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A survey of control consistency in Software-Defined Networking

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CCF Transactions on Networking

Abstract

Software-Defined Networking (SDN) offers a flexible and programmable model to manage and schedule network resources. With the separation of control plane and data plane in SDN, the centralized controller frequently updates the flow tables in data plane to control network, and the data plane also communicates its requests with the control plane for forwarding actions. Due to the asynchronous control nature of SDN, a SDN network may suffer from inconsistency issues caused by concurrency violations, which may lead to network misbehaviors, such as communication interruption, policy violation, and performance degradation. To make SDN correct and stable, consistency is an essential feature that SDN should possess. In this paper, we make a survey about the control consistency in SDN from three aspects: (1) a consistent network view and control decisions made by the control plane, (2) consistency and efficiency during data plane update, (3) maintaining consistent flow tables in the data plane. We summarize the fundamental causes of consistency issues, the potential inconsistency problems and the state-of-art solutions, and then discuss the challenges to guarantee the consistency for SDN.

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Acknowledgements

This work is partially supported by the National Key R&D Program of China (Grant no. 2017YFB0802300) and the National Natural Science Foundation of China (Grant nos. 61602503, 61601483).

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  1. National Laboratory for Parallel and Distributed Processing, National University of Defense Technology, Changsha, China

    Jinshu Su

  2. Academy of Military Science, Beijing, China

    Wen Wang

  3. Logistic Support Department of CMC, Beijing, China

    Cong Liu

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  1. Jinshu Su
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Correspondence to Wen Wang.

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Su, J., Wang, W. & Liu, C. A survey of control consistency in Software-Defined Networking. CCF Trans. Netw. 2, 137–152 (2019). https://doi.org/10.1007/s42045-019-00022-w

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