Spanning-Tree Loopguard Default - Cisco 4500M Command Reference Manual

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.
Syntax Description
This command has no keywords or arguments.
Defaults
Loop guard is disabled.
Command Modes
Global configuration
Command History Release
12.1(12c)EW
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
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
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spanning-tree loopguard default
no spanning-tree loopguard default
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches
78-16201-01