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VLANs. LAN Switching and Wireless – Chapter 3. 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.

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vlans

VLANs

LAN Switching and Wireless– Chapter 3

objectives
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.
  • Troubleshootthe 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
explain the role of vlans in a converged network1
Explain the Role of VLANs in a Converged Network
  • Describe the different types VLANs
explain the role of vlans in a converged network2
Explain the Role of VLANs in a Converged Network
  • Describe the VLAN port membership modes
explain the role of vlans in a converged network3
Explain the Role of VLANs in a Converged Network
  • Describe how to manage broadcast domains with VLANs
explain the role of vlans in a converged network4
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.
  • 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.
explain the role of vlans in a converged network5
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.
explain the role of trunking vlans in a converged network
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 network2
Explain the Role of Trunking VLANs in a Converged Network
  • Describe the switch port trunking modes
switchport mode dynamic auto
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
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 topology1
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 topology2
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 topology3
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
Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs
  • Describe the common problems with VLANs and trunks
troubleshoot common software or hardware misconfigurations associated with vlans1
Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs
  • Describe the common problems with VLANs and trunks
troubleshoot common software or hardware misconfigurations associated with vlans2
Troubleshoot Common Software or Hardware Misconfigurations Associated with VLANs
  • Describe how to use the troubleshooting procedure to fix a common problem with VLAN configurations
summary
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

summary1
Summary
  • Types of Traffic on a VLAN include
    • Data
    • Voice
    • Network protocol
    • Network management
  • Communication between different VLANs requires the use of
    • Routers
summary2
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

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