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1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 8 Virtual LANs

1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 8 Virtual LANs

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Page 1: 1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 8 Virtual LANs

1© 2004, Cisco Systems, Inc. All rights reserved.

CCNA 3 v3.1 Module 8 Virtual LANs

Page 2: 1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 8 Virtual LANs

222© 2004, Cisco Systems, Inc. All rights reserved.

Purpose of This PowerPoint

• This PowerPoint primarily consists of the Target Indicators (TIs) of this module in CCNA version 3.1.

• It was created to give instructors a PowerPoint to take and modify as their own.

• This PowerPoint is:

NOT a study guide for the module final assessment.

NOT a study guide for the CCNA certification exam.

• Please report any mistakes you find in this PowerPoint by using the Academy Connection Help link.

Page 3: 1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 8 Virtual LANs

333© 2004, Cisco Systems, Inc. All rights reserved.

To Locate Instructional Resource Materials on Academy Connection:

• Go to the Community FTP Center to locate materials created by the instructor community

• Go to the Tools section

• Go to the Alpha Preview section

• Go to the Community link under Resources

• See the resources available on the Class home page for classes you are offering

• Search http://www.cisco.com

• Contact your parent academy!

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Objectives

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Introduction to VLANs

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VLANs

VLANs logically segment switched networks based on an organization's functions, project teams, or applications as opposed to a physical or geographical basis.

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Broadcast Domains

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Example with 3 Broadcast Domains, 3 VLANs

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999© 2004, Cisco Systems, Inc. All rights reserved.

Static VLANs

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101010© 2004, Cisco Systems, Inc. All rights reserved.

Dynamic VLANs

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Port-Centric VLANs

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VLAN Configuration

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Benefits of VLANs

• Easily move workstations on the LAN

• Easily add workstations to the LAN

• Easily change the LAN configuration

• Easily control network traffic

• Improve security

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Communicating Between VLANs

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VLAN Types

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Inter-Switch Link

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Concurrent Transmissions in a Switch

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End-to-End VLANs

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Static VLANs

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202020© 2004, Cisco Systems, Inc. All rights reserved.

Verifying VLAN Configuration

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Saving VLAN Configuration

Back up using the copy running-config tftp command, or you can use the HyperTerminal Capture Text feature to store the configuration settings.

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VLAN Problem Isolation

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Problem Isolation in Catalyst Networks

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242424© 2004, Cisco Systems, Inc. All rights reserved.

Preventing Broadcast Storms

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Common Problems in Troubleshooting VLANs

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Catalyst IOS show vlan Command

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Catalyst IOS Keyword Syntax Description

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Catalyst IOS show spanning-tree Command

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VLAN Troubleshooting Scenarios

A trunk link cannot be established between a switch and a router

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VLAN Troubleshooting Scenarios

VTP is not properly propagating VLAN configuration changes.

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VLAN Troubleshooting Scenarios

Dropped packets and loops

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Summary