如图所示,当Switch C和Switch D之间的链路发生故障时(即检测到链路link down),启动保护切换机制,将故障链路两端的端口阻塞并刷新本设备的FDB表。然后Switch C和Switch D通过发送SF R-APS报文将故障信息发送给ERPS环中的其他节点。当Switch A和Switch B收到SF R-APS报文后,分别打开RPL owner端口和RPL neighbour端口并刷新FDB表,保证通信畅通。
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