Configuration of Vlan Commands| In this article we
learn about configuration of vlan, how assign port to particular vlan.
Concept of native vlan
Native vlan is useful to send untagged frame
.Tagged frame sends the traffic for the particular vlan but untagged frame can any traffic which is not gone through to any particular vlan.
Concept of Dynamic trunk protocol
Dynamic Trunk Protocol is a cisco proprietary
protocol which automatically negotiates the switch mode. Three types of
mode is available in cisco switch port.
·
Access port:
·
Trunk port: Trunk port is the port which conveys labeled and untagged traffic both between the switch.
·
Dynamic
Configuration of vlan
Lets take a example
Suppose in an organization there is two departments
one is hr and other is sales.
So we configure two vlans for two departments
by which any department can not communicate the other department.
To configure the vlan we need to enter the global
configuration mode and execute the following command.
Switch(config)#vlan <vlan
no>
After running the above command we got the
following promt in which we can define the name of the vlan as per our example.
We configure vlan10 for hr department and
vlan20 for sales department.
 |
| Configuration of vlan |
Switch(config)#vlan 10
Switch(config-vlan)#name hr
Switch(config-vlan)#exit
Switch(config)#vlan 20
Switch(config-vlan)#name sales
Switch(config-vlan)#exit
Assign port to vlan
After configuration of vlan we need to assign port on the switch
to the configured vlan.
Here pc0 is connected to fa0/1.As access port is configure for the
end gadget.
To assign the port to the vlan we go to interface configuration
and execute the following command.
Switch(config)#int fa0/1
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 10
Switch(config-if)#exit
Switch(config)#int fa0/2
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 20
Switch(config-if)#exit
Configure Trunk port
Trunk port is the port which conveys labeled and untagged traffic both between the switch.To configure trunk port we need to move interface config mode and execute the below command.
Here fa0/3 is the trunk port because it
creates the trunk link between two switches.
Switch(config)#int fa0/3
Switch(config-if)#switchport mode trunk
Switch(config-if)#exit
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