Design And Implementation Of Software Defined Optical Network South Interface PCEP

In recent years,traditional networks have become increasingly difficult to meet the relatively more flexible resource needs of a variety of related emerging businesses.All of these promote the development of various network technologies towards efficient collaboration and mutual integration.The integration of optical network technology and the hot software-defined network SDN technology has also become an important trend of network evolution.This paper investigates the current development status and business requirements of the software-defined optical network south-facing interface,studies the software-defined optical network architecture and related technologies,combines the research results at home and abroad,designs and implements the extension of PCEP for software-defined optical network to the characteristics of two-way SR tunnel,and designs and implements a traffic dispatching system to solve the channel blocking problem in this network..The details are as follows:(1)Extended design and implementation of PCEPPCEP,as a path calculation protocol widely used in existing networks,can only create a native one-way SR tunnel at present.This paper extends the design of PCEP by adding related objects to PCEP messages to support the creation of bidirectional SR tunnels.This paper completes the development and implementation of the above extensions based on the Opendaylight controller,and completes the corresponding functions in each module.Then a simulation system is set up to communicate with PCEP,and the PCEP message is captured by the Wireshark software for verification.(2)Design and implementation of flow release system based on single controllerWhen SDN network is attacked or other reasons lead to large-scale traffic anomalies,which can cause channel blocking between the controller(PCE)and the device(PCC).This paper designs and implements a flow mitigation system to solve this problem.By taking advantage of the advantage that controllers can obtain network-wide topological information,the system dispatches large-scale abnormal traffic to switches in the network that cause the least traffic pressure to the controllers,thereby reducing the communication pressure between the controllers and switches with abnormal traffic,and reducing the risk of channel blocking between them.Finally,its functionality is verified by building a simulation system.