1-17Configuring Root BridgeConfiguring an MST RegionConfiguration procedureFollow these steps to configure an MST region:To do... Use the command... RemarksEnter system view system-view —Enter MST region view stp region-configuration —Configure the name of the MSTregion region-name nameRequiredThe default MST region name of aswitch is its MAC address.instance instance-id vlanvlan-listConfigure the VLAN-to-instancemapping table for the MST region vlan-mapping modulomoduloRequiredBoth commands can be used toconfigure VLAN-to-instancemapping tables.By default, all VLANs in an MSTregion are mapped to MSTI 0.Configure the MSTP revisionlevel for the MST region revision-level levelRequiredThe default revision level of anMST region is level 0.Activate the configuration of theMST region manuallyactiveregion-configuration RequiredDisplay the configuration of thecurrent MST regioncheckregion-configuration OptionalDisplay the currently validconfiguration of the MST regiondisplay stpregion-configuration Available in any viewNeighbor Topology Discovery Protocol (NTDP) packets sent by devices in a cluster can only betransmitted within the MSTI where the management VLAN of the cluster resides. For more informationabout clusters and the NTDP protocol, see Cluster Operation.Configuring MST region-related parameters (especially the VLAN-to-instance mapping table) results inspanning tree recalculation and network topology jitter. To reduce network topology jitter caused by theconfiguration, MSTP does not recalculate spanning trees immediately after the configuration; it doesthis only after you perform one of the following operations, and then the configuration can really takeseffect:z Activate the new MST region-related settings by using the active region-configuration commandz Enable MSTP by using the stp enable command
