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CHAPTER
11-1
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
11
Configuring STP
This chapter describes how to configure the Spanning Tree Protocol (STP) on your switch.
For information about the Rapid Spanning Tree Protocol (RSTP) and the Multiple Spanning Tree
Protocol (MSTP), see Chapter 12, “Configuring RSTP and MSTP.” For information about optional
spanning-tree features, see Chapter 13, “Configuring Optional Spanning-Tree Features.”
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
This chapter consists of these sections:
• Understanding Spanning-Tree Features, page 11-1
• Configuring Spanning-Tree Features, page 11-9
• Displaying the Spanning-Tree Status, page 11-21
Understanding Spanning-Tree Features
These sections describe how spanning-tree features work:
• STP Overview, page 11-2
• Supported Spanning-Tree Instances, page 11-2
• Bridge Protocol Data Units, page 11-2
• Election of the Root Switch, page 11-3
• Bridge ID, Switch Priority, and Extended System ID, page 11-4
• Spanning-Tree Timers, page 11-4
• Creating the Spanning-Tree Topology, page 11-5
• Spanning-Tree Interface States, page 11-5
• Spanning-Tree Address Management, page 11-8
• STP and IEEE 802.1Q Trunks, page 11-8