Steve, If it is optimal routing that your after, I would think that you could still have your some of your internal 3600's or 2600's run BGP with your 2 gateway routers, but just don't send the full internet routing table to them. For instance, you could possibly put up as-path filters to allow only your local ISP's and their respective customer's routes to be passed to your internal routers that sit immediately behind your 2 gateway routers. That way your outbound traffic will have at least some routing information to make a decision. While this setup is not as optimal as having a full internet routing table, I would think this would allow for more optimal routing then just using defaults. I have customers at my work with 3600's with appropriate amount of memory that are multihomed handling 30,000+ routes from each provider comfortably.
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