Cisco ME 3800X Command Reference Manual page 458

spanning-tree guard
You can override the setting of the spanning-tree loopguard default global configuration command by
using the spanning-tree guard loop interface configuration command on an STP interface.
You can verify your settings by entering the show running-config privileged EXEC command.
Examples
This example shows how to enable root guard on all the VLANs associated with the specified port:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# spanning-tree guard root
This example shows how to enable loop guard on all the VLANs associated with the specified port:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# spanning-tree guard loop
Related Commands Command
show running-config
spanning-tree cost
spanning-tree loopguard default
spanning-tree mst cost
spanning-tree mst port-priority
spanning-tree mst root
spanning-tree port-priority
spanning-tree vlan priority
Cisco ME 3800X and ME 3600X Switch Command Reference
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Description
Displays the operating configuration.
Sets the path cost for spanning-tree calculations.
Prevents alternate or root ports from becoming designated
ports because of a failure that leads to a unidirectional link.
Configures the path cost for MST calculations.
Configures an STP MST port priority.
Configures the MST root switch priority and timers based on
the network diameter.
Configures an STP port priority.
Sets the switch priority for the specified spanning-tree
instance.
Chapter
OL-28238-01