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Contents
xvii
Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
Voice VLAN Configuration Guidelines 15-3
Configuring a Port Connected to a Cisco 7960 IP Phone 15-4
Configuring Cisco IP Phone Voice Traffic 15-5
Configuring the Priority of Incoming Data Frames 15-6
Displaying Voice VLAN 15-7
CHAPTER
16 Configuring STP 16-1
Understanding Spanning-Tree Features 16-1
STP Overview 16-2
Spanning-Tree Topology and BPDUs 16-3
Bridge ID, Switch Priority, and Extended System ID 16-4
Spanning-Tree Interface States 16-5
Blocking State 16-6
Listening State 16-7
Learning State 16-7
Forwarding State 16-7
Disabled State 16-7
How a Switch or Port Becomes the Root Switch or Root Port 16-8
Spanning Tree and Redundant Connectivity 16-8
Spanning-Tree Address Management 16-9
Accelerated Aging to Retain Connectivity 16-9
Spanning-Tree Modes and Protocols 16-10
Supported Spanning-Tree Instances 16-10
Spanning-Tree Interoperability and Backward Compatibility 16-11
STP and IEEE 802.1Q Trunks 16-11
Spanning Tree and Switch Stacks 16-12
Configuring Spanning-Tree Features 16-12
Default Spanning-Tree Configuration 16-13
Spanning-Tree Configuration Guidelines 16-13
Changing the Spanning-Tree Mode 16-15
Disabling Spanning Tree 16-16
Configuring the Root Switch 16-16
Configuring a Secondary Root Switch 16-18
Configuring Port Priority 16-18
Configuring Path Cost 16-20
Configuring the Switch Priority of a VLAN 16-21
Configuring Spanning-Tree Timers 16-22
Configuring the Hello Time 16-22
Configuring the Forwarding-Delay Time for a VLAN 16-23