[6025] in North American Network Operators' Group
Re: BGP Configuration Problem
daemon@ATHENA.MIT.EDU (Rob Liebschutz)
Fri Nov 8 11:24:56 1996
Date: Fri, 8 Nov 96 8:17:51 PST
From: Rob Liebschutz <rob@rjl.com>
To: Avi Freedman <freedman@netaxs.com>
Cc: lambert@psc.edu (Michael H. Lambert), nanog@merit.edu,
lambert@ebola.psc.edu
In-Reply-To: Your message of Fri, 8 Nov 1996 08:49:53 -0500 (EST)
> > We are having a BGP configuration problem which looks trivial but is not
> > working the way we expect. I'm going to throw myself on the mercy of
> > the court and ask for help.
> >
> > There are three routers A, B and C. These are in ASa, ASb and ASc,
> > respectively. B imports 10.1.64/19 from A and 10.1/16 from C. What
> > we were expecting was for B's route to the /19 to be via A, just because
> > this is the more specific route. However, the only route (both in the
> > BGP and routing tables on B) is for the entire /16 via C.
>
> Even if it isn't the best route, you should see the table of choices
> (in a Crisco) if you do 'sho ip bgp x.y.z.0'. You'll only see the most
> specific choices that match with that - you could also do a 'sho ip bgp' and
> watch (presumably 10/8 should be near the top) for 10.1.64.0's range to show up
> and see what choices are presented.
How about:
show ip bgp 10.1.0.0 255.255.0.0 longer-prefixes
