You can configure a threshold rate for receiving TC/TCN packets. If the threshold is exceeded, you receive a warning message.
Use the following procedure to display the tc-receive-alarm-threshold configuration.
show spanning-tree tc-receive-alarm-threshold
Switch:1(config)#show spanning-tree tc-receive-alarm-threshold
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Spanning Tree TC/TCN Rx Alarm Threshold Configuration
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Interval : 1 minutes
Count : 2