Cabletron Systems 802.1Q User Manual
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802.1Q VLAN

User’s Guide

9032599-02

NOTICE

Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made.

The hardware, firmware, or software described in this manual is subject to change without notice.

IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL, INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH DAMAGES.

1999 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005All Rights Reserved

Printed in the United States of America

Order Number: 9032599-02February 1999

Cabletron Systems andSECUREFAST are registered trademarks andSMARTSWITCH is a trademark of Cabletron Systems, Inc.

All other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies.

802.1Q VLAN User’s Guide

i

Notice

ii

802.1Q VLAN User’s Guide

CONTENTS

Figures ....................................................................................................

 

vii

Tables.....................................................................................................

 

viii

PREFACE

 

 

 

Using This Guide ............................................................................

ix

 

Structure of This Guide...................................................................

ix

 

Related Documents .........................................................................

x

 

Document Conventions ...................................................................

x

CHAPTER 1

VIRTUAL LOCAL AREA NETWORKS

 

1.1

Defining VLANs ...........................................................................

1-1

1.2

Types of VLANs...........................................................................

1-3

 

1.2.1

802.1Q VLANs................................................................

1-3

 

1.2.2

SecureFast VLANs .........................................................

1-3

 

1.2.3

Other VLAN Strategies ...................................................

1-3

1.3

Benefits and Restrictions.............................................................

1-4

1.4

VLAN Terms ................................................................................

1-4

1.5

Getting Help.................................................................................

1-7

CHAPTER 2

VLAN OPERATION

 

2.1

Description...................................................................................

2-1

2.2

VLAN Components......................................................................

2-1

2.3

Configuration Process .................................................................

2-2

 

2.3.1

Defining a VLAN .............................................................

2-2

 

2.3.2 Classifying Frames to a VLAN ........................................

2-2

 

2.3.3 Customizing the VLAN Forwarding List ..........................

2-3

2.4

VLAN Switch Operation...............................................................

2-3

 

2.4.1 Receiving Frames from VLAN Ports ...............................

2-4

 

2.4.2

Forwarding Decisions .....................................................

2-5

 

 

2.4.2.1 Broadcasts, Multicasts, and Unknown

 

 

 

Unicasts..........................................................

2-5

 

 

2.4.2.2 Known Unicasts..............................................

2-5

2.5

GARP Switch Operation ..............................................................

2-6

802.1Q VLAN User’s Guide

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Contents

CHAPTER 3

VLAN CONFIGURATION

 

3.1

Managing the Switch....................................................................

3-1

 

3.1.1

Switch Without VLANs ....................................................

3-1

 

3.1.2

Switch with VLANs ..........................................................

3-2

3.2

Summary of VLAN Local Management........................................

3-4

 

3.2.1 Preparing for VLAN Configuration...................................

3-4

3.3

802.1Q VLAN Configuration Menu Screen ..................................

3-5

3.4

Device VLAN Configuration Screen.............................................

3-8

 

3.4.1

Defining a VLAN............................................................

3-10

 

3.4.2 Changing the VLAN to FID Association ........................

3-11

 

3.4.3

Renaming a VLAN.........................................................

3-11

 

3.4.4

Deleting a VLAN............................................................

3-12

 

3.4.5

Enabling VLANs ............................................................

3-12

 

3.4.6

Disabling VLANs ...........................................................

3-12

 

3.4.7 Changing the Forwarding Mode ....................................

3-13

 

3.4.8 Paging Through the VLAN List......................................

3-13

3.5

Port Assignment Configuration Screen......................................

3-14

 

3.5.1 Changing the Port Mode ...............................................

3-15

 

3.5.2 Assigning a VLAN ID.....................................................

3-16

 

3.5.3 Paging Through the Port List.........................................

3-17

3.6

Port Filtering Configuration Screen............................................

3-17

 

3.6.1 Displaying VLAN IDs Associated with a Port ................

3-19

 

3.6.2 Selecting the Type of Filtering for a Port .......................

3-20

3.7

VLAN Forwarding Configuration Screen....................................

3-21

 

3.7.1 Viewing Current VLAN Ports .........................................

3-22

 

3.7.2 Paging Through VLAN Forwarding List Entries.............

3-23

 

3.7.3 Adding Forwarding List Entries .....................................

3-23

 

3.7.4 Deleting Forwarding List Entries ...................................

3-23

 

3.7.5 Changing the Frame Format .........................................

3-24

3.8

Protocol VLAN Configuration Screen.........................................

3-24

 

3.8.1 Displaying the Current Protocol, VLAN ID, and

 

 

 

Port Assignments ..........................................................

3-28

 

3.8.2 Assigning a Protocol Family to a VLAN ID ....................

3-28

 

3.8.3 Displaying the Protocol Types on Current Ports ...........

3-30

3.9

Protocol Ports Configuration Screen..........................................

3-31

 

3.9.1 Adding/Deleting Ports Associated with a VLAN ID........

3-33

3.10

Quick VLAN Walkthrough ..........................................................

3-33

iv

802.1Q VLAN User’s Guide

 

 

Contents

CHAPTER 4

EXAMPLES

 

4.1

Example 1, Single Switch Operation ...........................................

4-1

 

4.1.1

Solving the Problem........................................................

4-2

 

4.1.2

Frame Handling ..............................................................

4-3

4.2

Example 2, VLANs Across Multiple Switches..............................

4-4

 

4.2.1

Solving the Problem........................................................

4-5

 

4.2.2

Frame Handling ..............................................................

4-8

4.3

Example 3, 1D Trunk Connection to 802.1Q VLAN Network ....

4-10

 

4.3.1

Solving the Problem......................................................

4-12

 

4.3.2

Frame Handling ............................................................

4-13

4.4

Example 4, Isolating Network Traffic According to Protocol......

4-17

 

4.4.1

Solving the Problem......................................................

4-18

802.1Q VLAN User’s Guide

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Contents

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802.1Q VLAN User’s Guide