Cisco 7609-S Software Configuration Guide - Page 332

Enabling Loop Guard Chapter 21 Configuring Optional STP Features Step 1 Step 2 Command Router(config)# interface {type1 slot/port} | {port-channel port_channel_number} Router(config-if)# spanning-tree guard loop Purpose Selects a port to configure. Configures loop guard. Step 3 Router(config)# end Exits configuration mode. Step 4 Router# show spanning-tree interface 4/4 detail Verifies the configuration impact on that port. 1. type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet This example shows how to enable loop guard: Router# configure terminal Enter configuration commands, one per line. Router(config)# interface fastEthernet 4/4 Router(config-if)# spanning-tree guard loop Router(config-if)# ^Z End with CNTL/Z. This example shows how to verify the configuration: 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 on the port BPDU:sent 0, received 0 Router# Tip For additional information (including configuration examples and troubleshooting information), see the documents listed on this page: http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html 21-16 Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX OL-4266-08