Understanding Optional Spanning-Tree Features - Cisco Catalyst 3750-X Software Configuration Manual

Configuring Optional Spanning-Tree Features
This chapter describes how to configure optional spanning-tree features on the Catalyst 3750-X or
3560-X 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 or 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 Catalyst 3750-X or 3560-X
standalone switch and to a Catalyst 3750-X 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, see the command
Note
reference for this release.
This chapter consists of these sections:
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Understanding Optional Spanning-Tree Features

These sections contain this conceptual information:
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OL-21521-01
Understanding Optional Spanning-Tree Features, page 22-1
Configuring Optional Spanning-Tree Features, page 22-11
Displaying the Spanning-Tree Status, page 22-19
Understanding Port Fast, page 22-2
Understanding BPDU Guard, page 22-2
Understanding BPDU Filtering, page 22-3
Understanding UplinkFast, page 22-3
Understanding Cross-Stack UplinkFast, page 22-5
Understanding BackboneFast, page 22-7
Understanding EtherChannel Guard, page 22-10
Understanding Root Guard, page 22-10
Understanding Loop Guard, page 22-11
C H A P T E R
Chapter 21, "Configuring MSTP."
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
22
Chapter 20, "Configuring STP." For
22-1