VLAN and VLAN Trunking Configuration and
Verification
Cisco switches do not require any configuration to work. You can purchase Cisco switches,
install devices with the correct cabling, turn on the switches, and they work. You would
never need to configure the switch, and it would work fine, even if you interconnected
switches, until you needed more than one VLAN. But if you want to use VLANs—and most
enterprise networks do—you need to add some configuration.
This chapter separates the VLAN configuration details into two major sections. The first sec-
tion looks at how to configure static access interfaces: switch interfaces configured to be in
one VLAN only, therefore not using VLAN trunking. The second part shows how to config-
ure interfaces that do use VLAN trunking.
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