Peering Policies and Route Servers

one thing that's been overlooked in this conversation is the fact that
routing in the internet between mci/sprint/etc... nsp's is asymmetric.
we route shortest exit to sprint, they route shortest exit to us. in
this way we share the cost of cross country transit. unless you're in
three naps across the country (east, west, and middle) that's kind of
hard to duplicate.

Jeff Young