TL-SL3428/TL-SL3452 JetStream L2 Managed Switch CLI Guide
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fastEthernet / interface gigabitEthernet / interface range gigabitEthernet)
Example
Enable the Root Protect function for Fast Ethernet port 2:
TL-SL3428(config)#interface fastEthernet 1/0/2
TL-SL3428(config-if)#spanning-tree guard root