Determine difference between 2 BGP feeds

[Scott "Tuc" Ellentuch at T-B-O-H <ml () t-b-o-h net>]

Hi,

        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