ATEN ES0152 User Manual page 216

KVM over IP User Manual
TCN:
The number of (legacy) Topology Change Notification BPDU's received/
transmitted on the port.
Discarded Unknown:
The number of unknown Spanning Tree BPDU's received (and discarded) on
the port.
Discarded Illegal:
The number of illegal Spanning Tree BPDU's received (and discarded) on the
port.
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