[c-nsp] BGP failover for two traffic types
Rodney Dunn
rodunn at cisco.com
Thu Jul 23 09:09:46 EDT 2009
Look in to PBR with either router tracking or one of the other IP SLA
event types to monitor for the link going down.
Rodney
Adam Greene wrote:
> Hi,
>
> I have a CE router doing eBGP peering with two of my PE routers over
> distinct WAN circuits. The CE router services two netblocks on its LAN
> interface: one is for VOICE, the other (secondary IP address) is for DATA.
>
> I want the customer's DATA traffic to flow to/from PE1 by default, and
> voice traffic to flow to/from PE2 by default. In the event of an outage
> on one of the circuits, I want all traffic to flow over the circuit
> that's still up.
>
> I already know how to manipulate the traffic inbound to the CE router in
> this way, using conditional BGP advertisements. However, I can't figure
> out how to make the customer's outbound traffic prefer one link or
> another depending on whether it's DATA or VOICE, except by using
> route-maps, and those don't play nice as far as failing over to a backup
> link if the primary link is down.
>
> I've toyed with the idea of trying to use VRF for this application, but
> I'm pretty new to it and don't know if it's really a viable approach.
>
> Interested in ideas ... should I attempt a solution based on VRF? Or
> maybe there is a simpler solution ....
>
> thanks,
> Adam
>
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