Enabling Loop Guard Globally; Enabling Loop Guard Or Root Guard On Specified Interfaces - Cisco nexus 5000 series Cli Configuration Manual

Configuring STP Extensions
S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m

Enabling Loop Guard Globally

You can enable Loop Guard globally by default on all point-to-point spanning tree normal and network
ports. Loop Guard does not run on edge ports.
Loop Guard provides additional security in the bridge network. Loop Guard prevents alternate or root
ports from becoming the designated port because of a failure that could lead to a unidirectional link.
Note Entering the Loop Guard command for the specified interface overrides the global Loop Guard
command.
Before you configure this feature, you should do the following:
•
•
To enable Loop Guard globally, perform this task:
Command
Step 1
switch# configure terminal
Step 2
switch(config)# spanning-tree loopguard
default
This example shows how to enable Loop Guard on all spanning tree normal or network ports:
switch# configure terminal
switch(config)# spanning-tree loopguard default

Enabling Loop Guard or Root Guard on Specified Interfaces

Note You can run Loop Guard on spanning tree normal or network ports. You can run Root Guard on all
spanning tree ports: normal, edge, or network.
You can enable either Loop Guard or Root Guard on specified interfaces.
Enabling Root Guard on a port means that port cannot become a root port, and LoopGuard prevents
alternate or root ports from becoming the designated port because of a failure that could lead to a
unidirectional link.
Both Loop Guard and Root Guard enabled on an interface apply to all VLANs to which that interface
belongs.
Entering the Loop Guard command for the specified interface overrides the global Loop Guard
Note
command.
Before you configure this feature, you should do the following:
•
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
1-12
Ensure that STP is configured.
Ensure that you have spanning tree normal ports or have configured some network ports.
Ensure that STP is configured.
Chapter 1
Purpose
Enters configuration mode.
Enables Loop Guard by default on all spanning tree
normal and network ports. By default, global Loop
Guard is disabled.
Configuring STP Extensions
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