North American Network Operators Group

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Re: Scalability issues in the Internet routing system

  • From: Tony Li
  • Date: Mon Oct 24 20:30:15 2005

On Oct 23, 2005, at 11:33 PM, Alexei Roudnev wrote:

One question - which percent of routing table of any particular router is
REALLY used, say, during 1 week?

I have a strong impression, that answer wil not be more than 20% even in
biggerst backbones, and
will be (more likely) below 1% in the rest of the world. Which makes a hige
space for optimization.

As of the last time that I looked at it (admittedly quite awhile ago), something like 80% of the forwarding table had at least one hit per minute. This may well have changed given the number of traffic engineering prefixes that are circulating.