[61161] in North American Network Operators' Group
bgp route-map
daemon@ATHENA.MIT.EDU (Haesu)
Mon Aug 25 14:40:23 2003
Date: Mon, 25 Aug 2003 14:39:59 -0400
From: Haesu <haesu@towardex.com>
To: nanog@merit.edu
Errors-To: owner-nanog-outgoing@merit.edu
Hi all,
Wondering if anyone would know whether such feature in IOS exists or not...
Most of the time, people use route-maps on bgp neighbors or peer-groups to set
an attribute,etc on a prefix that is being announced OUTbound or INbound.
However: On prefixes being announced to me INBOUND, is there a feature to set
in route-map so that it checks whether the advertised prefix is already existing
in local RIB?
Like for example, I am one of the users who receive bogon advertisements from
Rob's route-server.
Now, when I receive prefixes either from my upstream AS or my customers doing
bgp with me, I can setup a route-map on the neighbor so that it compares the
prefix being announced by neighborAS with existing Rob's bogon prefix in the RIB
with bogon route-server community 65333:888.
If the prefix being announced gets a match with existing prefix with 65333:888
already in the router, the route-map would cause a DENY. Thus, making Rob's
bogon announcement from his route-server, a bogon route filtering list for me
to use on my customers/peers..
If you are not understanding what I am saying, feel free to yell at me to clear
up..
This would make it much easier to create dynamic bgp-based route filtering list
in my opinion... I am not here to discuss the feasibility of whether doing or
inventing this dynamic method of filtering bgp routes; I am rather asking this
question to see if anyone is doing something similar to this as it may be useful.
Thanks!
-hc
--
Sincerely,
Haesu C.
TowardEX Technologies, Inc.
WWW: http://www.towardex.com
E-mail: haesu@towardex.com
Cell: (978) 394-2867
