Specifications

Contents
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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-07
Configuring the Root Switch 12-12
Configuring a Secondary Root Switch 12-14
Configuring the Port Priority 12-15
Configuring the Path Cost 12-16
Configuring the Switch Priority of a VLAN 12-18
Configuring the Hello Time 12-18
Configuring the Forwarding-Delay Time for a VLAN 12-19
Configuring the Maximum-Aging Time for a VLAN 12-20
Configuring STP for Use in a Cascaded Stack 12-20
Displaying the Spanning-Tree Status 12-21
CHAPTER 13 Configuring RSTP and MSTP 13-1
Understanding RSTP 13-2
Spanning-Tree Instances Using RSTP 13-2
Port Roles and the Active Topology 13-2
Rapid Convergence 13-3
Synchronization of Port Roles 13-4
Bridge Protocol Data Unit Format and Processing 13-5
Processing Superior BPDU Information 13-6
Processing Inferior BPDU Information 13-6
Topology Changes 13-6
Understanding MSTP 13-7
Multiple Spanning-Tree Regions 13-7
IST, CIST, and CST 13-8
Operations Within an MST Region 13-8
Operations Between MST Regions 13-9
Hop Count 13-10
Boundary Ports 13-10
Interoperability with 802.1D STP 13-11
Configuring RSTP and MSTP Features 13-11
Default RSTP and MSTP Configuration 13-12
RSTP and MSTP Configuration Guidelines 13-12
Specifying the MST Region Configuration and Enabling MSTP 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 13-19
Configuring the Hello Time 13-19