mailing list archives
Re: a radical proposal (Re: protocols that don't meet the need...)
From: "Edward B. DREGER" <eddy+public+spam () noc everquick net>
Date: Wed, 15 Feb 2006 20:56:01 +0000 (GMT)
AO> Date: Wed, 15 Feb 2006 21:41:53 +0100
AO> From: Andre Oppermann
AO> Err, the problem is not the number of AS numbers (other than having to
AO> move to 32bit ones). The 'problem' is the number of prefixes in the
AO> routing system. The control plane scales rather well and directly
AO> benefits from Moore's law. With todays CPU's there is no problem
AO> handling 2 million routes and AS numbers. Absolutely not.
For some equipment. However, I encounter a number of 7200s still in
AO> Things get a bit more hairy with the forwarding plane though. The
AO> faster the link speed the less time it has per lookup and the larger
AO> the routing table the more routes it has to search in that ever shrinking
AO> amount of time.
AO> You see, saving on AS numbers is not really going to help much where it
It's also saving on route count. In my example, Cox and SBC partner up
and share an ASN and a netblock. That's _one_ global route for a ton of
AO> IMHO, and I have stated this before, the best way to handle the route
AO> issue is to hand out IPv6 /32 for multihoming and make it the routeable
AO> entity. Perfect matches in hardware are pretty easy to do for large
AO> numbers of them compared to longest match. On the plus side perfect
AO> match scales much better too and can be done in parallel or distributed
AO> within a routing chip. Doing the same for longest-match requires a lot
AO> more effort. With perfect-match having 2 million routes is not much of
AO> a problem too.
All true. But can we wait for all the forklifts?
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