VLANs VTP LAN Switching and Wireless Chapter 3

VLANs & VTP LAN Switching and Wireless – Chapter 3, 4 Version 4. 0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1

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. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2

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. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3

VLANs in a Converged Network © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4

Controlling Broadcast Domains with VLANs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5

Trunking VLANs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6

Trunking Operation © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7

VLAN Troubleshooting © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8

Native VLAN Mismatches © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9

Wrong IP Subnet © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10

VLANs Not Allowed on Trunk © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11

VTP – VLAN Trunking Protocol © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12

VTP Domains © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13

VTP Advertisements © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14

VTP Modes © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15

VTP Pruning § Prevents unnecessary broadcast traffic E. g. , broadcast packets from PC 1 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16

Troubleshoot VTP problems § Incompatible VTP versions VTP v 1 and v 2 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 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17

Incorrect VTP domain name © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18

All Switches Are VTP Clients VTP Client All VLAN information will be gone after rebooting! © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19

Incorrect Revision Numbers © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20

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 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21

Summary § Types of Traffic on a VLAN include Data Voice Network protocol Network management § Communication between different VLANs requires the use of Routers © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22

Summary § Trunks A common conduit used by multiple VLANS for intra-VLAN communication § IEEE 802. 1 Q The standard trunking protocol Uses frame tagging to identify the VLAN to which a frame belongs Does not tag native VLAN traffic © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23

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. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24

Summary § VTP pruning Limits unnecessary dissemination of VLAN information. § Verify VTP configuration Show VTP status Show interfaces trunk © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25

© 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26