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CHAPTER
19-1
Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
19
Configuring Optional Spanning-Tree Features
This chapter describes how to configure optional spanning-tree features on the Catalyst 3560 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 17, “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 18, “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 19-1
• Configuring Optional Spanning-Tree Features, page 19-9
• Displaying the Spanning-Tree Status, page 19-16
Understanding Optional Spanning-Tree Features
These sections contain this conceptual information:
• Understanding Port Fast, page 19-2
• Understanding BPDU Guard, page 19-2
• Understanding BPDU Filtering, page 19-3
• Understanding UplinkFast, page 19-3
• Understanding BackboneFast, page 19-5
• Understanding EtherChannel Guard, page 19-7
• Understanding Root Guard, page 19-8
• Understanding Loop Guard, page 19-9