VLANs

© 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.


Explain the Role of VLANs in a Converged Network

Explain the role of VLANs in a converged network


Explain the Role of VLANs in a Converged Network Describe the different types VLANs


Explain the Role of VLANs in a Converged Network Describe the VLAN port membership modes


Explain the Role of VLANs in a Converged Network Describe how to manage broadcast domains with

VLANs



A switch virtual interface (SVI) is a VLAN of switch ports represented by one interface to a routing or bridging system.

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.

An SVI cannot be activated unless associated with a physical port.



•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.


Explain the Role of Trunking VLANs in a Converged Network Explain the role of a trunk when using multiple VLANs

in a converged network


Explain the Role of Trunking VLANs in a Converged Network Describe how a trunk works


Explain the Role of Trunking VLANs in a Converged Network Describe the switch port trunking modes


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.


Configure VLANs on the Switches in a Converged Network Topology Describe the steps to configure trunks and VLANs


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


Configure VLANs on the Switches in a Converged Network Topology Describe the Cisco IOS commands used to manage

VLANs on a Cisco Catalyst switch


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


Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs Describe the common problems with VLANs and trunks


Describe the common problems with VLANs and trunks

Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs


Describe how to use the troubleshooting procedure to fix a common problem with VLAN configurations

Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs


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


Summary

Types of Traffic on a VLAN includeData

Voice

Network protocol

Network management

Communication between different VLANs requires the use of

Routers


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


Module 3 VLANS

END

VLANs

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