If this 500K routes come from upstream, it is just _default_ so can be installed instantly if configuration is correct. If this 500K routes are from the peer, you switch (in reality) 10 - 20%, so it is simpler anyway. Even if it is multihome customer, there is not any need in _fast_ installation for these 500K routes. You just switch from one provider to another _some_ of the routes - if it takes 1 minute, nothing wrong happen. Then, calculate: 500K routes, say 32 bytes/route (if not compressed by some way), 16MB. T1 link, 100K/second, 160 seconds, 3 minutes. 100Mbit link, 10MB/second, 2 seconds. T1 wil not be suitable for full routing of course, so what? Just agaion - there are many tricks todo things right, out of theoretics of IPv6 commitees. ----- Original Message ----- From: "Blaine Christian" <blaine@blaines.net> To: "Lincoln Dale" <ltd@interlink.com.au> Cc: "Alexei Roudnev" <alex@relcom.net>; <nanog@nanog.org>; "Daniel Senie" <dts@senie.com> Sent: Wednesday, October 26, 2005 6:06 PM Subject: Re: Scalability issues in the Internet routing system
there have been public demonstrations of released routers supporting upwards of 1.5M IPv4+IPv6 prefixes and demonstrations on routing churn convergence time. <http://www.lightreading.com/ document.asp?doc_id=63606> contains one such public test.
The http://www.lightreading.com/document.asp? site=testing&doc_id=63606&page_number=6 part may be a bit misleading. For me it would be more interesting to see what happens when 500k routes completely disappear from the router then come back. I want to see a 500k route push from a neighboring CRS in that amount of time...
Of course the routes can switch quick when you use a layer of indirection (folks have been doing that for a few years now). My question is how fast can you install routes from a standing start (or a 1/4 of a standing start if this is 2M prefixes).
I will leave the question on whether it is actually worth an investment in time and resources as an exercise for the reader <grin>.
Lightreading people, test it like that! It will be much more entertaining and perhaps even a bit enlightening to see how major vendors compare on "brand new" route installation into RIB and FIB. They only have to twiddle a couple bits to make indirection work quickly. Having to deal with a brand new prefix is a completely different problem.