[90015] in North American Network Operators' Group
Re: Determine difference between 2 BGP feeds
daemon@ATHENA.MIT.EDU (John Kristoff)
Tue Apr 18 16:36:34 2006
Date: Tue, 18 Apr 2006 15:36:07 -0500
From: John Kristoff <jtk@ultradns.net>
To: nanog@merit.edu
In-Reply-To: <200604182013.k3IKDC7H044130@himinbjorg.tucs-beachin-obx-house.com>
Errors-To: owner-nanog@merit.edu
On Tue, 18 Apr 2006 16:13:12 -0400 (EDT)
Scott "Tuc" Ellentuch at T-B-O-H <ml@t-b-o-h.net> wrote:
> Is there a utility that I can use that will pull the
> routes off each router (Foundry preferred), and then compare
> them as best it can to see why there is such a difference?
I don't know anything about foundry, but if you can simply display
the routing table from a terminal, you can go the hacky unix cli
tool way. For example, use 'script' to log your terminal session
to a file, then presuming you can show the route table and each
route includes a 'via upstream-address-line' line for each route
(completely untested and I'm sure someone could come up with
something much simpler and better):
grep 'via upstream?' script > upstream?
perl -ne 'print "$1\n" if /(\d{1,3}(?:\.\d{1,3}){3}\/\d{1,3})/' upstream? |
sort > upstream?.sored
comm -23 upstream1.txt upstream2.txt
comm -13 upstream1.txt upstream2.txt
John
