© 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 Benefit of VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 5 VLAN ID Range  Normal Range reserved for Token Ring and FDDI VLANs 1 and are automatically created and cannot be removed Stored in vlan.dat file in flash memory VTP can only learn normal range VLANs  Extended Range Designed for service providers Have fewer options than normal range VLANs Stored in running-config file VTP does not learn extended range VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 6 Types of VLAN  Data VLAN : Student & Guest  Default VLAN? Native VLAN? Mangement VLAN?

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 7 VLAN Port Membership Mode  Static Mode: Manual Config  Dynamic VLAN: Use VLAN Membership Policy Server (VMPS). Not widely used.  Voice VLAN: Support IP Phone.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 8 Voice VLAN

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 9 Controlling Broadcast Domain (3.1.4)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 10 Layer 3 Forwarding

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 11 VLAN Trunks 1 switch port 4 VLANs: 10,20,30,99 1 switch port 4 VLANs: 10,20,30,99 Trunking

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter Q Frame Tagging  When Ethernet frames are placed on a trunk they need additional information about the VLANs they belong to.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 13 Tagged vs. UnTagged frames on Native VLAN  Control traffic sent on native VLAN should be untagged.  Tagged Frames on Native VLAN are dropped.  All untagged frames coming in/out of 802.1Q port are forwarded to native VLAN.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 14 Trunking Modes

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 15 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 16 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 17 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 18 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 19 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 20  Describe the common problems with VLANs and trunks Troubleshoot VLANs Problems

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 21 Troubleshoot VLANs Problems

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 22  Describe how to use the troubleshooting procedure to fix a common problem with VLAN configurations Troubleshoot VLANs Problem

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 23 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 24 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 25 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 26