SDN-based load balancing for multi-path TCP

In this paper, a novel load-balancing technique for local or metro-area traffic is proposed in mesh-style topologies. The technique uses Software-Defined Networking (SDN) architecture with virtual local area network (VLAN) setups typically seen in a small-to-medium enterprise networks. This was done to provide a possible solution for the load-balancing dilemma of congestion and under-utilization of network links. The transport layer protocol Multi-Path TCP (MPTCP) coupled with IP aliasing is used, which enables formation of multiple subflows depending on the availability of IP addresses at either ends and helps to divert traffic in the subflows across all available paths. The traffic formed of each subflow would be forwarded across the network based on Hamiltonian `paths' that are created in association with each ingress/egress switch directly connected to hosts. Our study shows the advantages of using MPTCP for load balancing purposes in SDN architectures and provides a platform for using VLANs, SDN, and MPTCP for traffic management.