Enabling Loop Guard Globally - Cisco Nexus 9000 Series Configuration Manual

Configuring STP Extensions Using Cisco NX-OS

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.
Entering the Loop Guard command for the specified interface overrides the global Loop Guard command.
Note
Before You Begin
Before you configure this feature, you should do the following:
• Ensure that STP is configured.
• Ensure that you have spanning tree normal ports or have configured some network ports.
Procedure
Step 1
Step 2
Step 3
Step 4
Step 5
Command or Action
config t
Example:
switch# config t
switch(config)#
spanning-tree loopguard default
Example:
switch(config)# spanning-tree loopguard
default
exit
Example:
switch(config)# exit
switch#
show spanning-tree summary
Example:
switch# show spanning-tree summary
copy running-config startup-config
Example:
switch# copy running-config
startup-config
Cisco Nexus 9000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
Enabling Loop Guard Globally
Purpose
Enters configuration mode.
Enables Loop Guard by default on all
spanning tree normal and network ports. By
default, global Loop Guard is disabled.
Exits configuration mode.
(Optional)
Displays summary STP information.
(Optional)
Copies the running configuration to the
startup configuration.
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