After configuring interface-based Layer 2 protocol tunneling, check Layer 2 protocol tunneling information, such as the tunneled Layer 2 protocol names, protocol types, multicast destination MAC addresses, and specified multicast MAC addresses (group MAC addresses).
Run the display stp [ brief ] command to check the spanning tree information for tunneled STP, Rapid Spanning Tree Protocol (RSTP), or Multiple Spanning Tree Protocol (MSTP).