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<p>这是因为Mininet在网络仿真中不支持循环。阅读关于生成树算法的<a href="http://osrg.github.io/ryu-book/en/html/spanning_tree.html" rel="nofollow noreferrer">this link</a>来克服这个问题。另请参见<a href="https://github.com/mocast/OpenFlow_Loop_Solution/blob/master/circle-topo.py" rel="nofollow noreferrer">here</a>。在</p>