Enabling Loop Guard - Cisco Catalyst 2960-XR Configuration Manual

Enabling Loop Guard

Beginning in privileged EXEC mode, follow these steps to enable root guard on the switch.
SUMMARY STEPS
1. configure terminal
2. interface interface-id
3. spanning-tree guard root
4. end
DETAILED STEPS
Command or Action
Step 1 configure terminal
Example:
Switch# configure terminal
Step 2 interface interface-id
Example:
Switch(config)# interface gigabitethernet1/0/2
Step 3
spanning-tree guard root
Example:
Switch(config-if)# spanning-tree guard root
Step 4
end
Example:
Switch(config-if)# end
Related Topics
Root Guard, on page 89
Enabling Loop Guard
You can use loop guard to prevent alternate or root ports from becoming designated ports because of a failure
that leads to a unidirectional link. This feature is most effective when it is configured on the entire switched
network. Loop guard operates only on interfaces that are considered point-to-point by the spanning tree.
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
100
Configuring Optional Spanning-Tree Features
Purpose
Enters the global configuration mode.
Specifies an interface to configure, and enters interface
configuration mode.
Enables root guard on the interface.
By default, root guard is disabled on all interfaces.
Returns to privileged EXEC mode.
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