4 byte ASNs through OpenBGPd to old Cisco IOS

Wed Sep 23 21:20:55 UTC 2015

Fearing you might be on here, I tried to be fairly non-offensive in my post. ;-) 

----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

----- Original Message -----

From: "Richard Irving" <rirving at antient.org> 
To: "Simon Lockhart" <simon at slimey.org>, "Mike Hammett" <nanog at ics-il.net> 
Cc: "NANOG" <nanog at nanog.org> 
Sent: Wednesday, September 23, 2015 4:19:23 PM 
Subject: Re: 4 byte ASNs through OpenBGPd to old Cisco IOS 

They did, and it now formed peering with the RSD. 

Thanks! 

12.4.(24)T is the first version from that IOS train that natively 
supports 4 byte ASN's. 

We can upgrade at a more convenient time and date. 

:-) 

On 09/23/2015 05:04 PM, Simon Lockhart wrote: 
> 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 