North American Network Operators Group

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Re: Determine difference between 2 BGP feeds

  • From: Warren Kumari
  • Date: Tue Apr 18 16:34:21 2006

On Apr 18, 2006, at 1:19 PM, Mike Walter wrote:

Sounds to me like one of your providers is not feeding you the full
internet routing table.  Have you checked with them to see if they are
providing you that?
Sounds to me like a: you are only looking at best routes or b: one of the providers is sending you more specific customer routes (that they summarize before sending to non-customers).

Personally I would just slurp one set of routes into an array in perl and then delete them if they appear in the other set. Any left over in either set are unique....


Mike Walter
Systems Administrator

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Scott "Tuc" Ellentuch at T-B-O-H
Sent: Tuesday, April 18, 2006 4:13 PM
To: [email protected]
Subject: Determine difference between 2 BGP feeds


We receive a BGP feed from different providers on two
different routers. While one seems to be a reasonable amount
of feeds after reviewing the CIDR report, the other is anywhere
from 3K to 10K more routes.

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 can understand a handful of routes over what CIDR says,
but a minimum of 3K more?

Thanks, Tuc/TBOH

Some people are like Slinkies......Not really good for anything but they still bring a smile to your face when you push them down the stairs.