© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE I Chapter 6 1 VLANs LAN Switching and Wireless – Chapter 3

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 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.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 3 Explain the Role of VLANs in a Converged Network  Explain the role of VLANs in a converged network

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 4 Explain the Role of VLANs in a Converged Network

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 5 The benefit of VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 6 Explain the Role of VLANs in a Converged Network

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 7 Explain the Role of VLANs in a Converged Network  Describe the different types VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 8 Explain the Role of VLANs in a Converged Network  Describe the VLAN port membership modes Dynamic Vlan - it’s not popular but it is done by using VLAN Membership Policy Server (VMPS)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 9 Explain the Role of VLANs in a Converged Network  Describe how to manage broadcast domains with VLANs switch virtual interface (SVI) is a logical interface configured for a specific VLAN. You need to configure an SVI for a VLAN if you want to route between VLANs or to provide IP host connectivity to the switch. By default, an SVI is created for the default VLAN (VLAN 1) to permit remote switch administration.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 10 Explain the Role of Trunking VLANs in a Converged Network  Without VLAN trunking

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 11 Explain the Role of Trunking VLANs in a Converged Network  A trunk is a point-to-point link between two network devices that carries more than one VLAN.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 12 Explain the Role of Trunking VLANs in a Converged Network  Remember that switches are Layer 2 devices. They only use the Ethernet frame header information to forward packets. The frame header does not contain information about which VLAN the frame should belong to.  When Ethernet frames are placed on a trunk they need additional information about the VLANs they belong to.  This is accomplished by using the 802.1Q encapsulation header. This header adds a tag to the original Ethernet frame specifying the VLAN to which the frame belongs.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 13 Explain the Role of Trunking VLANs in a Converged Network

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 14 Explain the Role of Trunking VLANs in a Converged Network  Describe how a trunk works

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 15 Dynamic Trunk Protocol switchport mode

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 16 Explain the Role of Trunking VLANs in a Converged Network  Describe the switch port trunking modes

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 17 Configure VLANs on the Switches in a Converged Network Topology  Describe the steps to configure trunks and VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 18 Configure VLANs on the Switches in a Converged Network Topology  Describe the Cisco IOS commands used to create a VLAN on a Cisco Catalyst switch

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 19 Configure VLANs on the Switches in a Converged Network Topology  Describe the Cisco IOS commands used to manage VLANs on a Cisco Catalyst switch

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 20 Configure VLANs on the Switches in a Converged Network Topology

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 21 Configure VLANs on the Switches in a Converged Network Topology  Describe the Cisco IOS commands used to create a trunk on a Cisco Catalyst switch

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 22 Configure VLANs on the Switches in a Converged Network Topology  Remove Vlans

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 23 Configure VLANs on the Switches in a Converged Network Topology Delete VLANs Using command no vlan vlan-id to remove a VLAN from the system Alternatively, the entire vlan.dat file can be deleted using the command delete flash:vlan.dat from privileged EXEC mode. After the switch is reloaded, the previously configured VLANs will no longer be present. This effectively places the switch into is "factory default" concerning VLAN configurations.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 24 Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs  Describe the common problems with VLANs and trunks

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 25  Describe the common problems with VLANs and trunks Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 26  Describe how to use the troubleshooting procedure to fix a common problem with VLAN configurations Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 27 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 PublicITE 1 Chapter 6 28 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 PublicITE 1 Chapter 6 29 Summary  Trunks A common conduit used by multiple VLANS for intra-VLAN communication  EEE 802.1Q 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 PublicITE 1 Chapter 6 30