North American Network Operators Group

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Re: number of unaggregated class C's in swamp?

  • From: Yakov Rekhter
  • Date: Sat Sep 30 22:57:33 1995


> I like the idea of measuring each and every class-A-sized block
> against some standard separately, since a lot of the class-C space has
> been allocated to regional registries this way and it inconveniences
> those places which have done the best the least.  I'm less attached to
> the number 1200 in particular, but I do think an explicit target should
> be chosen which represents both a tractable limit to design big routers for
> and which allows the implementation of efficient address allocation strategie
> which won't have to be tighened over time.  I do note that 1200 is
> close to the threatened /18 address filter, but this is mostly accidental.
> I'd much rather see each space filled with /14's and /20's, and even
> an occasional /23 or /25, as appropriate and as long as the filled block
> was only 1200 (or N, for some well-defined N) routes, rather than
> picking an arbitrary, one-size-fits-all filter limit.  The latter is
> a sign of failure.

So, perhaps we should just look at the total amount of IP address space
advertised by a provider in its routing advertisements, then divide 
this amount by the number of routes the provider advertises, and 
see whether the resulting number meets the goal.