Cisco WS-C2980G-A Software Guide - Page 97

CH A P T E R 7 Configuring Spanning Tree 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. Note For information on configuring the spanning tree PortFast, UplinkFast, and BackboneFast features, see Chapter 8, "Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard." This chapter consists of these sections: • Understanding How STPs Work, page 7-2 • Understanding How PVST+ and MISTP Modes Work, page 7-11 • Understanding How Bridge Identifiers Work, page 7-13 • Understanding How MST Works, page 7-14 • Rate limited at one for every 60 seconds, page 7-22 • Using MISTP-PVST+ or MISTP, page 7-30 • Configuring a Root Switch, page 7-39 • Configuring Spanning Tree Timers, page 7-44 • Understanding How BPDU Skewing Works, page 7-22 • Configuring Spanning Tree BPDU Skewing, page 7-57 • Configuring MST, page 7-46 Note For complete syntax and usage information for the commands used in this chapter, refer to the Catalyst 4500 Series, Catalyst 2948G, and Catalyst 2980G Switches Command Reference. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 7-1