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CHAPTER
18-1
Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
18
Configuring Optional Spanning-Tree Features
This chapter describes how to configure optional spanning-tree features on the Catalyst 2960 and 2960-S
switches. 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 stack is
running the Multiple Spanning Tree Protocol (MSTP) or the rapid per-VLAN spanning-tree plus
(rapid-PVST+) protocol. Unless otherwise noted, the term switch refers to a standalone switch and to a
switch stack.
Note Stacking is supported only on Catalyst 2960-S switches running the LAN base image.
For information on configuring the PVST+ and rapid PVST+, see Chapter 16, “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 17, “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 18-1
• Configuring Optional Spanning-Tree Features, page 18-12
• Displaying the Spanning-Tree Status, page 18-20
Understanding Optional Spanning-Tree Features
These sections contain this conceptual information:
• Understanding Port Fast, page 18-2
• Understanding BPDU Guard, page 18-2
• Understanding BPDU Filtering, page 18-3
• Understanding UplinkFast, page 18-3
• Understanding BackboneFast, page 18-7
• Understanding EtherChannel Guard, page 18-10