If the "local-as" feature is what you're looking for, this might help you get started:
http://wiki.nil.com/Network_migration_or_merger_with_BGP_Local-AS_feature Unfortunately I haven't covered the "replace-as" functionality yet, but Arden has written a short article a while ago that covers it: http://ardenpackeer.com/routing-protocols/bgp-allowas-in-bgp-local-as-tips-a nd-tricks/ Best regards Ivan http://www.ioshints.info/about http://blog.ioshints.info/ > -----Original Message----- > From: Peter Rathlev [mailto:[email protected]] > Sent: Thursday, May 07, 2009 9:08 AM > To: Rocker Feller > Cc: [email protected] > Subject: Re: [c-nsp] Multiple BGP sessions on one router. > > On Thu, 2009-05-07 at 08:22 +0300, Rocker Feller wrote: > > I have been working with BGP for a few months now and am > trying to get > > a grasp of it. > > > > I have an assignment that requires to have multiple bgp sessions > > running on a single router and the prefixes advertised from each > > prefix appearing so. > > > > Does this make sense? Am a bit foggy on this and would > appreciate any > > direction advise on how this can be achieved. > > > > What do I want to achieve? > > In short I want to consolidate to AS numbers in to one. > > AFAIK you can't have two BGP instances on one Cisco device. > You can do something else though, namely use "local-as" on > your neighbor session. > This would present your router as belonging to another AS. > > +--------+ +--------+ > | AS 100 |----------| AS 200 | > +--------+ +--------+ > > If you're on the left, paths from you would normally look > like e.g. "100 i" to the ASBR in AS 200. If you configure > "local-as 300" he would instead see "300 100 i", as if you > stuck the other AS in between you. > >From your side his paths would look like "300 200 i". > > > Which options do I have to achieve this and with minimal > disruptions > > to my customers? > > Changing local-as requires the session to be reset to take effect. > > Regards, > Peter > > > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
