[c-nsp] command that can display the dropped routes containing AS loops

[b.turnbow at twt.it]

Hi,

> On Mon, 2015-01-12 at 22:17 +0800, Song Li wrote:
> > I am curious about the AS loops in the AS-path. I think there should
> > be a very, very few received BGP routes that contain the local AS#.
> > But because such routes will be dropped and not installed in Loc-RIB,
> > I want to know if there is a command that can display the dropped
> > routes containing AS loops on cisco. Does anybody know?
> 
> If you have "soft-reconfiguration inbound" configured on the neighbor you
> could probably use:
> 
>   show ip bgp neighbor 192.0.2.10 received-routes | incl _64512_
> 
> where 65412 is you own AS. You would need soft-reconfiguration since it
> would otherwise not make it into the BGP table. Keep in mind the risks
> regarding memory when enabling it. And the above command might be
> rather slow since it has to process the whole table as text.
> 
> I don't know of any other way though.

Or you could accept them in  with allow as in /accept own  being very very careful not to create havoc on your network... :-)

Try and see about debugging bgp , be careful about resources ,   I seem to remember  that debugging  bgp events having an error message being logged when own as is found in updates.


Brian