Understanding Optional Spanning-Tree Features - Cisco WS-C3750-48PS-S Software Configuration Manual

Configuring Optional Spanning-Tree Features
This chapter describes how to configure optional spanning-tree features on the Catalyst 3750 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 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.
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:
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Understanding Optional Spanning-Tree Features

These sections describe how the optional spanning-tree features work:
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78-16180-02
Understanding Optional Spanning-Tree Features, page 19-1
Configuring Optional Spanning-Tree Features, page 19-11
Displaying the Spanning-Tree Status, page 19-19
Understanding Port Fast, page 19-2
Understanding BPDU Guard, page 19-3
Understanding BPDU Filtering, page 19-3
Understanding UplinkFast, page 19-4
Understanding Cross-Stack UplinkFast, page 19-5
Understanding BackboneFast, page 19-7
Understanding EtherChannel Guard, page 19-10
Understanding Root Guard, page 19-10
Understanding Loop Guard, page 19-11
Chapter 18, "Configuring MSTP."
Catalyst 3750 Switch Software Configuration Guide
C H A P T E R
Chapter 17, "Configuring STP."
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