1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.0 Module 8 Virtual LANs

222 © 2003, 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 3.0. 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.

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444 © 2003, Cisco Systems, Inc. All rights reserved. Objectives VLAN concepts VLAN configuration Troubleshooting VLANs

555 © 2003, Cisco Systems, Inc. All rights reserved. Introduction to VLANs

666 © 2003, Cisco Systems, Inc. All rights reserved. VLANs VLANs logically segment switched networks based on an organization's functions, project teams, or applications as opposed to a physical or geographical basis.

777 © 2003, Cisco Systems, Inc. All rights reserved. Broadcast Domains

888 © 2003, Cisco Systems, Inc. All rights reserved. Example with 3 Broadcast Domains, 3 VLANs

999 © 2003, Cisco Systems, Inc. All rights reserved. Static VLANs

10 © 2003, Cisco Systems, Inc. All rights reserved. Dynamic VLANs

11 © 2003, Cisco Systems, Inc. All rights reserved. Port-Centric VLANs

12 © 2003, Cisco Systems, Inc. All rights reserved. VLAN Configuration

13 © 2003, Cisco Systems, Inc. All rights reserved. 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

14 © 2003, Cisco Systems, Inc. All rights reserved. Communicating Between VLANs

15 © 2003, Cisco Systems, Inc. All rights reserved. VLAN Types

16 © 2003, Cisco Systems, Inc. All rights reserved. Inter-Switch Link

17 © 2003, Cisco Systems, Inc. All rights reserved. Concurrent Transmissions in a Switch

18 © 2003, Cisco Systems, Inc. All rights reserved. End-to-End VLANs

19 © 2003, Cisco Systems, Inc. All rights reserved. Static VLANs Static VLANs work well in networks where the following is true: Moves are controlled and managed. There is robust VLAN management software to configure the ports. It is not desirable to assume the additional overhead required when maintaining end- station MAC addresses and custom filtering tables.

20 © 2003, Cisco Systems, Inc. All rights reserved. Verifying VLAN Configuration

21 © 2003, Cisco Systems, Inc. All rights reserved. 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.

22 © 2003, Cisco Systems, Inc. All rights reserved. Deleting VLANs

23 © 2003, Cisco Systems, Inc. All rights reserved. VLAN Problem Isolation

24 © 2003, Cisco Systems, Inc. All rights reserved. Problem Isolation in Catalyst Networks

25 © 2003, Cisco Systems, Inc. All rights reserved. Preventing Broadcast Storms

26 © 2003, Cisco Systems, Inc. All rights reserved. Common Problems in Troubleshooting VLANs

27 © 2003, Cisco Systems, Inc. All rights reserved. Catalyst IOS show vlan Command

28 © 2003, Cisco Systems, Inc. All rights reserved. Catalyst IOS Keyword Syntax Description

29 © 2003, Cisco Systems, Inc. All rights reserved. Catalyst IOS show spanning-tree Command

30 © 2003, Cisco Systems, Inc. All rights reserved. VLAN Troubleshooting Scenarios A trunk link cannot be established between a switch and a router

31 © 2003, Cisco Systems, Inc. All rights reserved. VLAN Troubleshooting Scenarios VTP is not properly propagating VLAN configuration changes.

32 © 2003, Cisco Systems, Inc. All rights reserved. VLAN Troubleshooting Scenarios Dropped packets and loops