[c-nsp] Best Routing Protocol for Scenario

[Paul Stewart]

Hi folks...

A while back (month or so) I posed a few questions about Policy Based
Routing - thinking that was best way to conquer a new challenge... now I'm
not so sure so looking for input.

Here's the layout and what I want to accomplish....

Customer premise has a Cisco 3662 router.  From the 3662 we have 2 TI's
leaving and 2 Ethernet connections leaving towards a 6509 back in our data
center.  The 2 T1's go to a remote POP where they terminate on a Cisco 3640
router.  The Cisco 3640 router connects to a Cisco 7206VXR which in turn
connects via TLS back to the same 6509 in our data center.  The ethernet
connections leaving the customer site from the Cisco 3662 connect directly
back to the 6509 with speeds of 6 Mb/s X 800Kb/s each.  The T1's are full
1.544 Mb/s.

So, one router at customer premise that needs to connect back to one router
in our data center using 4 paths.  The pair of T1's and the pair of ethernet
ports should be "bonded" or load balanced.  Traditionally this has been done
via OSPF/CEF on our side of things.

We want all VOIP traffic passing between the customer site and our data
center to travel via the T1 circuits and all Internet traffic to go via the
ethernet connections.

I'm looking for the best routing protocol in this scenario that will allow
me to use route-maps (or other alternatives) to identify source IP and
destination IP subnets and apply priority.  At the same time if the "far
end" of each connection is unavailable then I want the traffic to "fallover"
to the other connections as a backup automatically.

I had though at one point that OSPF would be ideal but I'm not aware of a
way to apply a route-map to OSPF specifying only certain traffic prefers a
certain path.  We do this all the time with BGP so I though maybe iBGP could
be applied here but I have the feeling that there is a better solution....

Open to ideas and appreciate it...

Paul