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Re: Determine difference between 2 BGP feeds

  • From: Bill Nash
  • Date: Tue Apr 18 17:03:48 2006



Were I faced with this reporting equirement on an on-going basis, I'd suggest establishing a read-only BGP peer with both devices and comparing directly. I've got a perl BGP peering daemon that feeds and maintains a mirror of the BGP routing table into SQL, applying updates and withdrawals as they come in. Setting up something similar, and adding some additional metrics to keep entries unique by peer source would facilitate your end goal with simple SQL grouping mechanics.

- billn

On Tue, 18 Apr 2006, Marco d'Itri wrote:

On Apr 18, Scott Tuc Ellentuch at T-B-O-H <[email protected]> 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 have one, but it's cisco-specific:

http://www.bofh.it/~md/software/cisco-tools-0.2.tgz (the dumppeers script)

Then you can easily find the missing routes with commands like:

awk '{print $1}' < ../routes/1.2.3.4 | sort > ROUTER1
awk '{print $1}' < ../routes/1.2.3.5 | sort > ROUTER2
comm -23 ROUTER1 ROUTER2 > MISSING2

--
ciao,
Marco