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

Contents

xiii

380261-003

CHAPTER

13 Configuring MSTP 13-1

Understanding MSTP 13-2

Multiple Spanning-Tree Regions 13-2

IST, CIST, and CST 13-3

Operations Within an MST Region 13-3

Operations Between MST Regions 13-4

IEEE 802.1s Terminology 13-5

Hop Count 13-5

Boundary Ports 13-6

IEEE 802.1s Implementation 13-6

Port Role Naming Change 13-7

Interoperation Between Legacy and Standard Switches 13-7

Detecting Unidirectional Link Failure 13-8

Interoperability with IEEE 802.1D STP 13-8

Understanding RSTP 13-8

Port Roles and the Active Topology 13-9

Rapid Convergence 13-10

Synchronization of Port Roles 13-11

Bridge Protocol Data Unit Format and Processing 13-12

Processing Superior BPDU Information 13-13

Processing Inferior BPDU Information 13-13

Topology Changes 13-13

Configuring MSTP Features 13-14

Default MSTP Configuration 13-14

MSTP Configuration Guidelines 13-15

Specifying the MST Region Configuration and Enabling MSTP 13-16

Configuring the Root Switch 13-17

Configuring a Secondary Root Switch 13-18

Configuring Port Priority 13-19

Configuring Path Cost 13-20

Configuring the Switch Priority 13-21

Configuring the Hello Time 13-22

Configuring the Forwarding-Delay Time 13-23

Configuring the Maximum-Aging Time 13-23

Configuring the Maximum-Hop Count 13-24

Specifying the Link Type to Ensure Rapid Transitions 13-24

Designating the Neighbor Type 13-25

Restarting the Protocol Migration Process 13-25

Displaying the MST Configuration and Status 13-26