HP 6120G/XG HP ProCurve Series 6120 Blade Switches Advanced Traffic Management - Page 148

Multiple Instance Spanning-Tree Operation Configuring MSTP Syntax: [no] spanning-tree instance < 1..32 > vlan < vid [ vid..vid ] > no spanning-tree instance < 1..32 > Configuring MSTP on the switch automatically configures the IST instance and places all statically and dynamically configured VLANs on the switch into the IST instance. This command creates a new MST instance (MSTI) and moves the VLANs you specify from the IST to the MSTI. You must map at least one VLAN to an MSTI when you create it. You cannot map a VLAN ID to more than one instance. You can create up to 32 MSTIs in a region. The no form of the command removes one or more VLANs from the specified MSTI. If no VLANs are specified, the no form of the command deletes the specified MSTI. When you remove a VLAN from an MSTI, the VLAN returns to the IST instance, where it can remain or be re-assigned to another MSTI configured in the region. Note: The valid VLAN IDs that you can map to a specified MSTI are from 1 to 4094. The VLAN ID-to-MSTI mapping does not require a VLAN to be already configured on the switch. The MSTP VLAN enhancement allows you to preconfigure MSTP topologies before the VLAN IDs associated with each instance exist on a switch. When you use preconfigured VLAN ID-to-MSTI topologies, ensure that MSTP switches remain in the same region by mapping all VLAN IDs used in the region to the same MSTIs on each regional switch. Configuring MSTP Instances with the VLAN Range Option For the switches covered in this guide, if you use the spanning-tree instance command with the VLAN range option, even if the range includes VLANs that are not currently present on the switch, the entire range of VLANs is configured. For example, if VLANs 1, 5, and 7 are currently present and you enter this command: ProCurve(config)# spanning-tree instance 1 vlan 1-10 then all the VLANs from 1 through 10 are included, even those VLANs that are not present. 4-44