[rbridge] Consensus Check: Point to Point links
Donald.Eastlake at motorola.com (Eastlake III Donald-LDE008) Fri, 05 October 2007 12:28 UTC
From: "Donald.Eastlake at motorola.com"
Date: Fri, 05 Oct 2007 08:28:27 -0400
Subject: [rbridge] Consensus Check: Point to Point links
In-Reply-To: <4705D433.5010902@cisco.com>
References: <3870C46029D1F945B1472F170D2D9790031840BA@de01exm64.ds.mot.com> <47050BCA.5030003@sun.com> <4C94DE2070B172459E4F1EE14BD2364E7B018B@HQ-EXCH-5.corp.brocade.com> <3870C46029D1F945B1472F170D2D9790031CAD29@de01exm64.ds.mot.com> <4705D433.5010902@cisco.com>
Message-ID: <3870C46029D1F945B1472F170D2D9790031CAD65@de01exm64.ds.mot.com>
I don't see any inconsistency between your statement and my statement. Donald -----Original Message----- From: Dinesh G Dutt [mailto:ddutt at cisco.com] Sent: Friday, October 05, 2007 2:06 AM To: Eastlake III Donald-LDE008 Cc: Anoop Ghanwani; Rbridge at postel.org Subject: Re: [rbridge] Consensus Check: Point to Point links Hi Donald, BPDUs in the L2 world (such as STP, LLDP etc.) are typically identified by MAC addresses, not ethertype. Some newer protocols such as CFM & OAM are identified by ethertype and there is supposedly a move to identify newer BPDUs using ethertype. The frames we're talking of sending with a fixed (or reserved) address are the data frames. BPDUs including IS-IS will use the regular MAC address. Dinesh Eastlake III Donald-LDE008 wrote: > Actually, although I'm not entirely sure, I believe that BPDUs, LLDP > PDUs, etc., all start with an Ethertype which identifies them so, in > principle, they could be made to work on a specially equipped point to > point link with no outer MAC addresses. However, I don't think anyone > has proposed that TRILL should consider omitting the outer MAC addresses > except when that suggestion appears as part of a question asking why, if > you want to do some optimization on a point-to-point link, you don't > want to do even more optimization. > > Donald > > -----Original Message----- > From: Anoop Ghanwani [mailto:anoop at brocade.com] > Sent: Thursday, October 04, 2007 1:46 PM > To: Radia Perlman; Eastlake III Donald-LDE008 > Cc: Rbridge at postel.org > Subject: RE: [rbridge] Consensus Check: Point to Point links > > > > >> -----Original Message----- >> From: rbridge-bounces at postel.org >> [mailto:rbridge-bounces at postel.org] On Behalf Of Radia Perlman >> Sent: Thursday, October 04, 2007 8:51 AM >> To: Eastlake III Donald-LDE008 >> Cc: Rbridge at postel.org >> Subject: Re: [rbridge] Consensus Check: Point to Point links >> >> Personally, I need a reminder of what we are trying to >> accomplish with this before I can have any opinion. >> >> a) Is omitting the outer VLAN tag to save space? >> b) Why put in anything for destination address other than the >> MAC address of the next hop RBridge, or put in anything into >> the source address other than your own MAC address? >> It won't save space. So what does it gain? >> c) Is there any danger if an RBridge is confused about >> whether this is a pt-to-pt link or not? >> >> I can see the advantage of omitting the entire outer header >> if it is somehow absolutely known this is a pt-to-pt link, >> and both ends of the link understand this. >> > > That wouldn't work because there are other frames that will > have to have MAC addresses, e.g. LACP, LLDP. > > >> But that isn't >> what's being proposed here. It seems to be only omitting the >> VLAN tag, and allowing insertion of random addresses into the >> source and destination fields in the outer header, if I'm >> reading it correctly. >> > > I don't like the idea of random addresses (is it that > a big a deal to set them correctly?), but as long as > it's completely optional, I don't really care. > [By the way, even though the proposal says that it > can be random, it really can't because we have to > say that they cannot be from the BPDU address space > or things like LACP and LLDP will break.] > > Anoop > > _______________________________________________ > rbridge mailing list > rbridge at postel.org > http://mailman.postel.org/mailman/listinfo/rbridge > > -- We make our world significant by the courage of our questions and by the depth of our answers. - Carl Sagan
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Eric Gray
- [rbridge] Consensus Check: Point to Point links Anoop Ghanwani
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Caitlin Bestler
- [rbridge] Consensus Check: Point to Point links Eric Gray
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Eric Gray
- [rbridge] Consensus Check: Point to Point links Dinesh G Dutt
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Anoop Ghanwani
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Eric Gray
- [rbridge] Consensus Check: Point to Point links Eric Gray
- [rbridge] Consensus Check: Point to Point links Eric Gray
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Radia Perlman
- [rbridge] Consensus Check: Point to Point links Caitlin Bestler
- [rbridge] Consensus Check: Point to Point links Anoop Ghanwani
- [rbridge] Consensus Check: Point to Point links Eric Gray
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Dinesh G Dutt
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Check: Point to Point links Radia Perlman
- [rbridge] Consensus Check: Point to Point links Caitlin Bestler
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Silvano Gai
- [rbridge] Consensus Check: Point to Point links Anoop Ghanwani
- [rbridge] Consensus Check: Point to Point links Joe Touch
- [rbridge] Consensus Check: Point to Point links Eastlake III Donald-LDE008
- [rbridge] Consensus Withdrawn: Point to Point lin… Eastlake III Donald-LDE008