基于SDN的校园网动态服务链设计与实现

摘要

大学校园网中灵活多样的服务受限于校园网网络固定及硬性服务配置组合，不能快速满足用户对服务的灵活配置及网络架构的进化需求。给出基于 SDN（Software-Defined Networking）的校园网动态服务链为核心的网络服务架构，利用 SDN 的控制与转发相分离的机制实现对网络设备的逻辑集中化控制，利用 SDN 的可编程能力实现网络的灵活配置，并借助于 SDN 网络对数据包的修改能力，最终以动态服务链的形式对外提供校园网服务。实现了服务的动态添加、删除、动态透明迁移以及软服务和硬服务的混合编排，最后通过原型实验，验证了该方法的可行性。%Flexible and diverse services in campus networks of university are limited by the configuration combination of network fixation and rigid services of the campus networks,which can’t rapidly meet the requirements of users in flexible configuration of the services and the evolution of network architecture.The paper presents a network service architecture,which is based on software defined network (SDN)and uses dynamic service chain of campus network as the core.It uses SDN’s mechanism of separating the control and forwarding to implement logic centralised control on network devices,uses SDN’s programmable ability to realise flexible configuration of networks,and with the help of the modification ability of SDN on data packet,it eventually provides external campus services in the form of dynamic service chain.This architecture achieves dynamic services adding and deleting,dynamic and transparent migration,as well as the mixed arrangement of soft service and hard service.Finally we verified the feasibility of the proposed method through prototype experiment.