Sub-Interface Configuration

In This section we are going to split  router's single interface to work like two separate interface in order to connect different network segment with single switch.

for this scenario, 

• we are taking two network segment which is 10.0.0.0 and 11.0.1.0 
• connecting them with with single port of router's i.e fa 0/0 (splitted into fa 0/0.2 and fa 0/0.3)
• cable's which is connected with router's interface , the otherside connected with switch would be configured as trunk link.
• both the vlans vlan-2 and vlan-3 will be configured as would be configured with respective network  ip address i.e 10.0.0.1 and 11.0.1.1

Router-Rcy(config)#in fa 0/0

Router-Rcy(config-if)#no sh

Router-Rcy(config)#in fa 0/0.1

Router-Rcy(sconfig-subif)#encap dot1Q 2 ………………………………………2 is the vlan no.

Router-Rcy(config-subif)#ip add 10.0.0.1 255.0.0.0.......Network address matched to vlan 2

Router-Rcy(config-subif)#no sh

Router-Rcy(config-subif)#in fa 0/0.2 dot1Q 3………………………………………3 is the vlan no.

Router-Rcy(config-subif)#ip add 11.0.1.1 255.0.0.0.............Network address matched to vlan 3