Research On Network Emulation Scale Expansion Technology Based On Virtual-Real Fusion

In recent years,with the rapid development of information and communication technology and the large-scale deployment of information and communication network,a large number of burgeoning network applications emerge.The protocols and applications of all layers of ICT network must be strictly tested before they are formally deployed in the actual system.Therefore,it is of great significance to build a test network with high fidelity,controllable cost and flexible scalability for network research.The structure of modern ICT network is complex and its construction cost is huge.If all the test networks are built with actual physical equipment,it will cost a lot of manpower and material resources.In order to reduce the cost of building large-scale test network and improve the flexibility and scalability of test network,virtual nodes can be used to build test network.On the other hand,simulation fidelity cannot be guaranteed if virtual nodes are used in all test network nodes.Therefore,this thesis proposes the concept of network simulation based on virtual reality fusion technology.In the network topology composed of actual physical nodes,a large number of virtual nodes are connected to the physical network to form a large-scale network under test together with physical nodes,so as to improve the flexibility,agility and scalability of test network construction,and effectively reduce its construction cost.Based on the related research of network simulation and test cloud of the research group,this thesis innovatively proposes and realizes two schemes of virtual real integration of single physical node based on node mapping and virtual switch,and further optimizes its performance.While realizing physical network access to network simulation and test cloud,container technology is introduced to make efficient use of the underlying physical resources of network simulation cloud.In addition,this thesis proposes a simulation method of virtual real integration of dynamic link based on node mapping,which can simulate random failure events of any node and network port under test.In addition,aiming at the characteristics of complex physical network types and large number,this thesis proposes two scalable and easy to build physical network virtual real fusion schemes for multiple network segments,namely: multi floating IP based and multi segment virtual real fusion scheme based on routing node.Among them,the routing node based solution solves the bottleneck problem of physical network card based on the multi floating IP solution,which can better meet the simulation requirements of virtual real integration of network simulation and test cloud multi segment.This thesis verifies the interoperability of two virtual and real-world fusion schemes based on node mapping and virtual switch by network testing tools.Then,the interoperability of three different segments of multi network segment virtual real fusion scheme based on routing node is verified.Furthermore,the performance evaluation of the above virtual and real-world fusion schemes is carried out respectively,such as delay and bandwidth.In addition,the thesis verifies whether the simulation test cloud can still simulate normally compared with the normal virtual link or physical link after adding virtual and real links through the target simulation scenario in the application case.The experimental results show that the virtual reality fusion simulation scheme can effectively and reliably realize the simulation of physical nodes and virtual instance nodes.