Cisco Systems 3750E manual Boundary Ports, Xviii

Contents

C H A P T E R 19	Configuring MSTP	19-1
	Understanding MSTP		19-2
	Multiple Spanning-Tree Regions 19-2
	IST, CIST, and CST		19-3
	Operations Within an MST Region					19-3
	Operations Between MST Regions					19-4
	IEEE 802.1s Terminology			19-5
	Hop Count	19-5
	Boundary Ports 19-6
	IEEE 802.1s Implementation			19-6
	Port Role Naming Change			19-7
	Interoperation Between Legacy and Standard Switches 19-7
	Detecting Unidirectional Link Failure					19-8
	MSTP and Switch Stacks 19-8
	Interoperability with IEEE 802.1D STP				19-9
	Understanding RSTP		19-9
	Port Roles and the Active Topology				19-9
	Rapid Convergence 19-10
	Synchronization of Port Roles			19-11

Bridge Protocol Data Unit Format and Processing 19-12

Processing Superior BPDU Information	19-13
Processing Inferior BPDU Information	19-13
Topology Changes 19-13
Configuring MSTP Features 19-14
Default MSTP Configuration 19-15

MSTP Configuration Guidelines			19-15
Specifying the MST Region Configuration and Enabling MSTP 19-16
Configuring the Root Switch		19-17
Configuring a Secondary Root Switch				19-19
Configuring Port Priority	19-20
Configuring Path Cost	19-21
Configuring the Switch Priority			19-22
Configuring the Hello Time		19-22
Configuring the Forwarding-Delay Time				19-23
Configuring the Maximum-Aging Time				19-24
Configuring the Maximum-Hop Count				19-24

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

xviii OL-9775-02