This document outlines the construction of an SDN testbed using Raspberry Pi and the ONOS/OVX SDN controller, detailing the architecture, installation procedures, and key functionalities of the system. It covers elements such as the deployment of the Open vSwitch and the configuration of network elements, along with guidelines for setting up the necessary software and environments. Additionally, it highlights the goals and achievements of the ONOS initiative for providing a carrier-grade SDN operating system for service providers.