Spanning-Tree Guard - Cisco Catalyst 4500 Series Command Reference Manual

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches

spanning-tree guard

To enable root guard, use the spanning-tree guard command. To disable root guard, use the no form of
this command.
Syntax Description
loop
root
none
Defaults Root guard is disabled.
Command Modes
Interface configuration mode
Command History Release
12.1(8a)EW
12.1(12c)EW
Examples
This example shows how to enable root guard:
Switch(config-if)# spanning-tree guard root
Switch(config-if)#
Related Commands Command
show spanning-tree
OL-27596 -01
spanning-tree guard {loop | root | none}
no spanning-tree guard
Enables the loop guard mode on the interface.
Enables root guard mode on the interface.
Sets the guard mode to none.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Loop guard support was added.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
Description
Displays spanning-tree information.
spanning-tree guard
2-991