Specifying MST Mode Configuration

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

Execute the following commands in the switch to set the spanning tree compatibility version for STP.

Type the following:

  • Enter the Global Configuration Mode in ISS1.
iS5comm# configure terminal
  • Enter the MST Configuration submode.
iS5comm(config)# spanning-tree mst configuration
Note:

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

iS5comm(config-mst)# instance 1 vlan 1

Instance range is 1-16 and VLAN range is 1-4096.

  • Specify a configuration name for an MST region.
iS5comm(config-mst)# name region1
  • Specify the configuration revision number for the mst region.
iS5comm(config-mst)# revision 100

The range is 0-200000.

  • Return to the Privileged EXEC mode.
iS5comm(config)#end
  • View the spanning tree information by executing the following show command.
iS5comm# show spanning-tree mst configuration
Name        [region1]
Revision    100
Instance    Vlans mapped
--------   --------------------------------------  
0          2-1024,1025-2048,2049-3072,3073-4094 
1          1
---------------------------------------------------
Parent topic: Configuring MSTP