123 
Syntax 
spanning-tree guard loop 
no spanning-tree guard loop 
Command Mode 
Interface Configuration Mode (interface fastEthernet / interface range 
fastEthernet / interface gigabitEthernet / interface range gigabitEthernet) 
Example 
Enable the Loop Protect function for port 2: 
TL-SL2428(config)# interface fastEthernet 1/0/2 
TL-SL2428(config-if)# spanning-tree guard loop 
spanning-tree guard root 
Description 
The  spanning-tree guard root command is used to enable the Root Protect 
function for a port. With the Root Protect function enabled, the root bridge will 
set itself automatically as ERROR-PORT when receiving BPDU packets with 
higher priority, in order to maintain the role of root ridge. To disable the Root 
Protect function, please use no spanning-tree guard root command. 
Syntax 
spanning-tree guard root 
no spanning-tree guard root 
Command Mode 
Interface Configuration Mode (interface fastEthernet / interface range 
fastEthernet / interface gigabitEthernet / interface range gigabitEthernet) 
Example 
Enable the Root Protect function for port 2: 
TL-SL2428(config)# interface fastEthernet 1/0/2 
TL-SL2428(config-if)# spanning-tree guard root 
spanning-tree guard tc 
Description 
The  spanning-tree guard tc command is used to enable the TC Protect of 
Spanning Tree function for a port. To disable the TC Protect of Spanning Tree