Research On Segment Routing In Software-defined Backbone Networks

In recent years,network services have achieved rapid development and revolution.For instance,the commercialization of 4G and 5G has greatly improved the quality and functions of services in mobile networks.And the development of cloud computing facilitates the deployment of network services.The acceleration of the deployment of satellite networks pro-motes the integration of space and earth.And the rise of smart terminal equipment opens up the era of the interconnection of things.The backbone network is the foundation and core carrier of these services.However,for the backbone,due to the large scale,multi-domain interconnection,and high update costs of protocol,its development and evolution lags behind network services,which conflicts with the requirements of emerging ser-vices,gradually becoming the bottleneck of network services.This article focuses on the emerging network services requirements,conducts in-depth research on the software-defined technology of the back-bone network,proposes solutions to the contradiction between the charac-teristics of the backbone network and the requirements of emerging ser-vices,and promotes the software-defined process of the backbone network.This article first faces the fine-grained and high-precision traffic scheduling requirements of user services for the network,specifically the performance problem of G-SRv6(Generalized SRv6)that the SRv6(Seg-ment Routing over IPv6)policy list been compressed.A dual-function dynamic marking and optimization method for G-SRv6 network was pro-posed.This method deeply analyzes the functional characteristics of the SRv6 segment,and logically splits the functions of the SRv6 segmen-t according to its characteristic behavior,and designs a dynamic double-marking mechanism to provide independent and dynamic assignability for the split functions.This splitting allows for dynamic allocation of labels indicating routing behavior,and at the same time ensures that the routing decision is not affected,and provides a protocol basis for G-SRv6 compres-sion performance optimization.Based on the long and short-term memory neural network,a sequential hop-pair snapshot optimization algorithm is designed to compute the compression policy.The simulation results show that the proposed scheme can effectively improve the probability of traffic compression in G-SRv6 and the compression rate in the case of compres-sion.It can provide more scheduling information-carrying capacity for source routing,and further improve the scheduling accuracy of network traffic.Then,oriented to the functional requirements of network services,fo-cusing on the active one-to-many transmission function,this paper carries out for the stateful and stateless scenes in the backbone network.For s-tateful scenarios,source-multicast is proposed,which provides users with the ability to initiate and fully manage sessions.In the source-multicast,a virtual group mechanism is designed to remove the strong coupling be-tween the traditional multicast group and the multicast service.The form of the virtual group ensures the independence of session management and session transmission,and at the same time provides users with the ability to initiate sessions.In order to support the user's completeness of ses-sion management and ensure the security and transparency of the network,a message control mode is designed to manage group members and ses-sions.In the message control mode,the user is the initiator of all session management operations,and the network is the authenticator and actual executor of the management operations,which maintains transparency to the user.Districast is proposed for stateless scenarios,which provides the network with stateless one-to-many conversation capabilities.We design the parallel processing logic directly based on SRv6,and design multi-ple brand-new functional SRv6 segments to provide data plane support for users to carry and process multi-destination addresses.For multicast trans-mission,multi-destination address indication transmission is designed.For the newly designed SRv6 segment,the multi-destination address carried is clustered representation of the routing behavior,and the clustering infor-mation is inserted into the data packet.Based on P4 and real switches,the prototype system implementation and simulation test are carried out.The results show that source-multicast and Districast can bring proactive one-to-many transmission function with acceptable cost,and compare the state utilization and transmission processing cost.The existing solutions have certain advantages,which bring the one-to-many transmission func-tion strongly coupled with the network to the backbone network,and pro-mote the functional evolution of the backbone network.Finally,this paper focuses on the diversified requirements for service quality in the backbone network,specifically the independent quality of service(QoS)guarantee of bandwidth and delay.We propose a central-ized queue QoS with bandwidth-delay decoupling.The guarantee model can provide actual guarantee capabilities for user service requirements for APN6(Application-aware IPv6 Networking).The solution is oriented to the queue management of network nodes,and a queue delay management scheme is proposed.This scheme completes the guarantee of the quality of service for the bandwidth inside the queue,and through the management of the scheduling relationship between the queues,it realizes the differen-tiated service for the queue delay and ensures that the bandwidth guarantee is not affected.The solution designs the comprehensive parameter Dijk-stra routing algorithm,which provides differentiated services for the user's propagation delay from the routing calculation,and comprehensively con-siders a variety of parameters to make routing decisions,which can better balance the traffic and improve the overall quality for services and the car-rying capacity for networks.The simulation results show that the proposed scheme can achieve the independence and effectiveness of bandwidth and delay performance guarantee,can bring more service carrying capacity to the network,and can improve the overall service quality of high-priority services.