Re: [isp-bgp] outband traffic load balance by AS

["David J. Hughes" <bambi@...>]

On 24/06/2005, at 2:31 AM, Aliaga, Luis Carlos - ((Per)) wrote:

> Hi all,
>
> Has anyone of you ever configured BGP for controlling the outbound
> traffic by selecting the destine AS as a way of distributing the load?
> any suggestion?

If these are Cisco devices you can do it by defining an AS path list 
that will match the AS's you want, then using that path list in a 
route-map to increase the local-pref of the prefixes from those ASs.  
If I've understood your question correctly you could do it with 
something like the following :

ip as-path access-list 10 permit AS_OF_ISP12
ip as-path access-list 10 permit AS_OF_ISP121
ip as-path access-list 10 permit AS_OF_ISP122
ip as-path access-list 10 permit AS_OF_ISP123
ip as-path access-list 10 deny .*

route-map ISP-21-and-peers permit 10
 match as-path 10
 set local-preference 150

route-map ISP-21-and-peers permit 20
 set local-preference 100

router bgp YOUR_AS
 neighbor ISP1_PEER_ADDR route-map ISP-21-and-peers in


David
...






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