vlans

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CCNA 3 Chapter 9

Virtual LANs

By

Your Name

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Objectives

• VLAN concepts

• VLAN configuration

• Troubleshooting VLANs

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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 with VLANs and Routers

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Broadcast Domains

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Static VLANs

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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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VLAN Types

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VLAN Tagging

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Communicating Between VLANs

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VLAN Configuration

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Concurrent Transmission

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End-to-End VLANs

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Static VLANs

• 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.

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Verifying VLAN Configuration

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Saving a 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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Deleting VLANs

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Troubleshooting VLANs

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VLAN Problem Isolation

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Problem Isolation in Catalyst Networks

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Preventing Broadcast Storms

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Troubleshooting VLANs

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Keyword Syntax

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The show Commands

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VLAN Troubleshooting Scenarios

Cannot establish a trunk link 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