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路由器断电等原因脱离网络之后,其子节点的去向?

现有拓扑:

      协调器-------路由器A--------路由器B

                                          --------终端节点A

其中:路由器B、终端节点A是路由器A的子节点

现在问题是路由器A断电等原因脱离网络之后,我们知道终端节点会重新选择父节点加入网络(data request原因),但是路由器B是不会重新选择父节点,那么此时协调器能和路由器B通信么?如何才能让路由器B重新加入网络中呢?