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## Enable the Topology Change

See Dynamic Path Cost Topology Example for the topology for this procedure. When a port is configured as restricted TCN, the port does not process and propagate any topology change information received on the configured port. Enabling this configuration could cause temporary connectivity loss after changes in active spanning tree topology. The connectivity loss is due to incorrect learned station location information.

By default, the restricted TCN feature is disabled. For provider bridges, restricted TCN is always enabled on customer network ports.

1. Configure the restricted TCN feature on the port.

       SEFOS# configure terminal
       SEFOS(config)# interface extreme-ethernet 0/1
       SEFOS(config-if)# spanning-tree restricted-tcn
       SEFOS(config-if)# end

2. View the restricted TCN configuration.

       SEFOS# show spanning-tree detail

       Spanning tree Protocol Enabled.

       MST00 is executing the mstp compatible Multiple Spanning Tree Protocol
       Bridge Identifier has Priority 32768, Address 00:01:02:03:04:01
       Configured  Max age 20 sec,  Forward delay 15 sec
       Configured Hello Time 2 sec
       Dynamic Path Cost Disabled
       Flush Interval 0 centi-sec, Flush Invocations 72
       Flush Indication threshold 0
       Current Root has priority 32768, address 00:02:02:03:04:01cost of root path is 2000Number of Topology Changes 1, Time since topology Change 89 seconds agoTransmit Hold-Count 3Root Times : Max age 20 Sec Forward delay 15 SecPort 45 [Ex0/45] of MST00 is Root , ForwardingEx0/45 is operating in the MSTP ModePort path cost 2000, Port priority 128,Port Identifier 128.45. Port HelloTime 2,Timers: Hello - 1, Forward Delay - 0, Topology Change - 0Designated root has priority 32768, address 00:02:02:03:04:01

       Designated Bridge has priority 32768, address 00:02:02:03:04:01
       Designated Port Id is 128.45, Designated pathcost is 0Operational Forward delay 15, Max age 20Received Hello Time 2 SecNumber of Transitions to forwarding State : 1Auto-Edge is enabledPortFast is disabled, Oper-Edge is disabledLink type is point to PointBPDUs : sent 4, recieved 4466Restricted Role is disabled.Restricted TCN is disabled.bpdu-transmit enabledbpdu-receive enabledLoop Guard is disabled

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