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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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.
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.
Type "Private-VLAN mapping." This will map the secondary VLANs to the layer 3 VLAN.
Type "end" to return to privileged mode, and type "copy run start" to save the configuration.
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