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Routing policy question.
RFC 2772 says that you can only to your upstreams your fully aggregated
prefix, but it doesn't tells what to advertise to your downstreams.
(From 4. :)
All 6bone pTLAs MUST NOT advertise prefixes longer than a given pTLA
delegation (currently /24 or /28) to other 6bone pTLAs unless special
peering arrangements are implemented.
("to other 6bone pTLAs" does imply that this is not a requeriment when
talking to a downstream?)
Horacio J. Peña