> In order to send a plausible route to the rest of the Internet, AS2
> must advertise both the aggregate 96.0.0.0/14 and the more-specific
> 96.0.0.0/22. AS3 must also advertise 96.0.0.0/22. So, AS2, for
> legitimate reasons, is sending less-than-optimally-aggregated
> announcements.
This of course is the obvious answer to the question. Another part would
be that AS1 should be able to advertise that space any way it would like
to, like with prepends for instance. If AS2 aggregated anyway, not only
would they not recieve any traffic, but they would create an atomic
aggregate that looses the intended information announced by AS1. When this
was first written I didn't respond though because I actually checked some
route servers (for the first set of addresses anyway) and the ASPATH
indicated they were not multihomed and that the provider owned the entire
class B. So I really couldn't think of a good reason to announce more
specific space without multihoming.
andy
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