[183992] in North American Network Operators' Group
Re: 4 byte ASNs through OpenBGPd to old Cisco IOS
daemon@ATHENA.MIT.EDU (Simon Lockhart)
Wed Sep 23 17:04:50 2015
X-Original-To: nanog@nanog.org
Date: Wed, 23 Sep 2015 22:04:24 +0100
From: Simon Lockhart <simon@slimey.org>
To: Mike Hammett <nanog@ics-il.net>
In-Reply-To: <302295212.7028.1443040722069.JavaMail.mhammett@ThunderFuck>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Wed Sep 23, 2015 at 03:37:31PM -0500, Mike Hammett wrote:
> Do any of you have any useful input other than they need to upgrade their IOS
> to something newer than 4.5 years old?
I recently went through a very similar issue, and was convinced it was related
to 32 bit ASNs.
Are they seeing this error?
Sep 1 08:40:41.506 UTC: %BGP-3-NOTIFICATION: sent to neighbor xxx.xxx.xxx.xxx 3/11 (invalid or corrupt AS path) 11 bytes 40020802 033C3424 580097
If so, have they configured "no bgp enforce-first-as" in their BGP router
config?
Simon
