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| Sun Ethernet Fabric Operating System ### STP Administration Guide

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## Enable Spanning Tree Loop Guard

1. Enable loop guard in switch 1.

       SEFOS(config)# interface extreme-ethernet 0/46
       SEFOS(config-if)# spanning-tree link-type point-to-point
       SEFOS(config-if)# spanning-tree loop-guard
       SEFOS(config-if)# end

2. View the output in Switch 1

       SEFOS# show spanning-tree interface extreme-ethernet 0/46 detail
       Port 46 [Ex0/46] of MST00 is Alternate , DiscardingEx0/46 is operating in the MSTP ModePort path cost  2000, Port priority  128,Port Identifier  128.46. Port HelloTime  2,Timers: Hello - 1, Forward Delay - 0, Topology Change - 0
       Designated root has priority 32768, address 00:02:02:03:04:01Designated Bridge has priority 32768, address 00:02:02:03:04:01Designated Port Id is 128.46, Designated pathcost is 0Operational Forward delay 15, Max age 20
       Received Hello Time 2 Sec
       Received Hello Time 2 SecNumber of Transitions to forwarding State : 1Auto-Edge is disabledPortFast is disabled, Oper-Edge is disabledLink type is point to PointBPDUs : sent 19, recieved 484
       Restricted Role is disabled.Restricted TCN is disabled.bpdu-transmit enabledbpdu-receive enabledLoop Guard is enabled

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