Contents
xiii
Cisco ME 3400 EthernetAccess Switch SoftwareConfiguration Guide
78-17058-01
Spanning-Tree Modes and Protocols 14-9
Supported Spanning-Tree Instances 14-10
Spanning-Tree Interoperability and Backward Compatibility 14-10
STP and IEEE 802.1Q Trunks 14-10
Configuring Spanning-Tree Features 14-11
Default Spanning-Tree Configuration 14-11
Spanning-Tree Configuration Guidelines 14-12
Changing the Spanning-Tree Mode. 14-13
Disabling Spanning Tree 14-14
Configuring the Root Switch 14-14
Configuring a Secondary Root Switch 14-16
Configuring Port Priority 14-16
Configuring Path Cost 14-18
Configuring the Switch Priority of a VLAN 14-19
Configuring Spanning-Tree Timers 14-20
Configuring the Hello Time 14-20
Configuring the Forwarding-Delay Time for a VLAN 14-21
Configuring the Maximum-Aging Time for a VLAN 14-21
Displaying the Spanning-Tree Status 14-22
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
Hop Count 15-4
Boundary Ports 15-5
Interoperability with IEEE 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