**2.1 Data plane**

It consists of hosts and Open Flow (OF) switches. OF forwards data from source to a destination following the instructions of the Control layer. The data plane handles the data traffic forwarding and processing based on the configuration set by the control plane. It implements all the forwarding and processing decisions which have been made and commanded by the control plane. Also, the data plane needs to respond to network failure which is configured by the control plane. The controller plane interface with the data plane is called D-CPI. It executes the function which is capable of event notification.
