The Research And Application Of SDN Interface Technology

The software-defined network(SDN)is a new type of network architecture.Unlike the traditional network,SDN decouples the data plane from the control plane,concentrates the control function into the controller,and the network device is in the controller Under the guidance of data forwarding.SDN is divided into application layer,control layer and data layer.SDN appears to meet the needs of the development of network services,compared with the traditional network,SDN can better achieve service customization.The north interface can make the upper application more convenient to call the relevant module to achieve more diverse functions,the southbound interface OpenFlow is through the controller to the switch to send control information,this paper has a comprehensive study of the domestic and foreign on the software defined network,The north interface and the Ryu controller,and introduces the related core technology of the OpenFlow protocol of the south interface.On this basis,the traffic monitoring module is connected with the bandwidth protection module and the shortest path forwarding through the southbound interface OpenFlow Function,the north interface is used to obtain the relevant link on the equipment information,etc.,but also through the northbound interface to the flow table related operations.This paper summarizes the above technologies,puts forward the design scheme of service custom application,and carries on the realization of each function module according to the scheme,uses the message between the controller and the OF switch to carry on the flow perception,and according to the measurement result,Through the topology information and link situation to obtain the routing,for similar to the needs of home users bandwidth bandwidth can be guaranteed,the user can SDN northbound interface to the network resources to arrange to meet their own needs to customize the service.To this end,combined with the actual application scenarios,developed a service custom application design,and to achieve a service based on SDN custom applications.The proposed design application is placed in the actual SDN network environment and tested and verified.The results show that the application can be better to achieve service customization capabilities to meet the different needs of users of network capabilities.