[c-nsp] BGP Private-AS removal

[Simon Allard]

That only works if the private AS is originating the routes. Since the Private AS's are actually in the middle of the path that command will do nothing.

I have been struck by this issue in the past, and the only way I could resolve it was to change my private AS's to publics, or originate the customers routes.

I got some nasty emails from people telling me I was leaking private AS's into the global bgp table. Not fun!

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Robert Crowe (rocrowe)
Sent: Wednesday, 15 June 2011 2:15 a.m.
To: techtalm at gmail.com; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] BGP Private-AS removal

http://www.cisco.com/en/US/docs/ios/iproute_bgp/configuration/guide/irg_
remove_as_ps10592_TSD_Products_Configuration_Guide_Chapter.html

neighbor {ip-address | peer-group-name} remove-private-as [all [replace-as]]

Robert Crowe
Email: rocrowe at cisco.com

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of techtalm at gmail.com
Sent: Tuesday, June 14, 2011 12:35 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] BGP Private-AS removal

Hi,



I have a situation as follows:

C1 --- P1 --- P2 --- P3 --- ISP1 --- ISP2



All routers have eBGP peer relationship were C1 holds public AS, P1 to
P3
holds private AS (each) and ISP1 is my edge router with my public AS.

Configuring remove-private-as on ISP1 wouldn't remove the private-as as it will see it a configuration error due to public-private-public sequence.

Is there any other way to remove the private AS and preserve the AS-Path with only public?



Best Regards,

Techtalm





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