VLAN
A virtual LAN (Local Area Network) is a logical subnetwork that can group together a collection of devices from different physical LAN.
1-1 Create VLAN
Imagine that we have different departments on your company and you want to separate each department based on their employees. So, with the VLAN concept you can create a VLAN and then assign different ports to these VLANs.
In the above picture, we have 3 departments, each of which is assigned to unique VLAN. let's configure switch:
For viewing created VLANs, we enter this command:
VLAN 1 is a default VLAN in Cisco devices. VLAN from 1002-1005 are for other protocols. VLAN from 1006- 4094 is called Extended VLAN.
1-2 Access Switch Ports to Vlan
In above picture, a PC in VLAN 10 is connected to port Fa0/1 switch. So, we can write this command to access port Fa0/1 to VLAN 10:
Now, if we enter show vlan:
Now we do it for other ports:
and the result is:
1-3 Native Vlan
By default in Cisco switches , Vlan 1 is a native Vlan. It means, untagged traffic carries in this vlan. We'll know how to change Native Vlan.
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