George, On Thu, May 12, 2011 at 11:41 AM, George Bonser <gbonser@seven.com> wrote:
A lot. I see /48 breakouts from /32 PA blocks for instance, announced by a customer AS of the PA holder AS.
-- Mikael Abrahamsson email: swmike@swm.pp.se
Which is kinda sad.
It's reality.
If those customer AS are multihomed or plan to be multihomed, they can get their own allocation out of PI space. If they are not multihomed outside of the provider AS, there is no need for the provider to "leak" that /48 out of their AS to their peers.
In the RIPE region, being multihomed or planning to be it is not a sufficient condition for getting a PI prefix. And even if it was, the hit on DFZ is the same as from getting allocation from LIR. Even if they get their own /32, the hit would be the same (modulo individual FIB/RIB implementations). Consequently, there's work in progress to modernize RIPE IPv6 address policy. http://ripe62.ripe.net/presentations/148-wg.pdf p. 19 and forward. Cheers, Martin