1 © 2004, Cisco Systems, Inc. All rights reserved. CCNA 3 v3.1 Module 8 Virtual LANs
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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.
333© 2004, Cisco Systems, Inc. All rights reserved.
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• Go to the Community FTP Center to locate materials created by the instructor community
• Go to the Tools section
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• 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!
444© 2004, Cisco Systems, Inc. All rights reserved.
Objectives
555© 2004, Cisco Systems, Inc. All rights reserved.
Introduction to VLANs
666© 2004, 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© 2004, Cisco Systems, Inc. All rights reserved.
Broadcast Domains
888© 2004, Cisco Systems, Inc. All rights reserved.
Example with 3 Broadcast Domains, 3 VLANs
999© 2004, Cisco Systems, Inc. All rights reserved.
Static VLANs
101010© 2004, Cisco Systems, Inc. All rights reserved.
Dynamic VLANs
111111© 2004, Cisco Systems, Inc. All rights reserved.
Port-Centric VLANs
121212© 2004, Cisco Systems, Inc. All rights reserved.
VLAN Configuration
131313© 2004, 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
141414© 2004, Cisco Systems, Inc. All rights reserved.
Communicating Between VLANs
151515© 2004, Cisco Systems, Inc. All rights reserved.
VLAN Types
161616© 2004, Cisco Systems, Inc. All rights reserved.
Inter-Switch Link
171717© 2004, Cisco Systems, Inc. All rights reserved.
Concurrent Transmissions in a Switch
181818© 2004, Cisco Systems, Inc. All rights reserved.
End-to-End VLANs
191919© 2004, Cisco Systems, Inc. All rights reserved.
Static VLANs
202020© 2004, Cisco Systems, Inc. All rights reserved.
Verifying VLAN Configuration
212121© 2004, 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.
222222© 2004, Cisco Systems, Inc. All rights reserved.
VLAN Problem Isolation
232323© 2004, Cisco Systems, Inc. All rights reserved.
Problem Isolation in Catalyst Networks
242424© 2004, Cisco Systems, Inc. All rights reserved.
Preventing Broadcast Storms
252525© 2004, Cisco Systems, Inc. All rights reserved.
Common Problems in Troubleshooting VLANs
262626© 2004, Cisco Systems, Inc. All rights reserved.
Catalyst IOS show vlan Command
272727© 2004, Cisco Systems, Inc. All rights reserved.
Catalyst IOS Keyword Syntax Description
282828© 2004, Cisco Systems, Inc. All rights reserved.
Catalyst IOS show spanning-tree Command
292929© 2004, Cisco Systems, Inc. All rights reserved.
VLAN Troubleshooting Scenarios
A trunk link cannot be established between a switch and a router
303030© 2004, Cisco Systems, Inc. All rights reserved.
VLAN Troubleshooting Scenarios
VTP is not properly propagating VLAN configuration changes.
313131© 2004, Cisco Systems, Inc. All rights reserved.
VLAN Troubleshooting Scenarios
Dropped packets and loops
323232© 2004, Cisco Systems, Inc. All rights reserved.
Summary
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