Research On SRv6 Incremental Deployment Mechanisms For Integrated Converged Network

In the context of the long-term coexistence of the 4th and 5th generation mobile communication technologies(4G and 5G),with the maturity of segment routing(SRv6)protocol standard based on IPv6 forwarding plane,the integration of mobile bearer network SRv6 and traditional network has been highlighted.Research on unified resource coordination control and adaptation technology is a special sub-subject under the "Integrated Converged Network" project of National Key R&D Program of China.In the integration converged network,the traditional network architecture structure is complex,the existing route path planning with the jump number or path measure as the routing basis,minimum hop count fixed delay and link congestion cause that the minimum number of paths is not the best path,which cannot guarantee load balance of deterministic routes.The Segment Routing(SR)architecture is based on source routing,where the source node selects a path and directs the packet along that path across the network.The introduction of SRv6 architecture in the integrated converged network can make full use of the path characteristics of the network,and the controller delivers an efficient route allocation scheme to improve the programming and controllability of the network.Since it is difficult to deploy a large-scale complete SRv6 network,the hybrid IP/SRv6 network consisting of SRv6 nodes and traditional IP nodes becomes the preferred scenario for network upgrade.This dissertation mainly studies network traffic engineering based on hybrid IP/SR network from two aspects of load balancing and resource control.The main work of the dissertation is as follows:(1)From the aspect of load balancing,firstly,analyzing the routing mechanism of hybrid network,under hybrid network,designing a packet forwarding mechanism.And on that basis,this dissertation proposes a path planning algorithm WA-TE(Weight Adjustment-Traffic Engineering)based on minimizing the network maximum link utilization in the scenario of hybrid IP/SRV6 networks.A mathematical model for path optimization in hybrid IP/SRv6 network scenarios is established,and the problem is defined as an exact three-cover problem,and the complexity of the problem is proved.Link weight optimization is combined with SRv6 node shunting constraint optimization(by node shunting control to close the appropriate links and concentrate traffic on as few links as possible),and the complexity and acyclic routing of the algorithm is proved.At the same time,this dissertation set up an OPNET simulation system to analyze the algorithm.Experimental results show that the WA-TE joint optimization algorithm based on link weight and node shunting optimization can effectively reduce the maximum link utilization rate of the network,reduce the network congestion,and have good network benefits,which confirms the effectiveness and feasibility of the WA-TE algorithm.(2)From the perspective of resource management and control,this dissertation establishes the CA(Control Ability)maximization model and node priority ordering model respectively for incremental deployment of SRv6 nodes,with the optimization objective of minimizing the maximum link utilization of the network.This dissertation studies two incremental deployment schemes of SRv6 nodes,namely,the incremental deployment scheme based on Maximized Utilization/Control Ability(MAX＿U/CA,Maximized Utilization/Control Ability)and the incremental deployment scheme based on node priority(NP,Nodes Prioritization,which supports network traffic load balancing from the perspective of resource control.The experimental results show that the incremental deployment algorithm MAX＿U/CA based on traffic control capability optimization can provide better support for the routing optimization algorithm in mixed IP/SRv6 network scenarios than the incremental deployment strategy NP based on node priority,effectively optimize the traditional network,reduce network congestion,and optimize network performance.