5 minutes to learn about nfv

NFV It's a network architecture , It is based on virtualization technology to virtualize network function nodes into functional modules that can be linked together to provide communication services .NFV Committed to changing the way network operators build their networks , Through virtualization technology, various network components can be applied independently , It can be flexibly deployed on standards based servers 、 Storage 、 Switches are built on a unified platform , In the data center 、 Deployment and configuration of network nodes and clients .NFV The network functions can be made into software , To run on industry standard servers , Software based function modules can be migrated or deployed in multiple locations in the network without installing new devices .

One 、NFV The functional structure of

NFV Its technical framework includes the following parts ：NFV infrastructure （NFVInfrastructure,NFVI）、 Virtualized network functions （Virtual Network Function,VNF）, as well as VNF Management and arrangement module etc. . among ,NFVI Physical computing through the virtualization layer 、 Storage and network resources are transformed into virtual computing 、 Storage and network resources , And put them in a unified resource pool .

VNF Virtual computing 、 Virtual storage 、 Virtual network resources , And network element management for managing virtual resources （Element Management,EM） Software, etc .VNF It is a module that can be combined , Every VNF It can only provide limited functions . For a particular data flow in a particular application , You can combine multiple different VNF Arrange and set , Form a network to complete the network functions required by users VNF Service chain .NFV The management and arrangement module is responsible for arranging 、 Deployment and management NFV All virtual resources in the environment , Include VNF Create an application instance ,VNF Service chain arrangement 、 Monitoring and migration , And shutdown and billing .

Two 、NFV Architecture of

NFV The architecture of can be divided into infrastructure layer 、 Virtual network layer 、 Operation support layer .

• Infrastructure layer

NFVI Responsible for allocating and managing virtual resource environment and underlying physical resources . This layer contains x86 The server 、 The storage device 、 Physical resources such as switches , Transform physical resources into virtual computing through the virtualization layer 、 Virtual storage and virtual network , And put them in the resource pool .

• Virtual network layer

The virtual network layer consists of VNF、EM And NFVO form . Each physical network element is mapped to a virtual network element VNF; One VNF The required resources are decomposed into virtual computing 、 Storage and network resources , Can be deployed on one or more virtual machines . Virtual network element VNF from VNFO To provide .NFV The management and arrangement module of the system mainly includes virtual device manager （Virtual InfrastructureManager,VIM）、VNF Manager （VNF Manager,VNFM） And VNF Choreographer （VNFOrchestration,VNFO）.

• Operation support layer

The operation support layer is mainly composed of the operation support system （Operation Support System,OSS） And business support system （Business Support System,BSS） form .OSS Also called operation support system .OSS And BSS A lot of software in the system covers the infrastructure 、 Network function , And support the end-to-end orders of various telecommunication services 、 bill 、 The contract 、 Management system required for troubleshooting .

3、 ... and 、NFV Infrastructure of

NFV The infrastructure consists of 3 Component composition ： Computational domain 、 Hypervisor domain and infrastructure network domain .

• Computational domain ： Provide users with a large number of servers and storage facilities .
• Admin domain ： Transform computing and storage resources in the computing domain into software configurable virtual machines .
• Infrastructure network domain ： By a large number of routers 、 Switch and other network equipment , Convert to virtual network resources through virtualization layer .

Four 、NFV Node type of

• Computing node

A computing node is a functional entity that can execute a set of general computing instructions . Regardless of the specific state of these instruction sets at the time of execution , The execution cycle is only a few seconds to tens of nanoseconds . In practical terms , It is defined in terms of memory access time . A distributed system cannot meet the execution cycle requirements , The access time to the remote memory state has exceeded this time .

• Gateway nodes

The gateway node is NFVI The unit in the node that implements the gateway function . The main function of the gateway is to NFVI Provide interconnection between the access point and the transmission network , Connecting virtual networks to existing network components . The gateway can make packets span different networks by adding and removing packet headers .

• Storage nodes

The storage node is NFVI Through calculation in nodes 、 Storage and network functions provide a unit of storage resources . Storage can be physically realized in many ways , For example, it is implemented as a component in a computing node .

• Network nodes

The network node is NFVI Through calculation in nodes 、 Store and forward functions to provide network resources （ For example, switching and routing ） Unit of . One NFVI The computing domain within a node is usually deployed in the form of multiple interconnected physical devices . Physical computing nodes may include multi-core processors 、 Physical resources such as memory and network card , The set of these interconnecting nodes constitutes NFVI Nodes and NFVI Access point .