From: Richard Dumoulin (Richard.Dumoulin@vanco.fr)
Date: Fri Sep 02 2005 - 04:29:54 GMT-3
Although this FAQ comes from Cisco, I believe the order has changed and the
route-map is always applied last in the latest IOS versions. Anyone can
confirm? This is explained in the Cisco ISP book but I do not have it in
hand to check,
-- Richard
-----Message d'origine-----
De : Richard Dumoulin
Envoyi : vendredi 2 septembre 2005 09:21
@ : 'ccie2004'; ccielab@groupstudy.com
Objet : RE : Route Filtering order of operation
Q. What is the order of preference of attributes when some or all are
applied to one neighbor in BGP?
A. The order of preference varies based on whether the attributes are
applied for inbound updates or outbound updates.
For inbound updates the order of preference is:
route-map
filter-list
prefix-list, distribute-list
For outbound updates the order of preference is:
prefix-list, distribute-list
filter-list
route-map
Note: The attributes prefix-list and distribute-list are mutually exclusive,
and only one command (neighbor prefix-list or neighbor distribute-list) can
be applied to each inbound or outbound direction for a particular neighbor.
Extracted from
http://www.cisco.com/en/US/customer/tech/tk365/technologies_q_and_a_item0918
6a00800949e8.shtml#one
-- Richard
-----Message d'origine-----
De : ccie2004 [mailto:ccie2004@excite.com]
Envoyi : vendredi 2 septembre 2005 00:41
@ : ccielab@groupstudy.com
Objet : Route Filtering order of operation
Hi All, I need some help understanding what the order of operation is for
route-filtering. Referring to using prefix-lists, route-maps on the same
interface applied to the same neighbor outbound and inbound. So say I have a
prefix list Test 1 applied to neighbor x.x.x.x outbound & than I
have a route-map applied to the neighbor which refers to another prefix-list
Test 2 than what order would it follow. Also if there is no route-map permit
at the end than will it deny all the routes. I tried this on a couple of
2500's and it seemed that it applied the prefix-list Test 1 and than the
route-map but both of them needed an explicit permit at the end to work.
Another question was that I just noticed that when I set a community or
metric value in the route-map I don't see it on the show ip bgp ne
advertised out option. I have to go to the other router to confirm this. Is
this code dependant? Thanks for your
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