Enabling Loop Guard Globally - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

About STP Extensions
Step 2
Step 3
Step 4
This example shows how to explicitly enable BPDU Filtering on the Ethernet spanning tree edge port 1/4:
switch# configure terminal
switch (config)# interface ethernet 1/4
switch(config-if)# spanning-tree bpdufilter enable

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
Ensure that STP is configured.
Ensure that you have spanning tree normal ports or have configured some network ports.
Procedure
Step 1
Step 2
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
OL-16597-01
Command or Action
switch(config)# interface type
slot/port
switch(config-if)# spanning-tree
bpdufilter {enable | disable}
switch(config-if)# no spanning-tree
bpdufilter
Command or Action
switch# configure terminal
switch(config)# spanning-tree
loopguard default
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
Enabling Loop Guard Globally
Purpose
Specifies the interface to configure, and enters the
interface configuration mode.
Enables or disables BPDU Filtering for the specified
spanning tree edge interface. By default, BPDU Filtering
is disabled.
(Optional)
Disables BPDU Filtering on the interface.
Note Enables BPDU Filtering on the interface if the
interface is an operational spanning tree edge
port and if you enter the spanning-tree port type
edge bpdufilter default command.
Purpose
Enters configuration mode.
Enables Loop Guard by default on all spanning tree
normal and network ports. By default, global Loop
Guard is disabled.
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