4 byte ASNs through OpenBGPd to old Cisco IOS

Wed Sep 23 21:04:24 UTC 2015

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