Cisco 4500M Command Reference

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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
spanning-tree loopguard default
spanning-tree loopguard default
To enable loop guard as the default on all ports of a specific bridge, use the spanning-tree loopguard
default command. To disable loop guard, use the no form of this command.
spanning-tree loopguard default
no spanning-tree loopguard default
Syntax Description This command has no keywords or arguments.
Defaults Loop guard is disabled.
Command Modes Global configuration
Command History
Usage Guidelines Loop guard provides an additional security in the bridge network. Loop guard prevents alternate or root ports
from becoming the designated port because of a failure leading to a unidirectional link.
Loop guard only operates on ports that are considered point-to-point by the spanning tree.
Individual loop-guard port configuration overrides this global default.
Examples This example shows how to enable loop guard:
Switch(config)# spanning-tree loopguard default
Switch(config)#
Related Commands show spanning-tree
spanning-tree guard
Release Modification
12.1(12c)EW Support for this command was introduced on the Catalyst 4500 series switch.

Cisco 4500M Specifications

General

Brand	Cisco
Model	4500M
Category	Network Router
Language	English