基于SDN拓扑集中更新的NDN路由策略

基于软件定义网络（SDN）拓扑集中更新的命名数据网络（NDN）路由策略，将路由的2个关键功能分离，拓扑更新功能集中置于SDN控制器中，而路由计算功能分布式地置于NDN内容节点中.同时，对网络拓扑进行负载加权预处理，在考虑网络状态的前提下，可优化路由计算.仿真结果表明，在基于SDN拓扑集中更新的NDN路由策略中，内容请求数据流的首包时延平均降低了90%，SDN控制器的负荷平均降低了10%~30%，全网实现了有效的负载均衡.

NDN Routing Strategy Based on SDN Centralized Topology Update

Named data networking (NDN) routing strategy based on software defined network (SDN) centralized topology update separates the two key functions of routing. The topology update function is centralized in the SDN controller, while the route calculation function is distributed in the NDN content nodes. In addition, in this strategy, load-weighted preprocessing of the network topology can be performed under the premise of considering the state of the network. Simulation results show that in the NDN routing strategy based on the SDN centralized topology update, the delay of the first packet of the content request data stream is reduced by an average of 90%, the load of the SDN controller is reduced by an average of 10% to 30%, and the entire network realizes an effective load balancing.