No one behind the wheel at WorldCom

Tue Jul 16 07:48:36 UTC 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