Cisco Systems EA6500 Manual De Usuario

Use the set spanning-tree guard command to enable or disable the spanning tree loop guard feature on 
a per-port basis.

To enable loop guard globally on the switch, perform this task:

This example shows how to enable loop guard globally:

Router# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)# spanning-tree loopguard default 

Router(config)# ^Z

Router# show spanning-tree interface fastEthernet 4/4 detail 

 Port 196 (FastEthernet4/4) of VLAN0010 is forwarding 

   Port path cost 1000, Port priority 160, Port Identifier 160.196.

   Designated root has priority 32768, address 00d0.00b8.140a

   Designated bridge has priority 32768, address 00d0.00b8.140a

   Designated port id is 160.196, designated path cost 0

   Timers:message age 0, forward delay 0, hold 0

   Number of transitions to forwarding state:1

   The port is in the portfast mode by portfast trunk configuration

   Link type is point-to-point by default

   Bpdu filter is enabled

   Loop guard is enabled by default on the port

   BPDU:sent 0, received 0

To enable loop guard on an interface, perform this task:

This example shows how to enable loop guard:

Router# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)# interface fastEthernet 4/4

Router(config-if)# spanning-tree guard loop

Router(config-if)# ^Z

Router(config)# spanning-tree loopguard default 

Enables loop guard globally on the switch.

Router(config)# end 

Exits configuration mode.

Router# show spanning tree interface 4/4 detail 

Verifies the configuration impact on a port.

Router(config)# interface {type

1

 slot/port} | 

{port-channel port_channel_number}

1.

type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet 

Selects an interface to configure. 

Router(config-if)# spanning-tree guard loop 

Configures loop guard.

Router(config)# end 

Exits configuration mode.

Router# show spanning tree interface 4/4 detail 

Verifies the configuration impact on that port.