Research On Southbound Interface And Control Plan Of Software Defined Optical Networks

As a result of big data and cloud computing,data center applications have presented high-burst and high-bandwidth characteristics.The characteristic of optical network's high-bandwidth and virtualizing network's dynamic distribute resources plays an important role in meeting those demands.Also,the software defined networking(SDN),as an concrete method to carry out,already implement the network virtualization,that is the combination of optical network and IP network become software defined optical network.Software defined optical networks(SDON)based on SDN and optical networks,combine the advantage of optimizing fragmentation of specific resources of optical networks and great bandwidth,provides an unified control platform for multiple networks.Besides,OpenFlow,an open specification of SDN,can be used to define optical network.In this thesis,based on the investigation of software defined optical networks,we extend the OpenFlow protocol and implement the control of optical network,following are our main work:From the view of service distribution,we proposed and implement a scheme of software defined optical networks architecture.And discussed the principle of this scheme with different demands(e.g.bandwidth)in varies situations.Furthermore,we considered the infusion scheme of IP networks and optical networks,designed the southbound interface to deal with network resources allocation,provided a uniform view of both IP and optical networks and solved the unified control problem on the edge of optical and IP networks.On the aspect of control plane of SDON,a better way to configure optical networks for SDON is also introduced:adopting Kruskal algorithm instead of Dijstra algorithm.Investigate the abstraction design of optical network southbound interface,which is based on TDM and various services.On the one hand,abide by OpenFlow and characteristic of OTN device,we discussed the principles of tributary slot information in optical port information fields getting from electric domain switch information of OTN devices.On the other hand,through extension of the OpenFlow protocol of optical network,we provide solution for the optical routing assignment and implement optical signal routing forwarding rules.We have implemented a software defined optical networks simulation environment based on the scheme of SDON architecture,and verified the feasibility by achieving optical abstract information from northbound interfaces of SDON controller and package captures which indicate the consistency with the design of OpenFlow optical extension.Meanwhile,a visual interface is achieved on the base of SDON controller(OpenDaylight).All of above have proved the feasibility of the scheme.Software defined optical networks(SDON)has significant influence in both theoretical and applicational fields.In the future,we will concentrate on a combination of electrical and optical switching based on different conditions to get a better performance.