Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt
Hannes Gredler <hannes@juniper.net> Wed, 14 May 2014 16:23 UTC
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From: Hannes Gredler <hannes@juniper.net>
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Date: Wed, 14 May 2014 18:22:57 +0200
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References: <20140508144606.23448.98448.idtracker@ietfa.amsl.com> <F3ADE4747C9E124B89F0ED2180CC814F23D873B9@xmb-aln-x02.cisco.com> <9DDF3832-A276-40F1-AF24-2CEAB31E63DC@juniper.net> <F3ADE4747C9E124B89F0ED2180CC814F23DB5518@xmb-aln-x02.cisco.com> <922372D3-6CE8-461E-9BD4-94C2B050C37D@juniper.net> <20140514153641.GC13993@pfrc> <CECE764681BE964CBE1DFF78F3CDD3941E14ED44@xmb-aln-x01.cisco.com> <20140514155739.GA14148@juniper.net> <CECE764681BE964CBE1DFF78F3CDD3941E14EDA1@xmb-aln-x01.cisco.com>
To: "Nobo Akiya (nobo)" <nobo@cisco.com>
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Cc: Jeffrey Haas <jhaas@pfrc.org>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>, "isis-wg@ietf.org" <isis-wg@ietf.org>
Subject: Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt
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nobo, assume that the advertising node only supports BFD4 and the receiving node does support only BFD6. - how to detect such a condition ? /hannes On May 14, 2014, at 6:15 PM, Nobo Akiya (nobo) wrote: > Hi Hannes, > > Please see in-line. > >> -----Original Message----- >> From: Hannes Gredler [mailto:hannes@juniper.net] >> Sent: Wednesday, May 14, 2014 11:58 AM >> To: Nobo Akiya (nobo) >> Cc: Jeffrey Haas; Les Ginsberg (ginsberg); rtg-bfd@ietf.org; isis-wg@ietf.org >> Subject: Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd- >> discriminator-00.txt >> >> On Wed, May 14, 2014 at 03:48:10PM +0000, Nobo Akiya (nobo) wrote: >> | Hi Jeff, >> | >> | > On Wed, May 14, 2014 at 05:26:52PM +0200, Hannes Gredler wrote: >> | > > On May 14, 2014, at 5:22 PM, Les Ginsberg (ginsberg) wrote: >> | > > > Thanx for the comments. >> | > > > I don't see how your proposal solves the problem you are >> | > > > attempting to >> | > address. The sender of the S-BFD packet has no control over what >> | > interface is used to receive the packet on the target node. >> | > Associating it with a prefix will not help in that regard. >> | > > >> | > > well it would help first endpoint discovery and pinning down BFD >> | > > traffic to >> | > particular line card. >> | > >> | > Indeed. In the SPRING related case (or even some MPLS scenarios), >> | > traffic may be heavily steered to a given interface. This interface >> | > may not even be to a router, but may be an ingress for a SFC device >> | > and that ingress is critical for the execution of the chain. >> | >> | In those cases, one should be sending S-BFD packet in-band, which would >> go through the specific interface/LC to reach the reflector session on the >> target node (i.e. outage will be detected regardless of the discriminator >> used). So having separate reflector discriminator won't be adding further >> benefit. >> | >> | Flip side is, if a reflector is hosted on LC 1 and traffic engineered tunnel is >> terminating on LC2, then outage of LC1 can cause the "no S-BFD response" >> on the tunnel terminating on LC2. However, I would think this is a limitation >> with implementation. >> >> what about AF discovery ? - how would a receiver know what AF a S-BFD >> session to bring up with ? > > I was under the impression that IP header (i.e version) can distinguish the AF if implementations required demux'ing received S-BFD packet based on AF. If I missed your point/question, do clarify. > > -Nobo > > _______________________________________________ > Isis-wg mailing list > Isis-wg@ietf.org > https://www.ietf.org/mailman/listinfo/isis-wg
- [Isis-wg] FW: New Version Notification for draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] FW: New Version Notification for dr… Les Ginsberg (ginsberg)
- Re: [Isis-wg] FW: New Version Notification for dr… Sam Aldrin
- Re: [Isis-wg] FW: New Version Notification for dr… Les Ginsberg (ginsberg)
- Re: [Isis-wg] FW: New Version Notification for dr… Jeffrey Haas
- Re: [Isis-wg] FW: New Version Notification for dr… Jeffrey Haas
- Re: [Isis-wg] FW: New Version Notification for dr… Jeffrey Haas
- Re: [Isis-wg] New Version Notification for draft-… Hannes Gredler
- Re: [Isis-wg] New Version Notification for draft-… Hannes Gredler
- Re: [Isis-wg] New Version Notification for draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] New Version Notification for draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] New Version Notification for draft-… Hannes Gredler
- Re: [Isis-wg] New Version Notification for draft-… Hannes Gredler
- Re: [Isis-wg] New Version Notification for draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] New Version Notification for draft-… Jeffrey Haas
- Re: [Isis-wg] New Version Notification for draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] New Version Notification for draft-… Nobo Akiya (nobo)
- Re: [Isis-wg] New Version Notification for draft-… Hannes Gredler
- Re: [Isis-wg] New Version Notification for draft-… Nobo Akiya (nobo)
- Re: [Isis-wg] New Version Notification for draft-… Hannes Gredler
- Re: [Isis-wg] New Version Notification for draft-… Nobo Akiya (nobo)
- Re: [Isis-wg] New Version Notification for draft-… Mach Chen
- Re: [Isis-wg] New Version Notification for draft-… Mach Chen
- Re: [Isis-wg] New Version Notification for draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] New Version Notification for draft-… Nobo Akiya (nobo)
- Re: [Isis-wg] New Version Notification for draft-… Mach Chen
- Re: [Isis-wg] New Version Notification for draft-… Hannes Gredler
- Re: [Isis-wg] New Version Notification for draft-… Gregory Mirsky
- Re: [Isis-wg] New Version Notification for draft-… Nobo Akiya (nobo)
- Re: [Isis-wg] New Version Notification for draft-… Gregory Mirsky
- Re: [Isis-wg] New Version Notification for draft-… Nobo Akiya (nobo)
- Re: [Isis-wg] New Version Notification for draft-… Mach Chen
- Re: [Isis-wg] New Version/Proposed isis-wg docume… Marc Binderberger
- Re: [Isis-wg] New Version/Proposed isis-wg docume… Les Ginsberg (ginsberg)