SN 国家重点实验室 Chapter Three Network Function Virtualization 3.1 concepts and architecture of NFV 3.2 application and research challenges 2020/5/21 Dr. Zhanqi XU, National Key Lab on ISN,Xidian University
N 国家重点实验室 1.background and motivation Trends Mobility,explosion of devices and traffic Application of cloud services ● High performance industry standard servers shipped in very high volume ● Convergence of computing,storage and networks ● New virtualization technologies that abstract underlying hardware yielding elasticity,scalability and automation ● Software-defined networking technique and NFV need each other,which also makes beneficial to each other 2020/5/21 Dr.Zhanqi xu,National Key Lab on ISN,Xidian University 2
-continued 国家重点实验室 Challenges ● CapEx:Huge capital investment to deal with current trends ● OpEx:Network operators face an increasing disparity ( between costs and revenues ● Complexity:large and increasing variety of proprietary hardware appliances in operator's network ● Reduced hardware lifecycles ● Lack of flexibility and agility:cannot move network resources where when needed ● Launching new services is difficult and takes too long.Often requires yet another proprietary box which needs to be integrated into existing systems 2020/5/21 Dr.Zhangi xu,National Key Lab on ISN,Xidian University 3
Network Functions Virtualization NFV)is about implementing network functions in software that runs today on proprietary hardware,leveraging( 对..产生巨大影响)(high volume)standard servers and IT virtualization ● Supports multi-versioning(看法、观点)and multi--tenancy of network functions ● Allows use of a single physical platform for different applications,users and tenants ●Enables new ways to implement resilience(弾性)，service assurance,test& diagnostics and security surveillance(监督) O Facilitates innovation towards new network functions and services that are only practical in a pure software network environment Applicable to any data plane and control plane functions (fixed or mobile networks) Automation of management and configuration of functions is important for NFV to scale NFV aims to ultimately transform the way that network operators architect and operate their networks even though change will be incremental
N Network Functions Virtualization:Vision 国家重点实验室 Classical Network Appliance Network Functions Virtualisation Approach Approach Independent Software Vendors Competitive Innovative Virtual 新rtual Virtual Virtual Message CDN Session Border WAN Appliance Open Ecosystem Controller Acceleration Router Virtual Virtual Virtual 0.O Orchestrated, DPI Firewall Carrier Tester/QoE automatic remote install. Grade NAT monitor High volume standard servers MG Router BRAS Radio/Fixed Access Network Nodes High volume standard storage 。 Fragmented,purpose-built hardware. Physical install per appliance per site. Hardware development large barrier to entry for new vendors,constraining innovation High volume Ethernet switches competition. Natinat Key Eub on I3N,Xidian University 5
Benefits of NFV 国家重点实验室 Flexibility to easily,rapidly and dynamically provision and instantiate ( new services in various locations (i.e.no need for new equipment install) ●】 Reduced time-to-market by minimizing the typical network operator cycle of innovation.More service differentiations(差异化)&customizations(订制) ● Improved operational efficiency by taking advantage of the higher uniformity of the physical network platform and its homogeneity(同构性)to other support platforms ● Reduced equipment costs through equipment consolidation on high volume industry standard servers,leveraging the economies of scale of the IT industry ● Reduced operational costs:reduced power,reduced space,improved network monitoring ●】 Software-oriented innovation(including Open Source)to rapidly prototype and test new services and generate new revenue streams ● IT-oriented skillset and talent(readily available in global geography,flexible)
2.Concepts and Virtualized Network Functions(VNFs) Architecture VNF VNF VNF VNF >Network Functions Virtualization (NFV) envisages the implementation of NFs as NFV Infrastructure(NFVI) software-only entities that NFV Management run over the NFV and Infrastructure (NFVD). Virtual Virtual Virtual Orchestration computing storage network Virtualization Layer The Figure on the right illustrates the high-level NFV framework.As such, three main working Computing Storage Transport hardware hardware hardware domains are identified in NFV: Figure 7.7 High-Level NFV Framework 2020/5/21 Dr.Zhangi xu,National Key Lab on ISN,Xidian University 7
国家重点实验室 Virtualised Network Function (VNF#)can be regarded as the software implementation of a network function which is capable of running over the NFVI. NFV Infrastructure (NFVI#)includes the diversity of physical resources and how these resources can be virtualized.NFVI supports the execution of the VNFs. NFV Management and Orchestration (MANO#管理编排)，which covers the orchestration and lifecycle management of physical and/or software resources that support the infrastructure virtualization,and the lifecycle management of VNFs.NFV Management and Orchestration focuses on all virtualization-specific management tasks necessary in the NFV framework. 2020/5/21 Dr.Zhanqi xu,National Key Lab on ISN,Xidian University 8
OSS/BSS:Operations Support Systems and Business Support Systems NFV Management and Orchestration Os-Ma EM:Element Management OSS/BSS NFV Orchestrator performs the typical Or-Vnfm management functionality for Virtualised VNF Infrastructure Managing: Service, EM1 EM2 EM3 one or several VNFs. Ve-Vnfm VNF and VNF Infrastructure Manager(s) Description VNF 1 VNF Virtualization Layer: Vi-Vnfm > Abstracting and logically Virtual Virtual Virtual partitioning physical resources, Computing Storage Network Nf-Vi Virtualised Or-Vi commonly as a hardware Virtualisation Layer Infrastructure 8 Manager(s) abstraction layer. Hardware resources Computing Storage Network Hardware Hardware Hardware Enabling the software that implements the VNF to use the Execution reference points Other ref缸ence point由 Main NFV reference point underlying virtualized Figure 4:NFV reference architectural framework infrastructure. Providing virtualized resources to the VNF,so that the latter can be executed. 2020/5/21 DE.Lnangi xu,National Key Lab on ISN,Xidian University 9
N 国家重点实验室 NFV Management and Orchestration Os-Ma OSS/BSS NFV Orchestrator NFV Orchestrator:Automates the deployment,operation, Virtualised VNF Infrastructure Managing: Or-Vnfm management,coordination of VNFs Service, EM1 EM2 EM3 Ve-Vnfm VNF and and NFVI. VNF Manager(s) Infrastructure Description VNF1 VNF 2 VNF 3 wn- Vi-Vnfm VNF Manager(s):is Virtual Virtual Virtual responsible for VNF lifecycle Computing Storage Network Nf-Vi Virtualised Or-Vi Virtualisation Layer Infrastructure management (e.g.instantiation, 8 Manager(s) update,query,scaling, Hardware resources Computing Storage Network Hardware Hardware Hardware termination). Execution reference points Other reference point由 Main NFV reference points Figure 4:NFV reference architectural framework VIM:Virtualized Infrastructure Manager:Management of computing,storage,network, software resources 2020/5/21 Dr.Zhangi xu,National Key Lab on ISN,Xidian University 10