Cisco 4500M User Manual

15-9
Software Configuration Guide—Release 12.2(25)EW
OL-6696-01
Chapter 15 Configuring STP Features
Enabling Loop Guard
This example shows how to enable root guard on Fast Ethernet interface 5/8:
Switch(config)# interface fastethernet 5/8
Switch(config-if)# spanning-tree guard root
Switch(config-if)# end
Switch#
This example shows how to verify the configuration:
Switch# show running-config interface fastethernet 5/8
Building configuration...
Current configuration: 67 bytes
!
interface FastEthernet5/8
switchport mode access
spanning-tree guard root
end
Switch#
This example shows how to determine whether any ports are in root inconsistent state:
Switch# show spanning-tree inconsistentports
Name Interface Inconsistency
-------------------- ---------------------- ------------------
VLAN0001 FastEthernet3/1 Port Type Inconsistent
VLAN0001 FastEthernet3/2 Port Type Inconsistent
VLAN1002 FastEthernet3/1 Port Type Inconsistent
VLAN1002 FastEthernet3/2 Port Type Inconsistent
VLAN1003 FastEthernet3/1 Port Type Inconsistent
VLAN1003 FastEthernet3/2 Port Type Inconsistent
VLAN1004 FastEthernet3/1 Port Type Inconsistent
VLAN1004 FastEthernet3/2 Port Type Inconsistent
VLAN1005 FastEthernet3/1 Port Type Inconsistent
VLAN1005 FastEthernet3/2 Port Type Inconsistent
Number of inconsistent ports (segments) in the system :10
Enabling Loop Guard
You can enable loop guard globally or per port.
To enable loop guard globally on the switch, perform this task:
Step 3
Switch(config-if)# end
Exits configuration mode.
Step 4
Switch# show spanning-tree
Verifies the configuration.
Command Purpose
Command Purpose
Step 1
Switch(config)# spanning-tree loopguard default
Enables loop guard globally on the switch.
Step 2
Switch(config)# end
Exits configuration mode.
Step 3
Switch# show spanning tree interface 4/4 detail
Verifies the configuration impact on a port.

Cisco 4500M Specifications

General

Brand	Cisco
Model	4500M
Category	Network Router
Language	English