Hello Nick, Thanks for your reply, i am totally agree with you.
Regards, Ahmed On Tue, Apr 16, 2013 at 9:12 PM, Nick Hilliard <[email protected]> wrote: > On 15/04/2013 21:44, Ahmed Hilmy wrote: > > I am using Prefix-list and as-path for BGP filter. > > But if i apply Prefix-list as inbound filter at PE, then from PE to RR ( > > Route Reflector ) i apply as-path filter, i think it is more scalable > than > > modify Prefix-list continuously ? or use community ? > > If my question not clear please ask me. > > it depends. > > Prefix lists are very fast because they are implemented as a trie, and it > is very fast to look up an entry in a trie. > > Community lists can be fast (standard, i.e. integer comparison) or slow > (extended, i.e. regular expression). > > as-path lists are slow because they use regular expressions. > > If you need to filter BGP updates, it is usually fastest to use prefix > lists or standard community lists. It makes little difference whether you > use extended communities or as-path lists - both are slow. > > Nick > > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
