How to Configure a VLAN on a Cisco Switch
To configure a VLAN on a Cisco switch: create the VLAN, name it, then assign access ports to it — three short steps. Here's the exact process with commands and verification.
VLANs logically separate a switch into isolated networks. This guide covers creating one and putting device ports into it. Practise it live in the VLAN lab.
Step 1: Enter global configuration mode
enableconfigure terminal | Access privileged EXEC, then global config |
Step 2: Create and name the VLAN
vlan 10name SALESexit | Creates VLAN 10 with a descriptive name |
Step 3: Assign access ports to the VLAN
interface range fa0/1 - 4switchport mode accessswitchport access vlan 10 | Puts ports 1-4 into VLAN 10 as access ports |
Verification
Run show vlan brief — VLAN 10 (SALES) should list ports Fa0/1–4. Devices in VLAN 10 can now ping each other but are isolated from other VLANs until inter-VLAN routing is configured.
Frequently asked questions
How do I create a VLAN on a Cisco switch?
In global config: vlan 10, then name SALES. That creates and names VLAN 10; you then assign ports to it.
What is the command to assign a port to a VLAN?
In interface config: switchport mode access followed by switchport access vlan 10 assigns that port to VLAN 10.
How do I verify my VLAN configuration?
Run show vlan brief — it lists each VLAN with its name, status and assigned access ports.
Why can't my VLAN devices reach other VLANs?
VLANs are isolated by design — you need a router or Layer 3 switch performing inter-VLAN routing to connect them.
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