as path filtering -- cisco implementation
Is inbound as-path filtering an efficient way of preventing routes from entering your bgp table? How come the filtered routes still show up in the bgp table and not in the routing table? What is hit on the CPU? __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! http://promotions.yahoo.com/new_mail
Is inbound as-path filtering an efficient way of preventing routes from entering your bgp table? How come the filtered routes still show up in the bgp table and not in the routing table? What is hit on the CPU?
AFAIK, it shouldn't show up on bgp table if you are filtering inbound to you. Do a sh ip bgp a.b.c.d/affectedaddr please. Remember that Cisco's bgp implementation is scan-based, so it takes a bit of time for policy changes to kick in. Try doing 'clear ip bgp w.x.y.z in' in an attempt to speed it up. -J -- James Jun TowardEX Technologies, Inc. Technical Lead Network Design, Consulting, IT Outsourcing james@towardex.com Boston-based Colocation & Bandwidth Services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
Do you have 'soft-reconfiguration inbound' on ? If so it will hit the BGP table but will be marked as received-only. This allows for re-scanning of the table in order to effect filter and other changes without a hard reset of the session.
Is inbound as-path filtering an efficient way of preventing routes from entering your bgp table? How come the filtered routes still show up in the bgp table and not in the routing table? What is hit on the CPU?
-- Stephen Baxter PIPE Networks: Peering,IX points and dark fiber in Australia Largest peering network downunder phone : 07 3233 9800/ 0417 818 695 fax : 07 3220 1800 web : www.pipenetworks.com ______________________________________ PIPE Networks/IX Services Australia disclaimer The above email should be read in conjunction with our standard disclaimer/terms which can be found at : http://www.pipenetworks.com/docs/disclaimer.htm
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Steve Baxter