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Re: [sbrim@cisco.com: Re: [RRG] Thoughts on the RRG/Routing Space Problem]



Scott,

On 2007-12-04 14:06, Scott Brim wrote:
Excerpts from Brian E Carpenter on Tue, Dec 04, 2007 08:26:52AM +1300:
On 2007-12-04 06:09, Scott Brim wrote:
So it's let's-have-fun-with-rhetoric day, eh?  We got here because of
the rate*state problems, of which PI allocations are a small part.
Once we got here, we discovered that we potentially had the freedom to
abandon the dogma that you are clinging to.  (At this point I believe
you're supposed to say "I find your lack of faith disturbing").
Oh, I do, certainly ;-)

However, my point was not intended as rhetoric. The reason we designed
IPv6 for multiple prefixes per site was precisely to avoid the problem
that IPv4 faced pre-CIDR. The emergence of PI allocations and BGP4-based
multihoming for a large number of IPv6 sites would recreate that problem.
It hasn't happened yet because we don't *have* a large number of IPv6
sites yet. But if we can't get people used to the idea of multiple
prefixes per site, we *will* have the problem, and I thought that
was the main reason we're here - to keep the number of prefixes that
the core has to route down to a manageable number, even if sites
stick to the old notion of one prefix per site.

Yes but we don't need to push provider-allocation to do so if we have
a map&encap mechanism in place.  I don't know what the future
allocation mechanism will be -- it could be provider-based, and for
many sites that will work best  -- but it need not be.  My concern was
that you seemed to be saying that we had to stay with PA.

I think that if we *don't* solve the problem we're discussing
here, the facts of physics will force us to impose the PA model.
I've thought that ever since RFC 3177, in fact.

    Brian

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