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Re: [Int-area] Fwd: New Version Notification for draft-nordmark-intarea-ippl-01.txt

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 05 November 2015 09:28 UTC

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Date: Thu, 05 Nov 2015 10:28:35 +0100
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Dave Thaler <dthaler@microsoft.com>
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Cc: Internet Area <int-area@ietf.org>, Erik Nordmark <nordmark@sonic.net>
Subject: Re: [Int-area] Fwd: New Version Notification for draft-nordmark-intarea-ippl-01.txt
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On Thu, 5 Nov 2015, Dave Thaler wrote:

> I notice that currently RFC 4389 is not referenced at all.
> It’s Experimental since there are many ways of proxying and it just describes one of them,
> but I still think it bears referencing informatively, especially since section 6 of that RFC is
> very relevant to the discussion on loops in the document.

I have in live networks running spanning tree and HSRP seen issue with the 
L2 mac learning timeout being 300 second (cisco default) and arp timeout 
being 4 hours (also cisco timeout) where in certain topologies the L2 
switch would not see one of the routers mac address until the arp 
timeouted, and flooded all traffic to that router to all switches.

The problem was "fixed" by turning down the arp timeout to 270 seconds.

THis is not exactly what your draft describes, but it might still be worth 
mentioning?

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

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