针对目前传统机动通信系统、主流软件定义网络(software defined network，SDN)的拓扑发现方法不适合基于分布式SDN的机动通信系统这一问题，遵循OpenFlow拓扑发现算法(OpenFlow discovery protocol，OFDP)移植传输控制协议/网际协议(transmission control protocol/Internet protocol，TCP/IP)相关协议到 SDN网络的研究思路，对开放最短路径优先(open shortest path first，OSPF)协议进行优化，精简协议状态机、优化协议报文、增加协议功能并设计拓扑发现算法，提出一种适合基于分布式SDN的机动通信系统的拓扑发现方法，并搭建仿真实验平台进行验证。实验结果表明，优化后OSPF协议适应于分布式SDN网络，网络拓扑建链时间降低80％且重新收敛时间显著降低，建链开销平均每秒接收字节数、发送字节数分别下降了31。7％和21。5％，维持开销平均每秒收发字节数降低了45％，增加了收集信道种类等网络信息的新功能。
Topology discovery method for mobile communication systems based on distributed SDN
Aiming at the problem that topology discovery methods of traditional mobile communication systems and mainstream software defined network(SDN)are not suitable for mobile communication systems based on distributed SDN,following the research idea of porting transmission control protocol/Internet protocol(TCP/IP)family to SDN based on OpenFlow discovery protocol(OFDP),the open shortest path first(OSPF)protocol is optimized to simplify state machines,optimize packets,increase functions,and design the topology discovery algorithm.A topology discovery method suitable for mobile communication systems based on distributed SDN is proposed,and a simulation experiment platform is built for verification.The results show that the optimized OSPF is suitable for distributed SDN network,the network topology establishment time is reduced by 80％and the recovery time is significantly reduced.The average number of received bytes per second and sent bytes per second of the establishment cost are decreased by 31.7％and 21.5％and the average number of sent and received bytes per second of the maintenance cost is reduced by 45％.New functions for network statuses are added such as collecting channel types.
topology discoveryopen shortest path first(OSPF)protocoldistributed software defined network(SDN)mobile communication system
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