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

[Darren O'Connor]

Yes there is, and it was already posted:show ip bgp neighbor 192.0.2.10 received-routes | incl _64512_
> Date: Tue, 13 Jan 2015 09:48:49 +0800
> From: refresh.lsong at gmail.com
> To: b.turnbow at twt.it; peter at rathlev.dk
> CC: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] command that can display the dropped routes containing AS loops
> 
> Hi,
> 
> Thanks!
> 
> on juniper router, I know a command can do that:
> 
> show route hidden aspath-regex .*<Target-AS>.*
> 
> It seems that there is no similar command on a cisco router.
> 
> Song
> 
> 在 2015/1/13 1:30, b.turnbow at twt.it 写道:
> > 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
> >
> >
> >
> >
> 
> 
> -- 
> Song Li
> Room 4-204, FIT Building,
> Network Security,
> Department of Electronic Engineering,
> Tsinghua University, Beijing 100084, China
> Tel:( +86) 010-62446440
> E-mail: refresh.lsong at gmail.com
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