > [mailto:rbridge-bounces@postel.org] On Behalf Of Don Fedyk > > > Sent: Tuesday, December 05, 2006 10:17 AM > > > To: Developing a hybrid router/bridge. > > > Subject: Re: [rbridge] Draft minutes posted > > > > > > Hi Erik > > > > > > In the minutes: > > > 802.1ah header synergy? On this point myself, and I recall > > > Ali Sajassi and Donald Oconnor all stood up and said that > > > 802.1ah is going to be a standard encapsulation header. My > > > point was Trill should see what it could deliver on this > > > encapsulation before inventing similar but different headers. > > > > > > Regards, > > > Don > > > > > > > -----Original Message----- > > > > From: rbridge-bounces@postel.org > > > > At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > > > > > > > > Any corrections? > > > > > > > > Erik > > > > > > > > > > _______________________________________________ > > > rbridge mailing list > > > rbridge@postel.org > > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > Received: from nwkea-mail-5.sun.com (nwkea-mail-5.sun.com [192.18.42.27]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6I2t4d015477 for <rbridge@postel.org>; Wed, 6 Dec 2006 10:02:55 -0800 (PST) Received: from jurassic.eng.sun.com ([129.146.226.31]) by nwkea-mail-5.sun.com (8.13.6+Sun/8.12.9) with ESMTP id kB6I2pAq021050; Wed, 6 Dec 2006 10:02:51 -0800 (PST) Received: from [192.9.61.11] (punchin-nordmark.SFBay.Sun.COM [192.9.61.11]) by jurassic.eng.sun.com (8.13.8+Sun/8.13.8) with ESMTP id kB6I2okQ347873 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 6 Dec 2006 10:02:51 -0800 (PST) Message-ID: <457705C7.1020706@sun.com> Date: Wed, 06 Dec 2006 10:02:47 -0800 From: Erik Nordmark <erik.nordmark@sun.com> User-Agent: Thunderbird 1.5.0.5 (X11/20060911) MIME-Version: 1.0 To: Don Fedyk <dwfedyk@nortel.com> References: <34B3EAA5B3066A42914D28C5ECF5FEA40C3ED845@zrtphxm2.corp.nortel.com> In-Reply-To: <34B3EAA5B3066A42914D28C5ECF5FEA40C3ED845@zrtphxm2.corp.nortel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: erik.nordmark@sun.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 18:03:08 -0000 Status: RO Content-Length: 574 Don Fedyk wrote: > Hi Erik > > In the minutes: > 802.1ah header synergy? On this point myself, and I recall Ali Sajassi > and Donald Oconnor all stood up and said that 802.1ah is going to be a > standard encapsulation header. My point was Trill should see what it > could deliver on this encapsulation before inventing similar but > different headers. I've added this: "802.1ah header synergy? Comments from Don Fedyk, Ali Sajassi and Donald Oconnor that 802.1ah is going to be a standard encapsulation header." which is what I think you said that you said. Erik Received: from nwkea-mail-5.sun.com (nwkea-mail-5.sun.com [192.18.42.27]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6I23eU015028 for <rbridge@postel.org>; Wed, 6 Dec 2006 10:02:03 -0800 (PST) Received: from jurassic.eng.sun.com ([129.146.226.31]) by nwkea-mail-5.sun.com (8.13.6+Sun/8.12.9) with ESMTP id kB6I1sN7020358; Wed, 6 Dec 2006 10:01:54 -0800 (PST) Received: from [192.9.61.11] (punchin-nordmark.SFBay.Sun.COM [192.9.61.11]) by jurassic.eng.sun.com (8.13.8+Sun/8.13.8) with ESMTP id kB6I1rFo347605 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 6 Dec 2006 10:01:53 -0800 (PST) Message-ID: <45770591.7010809@sun.com> Date: Wed, 06 Dec 2006 10:01:53 -0800 From: Erik Nordmark <erik.nordmark@sun.com> User-Agent: Thunderbird 1.5.0.5 (X11/20060911) MIME-Version: 1.0 To: Don Fedyk <dwfedyk@nortel.com> References: <34B3EAA5B3066A42914D28C5ECF5FEA40C435E0F@zrtphxm2.corp.nortel.com> In-Reply-To: <34B3EAA5B3066A42914D28C5ECF5FEA40C435E0F@zrtphxm2.corp.nortel.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: erik.nordmark@sun.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 18:02:25 -0000 Status: RO Content-Length: 770 Don Fedyk wrote: > Hi Eric > >> -----Original Message----- >> From: Gray, Eric [mailto:Eric.Gray@marconi.com] >> >> Ali/Don, >> >> The use of 802.1ah encapsulation does not intuitively >> suggest itself in the TRILL problem domain for at least two >> reasons: >> >> 1) Provider Back-bone Bridging intuitively seems out of >> place in solutions aimed at enterprise networks - and >> this would seem to be even more true for solutions >> aimed at "plug-and-play" applicability. > Hmmm Trill spent 1.5 years coming up with a header that looks remarkably > like 802.1ah. A fact many of us have pointed out before. If you are > using an IEEE 802.1 Ethernet data plane your baseline choices are 802.1Q > or 802.1ah. Is there a TTL in the 802.1ah header? Erik Received: from sj-iport-4.cisco.com (sj-iport-4.cisco.com [171.68.10.86]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6HnptD011083 for <rbridge@postel.org>; Wed, 6 Dec 2006 09:49:51 -0800 (PST) Received: from sj-dkim-1.cisco.com ([171.71.179.21]) by sj-iport-4.cisco.com with ESMTP; 06 Dec 2006 09:49:51 -0800 Received: from sj-core-1.cisco.com (sj-core-1.cisco.com [171.71.177.237]) by sj-dkim-1.cisco.com (8.12.11/8.12.11) with ESMTP id kB6HnpHe011188; Wed, 6 Dec 2006 09:49:51 -0800 Received: from [171.70.248.95] ([171.70.248.95]) by sj-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id kB6Hnoio017207; Wed, 6 Dec 2006 09:49:51 -0800 (PST) Message-ID: <457702BE.4050005@cisco.com> Date: Wed, 06 Dec 2006 17:49:50 +0000 From: Stewart Bryant <stbryant@cisco.com> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Gray, Eric" <Eric.Gray@marconi.com> References: <0BF76B30C100624BA997C9CED19D812501016EAD@uspitsmsgusr08.win.marconi.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501016EAD@uspitsmsgusr08.win.marconi.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=934; t=1165427391; x=1166291391; c=relaxed/simple; s=sjdkim1002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=stbryant@cisco.com; z=From:=20Stewart=20Bryant=20<stbryant@cisco.com> |Subject:=20Re=3A=20[rbridge]=20Use=20of=20802.1ah=20Encaps |Sender:=20; bh=gPdzv9O6OQ8xDNO98F7BkIz6aw5/7IMyXgNgvWvtpnE=; b=EyiIlC0mBIma0ThLUCSqL+J0OK0ELmkXKHvOypkXdGKk9/fO7m82Op9mAaZOR0Xaohq2DB26 tKZm4tep3gS2ZXmlgAbFAx3osxRg3Ln+pRa6ozvTDebm3UOTeIlKtYyi; Authentication-Results: sj-dkim-1; header.From=stbryant@cisco.com; dkim=pass ( sig from cisco.com/sjdkim1002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: stbryant@cisco.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 17:50:13 -0000 Status: RO Content-Length: 907 Gray, Eric wrote: > Ali/Don, > > The use of 802.1ah encapsulation does not intuitively > suggest itself in the TRILL problem domain for at least two > reasons: > > 1) Provider Back-bone Bridging intuitively seems out of > place in solutions aimed at enterprise networks - and > this would seem to be even more true for solutions > aimed at "plug-and-play" applicability. ... but what has that to do with the encapsulation mechanism? > > 2) Use of 802.1ah encapsulation assumes "bridging" of the > tunneled frame transparently from edge-to-edge - and > this would seem to go counter to the idea of using a > link-state routing protocol for shortest path routing > of MAC frames. Why so? There are many existance proofs that the choice of encap and the choice of topology protocol are othogonal. The only requirement is that the encap carries the necessary per packet information. - Stewart Received: from vapor.isi.edu (vapor.isi.edu [128.9.64.64]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6HQB5B003225 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Wed, 6 Dec 2006 09:26:11 -0800 (PST) Received: from [127.0.0.1] (132.sub-75-215-136.myvzw.com [75.215.136.132]) by vapor.isi.edu (8.13.8/8.13.8) with ESMTP id kB6HPVja016292; Wed, 6 Dec 2006 09:25:33 -0800 (PST) Message-ID: <4576FD05.1080807@isi.edu> Date: Wed, 06 Dec 2006 09:25:25 -0800 From: Joe Touch <touch@ISI.EDU> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Don Fedyk <dwfedyk@nortel.com> References: <34B3EAA5B3066A42914D28C5ECF5FEA40C435E0F@zrtphxm2.corp.nortel.com> In-Reply-To: <34B3EAA5B3066A42914D28C5ECF5FEA40C435E0F@zrtphxm2.corp.nortel.com> X-Enigmail-Version: 0.94.0.