How are the 2 links being utilized at the moment?
Are both links sending/receiving traffic to/from the 6500?
If so, how are you forcing the route to go via both paths? (static routing) ?
You can potentially implement Policy Base Routing (PBR) in the 6500 to match traffic based on a set criteria and set the next hop to be one of the links. You will need to do the same in the 3745 for return traffic.
or
Are you talking about configuring priority queue on both links for egress traffic from the 6500?
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Edison.