Research On Collaboration And Reconfiguration For Multi-Domain Networks

The future network faces the constant access to smart devices,emerging new services,increasing user network traffic demands and the transition from traditional enterprise networks to cloud computing networks.This requires a network that can carry massive amounts of network data,provide customized user services,and be highly reliable and cost effective.However,the highly heterogeneous network,the large scale of the network and the wide variety of underlying devices make it difficult to implement flexible and unified management of the existing vertically integrated network architecture.The research content of this paper is to collaboration and reconfiguration for multi-domain networks,and realize the purpose of flexible management and control heterogeneous networks in multiple domains(such as IP domain,transport network domain and passive optical network domain),and change the traditional manual modification of operation support system(Operation Support System,OSS),complete intelligent automation and control,thereby improving the efficiency of network service deployment and saving network operation costs.At the same time,network failure recovery in network service management is also a problem that cannot be ignored.Network failure will bring huge losses to operators and users.At present,the optical network fault recovery algorithm mainly provides a recovery path for faulty services by improving network resource utilization.When the network resources are insufficient,the services affected by the fault cannot be recovered quickly and effectively.This paper studies these two aspects,the main innovative results are as follows:(1)In order to meet the needs of multi-domain network collaborative management and control,and to solve the difficulties of collaborative management and control,we design a hierarchical multi-domain network collaborative management and control architecture that is supported by SDN technology and is easy to expand,efficient,flexible an d open.The management and control architecture consists of the application plane,control plane and data forwarding plane,which realizes the communication interface design and information format unification between the planes.The architecture has the characteristics of shielding the underlying devices,and supports open interfaces to the application plane to achieve flexible control of the entire network.On the other hand,the inter-domain network resource co-scheduling and global resource optimization strategies are formulated,and the collaborative controller and the domain controller are designed on the network control plane.The network information fusion aggregation module in the collaborative controller is configured to receive network resource information of each domain,and simultaneously collect and collect network resources between the domains.At the same time,the architecture provides a visual network global map with its unique resource configuration strategy to support optimal network resource scheduling.The multi-domain network management architecture can automatically acquire the entire network topology,support the flexible configuration of network resources,and uniformly control the virtualized resources,for example,setting multiple ports of the hardware switch to match multiple virtual network domains and real-time management monitoring network services.(2)In view of the fact that the IP network load in the IP+optical network architecture is too high and the network resources are insufficient to recover the network fault.In order to enhance the survivability and the invulnerability of the network,it is proposed to dynamically adjust the optical link and reconstruct the network link capacity to recover the network fault.Considering the constraints between the bandwidth requirements of the damaged service,the remaining amount of network resources,and the expansion cost of the network nodes,the solution to recover the damaged service with minimum expansion cost is studied.This section proposes two genetic algorithm-based fault recovery algorithms,namely"path-based recovery algorithm"and"link-based recovery algorithm".Compared with the static network expansion recovery algorithm,these two algorithms achieve the goal of effectively recovering network failures at low cost with their advantages of global resource optimization and inherent parallelism.