Greetings:
When you say "redundancy", there is redundancy of ckts and routers. It sounds more like your are taking about load balancing accross two routers. You can do what you want in a certain form, but I am not sure I can explain it clearly in writing.
If you
1) want to do load balancing with two ckts, you can put on the same router and have both ckts
coming handling traffic.
2) want to have a redundant router, use HSRP.
3) want to do load balancing over two routers between the same sites, you will have to do
send some hosts over 1 router and some over another and have a static in each router, so if
the F-Relay fails, it will route all traffic over the other ckt.
Like I said, it is easier to explain over the phone. If this is not clear, hopefully, someone will clarify or else you may want to open a TAC case.
Thanks...Steve