Research And Implementation Of Tenant Virtual Network Generation System Based On ONOS

With continuous development of the Internet,the network has entered an era of rapid change.With the continuous increase of network users and network services,the network configuration items have become more and more complex.The SDN-based network virtualization technology has become an important technology in today's network construction.However,most of the network components and models in today's virtual network platform are abstracted from the bottom to the top based on the underlying physical network,so that the tenants can not shield the underlying physical details when constructing the virtual network.The platform uses programming or model language to describe the model,which increases the learning costs of tenants in building a virtual network;that is,there is a problem that the tenant's intention is hard to express in the virtual network system.In view of the above problems,this paper studies and designs a virtual network abstract data model based on tenant's intention.The main research contents of this paper are as follows:(1)According to the intension of the tenants based on the virtual network,this paper studies the network construction strategy and the common network scenarios.Through mining the relationship among the strategic objects,the virtual network abstract data model based on the tenant's intention is studied and designed from tenants,networks and results.The paper elaborates on the relationship between the models.The data verified that the data model helps the tenants shield the underlying physical details and greatly reduces the tenant building steps.(2)In terms of the model description,this paper abandons the traditional way of programming and model language.Through analysis of the visualization requirements of the models and the relationships among models,the paper turns to describe the model in a visual way and treat them as components which will improve the reusability,scalability and usability of the intent model;(3)The paper applies the model to the ONOS platform.The ONOS-based tenant virtual network generation system is designed and implemented.The northbound layer of the system calls the visual model library of the model,and the southbound interface connects to the NEMO engine to realize the mapping of the virtual network to the physical network.The system includes network custom module and tenant management module,which improves the scalability and security of the system.The test proves that applying the abstract data model based on tenant intension to the virtual network generation system and describing it in a visual way can improve the tenant building speed by about 30%over the underlying model-driven system under the scenario similar to single-switch and multi-subnet virtualization.With the construction of the network becomes more and more complex,the advantages of the model in the shielding of the underlying physical details are also gradually realized;The tenants' satisfaction with the usability of the system reached 84.91%,thus proves that the abstract data based on the intention of the tenant can be applied in a virtual network generation system to solve the problem that the tenant intention is difficult to express.