The set protocols spanning-tree stp interface tcn-guard command configures TCN (Topology Change Notification) guard on a physical port or a LAG port for STP mode.
set protocols spanning-tree stp interface <interface-name> tcn-guard <true | false>
Specifies a port name. The value is a string that can be set to a physical port name or a LAG port.
tcn-guard <true | false>
Enables or disables TCN-guard on a port. The value could be true or false.
By default, TCN-guard is disabled.
TCN BPDU is generated when the switch detects a change in the spanning tree topology. If the switch receives many TCN BPDUs in a short period of time, the spanning tree recalculates frequently, causing a large burden on the device and affecting the stability of the network.
After the TCN guard function is enabled, the switch processes only a certain number of topology change packets in a certain period.
- Enable TCN guard on the port ge-1/1/1 for STP mode.