Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-03.txt

"John G. Scudder" <jgs@juniper.net> Mon, 03 July 2017 21:18 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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Date: Mon, 03 Jul 2017 17:18:37 -0400
Cc: Randy Bush <randy@psg.com>, idr@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/KEqbmPS1QBbKLcjohFPa27SbwvU>
Subject: Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-03.txt
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> On Jul 3, 2017, at 5:10 PM, Job Snijders <job@ntt.net> wrote:
> 
> 
> On Mon, 3 Jul 2017 at 22:53, Randy Bush <randy@psg.com <mailto:randy@psg.com>> wrote:
> > I don't follow. If the route server facilitates you in setting up BFD to
> > all "nexthops of interest", the route server's job is done, right? Any RS
> > peer has the ability to locally verify reacahbility across the fabric and
> > route accordingly.
> 
> route servers are for the small folk who can not do full mesh, let alone
> add path and other fancy things.  the rs IS their control plane, period.
> 
> If a device can't do add-path, can we really expect these devices to do fancy things like opportunistic "route server assisted" BFD to all next-hops of interest?
> 
> If we operate under the assumption that these clients can't support receiving multiple paths through add-path, I envision a somewhat ugly cadence:
> 
> 1) Hey RS, can't reach A
> 2) Ok, here try reaching A via B
> 3) hey RS, I can't reach B either
> Etc, etc

If that cadence happens, they haven't implemented what's in rs-bfd, right? So why would even #1 happen?

--John