Enabling Loop Guard Or Root Guard On Specified Interfaces - Cisco Nexus 3000 series Configuration Manual

Configuring STP Extensions
Entering the Loop Guard command for the specified interface overrides the global Loop Guard command.
Note
Before You Begin
Ensure that STP is configured.
Ensure that you have spanning tree normal ports or have configured some network ports.
SUMMARY STEPS
1. switch# configure terminal
2. switch(config)# spanning-tree loopguard default
DETAILED STEPS
Command or Action
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

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.
Note Entering the Loop Guard command for the specified interface overrides the global Loop Guard command.
Before You Begin
Ensure that STP is configured.
Ensure that you are configuring Loop Guard on spanning tree normal or network ports.
Purpose
Enters configuration mode.
Enables Loop Guard by default on all spanning tree normal and
network ports. By default, global Loop Guard is disabled.
Cisco Nexus 3000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U1(1)
Configuring STP Extensions
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