Hi, > What should happen is this "quasi-legitimate" method of > multi-homing should just be declared illegitimate for IPv6, to > facilitate stricter filtering. Instead, what should happen is the > multi-homing should be required to fit into one of 3 scenarios, so > any announcement with an IPv6 prefix length other than the > RIR-allocated/assigned PA or PI block size can be treated as TE and > summarily discarded or prioritizes when table resources are scarce.
Splitting the allocation can be done for many reasons. There are known cases where one LIR operates multiple separate networks, each with a separate routing policy. They cannot get multiple allocations from the RIR and they cannot announce the whole allocation as a whole because of the separate routing policies (who are sometimes required legally, for example when an NREN has both a commercial and an educational network). Deaggregating to /48's is not a good idea, but giving an LIR a few bits (something like 3 or 4) to deaggregate makes sense. - Sander
