[c-nsp] BGP Configuration

[Mark Tinka]

On Wednesday 03 August 2005 14:01, Mark Tohill wrote:
> Hi,

Hi Mark.

> When declaring a EBGP peer, can you have something
> like the following?

Yes, what you've mentioned below would work. Essentially, 
what you are saying with the route-map is:

* In your AS_PATH, prepend all networks listed in ACL 30
  with your ASN 3 times. Possible you want those networks
  to attract less_to_no traffic over the Provider 1
  circuit.

With the prefix list, you are saying:

* Announce only these networks to Provider 1, regardless
  of which other networks my router knows about.

> Maybe the route map and prefix-list can be merged?

Not necessarily, unless the second route-map has a 
specific action as in the first. You see, in the first, 
your action is to prepend your ASN 3 times in your 
AS_PATH.

With the prefix list, it appears your action is to filter 
what you announce to Provider 1. For this reason, I 
don't see the need for another route-map; unless there 
is something else you are looking to accomplish.

Mark.

>
>
>
> Thanks,
>
> Mark
>
>
>
> !
>
> ! External BGP Peers
>
> !
>
>  neighbor <EBGP Peer 1> remote-as 65123
>
>  neighbor < EBGP Peer 1> version 4
>
>  neighbor < EBGP Peer 1> password <password required>
>
>  neighbor < EBGP Peer 1> route-map Prov1_ASPRE_OUT out
>
>  neighbor < EBGP Peer 1> prefix-list Prov1_OUT out
>
> !
>
> ! ROUTE MAP
>
> route-map Prov1_ASPRE_OUT permit 10
>
>  match ip address 30
>
>  set as-path prepend 65123 65123 65123
>
> !
>
> !
>
> ip prefix-list Prov1_OUT permit 192.168.10.0/24
>
> ip prefix-list Prov1_OUT permit 192.168.11.0/24
>
> !
>
> Access list 30.......
>
>
>
>
>
>
>
>
>
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