Research On Survivability Of Software Defined Packet Enhanced Optical Transport Network

In recent years, with the development of new services, such as cloud computing and large data, packet-enhanced optical transport network is imperative to cope with the explosive growth of traffic caused by emerging services, which becomes the main research direction of next generation optical transport network. At present, the traditional telecommunication network architecture adopts the distributed control mode. In the face of the complex network structure of the packet-enhanced optical transport network, it is difficult to carry out uniform resource allocation and management. The emergence of software-defined network is to solve this big problem. In the packet-enhanced optical transport network, based on the idea of unified scheduling of multi-layer fusion, how to realize the survivability coordination mechanism between multi-layer networks and improve the cooperation and sharing performance of inter-layer backup resources and reduce the cost of protection resources is the key issue.In this paper, the overall architecture, protocol extension and control interface of the packet-enhanced optical transport network are deeply studied. Finally, based on the multi-layer network survivability mapping mechanism of the packet-enhanced optical transport network. The virtual link and virtual network survivability mapping algorithm of shared risk link group are simulated and analyzed. The main work and innovation are as follows:In order to improve the utilization rate of packet-enhanced optical transport network resources, a SD-POTN architecture based on hierarchical OpenFlow controller is proposed to realize multi-layer resource scheduling for packet-enhanced optical transport network.Through the multi-domain controller and single-domain controller to achieve mutual cooperation between the software-defined packet-enhanced optical transport network resource allocation optimization.Second, for the multi-layer resource integration and allocation, the protocol and control interface of the software-defined packet-enhanced optical transport network are extended. This paper mainly expatiates on the extension of OpenFlow protocol under software defined packet-enhanced optical transmission network, the concrete flow and protocol analysis of multi-layer resources in the north-south interface transmission, and the resource collection and routing mechanism flow under packet-enhanced optical transport network A detailed description.Third, Aiming at the problem of packet survivability mapping in packet-enhanced optical transport network, this paper proposes a virtual-link and virtual-network survivability mapping algorithm based on maximum sharing capacity for software defined packet-enhanced optical transport network. Simulation results show that two new survivability mapping algorithms can better optimize the performance of optical network services.