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig5076F6CDAD914F067DF8D487" X-ISI-4-43-8-MailScanner: Found to be clean, Found to be clean X-MailScanner-From: touch@isi.edu Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 17:26:32 -0000 Status: RO Content-Length: 953 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig5076F6CDAD914F067DF8D487 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Don Fedyk wrote: =2E.. > Hmmm Trill spent 1.5 years coming up with a header that looks remarkabl= y > like 802.1ah. Can you - or anyone with easy access to the specs - please post an explicit description of 802.1ah header and fields? Thanks, Joe --------------enig5076F6CDAD914F067DF8D487 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFdv0FE5f5cImnZrsRAqQIAJ9zvkKukM2THg0ez7Z0o3ekyz8dnQCfcjRX fbU77KQi8gqWcULtTiHMb3w= =yKwg -----END PGP SIGNATURE----- --------------enig5076F6CDAD914F067DF8D487-- Received: from mail119.messagelabs.com (mail119.messagelabs.com [216.82.241.179]) by boreas.isi.edu (8.13.8/8.13.8) with SMTP id kB6Gp8UT021454 for <rbridge@postel.org>; Wed, 6 Dec 2006 08:51:09 -0800 (PST) X-VirusChecked: Checked X-Env-Sender: Donald.Eastlake@motorola.com X-Msg-Ref: server-13.tower-119.messagelabs.com!1165423865!16495206!1 X-StarScan-Version: 5.5.10.7; banners=-,-,- X-Originating-IP: [129.188.136.8] Received: (qmail 7059 invoked from network); 6 Dec 2006 16:51:05 -0000 Received: from motgate8.mot.com (HELO motgate8.mot.com) (129.188.136.8) by server-13.tower-119.messagelabs.com with SMTP; 6 Dec 2006 16:51:05 -0000 Received: from il06exr03.mot.com (il06exr03.mot.com [129.188.137.133]) by motgate8.mot.com (8.12.11/Motorola) with ESMTP id kB6Gp4po027087 for <rbridge@postel.org>; Wed, 6 Dec 2006 09:51:05 -0700 (MST) Received: from de01exm64.ds.mot.com (de01exm64.am.mot.com [10.176.8.15]) by il06exr03.mot.com (8.13.1/8.13.0) with ESMTP id kB6Gp4Y1005924 for <rbridge@postel.org>; Wed, 6 Dec 2006 10:51:04 -0600 (CST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 6 Dec 2006 11:51:03 -0500 Message-ID: <3870C46029D1F945B1472F170D2D979001C90B46@de01exm64.ds.mot.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501016E0E@uspitsmsgusr08.win.marconi.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Draft minutes posted Thread-Index: AccYs2HvB/q/c1jsTPWSoyK93DQgZwAowZxg From: "Eastlake III Donald-LDE008" <Donald.Eastlake@motorola.com> To: "Gray, Eric" <Eric.Gray@marconi.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: donald.eastlake@motorola.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6Gp8UT021454 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 16:51:24 -0000 Status: RO Content-Length: 1614 Sure, That would be the ideal thing, with messages having this subject only about the accuracy of the minutes is recording what generally happened at the meeting and technical subjects in other threads with different subject lines. But it is usually hard to get people to constrain themselves that way. Donald -----Original Message----- From: rbridge-bounces@postel.org [mailto:rbridge-bounces@postel.org] On Behalf Of Gray, Eric Sent: Tuesday, December 05, 2006 4:19 PM To: Erik Nordmark Cc: Developing a hybrid router/bridge. Subject: Re: [rbridge] Draft minutes posted Erik, Can I suggest that we should use a different thread - perhaps later (in a few days) - to address issues with the what was said during the meeting, that we might have disagreed with but did not have time to discuss? Meanwhile, we should use this thread only to talk about clarifying or correcting what was reportedly said during the meeting. Does that make sense? -- Eric > -----Original Message----- > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] On Behalf Of Erik Nordmark > Sent: Tuesday, December 05, 2006 12:59 PM > To: Developing a hybrid router/bridge. > Subject: [rbridge] Draft minutes posted > > > At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > > Any corrections? > > Erik > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > _______________________________________________ rbridge mailing list rbridge@postel.org http://mailman.postel.org/mailman/listinfo/rbridge Received: from zcars04f.nortel.com (zcars04f.nortel.com [47.129.242.57]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6GEt4Q009491 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Wed, 6 Dec 2006 08:14:56 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zcars04f.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id kB6GEfr23546; Wed, 6 Dec 2006 11:14:42 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 6 Dec 2006 11:14:39 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C435E0F@zrtphxm2.corp.nortel.com> In-Reply-To: <0BF76B30C100624BA997C9CED19D812501016EAD@uspitsmsgusr08.win.marconi.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Use of 802.1ah Encaps Thread-Index: AccZPMYd8D/bp9TwSwi9vsnIHqHTvwAEjT2Q From: "Don Fedyk" <dwfedyk@nortel.com> To: "Gray, Eric" <Eric.Gray@marconi.com>, "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB6GEt4Q009491 Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 16:15:14 -0000 Status: RO Content-Length: 3197 Hi Eric > -----Original Message----- > From: Gray, Eric [mailto:Eric.Gray@marconi.com] > > Ali/Don, > > The use of 802.1ah encapsulation does not intuitively > suggest itself in the TRILL problem domain for at least two > reasons: > > 1) Provider Back-bone Bridging intuitively seems out of > place in solutions aimed at enterprise networks - and > this would seem to be even more true for solutions > aimed at "plug-and-play" applicability. Hmmm Trill spent 1.5 years coming up with a header that looks remarkably like 802.1ah. A fact many of us have pointed out before. If you are using an IEEE 802.1 Ethernet data plane your baseline choices are 802.1Q or 802.1ah. > > 2) Use of 802.1ah encapsulation assumes "bridging" of the > tunneled frame transparently from edge-to-edge - and > this would seem to go counter to the idea of using a > link-state routing protocol for shortest path routing > of MAC frames. Encapsulation and the use of link state are orthogonal concepts so I disagree. > > That said, the minute that we start suggesting that an > enterprise is large enough to require using service provider > (like) solutions (in particular, requiring a substantial > back-bone capacity, and assuming static configuration as a > means to ensure deterministic network behavior) - OR that we > might in fact use some form of spanning tree forwarding - it > then becomes clear that we should consider using 802.1ah. It > is certainly the case that we should not be defining another > Ethernet encapsulation explicitly to solve the same problem. What we should be worried about is solutions for commoditized encapsulated header. Ethernet has benefited in the past by having a wide applicability: enterprise to carrier for chips and software that were produced. Regards, Don > > -- > Eric > > > -----Original Message----- > > From: rbridge-bounces@postel.org > > [mailto:rbridge-bounces@postel.org] On Behalf Of Ali > Sajassi (sajassi) > > Sent: Wednesday, December 06, 2006 2:39 AM > > To: Don Fedyk; Developing a hybrid router/bridge. > > Subject: Re: [rbridge] Draft minutes posted > > > > > > > > > > Yes, if there is any reason as to why .1ah encap cannot be > > used, then I > > would like to hear it. > > > > -Ali > > > > > > > > > -----Original Message----- > > > From: rbridge-bounces@postel.org > > > [mailto:rbridge-bounces@postel.org] On Behalf Of Don Fedyk > > > Sent: Tuesday, December 05, 2006 10:17 AM > > > To: Developing a hybrid router/bridge. > > > Subject: Re: [rbridge] Draft minutes posted > > > > > > Hi Erik > > > > > > In the minutes: > > > 802.1ah header synergy? On this point myself, and I recall > > > Ali Sajassi and Donald Oconnor all stood up and said that > > > 802.1ah is going to be a standard encapsulation header. My > > > point was Trill should see what it could deliver on this > > > encapsulation before inventing similar but different headers. > > > > > > Regards, > > > Don > > > > > > > -----Original Message----- > > > > From: rbridge-bounces@postel.org > > > > At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > > > > > > > > Any corrections? > > > > > > > > Erik Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB6DjGLu022086 for <rbridge@postel.org>; Wed, 6 Dec 2006 05:45:17 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB6Dj0SL005163; Wed, 6 Dec 2006 08:45:00 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id IAA17437; Wed, 6 Dec 2006 08:45:00 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0THLJ>; Wed, 6 Dec 2006 08:44:59 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501016EAD@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: "Ali Sajassi (sajassi)" <sajassi@cisco.com>, Don Fedyk <dwfedyk@nortel.com> Date: Wed, 6 Dec 2006 08:44:58 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Use of 802.1ah Encaps X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 13:45:29 -0000 Status: RO Content-Length: 2727 Ali/Don, The use of 802.1ah encapsulation does not intuitively suggest itself in the TRILL problem domain for at least two reasons: 1) Provider Back-bone Bridging intuitively seems out of place in solutions aimed at enterprise networks - and this would seem to be even more true for solutions aimed at "plug-and-play" applicability. 