Cisco Gigabit Ethernet Switch Module for HP p-Class BladeSystem Software Configuration Guide

Contents

xii

380261-003

CHAPTER

12 Configuring STP 12-1

Understanding Spanning-Tree Features 12-1

STP Overview 12-2

Spanning-Tree Topology and BPDUs 12-3

Bridge ID, Switch Priority, and Extended System ID 12-4

Spanning-Tree Interface States 12-4

Blocking State 12-6

Listening State 12-6

Learning State 12-6

Forwarding State 12-6

Disabled State 12-7

How a Switch or Port Becomes the Root Switch or Root Port 12-7

Spanning Tree and Redundant Connectivity 12-8

Spanning-Tree Address Management 12-8

Accelerated Aging to Retain Connectivity 12-8

Spanning-Tree Modes and Protocols 12-9

Supported Spanning-Tree Instances 12-9

Spanning-Tree Interoperability and Backward Compatibility 12-10

STP and IEEE 802.1Q Trunks 12-10

Configuring Spanning-Tree Features 12-10

Default Spanning-Tree Configuration 12-11

Spanning-Tree Configuration Guidelines 12-12

Changing the Spanning-Tree Mode. 12-13

Disabling Spanning Tree 12-14

Configuring the Root Switch 12-14

Configuring a Secondary Root Switch 12-16

Configuring Port Priority 12-16

Configuring Path Cost 12-18

Configuring the Switch Priority of a VLAN 12-19

Configuring Spanning-Tree Timers 12-20

Configuring the Hello Time 12-20

Configuring the Forwarding-Delay Time for a VLAN 12-21

Configuring the Maximum-Aging Time for a VLAN 12-21

Configuring the Transmit Hold-Count 12-22

Displaying the Spanning-Tree Status 12-22