We have a Datacenter solution witch Cisco 6500, 3750E and 2960 switches.
6500 distribution layer
3750E aggregation layer (connected to two distr switches)
2960 access layer (connected to 3750E stack via Etherchannel)
All switches are configured for Spanning Tree MST witch identical name, rev no and VLAN instance mapping.
On the 3750E: The etherchannel towards the 2960 goes to Spanning Tree blocking due tp "p2p dispute"
How du I fix this?