2) Use of 802.1ah encapsulation assumes "bridging" of the tunneled frame transparently from edge-to-edge - and this would seem to go counter to the idea of using a link-state routing protocol for shortest path routing of MAC frames. That said, the minute that we start suggesting that an enterprise is large enough to require using service provider (like) solutions (in particular, requiring a substantial back-bone capacity, and assuming static configuration as a means to ensure deterministic network behavior) - OR that we might in fact use some form of spanning tree forwarding - it then becomes clear that we should consider using 802.1ah. It is certainly the case that we should not be defining another Ethernet encapsulation explicitly to solve the same problem. -- Eric > -----Original Message----- > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] On Behalf Of Ali Sajassi (sajassi) > Sent: Wednesday, December 06, 2006 2:39 AM > To: Don Fedyk; Developing a hybrid router/bridge. > Subject: Re: [rbridge] Draft minutes posted > > > > > Yes, if there is any reason as to why .1ah encap cannot be > used, then I > would like to hear it. > > -Ali > > > > > -----Original Message----- > > From: rbridge-bounces@postel.org > > [mailto:rbridge-bounces@postel.org] On Behalf Of Don Fedyk > > Sent: Tuesday, December 05, 2006 10:17 AM > > To: Developing a hybrid router/bridge. > > Subject: Re: [rbridge] Draft minutes posted > > > > Hi Erik > > > > In the minutes: > > 802.1ah header synergy? On this point myself, and I recall > > Ali Sajassi and Donald Oconnor all stood up and said that > > 802.1ah is going to be a standard encapsulation header. My > > point was Trill should see what it could deliver on this > > encapsulation before inventing similar but different headers. > > > > Regards, > > Don > > > > > -----Original Message----- > > > From: rbridge-bounces@postel.org > > > At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > > > > > > Any corrections? > > > > > > Erik > > > > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from sj-iport-5.cisco.com (sj-iport-5.cisco.com [171.68.10.87]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB67d2Ck004504 for <rbridge@postel.org>; Tue, 5 Dec 2006 23:39:02 -0800 (PST) Received: from sj-dkim-6.cisco.com ([171.68.10.81]) by sj-iport-5.cisco.com with ESMTP; 05 Dec 2006 23:39:02 -0800 Received: from sj-core-4.cisco.com (sj-core-4.cisco.com [171.68.223.138]) by sj-dkim-6.cisco.com (8.12.11/8.12.11) with ESMTP id kB67d1Yg002680; Tue, 5 Dec 2006 23:39:01 -0800 Received: from xbh-sjc-221.amer.cisco.com (xbh-sjc-221.cisco.com [128.107.191.63]) by sj-core-4.cisco.com (8.12.10/8.12.6) with ESMTP id kB67d1OV012709; Tue, 5 Dec 2006 23:39:01 -0800 (PST) Received: from xmb-sjc-21e.amer.cisco.com ([171.70.151.156]) by xbh-sjc-221.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Tue, 5 Dec 2006 23:39:01 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Tue, 5 Dec 2006 23:39:00 -0800 Message-ID: <75B2A84D9323BC4CA3977CF378CE75EB027827B3@xmb-sjc-21e.amer.cisco.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Draft minutes posted Thread-Index: AccYl6uafh6PSvYJSYCcHLZ/N6nywQAAbgPgABvxdcA= From: "Ali Sajassi \(sajassi\)" <sajassi@cisco.com> To: "Don Fedyk" <dwfedyk@nortel.com>, "Developing a hybrid router/bridge." <rbridge@postel.org> X-OriginalArrivalTime: 06 Dec 2006 07:39:01.0563 (UTC) FILETIME=[98FF80B0:01C71909] DKIM-Signature: v=0.5; a=rsa-sha256; q=dns/txt; l=1149; t=1165390741; x=1166254741; c=relaxed/simple; s=sjdkim6002; h=Content-Type:From:Subject:Content-Transfer-Encoding:MIME-Version; d=cisco.com; i=sajassi@cisco.com; z=From:=20=22Ali=20Sajassi=20\(sajassi\)=22=20<sajassi@cisco.com> |Subject:=20RE=3A=20[rbridge]=20Draft=20minutes=20posted |Sender:=20; bh=aDBftLnCxYrJESuUqhM5clpvBQzJg7uJ7pLGucJjCx8=; b=OzhDiyDZ0fvSStG5YQir8Nb5yNjxMbcYLBLxPcQR+eHMyiTQ890ayLkjL4eMUSlfVYjm07XK 4/0rzZDti1EoOPFnQqJ0BLkwuz2QZW1d67JlqJRWEX3Rtqg19ynWOgA7; Authentication-Results: sj-dkim-6; header.From=sajassi@cisco.com; dkim=pass ( sig from cisco.com/sjdkim6002 verified; ); X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: sajassi@cisco.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB67d2Ck004504 Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Wed, 06 Dec 2006 07:39:16 -0000 Status: RO Content-Length: 1071 Yes, if there is any reason as to why .1ah encap cannot be used, then I would like to hear it. -Ali > -----Original Message----- > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] On Behalf Of Don Fedyk > Sent: Tuesday, December 05, 2006 10:17 AM > To: Developing a hybrid router/bridge. > Subject: Re: [rbridge] Draft minutes posted > > Hi Erik > > In the minutes: > 802.1ah header synergy? On this point myself, and I recall > Ali Sajassi and Donald Oconnor all stood up and said that > 802.1ah is going to be a standard encapsulation header. My > point was Trill should see what it could deliver on this > encapsulation before inventing similar but different headers. > > Regards, > Don > > > -----Original Message----- > > From: rbridge-bounces@postel.org > > At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > > > > Any corrections? > > > > Erik > > > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB5LIeXM006082 for <rbridge@postel.org>; Tue, 5 Dec 2006 13:18:41 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB5LIdSL026762; Tue, 5 Dec 2006 16:18:39 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id QAA19423; Tue, 5 Dec 2006 16:18:38 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0TAM9>; Tue, 5 Dec 2006 16:18:38 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D812501016E0E@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Erik Nordmark <erik.nordmark@sun.com> Date: Tue, 5 Dec 2006 16:18:32 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: "Developing a hybrid router/bridge." <rbridge@postel.org> Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 05 Dec 2006 21:18:57 -0000 Status: RO Content-Length: 901 Erik, Can I suggest that we should use a different thread - perhaps later (in a few days) - to address issues with the what was said during the meeting, that we might have disagreed with but did not have time to discuss? Meanwhile, we should use this thread only to talk about clarifying or correcting what was reportedly said during the meeting. Does that make sense? -- Eric > -----Original Message----- > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] On Behalf Of Erik Nordmark > Sent: Tuesday, December 05, 2006 12:59 PM > To: Developing a hybrid router/bridge. > Subject: [rbridge] Draft minutes posted > > > At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > > Any corrections? > > Erik > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from mail128.messagelabs.com (mail128.messagelabs.com [216.82.250.131]) by boreas.isi.edu (8.13.8/8.13.8) with SMTP id kB5KHa9k017721 for <rbridge@postel.org>; Tue, 5 Dec 2006 12:17:40 -0800 (PST) X-VirusChecked: Checked X-Env-Sender: Donald.Eastlake@motorola.com X-Msg-Ref: server-8.tower-128.messagelabs.com!1165349854!2157127!1 X-StarScan-Version: 5.5.10.7; banners=-,-,- X-Originating-IP: [129.188.136.8] Received: (qmail 13741 invoked from network); 5 Dec 2006 20:17:34 -0000 Received: from motgate8.mot.com (HELO motgate8.mot.com) (129.188.136.8) by server-8.tower-128.messagelabs.com with SMTP; 5 Dec 2006 20:17:34 -0000 Received: from il06exr03.mot.com (il06exr03.mot.com [129.188.137.133]) by motgate8.mot.com (8.12.11/Motorola) with ESMTP id kB5KHTRx001331 for <rbridge@postel.org>; Tue, 5 Dec 2006 13:17:33 -0700 (MST) Received: from de01exm64.ds.mot.com (de01exm64.am.mot.com [10.176.8.15]) by il06exr03.mot.com (8.13.1/8.13.0) with ESMTP id kB5KHTik001255 for <rbridge@postel.org>; Tue, 5 Dec 2006 14:17:29 -0600 (CST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Tue, 5 Dec 2006 15:17:28 -0500 Message-ID: <3870C46029D1F945B1472F170D2D979001C4956C@de01exm64.ds.mot.com> In-Reply-To: <6ba8be229d3.456ded1e@sunlabs.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Extensions Thread-Index: AccUN9WJl/doTlMnQtSQ6T6hNmrWgADKIVAg From: "Eastlake III Donald-LDE008" <Donald.Eastlake@motorola.com> To: <Radia.Perlman@sun.com>, <rbridge@postel.org> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: donald.eastlake@motorola.