The reason for our issue was what the Cisco engineer called "micro bursts" that fills up the queue but isnt really showing as high bandwith usage.So there were drops on the outgoing interface towards our 3750-stack with 4xGbit etherchannel.We rebuild...

We are having similar issues as well.A dot1q-tunneling network with WS-C3750X-24T-L. 10Gbit btw them.Edge-switches connected with LACP and Etherchannel to the 3750X devices.NetApp connected via 10Gbit to 3750X. Fallback 2x1Gbit LACP to edge-switch.VM...