Re: route filtering in large networks

[Randy Bush <randy () psg com>]

> Verio has a history of being a prefix length nazi, but were they
> that way about route validity?

i can only speak in the quite past tense.  but yes.  due to
limitations of routers (ever try a really long acl on a cisco?)
and some large peers not registering, verio could not filter
large peers inbound.

> Plenty of networks are stringent on what they accept from their
> customers, but are they as stringent with the routes they send?

if stringent == careful, they <bleep>ing well should be.  this does
not imply that their inbound business policy must be the same as
their outbound, e.g. customers pay to have their routes announced
no matter how silly.  one's peers are not obliged to listen to them.

randy