Transcript CCNA 3 Module 3 Single-Area OSPF

CCNA 3 Chapter 9
Virtual LANs
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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
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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 endstation 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
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