VLAN Creation
VLANs or Virtual LANs allow you to segment the physical network into separate logical networks. In this example, we’ll create the following VLANs for their associated networks.
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The Associated Network Subnet field is only for reference. As were configuring VLANs which is a layer 2 (Data Link) protocol, subnet information isn’t required.
| VLAN ID | NAME | Associated Network Subnet |
|---|---|---|
| 100 | Office | 172.128.0.1/24 |
| 102 | Voice | 172.128.2.1/24 |
| 103 | Wireless | 172.128.3.1/24 |
| 105 | Guest | 172.128.5.1/24 |
Use the following commands to add a VLAN. Repeat for each VLAN you’d like configured on the switch.
Switch (config)# vlan 100
Switch (config)# name Office
To view all configured VLANs, use the show vlan commands. Alternatively, you can see your vlan configuration in the running-config (show running-config).
Switch# show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/1, Gi1/0/2, Gi1/0/3
Gi1/0/4, Gi1/0/5, Gi1/0/6
Gi1/0/7, Gi1/0/8, Gi1/0/9
...
100 Office active
102 Voice active
103 Wireless active
105 Guest active
If you make a mistake and would like to remove a VLAN, run no in front of the command. For example, this command will remove VLAN 100 from being configured on the switch.
Switch (config)# no vlan 100