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB5KHa9k017721 Subject: Re: [rbridge] Extensions X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 05 Dec 2006 20:18:00 -0000 Status: RO Content-Length: 5542 Hi, See comments below at @@@ -----Original Message----- From: Radia.Perlman@sun.com [mailto:Radia.Perlman@sun.com] Sent: Wednesday, November 29, 2006 11:27 PM To: Eastlake III Donald-LDE008 Cc: rbridge@postel.org Subject: Re: [rbridge] Extensions Clearly making the ability to add fields in the future in a compatible way gives flexibility. Having TLV encoding in IS-IS has proven to be really valuable. On the other hand, questions that should be asked are: a) why not? As in, what is the cost of doing this future flexibility? b) what kinds of features might we imagine c) is there any other way of adding features in the future in a compatible way? I'll make a stab at some of these a) Why not? Perhaps complexity of forwarding decision, or perceived complexity of the protocol that might discourage adoption. If all the fields necessary for current functionality are in the fixed portion of the shim, and RBridges that don't do the feature can ignore it, then that would not be a problem. But for instance, if they have to look at the inner header to find the VLAN tag (in order to know whether to filter a multicast), or the inner destination address (for IP derived multicast -- though maybe it's the layer 3 destination address that matters...not sure), then having a variable length shim header could be a cost @@@ There is no getting around the fact that providing extensions makes things more complex. And since extensions can be present or absence, it necessarily leads to a variable length shim in cases where extensions might be present. However, the extension proposal in my presentation, which does incorporate some ideas I got from others, tries to minimize the additional complexity. In particular, it tries to assure that any Rbridge that might be an egress Rbridge will not receive any extension that it does not understand. A goal of the extension design is that an Rbridge the does not understand any extensions would not need any additional code. @@@ If there are fields after the shim in the current design that are clearly needed for normal operation, such as inner VLAN tag for broadcast/multicast filtering, then it seems like it might be a good idea to mirror them in the shim. @@@ But, beyond normal Rbridge operation, there is no obvious limit on how deeply some QoS policy might want to look into a packet. It could certainly want to look at TCP port, for example, which already requires it, in the Rbridge case, to skip over a variable length assortment of 802.1 inserts between the inner MAC addresses and the inner payload. If a feature outside of TRILL already has to do something that complex, it doesn't seem like much of a burden for it to understand a variable length shim due to extensions. Thus, the proposal in my presentation provides an overall extensions size to make it relatively easy to skip them. b) features: LIDs ... any others? @@@ LIDs seem like a nice extension that has the characteristic that you only would want to include it if both end point Rbridges understood it (see comments under "c)" below). @@@ Someone might want a security extension. Even if it turned out to use 802.1AE, it seem like you would need a way to indicate that such information was present in the Rbridge shim. @@@ Of course, the most interesting extensions would be those that are not currently thought of. c) not sure @@@ Adding feature can be done in different ways. I think they may all be logically equivalent but they would have very different implementation impact. For example, instead of extensions, you could have a version number so that when you define extension N, if you use that extension, you have to assert version N. This seems like a bad idea because you have to upgrade all your equipment to know about version N. Possibly that makes sense for an extension that every Rbridge actually has to understand, but maybe such a radical extension is best considered to be a revision of the base protocol. More reasonable extension proposals would provide more or less end-to-end Rbridge extensions in such a way that intervening Rbridges could ignore them. Radia @@@ Thanks, @@@ Donald ----- Original Message ----- From: Eastlake III Donald-LDE008 <Donald.Eastlake@motorola.com> Date: Wednesday, November 29, 2006 7:58 pm Subject: [rbridge] Extensions > Hi, > > It is not so much that I think that TRILL needs any particular > extension added right now, it is just that if there is ever a reason to > add an extension, it would be good for the extension framework to have > been decided in advance. The presentation that I didn't have time to > make at the TRILL WG meeting in San Diego has now been converted from > MS Power Point and is on the Working Group agendas and presentations > web page for the 67th IETF meeting in HTML and is also available at > http://www.pothole.com/~dee3 in PDF. > > Donald > > -----Original Message----- > From: rbridge-bounces@postel.org [rbridge-bounces@postel.org] On > Behalf Of Radia Perlman > Sent: Monday, November 13, 2006 8:01 PM > Cc: rbridge@postel.org > Subject: Re: [rbridge] Should we optimize the common case? > > ...... > > Another thing we haven't talked about on the list (and ran out of time > at the meeting), is Don Eastlake's suggestion of allowing the shim > header to be variable length, so that we can optionally put in thing > like LIDs. > > Radia > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from zrtps0kp.nortel.com (zrtps0kp.nortel.com [47.140.192.56]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB5IH1KH006331 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for <rbridge@postel.org>; Tue, 5 Dec 2006 10:17:02 -0800 (PST) Received: from zrtphxm2.corp.nortel.com (zrtphxm2.corp.nortel.com [47.140.202.51]) by zrtps0kp.nortel.com (Switch-2.2.6/Switch-2.2.0) with ESMTP id kB5IGx718756 for <rbridge@postel.org>; Tue, 5 Dec 2006 13:16:59 -0500 (EST) X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Tue, 5 Dec 2006 13:16:56 -0500 Message-ID: <34B3EAA5B3066A42914D28C5ECF5FEA40C3ED845@zrtphxm2.corp.nortel.com> In-Reply-To: <4575B36C.8050500@sun.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [rbridge] Draft minutes posted Thread-Index: AccYl6uafh6PSvYJSYCcHLZ/N6nywQAAbgPg From: "Don Fedyk" <dwfedyk@nortel.com> To: "Developing a hybrid router/bridge." <rbridge@postel.org> X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: dwfedyk@nortel.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB5IH1KH006331 Subject: Re: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 05 Dec 2006 18:17:20 -0000 Status: RO Content-Length: 506 Hi Erik In the minutes: 802.1ah header synergy? On this point myself, and I recall Ali Sajassi and Donald Oconnor all stood up and said that 802.1ah is going to be a standard encapsulation header. My point was Trill should see what it could deliver on this encapsulation before inventing similar but different headers. Regards, Don > -----Original Message----- > From: rbridge-bounces@postel.org > At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt > > Any corrections? > > Erik > Received: from brmea-mail-2.sun.com (brmea-mail-2.Sun.COM [192.18.98.43]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB5Hx9VT000285 for <rbridge@postel.org>; Tue, 5 Dec 2006 09:59:09 -0800 (PST) Received: from jurassic.eng.sun.com ([129.146.104.31]) by brmea-mail-2.sun.com (8.13.6+Sun/8.12.9) with ESMTP id kB5Hx9jD011977 for <rbridge@postel.org>; Tue, 5 Dec 2006 10:59:09 -0700 (MST) Received: from [192.9.61.11] (punchin-nordmark.SFBay.Sun.COM [192.9.61.11]) by jurassic.eng.sun.com (8.13.8+Sun/8.13.8) with ESMTP id kB5Hx8co237717 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 5 Dec 2006 09:59:08 -0800 (PST) Message-ID: <4575B36C.8050500@sun.com> Date: Tue, 05 Dec 2006 09:59:08 -0800 From: Erik Nordmark <erik.nordmark@sun.com> User-Agent: Thunderbird 1.5.0.5 (X11/20060911) MIME-Version: 1.0 To: "Developing a hybrid router/bridge." <rbridge@postel.