随着网络规模的扩大,用户的增加,各种基于IP协议的应用(如视频会议,远程教育)讯速发展,传统路由在校园网的安全管理和流量控制方面益发成为一个瓶颈问题,而传统交换机虽然具有快速处理数据能力。但它本质是一种多端口网桥,会产生广播,而且无法实现路由,为解决这个矛盾,网络厂商提出了第三层交换的思想。 With the expansion of network scale, the increase of users, the rapid development of various IP-based applications (such as video conferencing and distance education), the traditional routing has become a bottleneck problem in campus network security management and traffic control, while the traditional Although the switch has the ability to quickly process data. But it is essentially a multi-port bridge, will produce broadcast, and can not be achieved routing, in order to solve this contradiction, network manufacturers put forward the idea of ​​the third layer of exchange.