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VLANs & VTP

VLANs & VTP. LAN Switching and Wireless – Chapter 3,4. Objectives. Explain the role of VLANs in a converged network. Explain the role of trunking VLANs in a converged network. Configure VLANs on the switches in a converged network topology.

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VLANs & VTP

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  1. VLANs & VTP LAN Switching and Wireless– Chapter 3,4

  2. Objectives • Explain the role of VLANs in a converged network. • Explain the role of trunking VLANs in a converged network. • Configure VLANs on the switches in a converged network topology. • Troubleshoot the common software or hardware misconfigurations associated with VLANs on switches in a converged network topology.

  3. Objectives • Explain the role of VTP in a converged switched network • Describe the operation of VTP: VTP domains, VTP Modes, VTP Advertisements, and VTP Pruning. • Configure VTP on the switches in a converged network.

  4. VLANs in a Converged Network

  5. Controlling Broadcast Domains with VLANs

  6. Trunking VLANs

  7. Trunking Operation

  8. VLAN Troubleshooting

  9. Native VLAN Mismatches

  10. Wrong IP Subnet

  11. VLANs Not Allowed on Trunk

  12. VTP – VLAN Trunking Protocol

  13. VTP Domains

  14. VTP Advertisements

  15. VTP Modes

  16. VTP Pruning • Prevents unnecessary broadcast traffic • E.g., broadcast packets from PC1

  17. Troubleshoot VTP problems • Incompatible VTP versions • VTP v1 and v2 are not compatible • VTP Password mismatches • Password must be set at each switch in the domain • Incorrect VTP domain name • All switches set to VTP client mode • Incorrect revision numbers

  18. Incorrect VTP domain name

  19. All Switches Are VTP Clients VTP Client All VLAN information will be gone after rebooting!

  20. Incorrect Revision Numbers

  21. Summary • VLANS Allows an administrator to logically group devices that act as their own network Are used to segment broadcast domains Some benefits of VLANs include Cost reduction, security, higher performance, better management

  22. Summary • Types of Traffic on a VLAN include • Data • Voice • Network protocol • Network management • Communication between different VLANs requires the use of • Routers

  23. Summary • Trunks A common conduit used by multiple VLANS for intra-VLAN communication • IEEE 802.1Q The standard trunking protocol Uses frame tagging to identify the VLAN to which a frame belongs Does not tag native VLAN traffic

  24. Summary • VTP is a Cisco proprietary protocol used to exchange VLAN information across trunk links. • A switch can be in one of 3 VTP operating modes • Client • Cannot create, modify or delete VLAN • Server • Can create, modify & delete VLAN • Transparent • Can create, modify, & delete LOCAL VLAN • Forwards VTP advertisements.

  25. Summary • VTP pruning • Limits unnecessary dissemination of VLAN information. • Verify VTP configuration • Show VTP status • Show interfaces trunk

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