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: erik.nordmark@sun.com Subject: [rbridge] Draft minutes posted X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Tue, 05 Dec 2006 17:59:30 -0000 Status: RO Content-Length: 90 At http://www3.ietf.org/proceedings/06nov/minutes/trill.txt Any corrections? Erik Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB1NZCRE016655 for <rbridge@postel.org>; Fri, 1 Dec 2006 15:35:13 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB1NZ8SL010258; Fri, 1 Dec 2006 18:35:08 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id SAA21160; Fri, 1 Dec 2006 18:35:08 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0R643>; Fri, 1 Dec 2006 18:35:07 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D8125F2BC73@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: =?iso-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es>, Radia.Perlman@sun.com Date: Fri, 1 Dec 2006 18:35:04 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain; charset="iso-8859-1" X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by boreas.isi.edu id kB1NZCRE016655 Cc: rbridge@postel.org Subject: Re: [rbridge] VLAN tags, inner/outer, revisted and summarized X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 01 Dec 2006 23:35:49 -0000 Status: RO Content-Length: 9221 Guillermo, I think I'm missing some context here. I want to understand what you mean by "concatenation of two 802.1Q VLAN tags (to yield a 24-bit VLAN identifier)" - are you speaking of explicit concatenation (in the sense that both 802.1Q VLAN tags are used simultaneously in making a forwarding decision), or are you talking about a general sense of layered 802.1Q (in which only one VLAN tag is used - at a time in the making of a single forwarding decision)? -- Eric > -----Original Message----- > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] On Behalf Of Guillermo Ib??ez > Sent: Friday, December 01, 2006 5:44 PM > To: Radia.Perlman@sun.com > Cc: rbridge@postel.org > Subject: Re: [rbridge] VLAN tags, inner/outer, revisted and summarized > > > I wonder whether the IEEE position against extending VLANs to 24 bit > applies in the RBridges context. See the mail below from the > liaison to > IETF. > Guillermo > > Extracted text: "The possible concatenation of two 802.1Q > VLAN tags (to > yield a 24-bit VLAN identifier) has > been discussed, is of considerable concern, and is believed to be not > just a violation of the > 802.1Q standard but also of the architectural principles on > which 802.1 > standardization is > based". > > > From: "Romascanu, Dan (Dan)" <dromasca@avaya.com > <mailto:dromasca@avaya.com>> > To: "IESG" <iesg@ietf.org <mailto:iesg@ietf.org>>; <iab@ietf.org > <mailto:iab@ietf.org>> > Cc: < l2vpn@ietf.org <mailto:l2vpn@ietf.org>>; > <ccamp-chairs@tools.ietf.org <mailto:ccamp-chairs@tools.ietf.org>>; > "Tony Jeffree" > <tony@jeffree.co.uk <mailto:tony@jeffree.co.uk>> > Sent: Wednesday, September 06, 2006 2:55 PM > Subject: IEEE 802.1 WG liaison letter to the IETF > The IEEE 802.1 Working Group approved the following liaison letter to > the IETF, containing clarifications in response to several queries > related to the use of IEEE 802.1Q VLAN tags. > > http://www.ieee802.org/1/files/public/docs2006/liaison-contrib > -to-ietf-m > ef-dsl-forum-0706.pdf > <http://www.ieee802.org/1/files/public/docs2006/liaison-contri > b-to-ietf-mef-dsl-forum-0706.pdf> > > Please distribute this letter to the interested Working > Groups that are > not included in the distribution list. > > Dan > (wearing the hat of IEEE 802.1 WG liaison to the IETF) > > > __________________________________________________ > > Radia.Perlman@sun.com escribi?: > > Silvano explained a reason for an "outer" vs an "inner" > VLAN tag, which is really to accomplish making > > a 24-bit VLAN tag, hierarchically assigned by 12 bits for > customer, and 12 bits for use by that customer. > > > > The only changes we'd need to the base spec is as follows: > > > > a) the VLAN tag specified in the per-VLAN IS-IS instance > would be 24 bits instead of 12 (the per-VLAN instance > > is the thing where R1 says what endnodes are attached, and > whether R1 has an IP multicast router > > attached, and what IP multicast groups have members attached). > > > > b) For unicast traffic: the ingress RBridge R1 looks up the > egress RBridge R2 based on > > the 24-bit VLAN tag, (using the 12 bits in the frame > indicating the customer-defined VLAN, plus 12 bits R1 infers > > based on which port R1 received the frame from) > > R1 puts the "which customer" portion of the VLAN tag in > the outer header. The reason for this is > > in case R2 has ports to two different customers, and there > are overlapping endnode address spaces, R2 will > > need the outer VLAN tag to determine which port to > decapsulate the frame onto. > > > > c) for unknown destination/multicast: the ingress RBridge > R1 puts the "which customer" portion of the VLAn > > tag into an outer VLAN tag, and RBridges in the core filter > based on the 24-bit VLAN by using both the inner > > and outer 12 bits. > > > > This proposal still treats the infrastructure (all the > transit links) as shared by all VLANs, which I like the > > robustness and simplicity of. > > > > Radia > > > > > > > > ----- Original Message ----- > > From: Radia Perlman <Radia.Perlman@sun.com> > > Date: Thursday, November 30, 2006 7:36 pm > > Subject: [rbridge] VLAN tags, inner/outer, revisted and summarized > > > > > >> There's been a lot of discussion, and I believe this is what is > >> going > >> on: In this email I will attempt to just > >> explain, and not advocate. If I want to express opinions, I'll > >> reply to > >> this. > >> > >> The first question we have to ask is what things people are doing > >> with > >> VLANs. The next is to ask > >> which subset of these (possibly "all") we want to support with > >> TRILL, > >> and to answer that we have > >> to also answer what the cost/benefit of solving each with TRILL is. > >> > >> Things VLANs can provide: > >> a) separate endnodes into communities, to enforce that only VLAN A > >> nodes > >> can talk to VLAN A nodes > >> b) scoping things like ARP, so an ARP for a VLAN A node only gets > >> sent > >> on VLAN A links > >> c) security -- making sure that VLAN A nodes cannot snoop > on VLAN B > >> trafficd) provisioning -- making sure that the only traffic on a > >> VLAN A link is > >> VLAN A traffic, or > >> perhaps BGP-policy-like, as in, "this link is willing to carry > >> VLANs A, > >> B, and Q, but not D". > >> > >> Perhaps this is not an exhaustive list, but I hope it's > close enough. > >> > >> What are the costs of providing these things? > >> > >> The solution that I'd been assuming solves a) and b). That > solution > >> is > >> summarized as follows: > >> If RBridges R1 and R2 are on the same link, they are > neighbors, and > >> they > >> can send transit traffic to each other, > >> regardless of the VLAN on which it originated. This can be thought > >> of as > >> RBridges create a cloud, > >> which keeps VLAN traffic segregated at the endpoints, but is a > >> single > >> shared infrastructure for all > >> VLANs within the cloud. > >> > >> That solution does not solve c) and d), though if the > transit links > >> are > >> all point-to-point links > >> between RBridges, this is moot. The case that isn't solved is when > >> a > >> link is both a transit link > >> and a shared link with a bunch of endnodes in a VLAN. > >> > >> Suppose we want to solve those? > >> > >> What I think people would be asking for is to have the VLAN > >> determine > >> not just the destination, but what > >> path the packet takes. So some links would only allow certain VLAN > >> traffic on them, even for transit. > >> Which would mean multiple forwarding tables, since paths > would have > >> to > >> be VLAN-dependent. > >> > >> So, I think the basic strategies are: > >> > >> a) create as much connectivity as possible between RBridge > >> neighbors. If > >> R1, R2, and R3 are on the same > >> shared/bridged link, and R1 can only talk to R2 if it puts > "VLAN X" > >> into > >> the header, and R1 can only > >> talk to R3 if it puts "VLAN Y" into the header, R1 discovers this > >> case > >> by being configured that the > >> link needs either VLAN X or VLAN Y tags, sends IS-IS Hellos with > >> both, > >> and wdiscovers that on the > >> adjacency to R2, R1 has to stick "VLAN X" and to R3, R1 has to > >> stick > >> "VLAN Y". So R1 does whatever > >> is necessary to talk to its neighbors, but it is only relevant on > >> the > >> hop. R1 reports in its link state packet that > >> it has a neighbor R2, and R3. All RBridges can use the link for > >> transit > >> for all VLANs. > >> > >> b) only allow R1 and R2 to be IS-IS neighbors if they can talk to > >> each > >> other with a null VLAN tag. A link > >> that requires a VLAN tag can only be used as an ingress or egress > >> link > >> from the cloud. > >> > >> c) copy the VLAN tag to the outer header, assume any link that > >> requires > >> a particular VLAN tag wants to exclude > >> transit traffic for all other VLANs, or even for null tags, on the > >> link > >> Run separate core instances of IS-IS for > >> each VLAN tag. Perhaps announcing in the VLAN A instance, all VLAN > >> A > >> links, plus links