TP-Link T2500-28TCTL-SL5428E T2500-28TCUN V1 CLI Reference Guide - Page 234

T2500-28TC JetStream L2 Managed Switch CLI Guide T2500-28TC(config)#interface fastEthernet 1/0/2 T2500-28TC(config-if)#spanning-tree bpduguard spanning-tree guard loop Description The spanning-tree guard loop command is used to enable the Loop Protect function for a port. Loop Protect is to prevent the loops in the network brought by recalculating STP because of link failures and network congestions. To disable the Loop Protect function, please use no spanning-tree guard loop command. 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 Fast Ethernet port 2: T2500-28TC(config)#interface fastEthernet 1/0/2 T2500-28TC(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 bridge. To disable the Root Protect function, please use no spanning-tree guard root command. Syntax spanning-tree guard root no spanning-tree guard root 217