Research And Evaluation Of Sdn Super Controller

The rapid development of the Internet has brought colorful applications to users,and the growing business needs of users have also brought new challenges to network architecture and its technology.In this wave of development,optical transport networks face many challenges,including large network expansion pressure,complex operation and maintenance management,difficulty in cross-layer management,and slow development of new services.As a new type of network architecture,software-defined network SDN has been recognized and widely used.How to apply SDN to the optical transport network to solve the above problems has become a major challenge faced by network service providers and operators.The development direction of the SDN control plane has experienced a transition from improving the controller performance to the more scalable distributed system direction.The hierarchical SDN network will become the development trend of the SDN control plane.In addition,the standardization work of the northbound interface TAPI2.0 and the northbound interface ACTH of the transport network is rapidly advancing.Combining the development trend of SDN control plane and the latest achievements of northbound interface standardization,it is very important and practical to study the cooperative control of SDN in optical networks.In view of the above discussion,this paper designs an SDN cooperative control scheme,and uses the latest standard northbound interface TAPI2.0 and ACTN to complete the networking implementation and evaluation of the collaborative control scheme optical transport network scenario.The main research work of this paper includes the following points:(I)An SDN collaborative control scheme is designed,which includes four parts:web network management application,collaborative controller,northbound interface and single domain controller.In this solution,each SDN domain is managed by its own controller,and the communication between the SDN domains is handled by the upper-layer collaborative controller;the northbound interface uses the latest transport network standard northbound interfaces TAPI2.0 and ACTN.(2)A super controller was developed in conjunction with the requirements of the OTN optical transport network.The Nodejs programming environment is used to support efficient parallel acquisition of massive network element information.In addition,the collaborative controller realizes flexible support to the northbound interface through the model parsing module.It only needs to provide the YANG model description of the northbound interface,and complete the programming call of the northbound interface of the collaborative controller by programming and parsing the model language structure.(3)According to the collaborative control scheme and super controller designed in the paper,the TAPI2.0 and ACTN networking implementation of the collaborative control scheme is completed.The domain controllers of different vendors in the United Nations set up an optical transport network scenario experimental platform to evaluate the collaboration proposed in the paper.Control plan.Through the implementation of the specific functional modules of the northbound interface,the evaluation of the effectiveness of the collaborative control scheme is completed.In the networking process of the collaborative control scheme,a functional test method of the standard northbound interface is also formed.The RESTServer programming is used to simulate a single network domain,and the functional interaction of the RESTful style northbound interface is emphasized,and the implementation of the single domain network is ignored.The automated programming analysis of the interface YANG model simplifies the testing of the standard northbound interface.