Research On Virtual Network Mapping Based On SDN Environment

Nowadays,Internet technology is more and more developed,but it can no longer meet the higher needs of users.The traditional network architecture has become a bottleneck,and its rigidity has become increasingly prominent.The idea of network virtualization has made great progress in changing the traditional problem of rigid network,but traditional networks cannot meet this requirement well.At this time,a new type of network architecture is Software Defined Networking.,The emergence of SDN)undoubtedly brings hope for the traditional network.As a new type of network architecture,it breaks down the traditional idea of network closure by layering the network.SDN separates the control plane from the forwarding plane,thus overcoming the traditional network.Due to the closed nature of the network element device,it can not be programmed,which makes it more flexible to use,allocate,and manage and maintain network resources,and also makes the network technology innovation develop more.The paper first analyzes the technical characteristics and research status of network virtualization and SDN.The existing mapping algorithm does not consider the adjacency relationship between nodes in the mapping process.It will cause the distance between the nodes after mapping to increase,resulting in many The resources are wasted and the resource cost of the virtual network mapping is increased.Therefore,this paper improves the virtual network mapping algorithm based on software-defined network.The algorithm uses the width-first traversal method in the graph theory algorithm and controls the mapping order of the nodes.Its main purpose is to reduce the length of the mapping path under the virtual link mapping to reduce unnecessary network resource overhead.Then,the underlying network may fail and make necessary countermeasures to perform virtual network remapping to ensure fault tolerance of the network.The algorithm first performs a resistant sort on the physical nodes,and then includes the failure of nodes and links for SDN physical faults.,using a backup-based remapping method for recovery.Finally,the results of simulation experiments show that the improved virtual network mapping algorithm has greatly improved the virtual network request acceptance,network revenue and cost ratio,average control delay and failure recovery rate compared with the traditional mapping algorithm.As far as the virtual network remapping algorithm is concerned,under the premise of satisfying node resource requirements and node invulnerability,the resource cost of the underlying physical network can be effectively reduced,thereby improving the success rate of virtual network mapping.