因为IPV4 地址紧缺和多运营商互通受限问题，大多数高校采用多出口的网络来满足其需求。结合实际情况， 运用基于源地址的策略路由来解决多出口的路由选择问题，不仅很好地利用了多条链路，提高了网络访问速度，还大大增加了 网络可靠性和安全性。

Because of the shortage of IPV4 addresses and the limitation of data transmission between multiple operators, most colleges use more than one ISP to meet their needs. Using PBR based on source address to solve the problem of multiple outlet routes, not only makes good use of the more than one network links, improving network access speed, but also greatly increases network reliability and security.