1-42MST region-related parameters include: region name, revision level, and VLAN-to-MSTI mapping table.By default:z MST region name is the first MAC address of the switchz All VLANs are mapped to the CIST in the VLAN-to-MSTI mapping tablez The MSTP revision level is 0You can modify the three parameters after entering MST region view by using the stpregion-configuration command.NTDP packets sent by devices in a cluster can be transmitted in only the instances where themanagement VLAN of the cluster resides.Examples# Enter MST region view. system-viewSystem View: return to User View with Ctrl+Z.[Sysname] stp region-configuration[Sysname-mst-region]stp root primarySyntaxstp [ instance instance-id ] root primary [ bridge-diameter bridgenum [ hello-time centi-seconds ] ]undo stp [ instance instance-id ] rootViewSystem viewParametersinstance-id: MSTI ID ranging from 0 to 16. The value of 0 refers to the CIST.bridgenum: Network diameter of the specified spanning tree. This argument ranges from 2 to 7 anddefaults to 7.centi-seconds: Hello time in centiseconds of the specified spanning tree. This argument ranges from100 to 1,000 and defaults to 200.DescriptionUse the stp root primary command to configure the current switch as the root bridge of a specifiedMSTI.Use the undo stp root command to cancel the current configuration.By default, a switch is not configured as a root bridge.If you do not specify the instance-id argument, these two commands apply to only the CIST.
