| Space information network through the information carrier(space platform)to real-time access,transmission and processing of spatial information,space platform is a large area,including satellites,airships and aircraft,and so on.However,the traditional satellite network has the problems of slow configuration,inefficient service scheduling and infrequent service delivery.These are the shackles of the development of the current spatial information network,and the root of these problems lies in the design of traditional satellite communication system.The development of the emerging network technology SDN(Software Defined Network)provides a new way to solve the research scholars at home and abroad:the software defines the spatial information network.In this paper,the software definition space information network and its key technology were studied,including the following aspects:First of all,because at home and abroad for the software to define the spatial information network research is only carried out the overall framework of the study,the realization of software to define the spatial information network of key technology research is scarce.In order to carry out the test of the related technology research of the software definition space information network,this paper analyzes the spatial information network architecture of the existing software,and the characteristics of the satellite network(topology dynamics,link characteristics,etc.),SDN and virtualization technology As the main technical support,set up a semi-physical simulation platform for SDN-defined software spatial information network,deploying OpenFlow network equipment,and realize the function of satellite network topology creation,link parameter dynamic configuration,trajectory simulation and so on.The software defines the spatial information network experiment platform,which can provide the analysis tool and the testing method for carrying out the software definition space information network research.Second,due to the impact of the feeder link will lead to interruption,so the need to deploy a gateway switch application on the controller to solve the link caused by the resumption of business routing problems.In this paper,the gateway switching application is developed on the RYU controller,and the gateway switching application is divided into two modules:link interrupt detection and gateway switching mechanism.The link interrupt detection is based on the link topology discovery protocol module.In the real-time detection topology,the necessary information is stored and processed.The gateway switching mechanism is developed on the basis of the recovery mechanism.When a feeder link interrupt event occurs,the OpenFlow device notifies the controller that the controller deletes the flow table affected by the fault and recalculates the working path,updates or decrements new flow chart rules.Through the combination of two modules to achieve a rapid detection of link disruption,and quickly switch business to the appropriate satellite gateway,to solve the interruption caused by interruption of business problems,to protect network services.Finally,we use the software definition space information network semi-physical simulation platform to test the development of gateway switching applications,and in the same space communication environment,the feeder link is interrupted,access to re-routing to the available satellite gateway time needed.The test results demonstrate the effectiveness of gateway switching applications based on RYU development.In the same spatial information network scenario,the software definition space information network is compared with the traditional spatial information network.Based on the gateway switching application developed on the RYU,the traditional route is compared.When the link is interrupted,the service recovery rate is obvious and the network is more reliable. |
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