North American Network Operators Group

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Re: Scalability issues in the Internet routing system

  • From: Blaine Christian
  • Date: Wed Oct 26 21:07:51 2005

there have been public demonstrations of released routers supporting upwards of 1.5M IPv4+IPv6 prefixes and demonstrations on routing churn convergence time. < document.asp?doc_id=63606> contains one such public test.

The 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.