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CHAPTER
15-1
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
15
Configuring Optional Spanning-Tree Features
This chapter describes how to configure optional spanning-tree features on your Catalyst 2950 or
Catalyst 2955 switch. You can configure all of these features when your switch is running the per-VLAN
spanning-tree plus (PVST+). You can configure only the noted features when your switch is running the
Multiple Spanning Tree Protocol (MSTP) or the rapid per-VLAN spanning-tree plus (rapid-PVST+)
protocol.
For information on configuring the PVST+ and rapid PVST+, see Chapter 13, “Configuring STP.” For
information about the Multiple Spanning Tree Protocol (MSTP) and how to map multiple VLANs to the
same spanning-tree instance, see
Chapter 14, “Configuring MSTP.”
Note For complete syntax and usage information for the commands used in this chapter, see the command
reference for this release.
This chapter consists of these sections:
• Understanding Optional Spanning-Tree Features, page 15-1
• Configuring Optional Spanning-Tree Features, page 15-13
• Displaying the Spanning-Tree Status, page 15-21
Understanding Optional Spanning-Tree Features
These sections describe how the optional spanning-tree features work:
• Understanding Port Fast, page 15-2
• Understanding BPDU Guard, page 15-2
• Understanding BPDU Filtering, page 15-3
• Understanding UplinkFast, page 15-3
• Understanding Cross-Stack UplinkFast, page 15-5
• Understanding BackboneFast, page 15-9
• Understanding EtherChannel Guard, page 15-11
• Understanding Root Guard, page 15-12
• Understanding Loop Guard, page 15-13