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Therefore, a new\u2010generation architecture, software\u2010defined networking (SDN), came into being. The new\u2010generation SDN can control routing through software, making flexible and convenient management a key feature of SDN. However, attacks and threats are prevalent in today\u2019s networking environment. When an SDN controller encounters a hacker attack or virus infection, it will not function properly. Hence, we need to design a fault\u2010tolerant mechanism for the above environment. 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