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

Gert Doering <gert@space.net> Tue, 04 July 2017 08:38 UTC

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Date: Tue, 04 Jul 2017 10:38:53 +0200
From: Gert Doering <gert@space.net>
To: Robert Raszuk <robert@raszuk.net>
Cc: PFRC - jhaas <jhaas@pfrc.org>, idr wg <idr@ietf.org>
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Subject: Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-03.txt
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Hi,

On Tue, Jul 04, 2017 at 12:31:17AM +0200, Robert Raszuk wrote:
> If client talks add-paths you send them two paths. You may send them more
> if they wish so.
> 
> It is just broken desing to signal failure between nodes to get new paths.
> PIC has proven this long time back.
> 
> What this is about is really a new idea of sdn controller with bgp and
> distributed bfd for weak clients.
> 
> Now maybe we could understand what are those weak clients who can not
> handle two paths for a given net ?

What makes you assume that these two paths will *work*?

IXPs are big (like, 600 nodes), and there might be a partial outage that 
kills off everything behind one 100G link in a 4x 100G bundle -> 100+
remotes are gone.

Two paths won't do much good then, if both next-hops are in that set.

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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