Router peer access-list creating scripts

[Wookie <wookie () world std com>]

Hi,

Does anyone know of any scripts which will help us keep the filters on our
peering routers (Ciscos) up to date, so we only allow them to announce
those routes to us that they have registered with one of the routing
registries? 

Keeping these filter up to date manually is a pain, particularly where a
peer announces several customer AS numbers to us. 

We'd rather filter than just leave ourselves open to our peers annoucing
any old garbage to us.

What does everyone else do?

Wookie