Understanding Optional Spanning-Tree Features - Cisco 2950 - Catalyst Switch Configuration Manual

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
information about the Multiple Spanning Tree Protocol (MSTP) and how to map multiple VLANs to the
same spanning-tree instance, see
For complete syntax and usage information for the commands used in this chapter, refer to the command
Note
reference for this release.
This chapter consists of these sections:
•
•
•

Understanding Optional Spanning-Tree Features

These sections describe how the optional spanning-tree features work:
•
•
•
•
•
•
•
•
•
78-11380-10
Understanding Optional Spanning-Tree Features, page 16-1
Configuring Optional Spanning-Tree Features, page 16-12
Displaying the Spanning-Tree Status, page 16-20
Understanding Port Fast, page 16-2
Understanding BPDU Guard, page 16-2
Understanding BPDU Filtering, page 16-3
Understanding UplinkFast, page 16-3
Understanding Cross-Stack UplinkFast, page 16-5
Understanding BackboneFast, page 16-9
Understanding EtherChannel Guard, page 16-11
Understanding Root Guard, page 16-11
Understanding Loop Guard, page 16-12
Chapter 15, "Configuring MSTP."
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
C H A P T E R
Chapter 14, "Configuring STP."
16
For
16-1