filtering out reserved AS numbers

[Rob Liebschutz <rob () rjl com>]

I just noticed in the route server statistics web pages, that ANS is
passing along a route to a network in AS 64512, somewhere in Mexico,
which we are in turn also passing to our clients.

I thought about filtering these AS numbers, but decided that it gets
too costly to filter reserved AS numbers that might appear in
arbitrary places in the ASPATH.

Rob

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