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The Cisco proprietary spanning tree protocols, PVST+ and MISTP, are based on the IEEE 802.1D STP. This section describes the specific functions that are common to all spanning tree protocols. Note For complete syntax and usage information for the commands that are used in this chapter, refer to the Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command Reference. This chapter describes the IEEE 802.1D bridge Spanning Tree Protocol (STP) and how to use and configure Cisco's proprietary STPs, Per VLAN Spanning Tree + (PVST+), and Multi-Instance Spanning Tree Protocol (MISTP) on the Catalyst enterprise LAN switches. Mapping and Unmapping VLANs to an MST Instance

Using Root Guard-Preventing Switches from Becoming RootĬonfiguring the MST Port Instance Priority Setting the MISTP-PVST+ Mode or MISTP ModeĬonfiguring the MISTP Port Instance Priorityĭetermining an MISTP Instance-VLAN Mapping ConflictsĬonfiguring a Root Switch to Improve Convergence Understanding How Bridge Identifiers WorkĬonfiguring the PVST+ Default Port Cost Mode

Understanding How PVST+ and MISTP Modes Work Understanding How a Switch or Port Becomes the Root Switch or Root PortĬalculating the Port Cost Using the Short MethodĬalculating the Port Cost Using the Long MethodĬalculating the Port Cost for Aggregate Links Configuring Spanning Tree Table Of Contents