© 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  Describe the different types VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 5 Explain the Role of VLANs in a Converged Network  Describe the VLAN port membership modes

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 6 Explain the Role of VLANs in a Converged Network  Describe how to manage broadcast domains with VLANs

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 7 Explain the Role of VLANs in a Converged Network  A switch virtual interface (SVI) is a VLAN of switch ports represented by one interface to a routing or bridging system.VLAN  There is one-to-one mapping between a VLAN and SVI, thus only a single SVI can be mapped to a VLAN.  In default setting, an SVI is created for the default VLAN (VLAN1) to permit remote switch administration. VLAN  An SVI cannot be activated unless associated with a physical port.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 8 Explain the Role of VLANs in a Converged Network SVIs are generally configured for a VLAN for the following reasons: Allow traffic to be routed between VLANs by providing a default gateway for the VLAN. Provide fallback bridging (if required for non-routable protocols). Provide Layer 3 IP connectivity to the switch. Support bridging configurations and routing protocol.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 9 Explain the Role of Trunking VLANs in a Converged Network  Explain the role of a trunk when using multiple VLANs in a converged network

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 10 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 11 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 12 Switchport mode dynamic auto  This command makes the interface willing to convert the link to a trunk link if the neighboring interface is set to trunk or desirable mode. Otherwise, the link will become a non-trunking link.

© 2006 Cisco Systems, Inc. All rights reserved.Cisco PublicITE 1 Chapter 6 13 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 14 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 15 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 16 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 17 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 18  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 19  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 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 PublicITE 1 Chapter 6 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 PublicITE 1 Chapter 6 22 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 23 Module 3 VLANS END