From: Biondino, Joseph (joseph.biondino@au.unisys.com)
Date: Wed Jun 11 2003 - 22:33:34 GMT-3
Kevin, thanks for your response, but unfortunately that would not help my
situation.
The routes originate in sub as 35078 (AS200), the router that needs to
filter the routes to its external neighbour is in sub as 65256 (AS200). All
AS 200 routers need to learn the route. This router has multiple external
neighbours and it has to advertise the routes to each of them, except one in
particular.
Setting the Local AS community - while preventing the route from appearing
in the hosts bgp table, which is the final goal, it also prevents the route
from appearing in other routers BGP tables which should not occur.
Kind regards,
Joseph Biondino
Network Specialist
UNISYS
Network Command Centre
115 - 117 Wicks Rd
North Ryde NSW 2113
Phone: 02 9857 3149
Group: 02 9390 1107
Fax: 02 9857 3122
-----Original Message-----
From: Kevin Tang [mailto:Kevin.Tang@telecom.co.nz]
Sent: Thursday, 12 June 2003 11:18 AM
To: Biondino, Joseph
Subject: RE: BGP AS-Path filtering
try this well-known communities:
local-as
Do not advertise this route to peers outside the local autonomous system.
This route will not be advertised to other autonomous systems or
sub-autonomous systems when confederations are configured.
Kevin
-----Original Message-----
From: Biondino, Joseph [mailto:joseph.biondino@au.unisys.com]
Sent: Thursday, 12 June 2003 11:39
To: ccielab@groupstudy.com
Subject: BGP AS-Path filtering
Hi there;
Last night I was doing a BGP practice LAB where by one of the requirements
was to filter routes advertised to an external neighbour that didn't
originate in the local AS (AS200).
An easy request it would seem, but the problem was that I was running
confederations thus the ip as-path access-list reg exp of ^$ for local
routes wouldn't work as in the BGP table of the advertising router the as
path of routes in the same AS but different sub-AS was (65078) ?
Is there a way to filter out these routes??
Kind regards,
Joseph Biondino
Network Specialist
UNISYS
Network Command Centre
115 - 117 Wicks Rd
North Ryde NSW 2113
Phone: 02 9857 3149
Group: 02 9390 1107
Fax: 02 9857 3122
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