I have 3 separate questions,.
(a) Imagine I have a server with 2 NICs and I want to team them. If NIC 1 is connected to access switch 1 and NIC 2 to access switch 2, the only NIC teaming methodology that can be used is one in which one NIC is active and the other is in standby. The reason is that you would have a loop if both NICs were active (assuming L2 adjacency between switches). Is that part about the loop correct? If so, the way to get away from the loop is to have access switches, like the Nexus 5000, that does vPC. Correct? SEE THE ATTACHED DIAGRAM.
(b) If there is indeed a loop, which mechanism causes one NIC uplink to be active and the other to go standby. Its not STP. The NICs are connecte to access ports.
(2) What about 2 separate NICs, as in the first scenario, BUT the two access switches are stacked, like two 3750s?
(3) What about the case where you have one dual-port NIC with the same uplink connections to the two switches and no vPC or stacking? Still be a loop?
May I please have 3 separate answers?