kooky BGP tricks

["E.B. Dreger" <eddy+public+spam () noc everquick net>]

Greetings all,


Time for the "kooky routing idea of the year" post...


Scenario:

AS65000 is a bandwidth provider.  One of their downstreams wishes
to peer with AS65100, or to multihome with AS65100 as a second
upstream.  The obvious and 100% correct answer is for $downstream
to register their own ASN, that anyone ready to multihome or peer
can afford $500 up front and a few bucks per year.  We all know
this.

However, $downstream wishes to advertise the routes without
registering an ASN.  AS65100 decides to advertise $downstream's
prefixes as

        65100 65000 ?

exactly as if 65000 were sending only $downstream's routes to
65100.  From a technical perspective, this works.  Yes, there are
issues with more-specifics and perhaps loop detection.


The question:

What would your reaction be if you were AS65000?  Note that this
is a political/admin question, _not_ a technical one.


My thoughts: