Contents
xvii
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Bridge ID, Switch Priority, and Extended System ID 18-4
Spanning-Tree Interface States 18-5
Blocking State 18-7
Listening State 18-7
Learning State 18-7
Forwarding State 18-7
Disabled State 18-8
How a Switch or Port Becomes the Root Switch or Root Port 18-8
Spanning Tree and Redundant Connectivity 18-9
Spanning-Tree Address Management 18-9
Accelerated Aging to Retain Connectivity 18-9
Spanning-Tree Modes and Protocols 18-10
Supported Spanning-Tree Instances 18-10
Spanning-Tree Interoperability and Backward Compatibility 18-11
STP and IEEE 802.1Q Trunks 18-11
VLAN-Bridge Spanning Tree 18-11
Spanning Tree and Switch Stacks 18-12
Configuring Spanning-Tree Features 18-12
Default Spanning-Tree Configuration 18-13
Spanning-Tree Configuration Guidelines 18-13
Changing the Spanning-Tree Mode. 18-15
Disabling Spanning Tree 18-16
Configuring the Root Switch 18-16
Configuring a Secondary Root Switch 18-18
Configuring Port Priority 18-18
Configuring Path Cost 18-20
Configuring the Switch Priority of a VLAN 18-21
Configuring Spanning-Tree Timers 18-22
Configuring the Hello Time 18-22
Configuring the Forwarding-Delay Time for a VLAN 18-23
Configuring the Maximum-Aging Time for a VLAN 18-23
Configuring the Transmit Hold-Count 18-24
Displaying the Spanning-Tree Status 18-24
