Configuration restrictions and guidelines
When you configure mCheck, follow these restrictions and guidelines:
The mCheck operation takes effect on devices operating in MSTP, PVST, or RSTP mode.
When you enable or disable TRILL on a port, the port might send TCN BPDUs to the peer port, which causes the peer port to transit to STP mode. When you disable TRILL and enable STP on a port, perform mCheck on both the port and the peer port as a best practice.