that allow > >> for null tags. > >> > >> d) like with c), but allow a link to be configured as "there are > >> VLAN A > >> endnodes here, but transit traffic for any VLAN > >> is fine". > >> > >> Solutions c) and d) require separate forwarding tables per VLAN, > >> and > >> either separate instances of IS-IS, or > >> a link attribute that lists legal VLAN tags for the link. VLAN A > >> segments might become disconnected > >> because although there is RBridge connectivity, it isn't through > >> links > >> that say it's OK to have VLAN A traffic. > >> > >> Radia > >> > >> > >> _______________________________________________ > >> rbridge mailing list > >> rbridge@postel.org > >> http://mailman.postel.org/mailman/listinfo/rbridge > >> > >> > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from mailgate.pit.comms.marconi.com (mailgate.pit.comms.marconi.com [169.144.68.6]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB1NQ15Z013183 for <rbridge@postel.org>; Fri, 1 Dec 2006 15:26:02 -0800 (PST) Received: from mailman.pit.comms.marconi.com (mailman.pit.comms.marconi.com [169.144.2.12]) by mailgate.pit.comms.marconi.com (8.12.10+Sun/8.12.10) with ESMTP id kB1NQ1SL010151; Fri, 1 Dec 2006 18:26:01 -0500 (EST) Received: from uspitsmsgrtr01.pit.comms.marconi.com (uspitsmsgrtr01.pit.comms.marconi.com [169.144.2.221]) by mailman.pit.comms.marconi.com (8.9.3/8.9.3) with ESMTP id SAA20856; Fri, 1 Dec 2006 18:26:01 -0500 (EST) Received: by uspitsmsgrtr01.pit.comms.marconi.com with Internet Mail Service (5.5.2657.72) id <XFT0R6R6>; Fri, 1 Dec 2006 18:26:00 -0500 Message-ID: <0BF76B30C100624BA997C9CED19D8125F2BC71@uspitsmsgusr08.win.marconi.com> From: "Gray, Eric" <Eric.Gray@marconi.com> To: Radia.Perlman@sun.com Date: Fri, 1 Dec 2006 18:25:58 -0500 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: eric.gray@marconi.com Cc: rbridge@postel.org Subject: Re: [rbridge] VLAN tags, inner/outer, revisted and summarized X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 01 Dec 2006 23:26:19 -0000 Status: RO Content-Length: 7379 I have no fundamental objections to making this change. However, it may be important to realize that the supposed purpose for this change implies a "service provisioning" model for RBridge/TRILL deployment as opposed to a strictly enterprise model. Even in the case where we're speaking of an enterprise so large that the enterprise's IT functions effectively as a service provider, we potentially open the door to the _general_ service provisioning problem space. I hope this is not the fore-runner to a number of simple changes that might lead us to proposing a solution to a set of problems the IETF is already addressing elsewhere... -- Eric > -----Original Message----- > From: rbridge-bounces@postel.org > [mailto:rbridge-bounces@postel.org] On Behalf Of Radia.Perlman@sun.com > Sent: Friday, December 01, 2006 2:59 PM > To: Radia Perlman > Cc: rbridge@postel.org > Subject: Re: [rbridge] VLAN tags, inner/outer, revisted and summarized > > Silvano explained a reason for an "outer" vs an "inner" VLAN > tag, which is really to accomplish making > a 24-bit VLAN tag, hierarchically assigned by 12 bits for > customer, and 12 bits for use by that customer. > > The only changes we'd need to the base spec is as follows: > > a) the VLAN tag specified in the per-VLAN IS-IS instance > would be 24 bits instead of 12 (the per-VLAN instance > is the thing where R1 says what endnodes are attached, and > whether R1 has an IP multicast router > attached, and what IP multicast groups have members attached). > > b) For unicast traffic: the ingress RBridge R1 looks up the > egress RBridge R2 based on > the 24-bit VLAN tag, (using the 12 bits in the frame > indicating the customer-defined VLAN, plus 12 bits R1 infers > based on which port R1 received the frame from) > R1 puts the "which customer" portion of the VLAN tag in the > outer header. The reason for this is > in case R2 has ports to two different customers, and there > are overlapping endnode address spaces, R2 will > need the outer VLAN tag to determine which port to > decapsulate the frame onto. > > c) for unknown destination/multicast: the ingress RBridge R1 > puts the "which customer" portion of the VLAn > tag into an outer VLAN tag, and RBridges in the core filter > based on the 24-bit VLAN by using both the inner > and outer 12 bits. > > This proposal still treats the infrastructure (all the > transit links) as shared by all VLANs, which I like the > robustness and simplicity of. > > Radia > > > > ----- Original Message ----- > From: Radia Perlman <Radia.Perlman@sun.com> > Date: Thursday, November 30, 2006 7:36 pm > Subject: [rbridge] VLAN tags, inner/outer, revisted and summarized > > > There's been a lot of discussion, and I believe this is what is > > going > > on: In this email I will attempt to just > > explain, and not advocate. If I want to express opinions, I'll > > reply to > > this. > > > > The first question we have to ask is what things people are doing > > with > > VLANs. The next is to ask > > which subset of these (possibly "all") we want to support with > > TRILL, > > and to answer that we have > > to also answer what the cost/benefit of solving each with TRILL is. > > > > Things VLANs can provide: > > a) separate endnodes into communities, to enforce that only VLAN A > > nodes > > can talk to VLAN A nodes > > b) scoping things like ARP, so an ARP for a VLAN A node only gets > > sent > > on VLAN A links > > c) security -- making sure that VLAN A nodes cannot snoop on VLAN B > > trafficd) provisioning -- making sure that the only traffic on a > > VLAN A link is > > VLAN A traffic, or > > perhaps BGP-policy-like, as in, "this link is willing to carry > > VLANs A, > > B, and Q, but not D". > > > > Perhaps this is not an exhaustive list, but I hope it's > close enough. > > > > What are the costs of providing these things? > > > > The solution that I'd been assuming solves a) and b). That solution > > is > > summarized as follows: > > If RBridges R1 and R2 are on the same link, they are neighbors, and > > they > > can send transit traffic to each other, > > regardless of the VLAN on which it originated. This can be thought > > of as > > RBridges create a cloud, > > which keeps VLAN traffic segregated at the endpoints, but is a > > single > > shared infrastructure for all > > VLANs within the cloud. > > > > That solution does not solve c) and d), though if the transit links > > are > > all point-to-point links > > between RBridges, this is moot. The case that isn't solved is when > > a > > link is both a transit link > > and a shared link with a bunch of endnodes in a VLAN. > > > > Suppose we want to solve those? > > > > What I think people would be asking for is to have the VLAN > > determine > > not just the destination, but what > > path the packet takes. So some links would only allow certain VLAN > > traffic on them, even for transit. > > Which would mean multiple forwarding tables, since paths would have > > to > > be VLAN-dependent. > > > > So, I think the basic strategies are: > > > > a) create as much connectivity as possible between RBridge > > neighbors. If > > R1, R2, and R3 are on the same > > shared/bridged link, and R1 can only talk to R2 if it puts "VLAN X" > > into > > the header, and R1 can only > > talk to R3 if it puts "VLAN Y" into the header, R1 discovers this > > case > > by being configured that the > > link needs either VLAN X or VLAN Y tags, sends IS-IS Hellos with > > both, > > and wdiscovers that on the > > adjacency to R2, R1 has to stick "VLAN X" and to R3, R1 has to > > stick > > "VLAN Y". So R1 does whatever > > is necessary to talk to its neighbors, but it is only relevant on > > the > > hop. R1 reports in its link state packet that > > it has a neighbor R2, and R3. All RBridges can use the link for > > transit > > for all VLANs. > > > > b) only allow R1 and R2 to be IS-IS neighbors if they can talk to > > each > > other with a null VLAN tag. A link > > that requires a VLAN tag can only be used as an ingress or egress > > link > > from the cloud. > > > > c) copy the VLAN tag to the outer header, assume any link that > > requires > > a particular VLAN tag wants to exclude > > transit traffic for all other VLANs, or even for null tags, on the > > link > > Run separate core instances of IS-IS for > > each VLAN tag. Perhaps announcing in the VLAN A instance, all VLAN > > A > > links, plus links that allow > > for null tags. > > > > d) like with c), but allow a link to be configured as "there are > > VLAN A > > endnodes here, but transit traffic for any VLAN > > is fine". > > > > Solutions