CHAPTER
7-1
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
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 spanning-tree protocols, Per VLAN Spanning Tree + (PVST+) and
Multi-Instance Spanning Tree Protocol (MISTP), on the Catalyst 6500 series switches.
Note For information on configuring the spanning-tree PortFast, UplinkFast, and BackboneFast features, see
Chapter 9, “Configuring Spanning-Tree PortFast, UplinkFast, BackboneFast, and Loop Guard.”
This chapter consists of these sections:
• Understanding How Spanning Tree Protocols Work, page 7-2
• Understanding How PVST+ and MISTP Modes Work, page 7-12
• Understanding How Bridge Identifiers Work, page 7-14
• Understanding How Multiple Spanning Tree Works, page 7-16
• Understanding How BPDU Skewing Works, page 7-24
• Understanding How Layer 2 PDU Rate Limiting Works, page 7-25
• Configuring PVST+ on the Switch, page 7-26
• Configuring Rapid-PVST+ on the Switch, page 7-33
• Configuring MISTP-PVST+ or MISTP on the Switch, page 7-34
• Configuring a Root Switch, page 7-44
• Configuring Spanning-Tree Timers on the Switch, page 7-49
• Configuring Multiple Spanning Tree on the Switch, page 7-51
• Configuring BPDU Skewing on the Switch, page 7-59
• Configuring Layer 2 PDU Rate Limiting on the Switch, page 7-61
Note For complete syntax and usage information for the commands that are used in this chapter, refer to the
Catalyst 6500 Series Switch Command Reference publication.
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