Route table growth and hardware to the filter

Stephen Sprunk stephen at
Mon Sep 10 15:16:17 UTC 2007

Thus spake "Jon Lewis" <jlewis at>
> The trouble is, it turns out there are a number of networks where
> CIDR isn't spoken.  They get their IP space from their RIR, break
> it up into /24s, and announce those /24s (the ones they're using
> anyway) into BGP as /24s with no covering CIDR.

IMHO, such networks are broken and they should be filtered.  If people doing 
this found themselves unable to reach the significant fraction of the Net 
(or certain key sites), they would add the covering route even if they were 
hoping people would accept their incompetent/TE /24s.


Stephen Sprunk         "God does not play dice."  --Albert Einstein
CCIE #3723         "God is an inveterate gambler, and He throws the
K5SSS        dice at every possible opportunity." --Stephen Hawking 

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