c) and d) require separate forwarding tables per VLAN, > > and > > either separate instances of IS-IS, or > > a link attribute that lists legal VLAN tags for the link. VLAN A > > segments might become disconnected > > because although there is RBridge connectivity, it isn't through > > links > > that say it's OK to have VLAN A traffic. > > > > Radia > > > > > > _______________________________________________ > > rbridge mailing list > > rbridge@postel.org > > http://mailman.postel.org/mailman/listinfo/rbridge > > > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from smtp01.uc3m.es (smtp01.uc3m.es [163.117.136.121]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB1MiFVa001565 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for <rbridge@postel.org>; Fri, 1 Dec 2006 14:44:17 -0800 (PST) Received: from smtp01.uc3m.es (localhost [127.0.0.1]) by localhost.uc3m.es (Postfix) with ESMTP id CBAEF110D93; Fri, 1 Dec 2006 23:44:14 +0100 (CET) Received: from [10.0.0.4] (39.Red-80-37-137.staticIP.rima-tde.net [80.37.137.39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp01.uc3m.es (Postfix) with ESMTP id 06401110F0C; Fri, 1 Dec 2006 23:44:13 +0100 (CET) Message-ID: <4570B03E.4080003@it.uc3m.es> Date: Fri, 01 Dec 2006 23:44:14 +0100 From: =?ISO-8859-1?Q?Guillermo_Ib=E1=F1ez?= <gibanez@it.uc3m.es> User-Agent: Thunderbird 1.5.0.8 (Windows/20061025) MIME-Version: 1.0 To: Radia.Perlman@sun.com References: <71a9647c60f2.457018f2@sunlabs.com> In-Reply-To: <71a9647c60f2.457018f2@sunlabs.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: gibanez@it.uc3m.es Cc: rbridge@postel.org Subject: Re: [rbridge] VLAN tags, inner/outer, revisted and summarized X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 01 Dec 2006 22:44:40 -0000 Status: RO Content-Length: 7784 I wonder whether the IEEE position against extending VLANs to 24 bit applies in the RBridges context. See the mail below from the liaison to IETF. Guillermo Extracted text: "The possible concatenation of two 802.1Q VLAN tags (to yield a 24-bit VLAN identifier) has been discussed, is of considerable concern, and is believed to be not just a violation of the 802.1Q standard but also of the architectural principles on which 802.1 standardization is based". From: "Romascanu, Dan (Dan)" <dromasca@avaya.com <mailto:dromasca@avaya.com>> To: "IESG" <iesg@ietf.org <mailto:iesg@ietf.org>>; <iab@ietf.org <mailto:iab@ietf.org>> Cc: < l2vpn@ietf.org <mailto:l2vpn@ietf.org>>; <ccamp-chairs@tools.ietf.org <mailto:ccamp-chairs@tools.ietf.org>>; "Tony Jeffree" <tony@jeffree.co.uk <mailto:tony@jeffree.co.uk>> Sent: Wednesday, September 06, 2006 2:55 PM Subject: IEEE 802.1 WG liaison letter to the IETF The IEEE 802.1 Working Group approved the following liaison letter to the IETF, containing clarifications in response to several queries related to the use of IEEE 802.1Q VLAN tags. http://www.ieee802.org/1/files/public/docs2006/liaison-contrib-to-ietf-m ef-dsl-forum-0706.pdf <http://www.ieee802.org/1/files/public/docs2006/liaison-contrib-to-ietf-mef-dsl-forum-0706.pdf> Please distribute this letter to the interested Working Groups that are not included in the distribution list. Dan (wearing the hat of IEEE 802.1 WG liaison to the IETF) __________________________________________________ Radia.Perlman@sun.com escribi?: > Silvano explained a reason for an "outer" vs an "inner" VLAN tag, which is really to accomplish making > a 24-bit VLAN tag, hierarchically assigned by 12 bits for customer, and 12 bits for use by that customer. > > The only changes we'd need to the base spec is as follows: > > a) the VLAN tag specified in the per-VLAN IS-IS instance would be 24 bits instead of 12 (the per-VLAN instance > is the thing where R1 says what endnodes are attached, and whether R1 has an IP multicast router > attached, and what IP multicast groups have members attached). > > b) For unicast traffic: the ingress RBridge R1 looks up the egress RBridge R2 based on > the 24-bit VLAN tag, (using the 12 bits in the frame indicating the customer-defined VLAN, plus 12 bits R1 infers > based on which port R1 received the frame from) > R1 puts the "which customer" portion of the VLAN tag in the outer header. The reason for this is > in case R2 has ports to two different customers, and there are overlapping endnode address spaces, R2 will > need the outer VLAN tag to determine which port to decapsulate the frame onto. > > c) for unknown destination/multicast: the ingress RBridge R1 puts the "which customer" portion of the VLAn > tag into an outer VLAN tag, and RBridges in the core filter based on the 24-bit VLAN by using both the inner > and outer 12 bits. > > This proposal still treats the infrastructure (all the transit links) as shared by all VLANs, which I like the > robustness and simplicity of. > > Radia > > > > ----- Original Message ----- > From: Radia Perlman <Radia.Perlman@sun.com> > Date: Thursday, November 30, 2006 7:36 pm > Subject: [rbridge] VLAN tags, inner/outer, revisted and summarized > > >> There's been a lot of discussion, and I believe this is what is >> going >> on: In this email I will attempt to just >> explain, and not advocate. If I want to express opinions, I'll >> reply to >> this. >> >> The first question we have to ask is what things people are doing >> with >> VLANs. The next is to ask >> which subset of these (possibly "all") we want to support with >> TRILL, >> and to answer that we have >> to also answer what the cost/benefit of solving each with TRILL is. >> >> Things VLANs can provide: >> a) separate endnodes into communities, to enforce that only VLAN A >> nodes >> can talk to VLAN A nodes >> b) scoping things like ARP, so an ARP for a VLAN A node only gets >> sent >> on VLAN A links >> c) security -- making sure that VLAN A nodes cannot snoop on VLAN B >> trafficd) provisioning -- making sure that the only traffic on a >> VLAN A link is >> VLAN A traffic, or >> perhaps BGP-policy-like, as in, "this link is willing to carry >> VLANs A, >> B, and Q, but not D". >> >> Perhaps this is not an exhaustive list, but I hope it's close enough. >> >> What are the costs of providing these things? >> >> The solution that I'd been assuming solves a) and b). That solution >> is >> summarized as follows: >> If RBridges R1 and R2 are on the same link, they are neighbors, and >> they >> can send transit traffic to each other, >> regardless of the VLAN on which it originated. This can be thought >> of as >> RBridges create a cloud, >> which keeps VLAN traffic segregated at the endpoints, but is a >> single >> shared infrastructure for all >> VLANs within the cloud. >> >> That solution does not solve c) and d), though if the transit links >> are >> all point-to-point links >> between RBridges, this is moot. The case that isn't solved is when >> a >> link is both a transit link >> and a shared link with a bunch of endnodes in a VLAN. >> >> Suppose we want to solve those? >> >> What I think people would be asking for is to have the VLAN >> determine >> not just the destination, but what >> path the packet takes. So some links would only allow certain VLAN >> traffic on them, even for transit. >> Which would mean multiple forwarding tables, since paths would have >> to >> be VLAN-dependent. >> >> So, I think the basic strategies are: >> >> a) create as much connectivity as possible between RBridge >> neighbors. If >> R1, R2, and R3 are on the same >> shared/bridged link, and R1 can only talk to R2 if it puts "VLAN X" >> into >> the header, and R1 can only >> talk to R3 if it puts "VLAN Y" into the header, R1 discovers this >> case >> by being configured that the >> link needs either VLAN X or VLAN Y tags, sends IS-IS Hellos with >> both, >> and wdiscovers that on the >> adjacency to R2, R1 has to stick "VLAN X" and to R3, R1 has to >> stick >> "VLAN Y". So R1 does whatever >> is necessary to talk to its neighbors, but it is only relevant on >> the >> hop. R1 reports in its link state packet that >> it has a neighbor R2, and R3. All RBridges can use the link for >> transit >> for all VLANs. >> >> b) only allow R1 and R2 to be IS-IS neighbors if they can talk to >> each >> other with a null VLAN tag. A link >> that requires a VLAN tag can only be used as an ingress or egress >> link >> from the cloud. >> >> c) copy the VLAN tag to the outer header, assume any link that >> requires >> a particular VLAN tag wants to exclude >> transit traffic for all other VLANs, or even for null tags, on the >> link >> Run separate core instances of IS-IS for >> each VLAN tag. Perhaps announcing in the VLAN A instance, all VLAN >> A >> links, plus links that allow >> for null tags. >> >> d) like with c), but allow a link to be configured as "there are >> VLAN A >> endnodes here, but transit traffic for any VLAN >> is fine". >> >> Solutions c) and d) require separate forwarding tables per VLAN, >> and >> either separate instances of IS-IS, or >> a link attribute that lists legal VLAN tags for the link. VLAN A >> segments might become disconnected >> because although there is RBridge connectivity, it isn't through >> links >> that say it's OK to have VLAN A traffic. >> >> Radia >> >> >> _______________________________________________ >> rbridge mailing list >> rbridge@postel.org >> http://mailman.postel.org/mailman/listinfo/rbridge >> >> > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > Received: from mail-mta.sunlabs.com (edge.sunlabs.com [204.153.12.50]) by boreas.isi.edu (8.13.8/8.13.8) with ESMTP id kB1JwlYt009320 for <rbridge@postel.org>; Fri, 1 Dec 2006 11:58:47 -0800 (PST) Received: from sml-sfvt3a.sfvic.sunlabs.com ([152.70.2.254]) by dps.sfvic.