North American Network Operators Group

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Re: Scalability issues in the Internet routing system

  • From: Andre Oppermann
  • Date: Wed Oct 19 06:44:41 2005

Elmar K. Bins wrote:

Using the compression ("cooking") per router can provide one level of
abstraction [reduction of prefix space] at router.  So cooking down your
Large number of routes to a "minimum" set of routes can provide some
leverage against the prefix growth.
By cooking down the prefixes you unfortunately lose topology information
which might be a bad thing, and at the same moment disrespect the site's
wish to how it would like to be routed. Another bad thing, if you think
of companies/sites paying for the entire network in the long run.
Cooking prefixes was only meant to be done within the router between
the control plane and the (hardware) FIB or forwarding engine.  This
ain't prefix aggregation within the BGP system.

Apart from that, IMHO cooking down the prefixes only buys time, but does
not solve the problem. More people will multihome, and with the current
mechanisms and routing cloud, they have to do it by injecting prefixes.
And this won't change in future.

I'm not sure whether this hasn't long become an architectural question
and should be moved to the (new) IETF arch list. Opinions?


PS: Btw, anyone can give me a hint on where to discuss new ideas for
    e.g. routing schemes (and finding out whether it's an old idea)?
With pretty high certainy one can say that it is an old idea with some
minor twist or wording change.