Route switching method and system

The invention provides a route switching method, which provides a basic format of a first data frame, and provides a target IP address of a preset position from the first data frame. And in the process of traversing the internal local area network segment table, judging whether the target IP address belongs to the internal local area network segment table, and if so, forwarding the first data frame to an intermediary switch, so that the intermediary switch forwards the first data frame to a target switch corresponding to the target IP address. And if not, sending the first data frame to a router. Based on the scheme, the intermediary switch is arranged among the plurality of associated local area networks, so that the associated local area networks can be accessed without a router, the burden of the router is reduced, and the access speed among the intranets is improved. 本申请提供有一种路由交换方法，该方法中提供有第一数据帧的基本格式，并从第一数据帧中提供预设位置的目标IP地址。在遍历内部局域网段表的过程中，判断该目标IP地址是否属于内部局域网段表，若属于，再将该第一数据帧转发至中介交换机，以便所述中介交换机将第一数据帧转发至与所述目标IP地址对