On Studying of Scalability in Single-Controller Software-Defined Networks
Soranad Chaipet, Wanida Putthividhya · 2019
Software-Defined Networks (SDN) introduce a new networking architecture that separates the control and data planes from each other. The SDN controller inside the control plane governs and monitors all network devices in the data plane using the OpenFlow protocol. The centralized manner of SDNs results in the well-known scalability problem. This paper studied the impact of network size increases to the service inside SDNs. The performance metrics used to indicate the quality of network service are end-to-end delays, throughput, and percentage of successful transmissions as network size increased. We focused on SDNs controlled by two market-leading controllers, namely OpenDaylight (ODL) and Open Network Operating System (ONOS). Our results indicated that increasing of network sizes impacted SDNs controlled and monitored by ODL and ONOS in a similar manner. However, we found that ODL and ONOS yielded different degree of scalability.