Cisco Catalyst 4500 Series - Spanning-Tree Guard

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