CHAPTER
7-1
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
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
• 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 that are used in this chapter, refer to the
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command
Reference.
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