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

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## Configure the MST Interval Between Generation of Configuration Messages

Hello time must be configured if it is required to configure the interval between generation of configuration messages by the root switch.

1. Specify the interface for the interval and configure the MST interval.

       SEFOS# configure terminal
       SEFOS(config)# interface extreme-ethernet 0/1
       SEFOS(config-if)# spanning-tree mst hello-time 1

   The `hello-time` value range is 1-2 seconds. The default is 2.

       SEFOS(config-if)# end

2. View the MST port-specific configuration.

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

       Ex0/1 of MST00 is Designated, Forwarding
       Edge port: no
       Link type: Shared
       Port Hello Timer: 4 Sec
       Bpdus sent 271 , Received 308
       Instance  Role         Sts          Cost     Prio.Nbr
       --------  ----         ---          ----     --------
       0         Designated   Forwarding   200000   128.1
       1         Designated   Forwarding   200000   128.1

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