From: Foster, Kristopher (KFoster@xxxxxxxxxxxxxxxxxxxx)
Date: Wed Oct 18 2000 - 10:44:13 GMT-3
Ack, could have sworn it was in there, turns out I was picturin a diagram in
the ABGP coursenotes from Global Knowledge. Here's how it applies the
various filters:
For routes coming in:
1st. Distribute list in
2nd. filter-list in
3rd. default weight
4th. filter-list weight
5th. route-map in
For routes going out:
1st. route-map out
2nd. filter-list out
3rd. Distribute list out
Hope this helps :)
Kris,
-----Original Message-----
From: Jack Heney [mailto:jheneyccie@hotmail.com]
Sent: Tuesday, October 17, 2000 6:45 PM
To: KFoster@C1Communications.com; ccielab@groupstudy.com
Subject: RE: BGP filtering
I just tore my copy of Halabi apart (not literally, that happens after I
pass) and I can't seem to find the diagram you are talking about...Could you
(or anyone else if they know where it is) give me an idea where to look?
Thanks...Jack
>From: "Foster, Kristopher" <KFoster@C1Communications.com>
>Reply-To: "Foster, Kristopher" <KFoster@C1Communications.com>
>To: "'Jack Heney'" <jheneyccie@hotmail.com>, ccielab@groupstudy.com
>Subject: RE: BGP filtering
>Date: Tue, 17 Oct 2000 16:00:06 -0400
>
>Jack,
>Really wish I had my copy of Halabi with me. Somewhere in there he has a
>really excellent diagram detailing the order in which
>filters/route-maps/etc
>are applied. Basically, yes you can do this, but like in math, watch your
>order of operations. Flip around in there, you'll find it :)
>
>Kris,
>
>-----Original Message-----
>From: Jack Heney [mailto:jheneyccie@hotmail.com]
>Sent: Tuesday, October 17, 2000 3:17 PM
>To: ccielab@groupstudy.com
>Subject: BGP filtering
>
>
>Halabi, pg. 317:
>
>Router bgp 1
>neighbor INTERNALMAP peer-group
>neighbor INTERNALMAP remote-as 1
>neighbor INTERNALMAP route-map INTERNAL out
>neighbor INTERNALMAP filter-list 1 out
>neighbor INTERNALMAP filter-list 2 in
>neighbor 172.16.11.1 peer-group INTERNALMAP
>neighbor 172.16.13.1 peer-group INTERNALMAP
>
>My question is this...I had always assumed that you couldn't use both an
>outbound filter and an outbound route-map to the same neighbor...I based
>that assumption on the fact that the route-map itself could act as a
>filter...According to Halabi, however, this is an acceptable configuration,
>so which logic is processed first? What if I incorporate an AS-path filter
>in an outbound route-map that explicitly permits traffic that was
>explicitly
>
>denied by the AS-path list referenced in the filter-list command?
>Thanks in advance for any help,
>Jack
>
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:25:27 GMT-3