lots of prepends

Mikael Abrahamsson swmike at swm.pp.se
Thu Feb 19 15:20:48 CST 2009


Today 85.119.176.0/21 was announced by AS20912 with 177 prepends. I 
noticed 20912 modulo 256 is 176. AS47868 modulo 256 is 252 which matches 
this mondays prepend-incident.

So, what router OS will put 20912 into a byte and thus end up with 176 in 
something like "set as-path prepend last-as <no of prepends>" ? It needs 
to be fixed.

Has anyone noticed any ill effects with IOS and using "bgp max-as"? Will 
it just drop any prefixes with long as-paths and no other ill operational 
effects?

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se




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