摘要:二十一世纪是信息化、网络化时代，校园网已成为各学校必备的重要信息基础设施，其规模和应用水平已成为衡量学校教学与科研综合实力的一个重要标志，最近本人参与的为宜兴市丁蜀外国语中学规划建设的校园网，就是一个技术水平较高的校园网络。
该校园网连接了教学楼、综合楼、图书馆和校内许多部门，并与接入了互联网。为了实现一个可管理的、可靠的、高性能网络，在网络规划设计时采用了下列技术措施：
层次化的结构设计方法，将网络分为核心层和接入层。两个层次的网络设备协同工作，从而有效保证了网络的高可靠性、高安全性。
在核心交换机之间部署Glbp，实现网关冗余，提高网络的稳定性。
在核心交换机与边界路由器之间部署动态路由选择协议OSPF，实现路由的动态通告和学习。
在网络边缘部署NAT，提供地址转换，以有效利用有限的公网IP地址。
在接入层使用VLAN技术给用户提供灵活的网络接入服务，各VLAN相互隔离，减少网络流量，提供安全性。同时为每一个VLAN配置一个生成树，避免环路，提高稳定性。
核心交换机之间通过使用链路捆绑技术，将多条物理链路捆绑在一起，实现高带宽，高可用性。
为避免病毒和蠕虫的泛滥，采用NetFlow技术，同时使用Qos来优化网络。
本文从校园网需要分析入手，论述了网络设计原则、网络方案设计，重点叙述了网络设备选型及网络配置方法。
关键词 校园网；网络规划；网络设计；NetFlow
Abstract:The twenty-first century is the age of the informatization and networking, campus network has become the necessary important information infrastructure of school, its size and application level has become the measure of school teaching and scientific research an important symbol of comprehensive strength, recently I participate in for the city of sichuan foreign language middle school of planning and construction of campus network, is a technology with higher levels of campus network
Hierarchical structure design method, the network is divided into core layer and access layer. Two levels of network devices to work together, thus effectively guarantees the network of high reliability, high security.
Between the core switch deployment Glbp, realizes the gateway redundancy, improve the stability of the network.
Along the boundary of the core switches and routers between the deployment of dynamic routing protocol OSPF, routing dynamic notice and study.
On the edge of the network deployment of NAT, provide address translation, in order to effective use of limited public IP address.
In the access layer using VLAN technology to provide users with flexible network access services, each VLAN mutual isolation, reduce the network traffic, to provide security. At the same time for each VLAN configuration a spanning tree, avoid the loop, improve stability.
Binding technology, through the use of the link between core switches to bundle multiple physical links together, achieve high bandwidth, high availability.
To avoid the spread of viruses and worms, USES the NetFlow technology, at the same time use Qos to optimize network.
From campus network needs analysis, this paper discusses the principle of network design, network design, focus on the network equipment selection and network configuration are described.
Key words campus network Network planning Network design NetFlow
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