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

Hannes Gredler <hannes@juniper.net> Wed, 14 May 2014 15:27 UTC

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From: Hannes Gredler <hannes@juniper.net>
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Date: Wed, 14 May 2014 17:26:52 +0200
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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Subject: Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt
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On May 14, 2014, at 5:22 PM, Les Ginsberg (ginsberg) wrote:

> 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. 

well it would help first endpoint discovery and pinning down BFD traffic to particular line card.

> 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.
> 

i am just saying 1 discriminator seems overly restrictive to me and
having support for more-than 1 would be a good idea to start with;


>> -----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
>>> 
>>> _______________________________________________
>>> Isis-wg mailing list
>>> Isis-wg@ietf.org
>>> https://www.ietf.org/mailman/listinfo/isis-wg
>