VLAN Configuration on Cisco Router

We have learned to configure VLAN and Router in the previous classes.

Now in this class we will learn to configure the VLAN on a Router.

Why do we need to do so?

Let us understand that VLAN separates single physical workstation into logical two or more workstations in order to restrict access of local system data of different subdivided workstations depending on the requirement arises of an organization.

But they also have the requirements to access data over the Internet; so we also need to configure the VLAN setup in the Router so that they can access the Internet through the Router ports; Router has the default VLAN; if we create new VLAN for the switches then the same VLAN must be created in the Router ports to get matches with the switch VLAN.

Using VLAN we can also subdivide single port of the Router into multiple ports and in this way we can eliminate the cost of purchasing more Routers for creating separate networks.

Now let us first create two new VLAN in the switch;

Follow these steps after accessing the switch configuration interface through the screen of a computer or laptop which is connected to it with a console cable.

Switch>enable

Switch#configure terminal

Switch(config)#vlan 2
Switch(config-vlan)#name Student
Switch(config-vlan)#exit

Switch(config)#vlan 3
Switch(config-vlan)#name Teacher
Switch(config-vlan)#exit

Switch(config)#interface fastEthernet 0/1
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 2
Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/2
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 2
Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/3
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 3
Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/4
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 3
Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/5
Switch(config-if)#switchport mode access
Switch(config-if)#switchport mode trunk
Switch(config-if)#exit

Switch(config)#exit

Switch#write

Building configuration...
[OK]

Switch#show vlan

Switch#exit

Switch>

Now let us configure the Router;

Open Router Interface through the Laptop Screen which is connected to it with a console cable.

Continue with configuration dialog? [yes/no]: no

Router>enable

Router#configure terminal

Router(config)#interface fastEthernet 0/0
Router(config-if)#no ip address
Router(config-if)#no shutdown
Router(config-if)#exit

Router(config)#interface fastEthernet 0/0.1
Router(config-subif)#encapsulation dot1Q 2
Router(config-subif)#ip address 1.0.0.1 255.0.0.0
Router(config-subif)#exit

Router(config)#interface fastEthernet 0/0.2
Router(config-subif)#encapsulation dot1Q 3
Router(config-subif)#ip address 2.0.0.1 255.0.0.0
Router(config-subif)#exit

Router(config)#exit

Router#write

Building configuration...
[OK]

Router#show ip route

C 1.0.0.0/8 is directly connected, FastEthernet0/0.1
C 2.0.0.0/8 is directly connected, FastEthernet0/0.2

Router#exit

Router>

Therefore; by applying the above steps we have created two separate VLANs those are VLAN-2 as Student and VLAN-3 as Teacher in a switch.

Fa0/1 & Fa0/2 are allotted to VLAN-2 and Fa0/3 & Fa0/4 are allotted to VLAN-3; the Fa0/5 port is converted to the trunk port which is connected to the Router through port number Fa0/0.

We also have created same VLANs that are VLAN-2 and VLAN-3 in the Router port Fa0/0 after subdividing the same into two separate logical ports these are Fa0/0.1 and Fa0/0.2.

We have also assigned the IP Addressees to those ports as 1.0.0.1 to Fa0/0.1 and 2.0.0.1 to Fa0/0.2; which will be the gateway for the computers those will be connected to the corresponding networks.

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