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

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## Specify MST Mode Configurations

You can specify the properties of an interface for MSTP. Values for the instance range are 1-16. Values for VLAN range are 1-4096. Values for the configuration revision number for the MST region can be 0-200000.

1. Configure the MST configuration submode.

       SEFOS# configure terminal
       SEFOS(config)# spanning-tree mst configuration

   The MST configuration submode is used to make only instance-specific and MST region configurations.

2. Map VLANs to an MST instance.

       SEFOS(config-mst)# instance 1 vlan 1

3. Make the switch STP compatible with the `spanning-tree compatibility stp` command.
4. Specify a configuration name for an MST region.

       SEFOS(config-mst)# name region1

5. Specify the configuration revision number for the MST region.

       SEFOS(config-mst)# revision 100
       SEFOS(config-mst)# end

   The spanning tree mode is changed based on your input.

6. View the spanning tree MST configuration information.

       SEFOS# show spanning-tree mst configuration

       Name            [region1]
       Revision        100
       Instance        Vlans mapped
       --------        ----------------------------------------
         0              2-1024,1025-2048,2049-3072,3073-4094
         1              1
        -------------------------------------------------------

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