RE: Multihoming - Resilience or Independence
- Date: Tue, 16 Oct 2001 19:58:07 -0400
> > 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...
>
Even for PI and swamp space, if the organization divides their space among
different ISPs for
multi-homed links. You still got a problem.
> > 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.
Well known and lots of holes in it. That's the problem.
Ping Lu
Cable & Wireless USA
Network Tools and Analysis Group
W: +1-703-292-2359
E: plu@localhost
