[c-nsp] BGP failover for two traffic types

[Adam Greene]

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