running CAT 6513, IOS v12.2(33) (sxh)
created 2 trunks interfaces and attempted to add them to an etherchannel. One of the interfaces continued to drop into an up/down(not connected) state with the following error in the log:
Jun 4 16:54:51: %EC-SP-5-CANNOT_BUNDLE2: Gi8/35 is not compatible with Gi4/28 and will be suspended (flow control send of Gi8/35 is on, Gi4/28 is off.
So, i disabled send flowcontrol on 8/35. This allowed me to add to the EC, but i later looked at this interface and found it to be negotiating at 100mb full rather than 1gb full.
The EC is being used to trunk multiple vlans to a VMWare ESX host. I thought possibly the NIC on the host was causing the problem, but found it to be set to auto-negotiate.
Any thoughts on this?