Specifications

Contents
xi
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Using the Interface Command 11-4
Procedures for Configuring Interfaces 11-5
Configuring a Range of Interfaces 11-6
Configuring and Using Interface-Range Macros 11-8
Configuring Switch Interfaces 11-9
Default Ethernet Interface Configuration 11-10
Configuring Interface Speed and Duplex Mode 11-11
Configuration Guidelines 11-11
Setting the Interface Speed and Duplex Parameters 11-12
Configuring IEEE 802.3X Flow Control on Gigabit Ethernet Ports 11-13
Adding a Description for an Interface 11-15
Monitoring and Maintaining the Interfaces 11-15
Monitoring Interface and Controller Status 11-15
Clearing and Resetting Interfaces and Counters 11-17
Shutting Down and Restarting the Interface 11-18
CHAPTER 12 Configuring STP 12-1
Understanding Spanning-Tree Features 12-1
STP Overview 12-2
Supported Spanning-Tree Instances 12-2
Bridge Protocol Data Units 12-2
Election of the Root Switch 12-3
Bridge ID, Switch Priority, and Extended System ID 12-4
Spanning-Tree Timers 12-5
Creating the Spanning-Tree Topology 12-5
Spanning-Tree Interface States 12-6
Blocking State 12-7
Listening State 12-7
Learning State 12-7
Forwarding State 12-8
Disabled State 12-8
Spanning-Tree Address Management 12-8
STP and IEEE 802.1Q Trunks 12-8
Spanning Tree and Redundant Connectivity 12-9
Accelerated Aging to Retain Connectivity 12-9
Configuring Spanning-Tree Features 12-10
Default STP Configuration 12-10
STP Configuration Guidelines 12-11
Disabling STP 12-11