I'm setting up a port-channel between a router (2901) and a switch (3750). I know that the port-channel configuration on the router side is layer 3. As for the port-channel on the switch side, does it have to be configured as layer 3 aswell or can it be layer 2? I've tried the switch's port-channel config as both a layer 3 and a layer 2 and both configuration appears to work. What is the recommend port-channel configuration when going from a router to a switch?