Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Wed, 14 May 2014 15:23 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Hannes Gredler <hannes@juniper.net>
Thread-Topic: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt
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Date: Wed, 14 May 2014 15:22:54 +0000
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Subject: Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt
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Hannes -

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. 

Further, the potential use of multiple S-BFD discriminator values by a given node gets into an application area that we have deliberately avoided. One can imagine that S-BFD may want to use different discriminator values for much more than just different address families - in which case the mapping between a given discriminator and a given usage will not be addressed simply by associating the discriminator with an IPv4/IPv6 address. Such cases will no doubt be discussed within BFD WG as part of the S-BFD work - but at this point we really want to keep the IGP advertisements out of this area.

   Les


> -----Original Message-----
> From: Hannes Gredler [mailto:hannes@juniper.net]
> Sent: Wednesday, May 14, 2014 7:08 AM
> To: Les Ginsberg (ginsberg)
> Cc: isis-wg@ietf.org; rtg-bfd@ietf.org
> Subject: Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-
> discriminator-00.txt
> 
> hi les,
> 
> making the S-BFD discriminator a sole node-property feels a bit coarse
> for my taste. i'd rather carry this in a IP prefix advertisement,
> such that i have more granular control *what* (particular links/loopback
> etc.)
> gets BFD-tested. also i'd would like that the receiver gets some idea what
> address family (v4/v6) a S-BFD is related to.
> 
> /hannes
> 
> On May 8, 2014, at 4:48 PM, Les Ginsberg (ginsberg) wrote:
> 
> > FYI - this new draft describes how to advertise S-BFD Discriminators using
> IS-IS.
> >
> > Comments are welcomed.
> >
> >    Les
> >
> >
> > -----Original Message-----
> > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > Sent: Thursday, May 08, 2014 7:46 AM
> > To: Mach Chen; Nobo Akiya (nobo); Mach Chen; Les Ginsberg (ginsberg);
> Nobo Akiya (nobo); Les Ginsberg (ginsberg)
> > Subject: New Version Notification for draft-ginsberg-isis-sbfd-
> discriminator-00.txt
> >
> >
> > A new version of I-D, draft-ginsberg-isis-sbfd-discriminator-00.txt
> > has been successfully submitted by Les Ginsberg and posted to the
> > IETF repository.
> >
> > Name:		draft-ginsberg-isis-sbfd-discriminator
> > Revision:	00
> > Title:		Advertising S-BFD Discriminators in IS-IS
> > Document date:	2014-05-08
> > Group:		Individual Submission
> > Pages:		5
> > URL:            http://www.ietf.org/internet-drafts/draft-ginsberg-isis-sbfd-
> discriminator-00.txt
> > Status:         https://datatracker.ietf.org/doc/draft-ginsberg-isis-sbfd-
> discriminator/
> > Htmlized:       http://tools.ietf.org/html/draft-ginsberg-isis-sbfd-
> discriminator-00
> >
> >
> > Abstract:
> >   This document defines a means of advertising one or more S-BFD
> >   Discriminators using the IS-IS Router Capability TLV.
> >
> >
> >
> >
> >
> > Please note that it may take a couple of minutes from the time of
> submission
> > until the htmlized version and diff are available at tools.ietf.org.
> >
> > The IETF Secretariat
> >
> > _______________________________________________
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