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

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## Set the Spanning Tree Operating Mode

When the switch comes up, spanning tree is enabled by default with MSTP operating in the switch.

If the input for the spanning tree mode is different from the specified mode of operation, the switch shuts down the operational spanning-tree and starts the spanning-tree as specified.

1. Configure the spanning tree operating mode.

       SEFOS# configure terminal
       SEFOS(config)# spanning-tree mode mst
       SEFOS(config)# end

2. View the spanning tree information.

       SEFOS# show spanning-tree

       Root Id         Priority   32768
                       Address    00:01:02:03:04:01
                       Cost       0
                       Port       0 [0]
                       This bridge is the root
                      Max age 20 Sec, forward delay 15 Sec
                       Hello Time is 2 Sec
       MST00
       Spanning tree Protocol Enabled.
       MST00 is executing the mstp compatible Multiple Spanning Tree Protocol
       Bridge Id       Priority  32768
                       Address  00:01:02:03:04:01
                      Max age is 20 sec, forward delay is 15 sec
                       Hello Time is 2 sec                Dynamic Path Cost is Disabled                Dynamic Path Cost Lag-Speed Change is Disabled
       Name      Role         State        Cost     Prio   Type
       ----      ----         -----        ----     ----   ------
       Ex0/1     Designated   Forwarding   200000   128    SharedLan

3. Set the default spanning tree operating mode.

       SEFOS(config)# spanning-tree compatibility stp

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