North American Network Operators Group

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Re: filtering long prefixes

  • From: Geert Jan de Groot
  • Date: Thu Sep 21 06:00:39 1995

On Thu, 21 Sep 1995 05:27:36 -0400  Sean Doran wrote:
> 	reject BGP announcements which:
> 	-- are an old-style classful B network with a 
> 	   mask longer than 16 bits

We have assigned 'chunks' of old-style B's in cases where
it made a significant difference (obsolete equipment).
Again, I see no technical reason  not to do this;
as far as your routers are concerned, there is not difference
between and

Geert Jan
(trying not to get into the discussion of the validity of
prefix length filtering again)