[c-nsp] Selecting an eBGP destination based on the source network.

[Bruce Pinsky]

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Rick Ernst wrote:
> 
> I'm trying to find some way to prefer an outbound eBGP peer based on the
> internal source network.  The idea is to prefer a particular provider for
> specific source networks due to SLA, performance, or other issues.
> 
> I've looked at conditional announcements and set ip next-hop, but they
> don't seem to be designed for what I'm looking at.
> 
> Am I missing something obvious, or is there some other way to accomplish
> this?
> It's easy to modify the inbound path based on outbound announcements, but
> once the multiple eBGP routes have made it into the (redundant) core (RR
> server) FIB, there is no control over where the traffic goes.
> 

Are you trying to alter the forwarding decision or the route selection?

My take is that you want to make forwarding decisions based on source
address rather than destination address.  In that case, you would want
Policy Based Routing.  So you would set the IP next-hop based on the source
address.

If you are trying to alter the route selection based on some criteria like
performance or SLAs, you may be able to do something with Optimized Edge
Routing.

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bep

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