Ethernet Switches
Charles E. Spurgeon and Joann Zimmerman
Ethernet Switches
by Charles E. Spurgeon and Joann Zimmerman
Copyright © 2013 Charles Spurgeon and Joann Zimmerman. All rights reserved.
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Editor:
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Proofreader:
Marisa LaFleur
April 2013:
First Edition
Cover Designer:
Randy Comer
Interior Designer:
David Futato
Illustrator:
Rebecca Demarest
Revision History for the First Edition:
2013-03-29:
First release
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ISBN: 978-1-449-36730-5
[LSI]
Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
1. Basic Switch Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What an Ethernet Switch Does
Bridges and Switches
What Is a Switch?
Operation of Ethernet Switches
Transparent Bridging
Address Learning
Traffic Filtering
Frame Flooding
Broadcast and Multicast Traffic
Combining Switches
Forwarding Loops
Spanning Tree Protocol
Spanning Tree Packets
Choosing a Root Bridge
Choosing the Least-Cost Path
Blocking Loop Paths
Spanning Tree Port States
Spanning Tree Versions
Switch Performance Issues
Packet Forwarding Performance
Switch Port Memory
Switch CPU and RAM
Switch Specifications
Switch Management
1
1
2
3
4
4
6
7
7
9
9
10
11
11
11
12
13
15
16
17
17
18
18
23
2. Basic Switch Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
iii
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