InterVLAN Routing

• VLANs divide the network in to smaller broadcast domains but also prohibit communication between domains. To enable communication, we use InterVLAN Routing.
• In InterVLAN routing, use two or more VLAN connectivity.
• InterVLAN routing also called Router on Stick Method.

Figure: InterVLAN Routing

InterVLAN Routing Configuration

Switch Configuration

Step 1: Create two VLANs in switch and name it.

1st VLAN

Switch#configure terminal
Switch(config)#vlan 20
Switch(config-vlan)# name HR
Switch(config-vlan)# exit

2nd VLAN

Switch#configure terminal
Switch(config)#vlan 30
Switch(config-vlan)#name Sales
Switch(config-vlan)#exit

Step 2: Assign Port with separate VLAN

For VLAN 20

Switch(config)#interface e0/1
Switch(config-if)#switchport access vlan 20
Switch(config-if)#exit

For VLAN 30

Switch(config)#interface e0/2
Switch(config-if)#switchport access vlan 30
Switch(config-if)#exit

Step 3: Trunk the Port

Switch(config)#interface e0/0
Switch(config-if)#switchport trunk encapsulation dot1q
Switch(config-if)#switchport mode trunk
Switch(config-if)#exit

Router Configuration

Step 1: Router port which are connected with switch trunk port.

Router#configure terminal
Router(config)#interface e0/0
Router(config-if)#no shut
Router(config-if)#Exit

Step 2: Create sub-interface for VLAN 20

Router(config)#interface e0/0.1
Router(config-subint)#encapsulation dot1q 20
Router(config-subint)#ip address 10.0.0.1 255.255.255.0
Router(config-subint)#no shut
Router(config-subint)#exit

Create sub-interface for VLAN 30


Router(config)#interface e0/0.2
Router(config-subint)#encapsulation dot1q 30
Router(config-subint)#ip address 20.0.0.1 255.255.255.0
Router(config-subint)#no shut
Router(config-subint)#exit

PC Configuration

PC 1

IP address : 10.0.0.2
Subnet : 255.255.255.0
Gateway : 10.0.0.1

PC 2

IP address : 20.0.0.2
Subnet : 255.255.255.0
Gateway : 20.0.0.2

Output: 

• Now ping and check the connectivity between PC 1 and 2. 
• Also check successful InterVLAN routing.
• Check the communication between VLAN20 and VLAN 30

PC1 to PC2

Ping 20.0.0.2

PC2 to PC 1

Ping 10.0.0.2