Research On Key Technologies In Multi-domain Code Group Routing Network For SDN

With the increasing demands of network users,the volume of network services has grown rapidly and is increasingly integrated.Traditional optical switching networks are evolving towards multi-layer,multi-domain and soft control switching.This paper is oriented to Software Defined Network(SDN),based on Generalized Multiprotocol Label Switching(GMPLS)and optical code granularity switching,the multi-domain switching of multi-granularity Code Group Routing Entity(CGRE)switching networks is studied.By adopting the Path Computation Element(PCE)controller in SDN technology,the intelligent control of the multi-domain code group routing optical network is realized,which promotes its development in the direction of Software Defined Optical Network(SDON).This article mainly studies the key technology of SDN-based multi-domain code group routing network.The specific contents are as follows:Firstly,how to integrate multi-domain code group routing optical network with SDN technology is studied.In the three-layer multi-granularity switching system based on optical code division multiplexing,the concept of CGRE switching was introduced to form a code group routing network,and on the basis of GMPLS distributed control,joined the SDN idea to achieve centralized control of multi-domain networks.By deploying stateful PCE,a multi-domain code group routing network architecture based on hierarchical stateful PCE is formed,and the integrated control plane and business process are analyzed.Then,the multi-domain exchange in the code group routing network is studied,and the PCE architecture is fully utilized according to the characteristics of the network.It is proposed to perform CGRE routing between multiple domains,so as to realize the establishment of CGRE pipes between domains;combining the traditional resource configuration method with PCE technology,a multi-domain parallel processing optical code configuration scheme is designed.According to the designed architecture,the standard PCE communication Protocol(PCEP)is extended to support multi-domain code group routing networks.Finally,the advantages and key technologies of the code group routing network are simulated,analyzed,and verified.Use software Matlab to simulate and compare the port number and throughput of the code group routing and switching system;simulated the specific process of establishing a code group routing pipeline between domains,and simulated and analyzed the delay advantages of the optical code configuration for multi-domain parallel processing;and using the packet capture software Wireshark to verify the expanded communication protocol,it shows that it can be applied to multi-domain code group routing network.