From: Ouellette, Tim (tim.ouellette@xxxxxxx)
Date: Sun Mar 24 2002 - 03:15:28 GMT-3
Just as I though, it looks as if once I match is met, that's it. If no
match is met then it continues on until there is no more (implicit deny)
excerpt from the link
When BGP applies MYMAP to routing updates, it applies the lowest instance
first (in this case, instance 10). If the first set of conditions is not
met, the second instance is applied, and so on, until either a set of
conditions has been met, or there are no more sets of conditions to apply.
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm#xtocid20439
8
-----Original Message-----
From: Ouellette, Tim
Sent: Sunday, March 24, 2002 1:10 AM
To: 'Ahmed Mamoor Amimi'; Carl Phelan; Ouellette, Tim
Cc: ccielab@groupstudy.com
Subject: RE: BGP - Transit Area and now Route-Maps
Ahmed,
I believe that you need to watch the order. Obviously in an ACL once you
match a list than that action is performed (deny/permit) but I believe that
a route-map would be the same. So in your example, all routes incoming will
match your sequence #10, since you have no match statement means match all,
then you'll set the no-export and that's it. I don't think it'll go onto the
next instance. I'll have to read up but i think that's the way it works. I
think what you might want to do is like this.
route-map comm&metric permit 10
match ip add x
set community no-export
set metric 200
route-map comm&metric permit 20
set metric 200
router bgp 99
neighbor x.x.x.x route-map comm&metric out
-----Original Message-----
From: Ahmed Mamoor Amimi [mailto:mamoor@ieee.org]
Sent: Sunday, March 24, 2002 12:59 AM
To: Carl Phelan; 'Ouellette, Tim'
Cc: ccielab@groupstudy.com
Subject: Re: BGP - Transit Area and now Route-Maps
Can u try this one.
This will put the community "no-export" to every route
R1
router-map comm&metric-set permit 10
set community no-export
router-map comm&metric-set permit 20
match ip add x
set metric 200
router-map comm&metric-set permit 30
set metric 200
Router bgp 99
....
Neighbor 10.1.1.1 route-map comm&metric-set out
let me know what is the result
-Mamoor
----- Original Message -----
From: Carl Phelan <carlphelan@hotmail.com>
To: 'Ouellette, Tim' <tim.ouellette@eds.com>
Cc: <ccielab@groupstudy.com>
Sent: Sunday, March 24, 2002 6:36 AM
Subject: RE: BGP - Transit Area and now Route-Maps
> Thanks Tim for the reply. I have a weird problem with BGP. I cannot
> seem to create 2 neighbor statements with route-maps as when I enter the
> second neighbor statement; the first disappears from the config.
>
> Here is my set up:
>
> R1
> Route-map set-comm perm 10
> Set community no-export
>
> Route-map metric-set perm 10
> Match ip ad x
> Set metric 200
> ..
> Route-map metric-set perm 20
> Set metric 300
> ..
> Router bgp 99
> ....
> Neighbor 10.1.1.1 route-map set-comm out
> Neighbor 10.1.1.1 route-map metric-set out
>
> But when I look at the config only the last neighbor statement remains,
> if I add the missing neighbor statement again; the existing neighbor
> statement disappears! The same problem happens on another router but
> has the additional neighbor statement:
>
> Neighbor 11.1.1.1 route-map set-weight in
> ..
> Route-map set-weight perm 10
> Set weight 1000
>
> Which stays.
>
>
> I have even tried adding a line 5 in set-metric to add 'set community
> no-export' to join both route-maps into one but the external AS ignores
> the metric statements. I am running IOS 12.0(10)
>
> What gives? All advice would be extremely appreciated!
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Ouellette, Tim
> Sent: 24 March 2002 00:39
> To: 'Carl Phelan'
> Cc: 'ccielab@groupstudy.com'
> Subject: RE: BGP - Transit Area
>
> Try setting a community of no-export on routes incoming from both of
> your
> ebgp peers. Obviously if your concerned about being non-transit then you
> have multiple connections to the "outside world" with multiple
> providers.
>
> If anyone else has other ways please respond!
>
> Tim
>
>
> -----Original Message-----
> From: Carl Phelan [mailto:carlphelan@hotmail.com]
> Sent: Saturday, March 23, 2002 12:00 PM
> To: ccielab@groupstudy.com
> Subject: BGP - Transit Area
>
>
> Hi All,
>
> I am practising doing normal tasks in different ways - as expected for
> the lab. In BGP, what is the simplest way to make an area a non-transit
> area without using an AS path filter?
>
> Many thanks for any advice.
>
> Carl
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