1-17Configuring MSTPConfiguring an MST RegionMake the following configurations on the root bridge and on the leaf nodes separately.Follow 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 MST regionname region-name nameOptionalThe MST region name is theMAC address by default.instance instance-id vlan vlan-listConfigure theVLAN-to-instance mappingtable vlan-mapping modulo moduloOptionalUse either command.All VLANs in an MST regionare mapped to MSTI 0 bydefault.Configure the MSTPrevision level of the MSTregionrevision-level level Optional0 by defaultDisplay the MST regionconfigurations that are notactivated yetcheck region-configuration OptionalActivate MST regionconfiguration manually active region-configuration RequiredDisplay the configurationsof currently activated MSTregionsdisplay stp region-configuration The display command canbe executed in any view.z Two or more MSTP-enabled devices belong to the same MST region only if they are configured tohave the same format selector (0 by default, not configurable), MST region name, the sameVLAN-to-instance mapping entries in the MST region and the same MST region revision level, andthey are interconnected via a physical link.z The configuration of MST region–related parameters, especially the VLAN-to-instance mappingtable, will cause MSTP to launch a new spanning tree calculation process, which may result innetwork topology instability. To reduce the possibility of topology instability caused by configuration,MSTP will not immediately launch a new spanning tree calculation process when processing MSTregion–related configurations; instead, such configurations will take effect only after you activatethe MST region–related parameters using the active region-configuration command, or enableMSTP using the stp enable command in the case that MSTP is not enabled.
