[151010] in North American Network Operators' Group
Re: filtering /48 is going to be necessary
daemon@ATHENA.MIT.EDU (Sander Steffann)
Fri Mar 9 18:33:54 2012
From: Sander Steffann <sander@steffann.nl>
In-Reply-To: <CAAAwwbW9vxxB1rgn6YthkvJ_rL3kF_y4frEdbOzbbrp-L+oi7g@mail.gmail.com>
Date: Sat, 10 Mar 2012 00:32:59 +0100
To: Jimmy Hess <mysidia@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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
