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在计算机通信中，路由器的故障会导致网络的瘫痪，为了保证数据传输的可靠性就必须设置备份的路由器，为此介绍了几种路由器备份的方式。
In computer communication, the failure of the router will lead to the network paralysis. In order to ensure the reliability of the data transmission, a backup router must be set up. Several kinds of router backup methods are introduced.