Multihoming - Resilience or Independence

> That's why filtering /20 only without re-aligning the holes in the block
> won't
> work. In the end /20 make the routing table looks pretty but they are
> black-holing
> lots of traffic.

Well, it won't. The proposal for filtering is to filter on assigment
boundary, and for swamp space filter on /24. Now, what will break is
people punching holes in their PA space for multihomed users. Funny
enough, this has never been discussed (to my knowledge) as a problem in
PTOMAIN WG of the IETF. There the argument was for traffic engineering and
commercial relationships...

> As we all agree that re-assign address is NOT practical at all thus just
> filtering
> /20 block is not a good solution.

That is not the suggestion. See above. The assignments per block and RIR
is well known.

Best regards,

- kurtis -