Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf
Santosh P K <santosh.pallagatti@gmail.com> Mon, 28 October 2019 15:02 UTC
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References: <D2BB4EDE-97FD-4A82-A93D-45203A34A339@cisco.com> <CA0B675FC61D874D8A9EB2C7B5CEA7872B6A7E11@MISOUT7MSGUSRDG.ITServices.sbc.com> <1DBF92B2-D384-4071-9156-B20795F099AB@cisco.com> <CAEFuwki8QBRL=ZXFy46RCgTyUX4ffYvVAeRe-rFwbcqL=zLRLw@mail.gmail.com> <0A1F41E2-AC1E-4724-A8B6-DE855088FDF4@cisco.com> <1B89E943-C2D0-41C9-B8FE-17CA7F0240EA@cisco.com> <CAEFuwkg_dg2ASfjqzo1_MAfOHh+HB6jLecftFgRh0wTaYRJgYA@mail.gmail.com> <CAEFuwkhuP4J_1RHNU-JyUReE8ZTLZgendPivHL4zHGOszXkaEw@mail.gmail.com>
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From: Santosh P K <santosh.pallagatti@gmail.com>
Date: Mon, 28 Oct 2019 20:32:44 +0530
Message-ID: <CACi9rduPuTWM7WJOzmi+tvFDG5gYwyDGzUO9+cSkWJi6s3fMQA@mail.gmail.com>
To: Pushpasis Sarkar <pushpasis.ietf@gmail.com>
Cc: "Acee Lindem (acee)" <acee@cisco.com>, "YADLAPALLI, CHAITANYA" <cy098d@att.com>, "lsvr@ietf.org" <lsvr@ietf.org>
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Subject: Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf
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All, Can anyone please help me with BGP-LS-SPF packet hex dump? We have code added for encode and decode and wanted to understand if we can get some hexdump to interop. Thanks Santosh P K On Thu, Oct 10, 2019 at 12:15 PM Pushpasis Sarkar <pushpasis.ietf@gmail.com> wrote: > *Hi Acee, * > > *Needed one more clarification below.* > > On Wed, Oct 2, 2019 at 1:03 AM Pushpasis Sarkar <pushpasis.ietf@gmail.com> > wrote: > >> Hi Acee, >> >> Just saw the latest version of the draft. I wanted to understand what is >> the exact difference between the values 1 and 2. Just to clarify my doubt >> let's consider a prefix P that is only originated by node N. Now what will >> be the reachability of prefix P in the two scenarios (first with SPF Status >> TLV value set to 1 vs with SPF Status TLV value set to 2). Will P be >> unreachable in both cases? My understanding is it should still be reachable >> when the value is set to 2. >> >> If my understanding is correct, then perhaps we need more clarifications >> on the following text.. especially for the case there is no next link from >> this node. >> >> "If the current Node NLRI attributes includes the SPF status >> >> TLV (Section 4.1.2) and the status indicates that the Node >> >> doesn't support transit, the next link for the current node is >> processed." >> > *[Pushpasis] This condition applies to all the links originating from this > current node NLRI. So does it mean none of the links origination from the > current node will be processed? If so, the last statement ("the next link > for the current node is processed") part is misleading. We can perhaps > re-work to avoid processing any of the links from the current node NLRI > under such scenario in a different step between step 4 and step 5.* > > *Thanks* > *-Pushpasis* > > >> If the P is unreachable in the later case too (value set to 2), then I >> don't see what is the difference between using the values 1 and 2. >> >> Thanks >> -Pushpasis >> >> >> >> >> >> >> On Sun, Sep 29, 2019 at 12:15 PM Acee Lindem (acee) <acee@cisco.com> >> wrote: >> >>> After discussion with my co-authors and Pushpasis, we are planning on >>> defining an SPF Status TLV for the Node Attribute NLRI analogous to the one >>> defined for Links and Prefixes. However, for the Node Attribute TLV, the >>> status would have an additional value indicating the node should not be >>> used for transit traffic. >>> >>> >>> >>> 0 – Reserved >>> >>> 1 – Node unreachable with respect to BGP SPF >>> >>> 2 – Node does not support transit with respect >>> to BGP SPF >>> >>> 3-254 – Undefined >>> >>> 255 – Reserved >>> >>> >>> >>> Comments? >>> >>> >>> >>> Thanks, >>> >>> Acee >>> >>> >>> >>> >>> >>> *From: *Lsvr <lsvr-bounces@ietf.org> on behalf of Acee Lindem < >>> acee@cisco.com> >>> *Date: *Thursday, September 26, 2019 at 10:15 AM >>> *To: *Pushpasis Sarkar <pushpasis.ietf@gmail.com> >>> *Cc: *"YADLAPALLI, CHAITANYA" <cy098d@att.com>, "lsvr@ietf.org" < >>> lsvr@ietf.org> >>> *Subject: *Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf >>> >>> >>> >>> Hi Pushpasis, >>> >>> This OSPFv3 R Bit and IS-IS O bit are basically the same functionality. >>> The node is not used for transit but is used for local prefixes. >>> >>> Thanks, >>> >>> Acee >>> >>> >>> >>> *From: *Pushpasis Sarkar <pushpasis.ietf@gmail.com> >>> *Date: *Thursday, September 26, 2019 at 2:53 AM >>> *To: *Acee Lindem <acee@cisco.com> >>> *Cc: *"YADLAPALLI, CHAITANYA" <cy098d@att.com>, "lsvr@ietf.org" < >>> lsvr@ietf.org> >>> *Subject: *Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf >>> >>> >>> >>> Hi Chaitanya and Acee, >>> >>> >>> >>> How about the 'O' bit in Node-Flag-Bits TLV defined in RFC 7752 section >>> 3.3.1.1? I suppose the node can set the 'O' bit when it wants to take >>> itself out from all transit paths. I know the 'O' bit is more related to >>> the scenario when ISIS topology is being exported in BGP-LS. But I suppose >>> we can use that for BGP-LS-SPF as well. >>> >>> >>> >>> Thanks >>> >>> -Pushpasis >>> >>> >>> >>> On Tue, Sep 24, 2019 at 8:35 PM Acee Lindem (acee) <acee@cisco.com> >>> wrote: >>> >>> Hi Chaitanya, >>> >>> I think this is a good idea and will discuss with my co-authors. >>> >>> Thanks, >>> Acee >>> >>> >>> >>> *From: *"YADLAPALLI, CHAITANYA" <cy098d@att.com> >>> *Date: *Tuesday, September 24, 2019 at 11:02 AM >>> *To: *Acee Lindem <acee@cisco.com>, "lsvr@ietf.org" <lsvr@ietf.org> >>> *Subject: *RE: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf >>> >>> >>> >>> Correct like a R-Bit. >>> >>> >>> >>> I have read this draft and I support it. >>> >>> >>> >>> Thanks, >>> >>> Chaitanya >>> >>> >>> >>> >>> >>> This communication may contain information that is privileged, or >>> confidential.. If you are not the intended recipient, please note that any >>> dissemination, distribution or copying of this communication is strictly >>> prohibited. Anyone who receives this message in error should notify the >>> sender immediately by telephone or by return e-mail and delete it from his >>> or her computer. >>> >>> >>> >>> >>> >>> >>> >>> *From:* Acee Lindem (acee) <acee@cisco.com> >>> *Sent:* Tuesday, September 24, 2019 10:42 AM >>> *To:* YADLAPALLI, CHAITANYA <cy098d@att.com>; lsvr@ietf.org >>> *Subject:* Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf >>> >>> >>> >>> Hi Chaitanya, >>> >>> >>> >>> Exactly what do you mean by node cost out and what use case are you >>> trying to satisfy. If a node wants to remove itself from the topology, it >>> can simply withdraw its link NLRI. However, are you looking for a mechanism >>> similar to the OSPFv3 R-Bit as a Node NLRI SPF Attribute? >>> >>> >>> >>> R-bit >>> >>> This bit (the `Router' bit) indicates whether the originator is an >>> >>> active router. If the router bit is clear, then routes that >>> >>> transit the advertising node cannot be computed. Clearing the >>> >>> router bit would be appropriate for a multi-homed host that wants >>> >>> to participate in routing, but does not want to forward non- >>> >>> locally addressed packets. >>> >>> >>> >>> Thanks, >>> Acee >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> *From: *Lsvr <lsvr-bounces@ietf.org> on behalf of "YADLAPALLI, >>> CHAITANYA" <cy098d@att.com> >>> *Date: *Tuesday, September 24, 2019 at 10:31 AM >>> *To: *"lsvr@ietf.org" <lsvr@ietf.org> >>> *Subject: *[Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf >>> >>> >>> >>> Hi Authors, >>> >>> The draft does not explicitly call out mechanisms for node cost out. It >>> would be good to call out mechanisms to cost out a node explicitly. >>> >>> >>> >>> Thanks, >>> >>> Chaitanya >>> >>> >>> >>> >>> >>> *Chaitanya Yadlapalli* >>> >>> Network Infrastructure And Services >>> >>> >>> >>> *AT&T Services, Inc.* >>> >>> 200 S Laurel Ave, Middletown, NJ 07722 >>> >>> o 732.420.7977 | cy098d@att.com >>> >>> >>> >>> This communication may contain information that is privileged, or >>> confidential.. If you are not the intended recipient, please note that any >>> dissemination, distribution or copying of this communication is strictly >>> prohibited. Anyone who receives this message in error should notify the >>> sender immediately by telephone or by return e-mail and delete it from his >>> or her computer. >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Lsvr mailing list >>> Lsvr@ietf.org >>> https://www.ietf.org/mailman/listinfo/lsvr >>> >>> _______________________________________________ > Lsvr mailing list > Lsvr@ietf.org > https://www.ietf.org/mailman/listinfo/lsvr >
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf YADLAPALLI, CHAITANYA
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf YADLAPALLI, CHAITANYA
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Keyur Patel
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Keyur Patel
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Jason Black
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Santosh P K
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Keyur Patel
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Jeff Tantsura
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Acee Lindem (acee)
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Santosh P K
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Pushpasis Sarkar
- Re: [Lsvr] Mail regarding draft-ietf-lsvr-bgp-spf Santosh P K