Fig 2 ETSI NFV architecture a NFV infrastructure NFVI NFVI consists of the

Fig 2 etsi nfv architecture a nfv infrastructure nfvi

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Fig. 2. ETSI NFV architecture a ) NFV infrastructure (NFVI) NFVI consists of the hardware resources including servers and storage/networking facilities, and virtual re- sources including Virtual machines (VM), virtual nodes and virtual links. Virtual resources are the abstractions of computing, storage and networking resources achieved by using the virtualization layer. b ) Virtual network functions VNFs are software instances of the network functions run on virtual resources such as virtual machines. A single VNF may be composed of multiple sub-functions deployed over multiple virtual machines. The responsibility of the Element management system (EMS) that may be itself a VNF, is the management of one or more VNFs. c ) Management and orchestration (MANO) MANO provides provisioning of the VNFs, and config- uring them and the related infrastructure. The three main components of MANO are NFVO, VIM and VNFM. NFV orchestrator (NFVO) is responsible for cre- ating end-to-end services across multiple VNFs, and man- agement of the lifecycle of network services including: – Registration of the network services in the service catalog along with their required parameters and associ- ated rules; – Creating, querying, updating and deleting the for- warding rules and the sequence of network services; – Creating, scaling, updating and terminating network services. Virtual network functions manager (VNFM) is responsible for the management of the VNFs life cy- cles including creating, scaling, updating, upgrading and terminating the VNFs. The VNFM and EMS both are assigned to manage the VNFs, so the division of respon- sibilities between them may be different in different sce-
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706 Chinese Journal of Electronics 2018 narios. Virtualized infrastructure manager (VIM) manages the resources of the NFVI including software in- ventory, resource allocation, power management, resource reclamation, analysis of NFVI performance issues and data collection for operations such as fault management and performance optimization. In a virtualized environ- ment, the resources are shared among several user ser- vices; therefore, the resource allocation is a complex task and VIM must handle the competing requests and con- straints. d ) Operations support system/Business support sys- tem (OSS/BSS) OSS/BSS provide a management system that help ser- vice providers in deployment and management of end-to- end network services. They are related to ordering, billing, renewal and troubleshooting of the services. The required information for the OSS is provided by EMSs. 2. NFV application scenarios a ) Virtualized middle-boxes A middle-box is any intermediate node on the path between a source and destination that provides func- tions other than the normal standard functions of routers such as route discovery and route selection. Of course, a middle-box is not necessarily a separate physical box; it can be an embedded function of another box. However, it is never the end system of an application session.
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