Table 12-2 summarizes the commands as a quick reference. Rather than tuning STP for a VLAN instance, you use an MST instance. The parameters and timers are identical to those discussed in Chapter 10, “Spanning Tree Configuration.” In fact, the commands are very similar except for the addition of the mst keyword and the instance-id. You can also tune the parameters that MST uses when it interacts with CST or traditional 802.1D. A switch cannot run both MST and PVST+ at the same time. Step 7 Exit the MST configuration mode commit the changes to the active MST region configuration:Īfter MST is enabled and configured, PVST+ operation stops and the switch changes to RSTP operation. Step 6 Show the pending changes you have made: (Remember that by default, all VLANs are mapped to instance 0, the IST.)
You can also add a range of VLANs to the list by separating numbers with a hyphen. The list can contain one or more VLANs separated by commas. The instance-id (0 to 15) carries topology information for the VLANs listed in vlan-list. Switch(config-mst)# instance instance-id vlan vlan-list Therefore, you also need to update the revision numbers on the other switches to match. Remember that the region configuration (including the revision number) must match on all switches in the region. Each time you make changes to the configuration, you should increase the number by one. The configuration revision number gives you a means to track changes to the MST region configuration. Step 4 Assign a region configuration revision number (0 to 65,535): Step 3 Assign a region configuration name (up to 32 characters): Switch(config)# spanning-tree mst configuration 296 Chapter 12: Advanced Spanning Tree Protocol
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