How Do I Create a VLAN Map on a Cisco 3750?

Written by george garza
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How Do I Create a VLAN Map on a Cisco 3750?
A switch can map VLANs for interaction with different subnets by mapping them. (ADSL Router image by Phil2048 from

Private Virtual Local Area Networks (VLAN) operate on switches. They break a domain into multiple subdomains, usually by port. A 3750 switch can have 24 or 48 ports, which connect to PCs. Each VLAN can have one or more ports assigned. Switches are layer 2 devices, but they can act like layer 3 devices, or routers, with the proper set-up. Secondary VLANs have different subnets and need a layer 3 device to connect to other VLANs. However, you can map the VLANs to a layer 3 device using a switch virtual interface (SVI).

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  1. 1

    Connect to the switch with a console cable and the connection software. When the switch configuration window appears on the computer screen, type "enable." Type "configure terminal" to enter global configuration mode.

  2. 2

    Type "Interface VLAN" to enter the VLAN interface mode. In this mode, you will configure a primary VLAN and a secondary VLAN to the SVI.

  3. 3

    Type "Private-VLAN mapping." This will map the secondary VLANs to the layer 3 VLAN.

  4. 4

    Type "end" to return to privileged mode, and type "copy run start" to save the configuration.

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