The Research And Design Of Openflow-Based Unified Control Plane For Ip And Optical Transport Network

With the high-speed development and popularization of information network, the expansion of network scale and the demand growth of various broadband services, the extisting rigid, closed, complex&heterogeneous network cannot provide efficient&dynamic network services matching with the increasing demand. And the agile, open, simple&programmable Software Defined Network (SDN) proposes a new network architecture and revolution to solve the current network bottleneck, and OpenFlow is the one implemented protocol as SDN south interface. Meanwhile, because now IP and optical transport network (OTN) generally are separate hierarchies and individually controlled, and have obviously different network architectures, switching technologies and control&management mechanisms, the collaboration between the IP layer and OTN layer is difficult so that it makes the network fragile, poorly scalable, inefficient and low resource utilization rate. Therefore this paper focus on the research of OpenFlow-based unified control plane for IP and OTN, which can unified control the IP and OTN as a global network view rather than isolated hierarchy so that this unified collaboration makes the network performance optimized, scalable, efficient and high resource utilization rate.The main research and work of this paper around the key technology of OpenFlow-based unified control plane for IP and optical transport network are as follows:(1). The network architecture and unified control mechanism for unified controlling IP and optical network based on Openflow have been analyzed and designed. In the base of typical SDN architecture composed of application plane, control plane and infrastructure data plane, the network architecture of the unified controlling IP and OTN based OpenFlow has been designed. In addition, under the unified control network architecture unified control mechanism including unified control packet switching and circuit switching, unified abstract and unified path control have been detailed analyzed and designed in order to achieve the basic unified controlling functions.(2). Based on the above unified control network architecture and control mechanism, The requirement analysis of the unified control plane for IP and OTN based on OpenFlow has been completed, and the overall scheme including the specific each function module and the information interaction of the unified control plane has been designed.(3). The requirement analysis of the OpenFlow communication process module of unified control plane has been accomplished. Then the specific module functions aimed to connection process between the unified control plane and network nodes, receive, parse&forward and encapsulate&send OpenFlow messages have been programmed and developed. Additionally, the simulate test this implemented module has verified the correct feasibility.