Specifications

Contents
xiv
Catalyst 2970 Switch Software Configuration Guide
78-15462-03
Operations Within an MST Region 15-3
Operations Between MST Regions 15-4
Hop Count 15-5
Boundary Ports 15-5
Interoperability with 802.1D STP 15-5
Understanding RSTP 15-6
Port Roles and the Active Topology 15-6
Rapid Convergence 15-7
Synchronization of Port Roles 15-8
Bridge Protocol Data Unit Format and Processing 15-9
Processing Superior BPDU Information 15-10
Processing Inferior BPDU Information 15-10
Topology Changes 15-10
Configuring MSTP Features 15-11
Default MSTP Configuration 15-12
MSTP Configuration Guidelines 15-12
Specifying the MST Region Configuration and Enabling MSTP 15-13
Configuring the Root Switch 15-14
Configuring a Secondary Root Switch 15-16
Configuring Port Priority 15-17
Configuring Path Cost 15-18
Configuring the Switch Priority 15-19
Configuring the Hello Time 15-19
Configuring the Forwarding-Delay Time 15-20
Configuring the Maximum-Aging Time 15-21
Configuring the Maximum-Hop Count 15-21
Specifying the Link Type to Ensure Rapid Transitions 15-22
Restarting the Protocol Migration Process 15-22
Displaying the MST Configuration and Status 15-23
CHAPTER 16 Configuring Optional Spanning-Tree Features 16-1
Understanding Optional Spanning-Tree Features 16-1
Understanding Port Fast 16-2
Understanding BPDU Guard 16-3
Understanding BPDU Filtering 16-3
Understanding UplinkFast 16-4
Understanding BackboneFast 16-5
Understanding Root Guard 16-7
Understanding Loop Guard 16-8