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

"John G. Scudder" <jgs@juniper.net> Tue, 04 July 2017 15:55 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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Date: Tue, 04 Jul 2017 11:55:23 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/ZeLgccyN_ULMocRv6yDpRdksK8Q>
Subject: Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-03.txt
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One observation regarding the "RR won't scale if it has to do per-client route selection" concern -- it seems to me it would be entirely feasible for an implementation to associate some figure-of-merit with each next hop, a function of its reported reachability by each of its indirect peers. That figure-of-merit could be used during traditional (not per-client) route selection. The general idea would be "if one other client can't reach you, that's their problem, if dozens of other clients can't reach you, maybe we should choose a different next hop if we've got one" [*]. Think of it as making the binary resolvability condition of RFC 4271 9.1.2.1 fuzzy.

I think specifying the function would be beyond the scope of this (or really, any) draft since it's "just policy". But it demonstrates there's some potential benefit from the proposal without going all the way down to per-client route selection.

--John

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