Research On Key Technologies Of Three-layer Multi-granularity Switching Based On Soft Definition

At present,5G technologies are being commercialized one after another,which makes the communication interconnection in the network faster,but at the same time,the rapidly growing data traffic and the demand of the Internet also place more demands on the transmission performance of the optical network.In this context,multi-granularity switching is a technique that can effectively alleviate these problems.But,the traditional multi-granularity switching is distributed control.The network is heavily burdened,and it is easy to cause a node failure,which leads to network paralysis.Therefore,Software Defined Network(SDN)which can realize centralized control emerges as the times require.Using the well-developed Path Computation Element(PCE)as the SDN controller is an excellent choice for today's network to smoothly transition to Software Defined Optical Networking(SDON).This paper mainly studies the key technologies of three-layer multi-granularity exchange based on soft definition.The specific contents are as follows:Firstly,the traditional three-layer multi-granularity switching technology is introduced.Based on this,Optical Code Division Multiplexing(OCDM)technology is introduced and the concept of Code Group Routing Entity(CGRE)is given to form a code group routing network.And introduce the SDN idea in the code group routing network based on distributed control,so as to centrally control the entire network,thereby better forward the service.Secondly,the survivability of the code group routing network is described: protection and recovery,and the protection algorithm based on Shared Risk Link Group(SRLG)is studied.First introduced the protection recovery mechanism,and then a protection algorithm based on SRLG is studied for the protection of code group routing network.Based on this,a dynamic protection algorithm based on SRLG is proposed to reduce the network blocking rate while ensuring the normal forwarding of services.Finally,PCE protocol(PCEP)related information is extended to support network protection.Finally,the system performances such as port number and packet loss rate of the code group routing network system is simulated and verified.The system performances such as port number and packet loss rate of the code group routing network system are simulated and verified.The research algorithm is researched and analyzed,and the extended PCEP is captured and analyzed.The performance of the system,algorithm and the feasibility of the protocol are verified by simulation analysis.