Understanding Spanning-Tree Features; Configuring Stp - Cisco Catalyst 3560-X Software Configuration Manual

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This chapter describes how to configure the Spanning Tree Protocol (STP) on port-based VLANs on the

Catalyst 3750-X or 3560-X switch. The switch can use either the per-VLAN spanning-tree plus (PVST+)

protocol based on the IEEE 802.1D standard and Cisco proprietary extensions, or the rapid per-VLAN

spanning-tree plus (rapid-PVST+) protocol based on the IEEE 802.1w standard. A switch stack appears

as a single spanning-tree node to the rest of the network, and all stack members use the same bridge ID.

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 about the Multiple Spanning Tree Protocol (MSTP) and how to map multiple VLANs

to the same spanning-tree instance, see

spanning-tree features such as Port Fast, UplinkFast, root guard, and so forth, see

"Configuring Optional Spanning-Tree Features."

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 Spanning-Tree Features

These sections contain this conceptual information:

Understanding Spanning-Tree Features, page 1-1

Configuring Spanning-Tree Features, page 1-13

Displaying the Spanning-Tree Status, page 1-25

STP Overview, page 1-2

Spanning-Tree Topology and BPDUs, page 1-3

Bridge ID, Switch Priority, and Extended System ID, page 1-5

Spanning-Tree Interface States, page 1-5

How a Switch or Port Becomes the Root Switch or Root Port, page 1-8

Spanning Tree and Redundant Connectivity, page 1-9

Spanning-Tree Address Management, page 1-9

Accelerated Aging to Retain Connectivity, page 1-9

C H A P T E R

Chapter 1, "Configuring MSTP."

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

For information about other

Catalyst 3750-x