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Re: bgp update destroying transit on redback routers ?
From: Christopher Morrow <morrowc.lists () gmail com>
Date: Fri, 2 Dec 2011 16:06:31 -0500

On Fri, Dec 2, 2011 at 9:35 AM, Alexandre Snarskii <snar () snar spb ru> wrote:

This draft says that

...note it's a DRAFT, not a STANDARD...

If a BGP speaker receives a route which has an AS number of zero in the
AS_PATH (or AS4_PATH) attribute, it SHOULD be logged and treated as a
WITHDRAW. This same behavior applies to routes containing zero as the
Aggregator or AS4 Aggregator.

but observed behaviour was more like following:

If a BGP speaker receives [bad route] it MUST close session immediately
with NOTIFICATION Error Code 'Update Message Error' and subcode 'Error with
optional attribute'.

hence this old behavor

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