Efficient Topology Discovery in Software Defined Networks: Revisited

Software Defined Networks (SDN) is a novel model for networking that is currently becoming an interesting area for research and industry organizations which makes networks more manageable and customizable. In this paper, we investigated OpenFlow Discovery Protocol v.2 (OFDP v2) and compare it with standard OFDP protocol. We also intend to study OFDP v2 behavior and how it works in term of packet retransmission between SDN controller and SDN switches. We mean to show how OFDP v2 works from different perspective. Our experiments show that using OFDPv.2B protocol requires at least one retransmission per each packet which the controller sends out. However, OFDPv.2 still shows better results when it is compared with standard OFDP protocol in term of reducing the number of Packet_OUT messages.