三层交换及虚拟网技术的应用研究

第三层交换技术是将网络层的功能融入交换机，将第二层交换机与第三层路由器两者的优势集成在一起，在各个层次提高网络速度性能的一种网络技术．用三层交换机可取代传统路由器充当局域网路由器，采用三层交换技术还可有效地提高网络的性能和安全性，并使网络管理员对网络管理更加灵活方便．因此，三层交换和VLAN技术已经成为中小型校园网建设的有效解决方案。

Research on Three Layers Switching and VLAN

The 3th layer switching technology fuse the function of network layer into switch machine. By integrating the advantage of 2nd layer switch machine and the third layerr outer the speed of the network performancec an be improved. How to use 3th layer switchmachines in campus network is also discussed in detail. 3th layer switchmachine can replace the traditional router for LAN routing. Using layer3 switch machine can prevent IP embezzlement effectively and improve the network security and the administrator can man-age the network more conveniently and easily . 3th layer switching technology is put forward inaccordance with the medium and small scale campus network.