Developing Inter-Cluster Interfaces for Software-Defined Networking Architecture

Software-Defined Networking is proposed and realised in order to achieve flexibility and agility in Wide-Area Networking. To incorporate high availability, fault-tolerant, accessibility and compliance with regional policies, multiple instances of the controller are deployed on different geographical sites. To maintain the consistency of the control plane, a consensus algorithm is implemented on all controller nodes. This paper makes two major contributions. First, the authors address the shortcomings of the two algorithms that are based on Raft and are used for multi-region consensus, that are Multi-Raft and BW-Raft. Next, we propose Dyna-Raft - an algorithm that allows division of a Raft cluster into temporary regions in case of network partitioning, as well as leader logs reconciliation when the said problem is fixed. Finally, we evaluate and address the capabilities and trade-offs of our works, which makes ways for future improvements.