To bring the physical interface from Administrativly down state to up, first go to the physical interface and issue "no shutdown" command as shown below. To create a subinterface and configure it with an IP address, use the following commands. If you take the help from Cisco IOS using question mark, we can see the number range which be can used to create subinterfaces. We use Subinterfaces for inter VLAN traffic routing by using a Router-on-a-Stick configuration, NBMA (Non Broadcast Multiple Access) WAN solutions like frame-relay or ATM etc.Ī Subinterface can be configured just like a physical interface. If we have one Router with one physical interface, but needed to have the router connected to two IP networks to route traffic between two routers, we can create two sub interfaces within the physical interface, assign each sub interface an IP address within each subnet and then route the data between two subnets. Subinterfaces are used for a variety of purposes. A sub-interface in a Cisco Router uses the parent physical interface for sending and receiving data. A subinterface is a virtual interface created by dividing one physical interface into multiple logical interfaces.
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