North American Network Operators Group
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Re: No one behind the wheel at WorldCom
- From: Vadim Antonov
- Date: Tue Jul 16 03:51:42 2002
On Mon, 15 Jul 2002, Pedro R Marques wrote:
> From a point of view of routing software the major challenge of
> handling a 256k prefix list is not actually applying it to the
> received prefixes. The most popular BGP implementations all, to my
> knowledge, have prefix filtering algorithms that are O(log2(N)) and
> which probably scale ok... while it would be not very hard to make
> this a O(4) algorithm that is probably not the issue.
Mmmm... There's also an issue of applying AS-path filters which are (in
cisco world) regular expressions. Although it is possible to compile
several REs together into a single FSM (lex is doing exactly that), I'm
not sure IOS and/or JunOS do that.
--vadim
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