How to check whether forwarding is looped on a Layer 2 network

The following events indicate that forwarding is looped on a Layer 2 network:
Massive congestion and full-bandwidth storm. Run the display interface ethernet brief | include up command to check whether the incoming and outgoing traffic of a port reaches the maximum.
Massive MAC address flapping is found during MAC flapping detection. Run the display trap logbuffer command to check whether MAC address flapping alarms are generated.

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