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTP id <0J9M0020Q25VX820@dps.sfvic.sunlabs.com> for rbridge@postel.org; Fri, 01 Dec 2006 11:58:43 -0800 (PST) Received: from sunlabs.com ([152.70.2.254]) by mail-srv.sfvic.sunlabs.com (Sun Java System Messaging Server 6.1 HotFix 0.02 (built Aug 25 2004)) with ESMTP id <0J9M003AG25UOF50@mail-srv.sfvic.sunlabs.com> for rbridge@postel.org; Fri, 01 Dec 2006 11:58:42 -0800 (PST) Received: from [152.70.2.164] (Forwarded-For: [67.160.72.180]) by mail-srv.sfvic.sunlabs.com (mshttpd); Fri, 01 Dec 2006 11:58:42 -0800 Date: Fri, 01 Dec 2006 11:58:42 -0800 From: Radia.Perlman@sun.com To: Radia Perlman <Radia.Perlman@sun.com> Message-id: <71a9647c60f2.457018f2@sunlabs.com> MIME-version: 1.0 X-Mailer: Sun Java(tm) System Messenger Express 6.1 HotFix 0.02 (built Aug 25 2004) Content-type: text/plain; charset=us-ascii Content-language: en Content-transfer-encoding: 7BIT Content-disposition: inline X-Accept-Language: en Priority: normal X-ISI-4-43-8-MailScanner: Found to be clean X-MailScanner-From: radia.perlman@sun.com Cc: rbridge@postel.org Subject: Re: [rbridge] VLAN tags, inner/outer, revisted and summarized X-BeenThere: rbridge@postel.org X-Mailman-Version: 2.1.6 Precedence: list List-Id: "Developing a hybrid router/bridge." <rbridge.postel.org> List-Unsubscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=unsubscribe> List-Archive: <http://mailman.postel.org/pipermail/rbridge> List-Post: <mailto:rbridge@postel.org> List-Help: <mailto:rbridge-request@postel.org?subject=help> List-Subscribe: <http://mailman.postel.org/mailman/listinfo/rbridge>, <mailto:rbridge-request@postel.org?subject=subscribe> X-List-Received-Date: Fri, 01 Dec 2006 19:59:03 -0000 Status: RO Content-Length: 5908 Silvano explained a reason for an "outer" vs an "inner" VLAN tag, which is really to accomplish making a 24-bit VLAN tag, hierarchically assigned by 12 bits for customer, and 12 bits for use by that customer. The only changes we'd need to the base spec is as follows: a) the VLAN tag specified in the per-VLAN IS-IS instance would be 24 bits instead of 12 (the per-VLAN instance is the thing where R1 says what endnodes are attached, and whether R1 has an IP multicast router attached, and what IP multicast groups have members attached). b) For unicast traffic: the ingress RBridge R1 looks up the egress RBridge R2 based on the 24-bit VLAN tag, (using the 12 bits in the frame indicating the customer-defined VLAN, plus 12 bits R1 infers based on which port R1 received the frame from) R1 puts the "which customer" portion of the VLAN tag in the outer header. The reason for this is in case R2 has ports to two different customers, and there are overlapping endnode address spaces, R2 will need the outer VLAN tag to determine which port to decapsulate the frame onto. c) for unknown destination/multicast: the ingress RBridge R1 puts the "which customer" portion of the VLAn tag into an outer VLAN tag, and RBridges in the core filter based on the 24-bit VLAN by using both the inner and outer 12 bits. This proposal still treats the infrastructure (all the transit links) as shared by all VLANs, which I like the robustness and simplicity of. Radia ----- Original Message ----- From: Radia Perlman <Radia.Perlman@sun.com> Date: Thursday, November 30, 2006 7:36 pm Subject: [rbridge] VLAN tags, inner/outer, revisted and summarized > There's been a lot of discussion, and I believe this is what is > going > on: In this email I will attempt to just > explain, and not advocate. If I want to express opinions, I'll > reply to > this. > > The first question we have to ask is what things people are doing > with > VLANs. The next is to ask > which subset of these (possibly "all") we want to support with > TRILL, > and to answer that we have > to also answer what the cost/benefit of solving each with TRILL is. > > Things VLANs can provide: > a) separate endnodes into communities, to enforce that only VLAN A > nodes > can talk to VLAN A nodes > b) scoping things like ARP, so an ARP for a VLAN A node only gets > sent > on VLAN A links > c) security -- making sure that VLAN A nodes cannot snoop on VLAN B > trafficd) provisioning -- making sure that the only traffic on a > VLAN A link is > VLAN A traffic, or > perhaps BGP-policy-like, as in, "this link is willing to carry > VLANs A, > B, and Q, but not D". > > Perhaps this is not an exhaustive list, but I hope it's close enough. > > What are the costs of providing these things? > > The solution that I'd been assuming solves a) and b). That solution > is > summarized as follows: > If RBridges R1 and R2 are on the same link, they are neighbors, and > they > can send transit traffic to each other, > regardless of the VLAN on which it originated. This can be thought > of as > RBridges create a cloud, > which keeps VLAN traffic segregated at the endpoints, but is a > single > shared infrastructure for all > VLANs within the cloud. > > That solution does not solve c) and d), though if the transit links > are > all point-to-point links > between RBridges, this is moot. The case that isn't solved is when > a > link is both a transit link > and a shared link with a bunch of endnodes in a VLAN. > > Suppose we want to solve those? > > What I think people would be asking for is to have the VLAN > determine > not just the destination, but what > path the packet takes. So some links would only allow certain VLAN > traffic on them, even for transit. > Which would mean multiple forwarding tables, since paths would have > to > be VLAN-dependent. > > So, I think the basic strategies are: > > a) create as much connectivity as possible between RBridge > neighbors. If > R1, R2, and R3 are on the same > shared/bridged link, and R1 can only talk to R2 if it puts "VLAN X" > into > the header, and R1 can only > talk to R3 if it puts "VLAN Y" into the header, R1 discovers this > case > by being configured that the > link needs either VLAN X or VLAN Y tags, sends IS-IS Hellos with > both, > and wdiscovers that on the > adjacency to R2, R1 has to stick "VLAN X" and to R3, R1 has to > stick > "VLAN Y". So R1 does whatever > is necessary to talk to its neighbors, but it is only relevant on > the > hop. R1 reports in its link state packet that > it has a neighbor R2, and R3. All RBridges can use the link for > transit > for all VLANs. > > b) only allow R1 and R2 to be IS-IS neighbors if they can talk to > each > other with a null VLAN tag. A link > that requires a VLAN tag can only be used as an ingress or egress > link > from the cloud. > > c) copy the VLAN tag to the outer header, assume any link that > requires > a particular VLAN tag wants to exclude > transit traffic for all other VLANs, or even for null tags, on the > link > Run separate core instances of IS-IS for > each VLAN tag. Perhaps announcing in the VLAN A instance, all VLAN > A > links, plus links that allow > for null tags. > > d) like with c), but allow a link to be configured as "there are > VLAN A > endnodes here, but transit traffic for any VLAN > is fine". > > Solutions c) and d) require separate forwarding tables per VLAN, > and > either separate instances of IS-IS, or > a link attribute that lists legal VLAN tags for the link. VLAN A > segments might become disconnected > because although there is RBridge connectivity, it isn't through > links > that say it's OK to have VLAN A traffic. > > Radia > > > _______________________________________________ > rbridge mailing list > rbridge@postel.org > http://mailman.postel.org/mailman/listinfo/rbridge >
- [rbridge] Multiple instance/hierarchical RBridge … Radia Perlman