Contents
xiv
Catalyst 3560 Switch Software Configuration Guide
78-16156-01
CHAPTER
15 Configuring STP 15-1
Understanding Spanning-Tree Features 15-1
STP Overview 15-2
Spanning-Tree Topology and BPDUs 15-3
Bridge ID, Switch Priority, and Extended System ID 15-4
Spanning-Tree Interface States 15-4
Blocking State 15-6
Listening State 15-6
Learning State 15-6
Forwarding State 15-6
Disabled State 15-7
How a Switch or Port Becomes the Root Switch or Root Port 15-7
Spanning Tree and Redundant Connectivity 15-8
Spanning-Tree Address Management 15-8
Accelerated Aging to Retain Connectivity 15-8
Spanning-Tree Modes and Protocols 15-9
Supported Spanning-Tree Instances 15-9
Spanning-Tree Interoperability and Backward Compatibility 15-10
STP and IEEE 802.1Q Trunks 15-10
VLAN-Bridge Spanning Tree 15-11
Configuring Spanning-Tree Features 15-11
Default Spanning-Tree Configuration 15-11
Spanning-Tree Configuration Guidelines 15-12
Changing the Spanning-Tree Mode 15-13
Disabling Spanning Tree 15-14
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 of a VLAN 15-19
Configuring Spanning-Tree Timers 15-20
Configuring the Hello Time 15-20
Configuring the Forwarding-Delay Time for a VLAN 15-21
Configuring the Maximum-Aging Time for a VLAN 15-21
Displaying the Spanning-Tree Status 15-22
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