North American Network Operators Group
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Re: weird BGP cisco-ism? [problem resolved]

  • From: Dorian R. Kim
  • Date: Fri Jul 11 18:54:23 1997 
On Fri, 11 Jul 1997, Matthew Kaufman wrote:

>  We peer with that provider directly, and can also see them via our transit
> provider, and we have "summary-only" set in our BGP configuration. Every

I'd suggest moving away from "summary-only" aggregation. If you are a transit
network, and have customers who are multihomed numbered out of your CIDR
block, then you'd need to do aggregation without "summary-only" anyway, so
it's a good thing to move towards even in general case if you are a transit
network.

You can remove the specifics at the edges of your network either via community
based filtering or prefix based filtering. The former is much more flexible
and is the one I'd recommend.

-dorian