Cisco ME 3400 - Page 14

Contents
xiv
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
CHAPTER 15 Configuring MSTP 15-1
Understanding MSTP 15-2
Multiple Spanning-Tree Regions 15-2
IST, CIST, and CST 15-2
Operations Within an MST Region 15-3
Operations Between MST Regions 15-3
IEEE 802.1s Terminology 15-5
Hop Count 15-5
Boundary Ports 15-6
IEEE 802.1s Implementation 15-6
Port Role Naming Change 15-7
Interoperation Between Legacy and Standard Switches 15-7
Detecting Unidirectional Link Failure 15-8
Interoperability with IEEE 802.1D STP 15-8
Understanding RSTP 15-8
Port Roles and the Active Topology 15-9
Rapid Convergence 15-10
Synchronization of Port Roles 15-11
Bridge Protocol Data Unit Format and Processing 15-12
Processing Superior BPDU Information 15-13
Processing Inferior BPDU Information 15-13
Topology Changes 15-13
Configuring MSTP Features 15-14
Default MSTP Configuration 15-14
MSTP Configuration Guidelines 15-15
Specifying the MST Region Configuration and Enabling MSTP 15-16
Configuring the Root Switch 15-17
Configuring a Secondary Root Switch 15-18
Configuring Port Priority 15-19
Configuring Path Cost 15-21
Configuring the Switch Priority 15-22
Configuring the Hello Time 15-23
Configuring the Forwarding-Delay Time 15-23
Configuring the Maximum-Aging Time 15-24
Configuring the Maximum-Hop Count 15-24
Specifying the Link Type to Ensure Rapid Transitions 15-25
Designating the Neighbor Type 15-25
Restarting the Protocol Migration Process 15-26
Displaying the MST Configuration and Status 15-27