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| Sun Ethernet Fabric Operating System ### PVRST+ Administration Guide

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## Configure the BPDU Guard

You can enable or disable the BPDU guard on per port basis. The BPDU guard disables the port upon the BPDU reception on the port. The disablement effectively denies devices behind such ports from participation in the STP. After you disable a port, it must be manually re-enabled. By default, the BPDU guard is disabled.

1. Enter the interface configuration mode for the interface (0/1 in this example).

       TOR-1 SEFOS# configure terminal
       TOR-1 SEFOS(config)# interface extreme-ethernet 0/1
       TOR-1 SEFOS(config-if)#

2. Enable the BPDU guard on the port.

       TOR-1 SEFOS(config-if)# spanning-tree bpduguard enable

       PvrstBpduguard Enabled

       TOR-1 SEFOS(config-if)# end
       TOR-1 SEFOS#

3. Review the output for the BPDU guard on the port.

       TOR-1 SEFOS# show spanning-tree interface extreme-ethernet 0/1 bpduguard

       Bpdu Guard  is Enabled
       TOR-1 SEFOS#

4. Disable the BPDU guard on the interface.

       TOR-1 SEFOS# configure terminal
       TOR-1 SEFOS(config)# interface extreme-ethernet 0/1
       TOR-1 SEFOS(config-if)# no spanning-tree bpduguard

       PvrstBpduguard Disabled

       TOR-1 SEFOS(config-if)# end
       TOR-1 SEFOS#

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