Contents
xviii
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
CHAPTER
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
