[112336] in North American Network Operators' Group
Illegal header length in BGP error
daemon@ATHENA.MIT.EDU (Matthew Huff)
Tue Feb 24 09:48:56 2009
From: Matthew Huff <mhuff@ox.com>
To: "'nanog@nanog.org'" <nanog@nanog.org>
Date: Tue, 24 Feb 2009 09:48:46 -0500
In-Reply-To: <49A3F61B.9020007@brightok.net>
Errors-To: nanog-bounces@nanog.org
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One of our upstream providers flapped this morning, and since then they =
are
sending corrupted BPG data. I'm running 12.4(22)T on cisco 7200s. I'm
getting no BGP errors from that providers and the number of routes and =
basic
sanity check looks okay. However, when it tries to redistribute the bgp
routes via iBGP to our other board routers, we get:
003372: Feb 24 09:17:13.963 EST: %BGP-5-ADJCHANGE: neighbor x.x.x.x Down =
BGP
Notification sent
003373: Feb 24 09:17:13.963 EST: %BGP-3-NOTIFICATION: sent to neighbor
x.x.x.x 1/2 (illegal header length) 2 bytes =20
All routes have identical hardware and IOS versions. My google and cisco
search fu leads me to the AS path length bug, but the interesting thing =
is
that since we have "bgp maxas-limit 75" configured and a recent IOS, we
haven't had the problem before when other people were reporting issues. =
I've
also looked at the path mtu issue, and although we haven't had a problem
before I disabled bgp mtu path discovery, but have the same issues.
Anyone seeing something like this today, and or does anyone have a
suggestion on finding out more specific info (which as path for example =
so I
can filter it)?
----
Matthew Huff=A0=A0=A0=A0=A0=A0 | One Manhattanville Rd
OTA Management LLC | Purchase, NY 10577
http://www.ox.com | Phone: 914-460-4039
aim: matthewbhuff=A0 | Fax:=A0=A0 914-460-4139
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