Contents
xiii
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Configuring Spanning-Tree Features 13-10
Default Spanning-Tree Configuration 13-11
Spanning-Tree Configuration Guidelines 13-11
Changing the Spanning-Tree Mode 13-12
Disabling Spanning Tree 13-13
Configuring the Root Switch 13-14
Configuring a Secondary Root Switch 13-16
Configuring the Port Priority 13-17
Configuring the Path Cost 13-18
Configuring the Switch Priority of a VLAN 13-19
Configuring Spanning-Tree Timers 13-20
Configuring the Hello Time 13-20
Configuring the Forwarding-Delay Time for a VLAN 13-21
Configuring the Maximum-Aging Time for a VLAN 13-21
Configuring Spanning Tree for Use in a Cascaded Stack 13-22
Displaying the Spanning-Tree Status 13-23
CHAPTER
14 Configuring MSTP 14-1
Understanding MSTP 14-2
Multiple Spanning-Tree Regions 14-2
IST, CIST, and CST 14-2
Operations Within an MST Region 14-3
Operations Between MST Regions 14-3
Hop Count 14-4
Boundary Ports 14-5
Interoperability with IEEE 802.1D STP 14-5
Understanding RSTP 14-6
Port Roles and the Active Topology 14-6
Rapid Convergence 14-7
Synchronization of Port Roles 14-8
Bridge Protocol Data Unit Format and Processing 14-9
Processing Superior BPDU Information 14-10
Processing Inferior BPDU Information 14-10
Topology Changes 14-10
Configuring MSTP Features 14-11
Default MSTP Configuration 14-11
MSTP Configuration Guidelines 14-12
Specifying the MST Region Configuration and Enabling MSTP 14-13