软件定义网络架构下的动态自适应负载均衡策略研究

软件定义网络控制与转发分离的架构特性使得网络行为更加易于掌控,提高了网络策略实施的效率.为了解决传统网络中只计算单一最短路径,忽略链路实时状态从而造成负载过大时链路拥塞的缺点,提出了一个基于链路实时状态的负载均衡策略.该策略主要思想是利用软件定义网络架构中的控制器对全网的集中控制能力对链路信息进行实时监控,分析链路信息并得出链路的负载占用情况,然后将结果反馈给控制器,最后由控制器计算出负载最轻的路径并下发流表给相应的交换机.建立了计算机仿真建模和硬件实验平台,验证了该策略可以有效提高链路利用率和用户服务质量.

Dynamically adaptive load balancing strategy under the software defined network structure

The architecture features of software-defined network control and forwarding separation make the network , s behavior easier to control, and improve the efficiency of the implementation of network strategy. In order to solve the shortcomings that compute a single shortest path only and ignore the real-time status of the link resulting the link congestion when load is too large in traditional network, this paper proposes a load balancing strategy based on the link''s real-time state. The main idea of this strategy is to use the controller for centralized control of the entire network to monitor the link''s information, analyze the link''s information and obtain load occupancy of the link ; the results are then fed back to the controller ,and finally the controller calculates the lightest path of the load and sends the flow tables to the corresponding switches. A computer simulation modeling and a hardware experimental platform were established, and the strategy was validated that it can effectively improve the link''s utilization and user''s quality of service.