Nfv and SDN

1、NFV： Virtualization of network functions

What is? NFV,NFV and SDN What's the difference? ？ - Huawei (huawei.com)
NFV（Network Function Virtualization） By using x86 And virtualization technology , Realize software and hardware decoupling , Put the router 、 Switch 、 A firewall 、 Network functions such as load balancing are encapsulated into modular software and run on a single universal hardware , Thus reducing the cost of expensive proprietary equipment .

（ chart ） NFV With traditional ne ：

NFV Applicable to various network solutions , At present, the most widely used include SD-WAN、、 Network slice 、 Mobile edge computing, etc . because NFV Understand software functions and hardware devices , With the improvement of standardized Architecture ,NFV It brings a lot of advantages ：

• Flexible business deployment
  Run different on the server VNF, When network requirements change , Change and move as needed VNF that will do , Accelerate the delivery and application of network functions . When testing new network functions , There is no need to establish a special experimental environment , Just request a new virtual machine to handle the request , When the service is disabled, release the virtual machine , It provides a more convenient method for network function test .
• Lower operator costs
  Use NFV after , The network communication entity will become a virtualized network function , This enables multiple network functions to run simultaneously on a single hardware server , This reduces the number of physical devices , Realize resource integration , Reduced physical space 、 Cost of power consumption, etc . But due to switching from traditional equipment to NFV The investment in the initial stage is large , The return on investment ratio in the short term does not have enough advantages over the traditional physical network element .
• Higher resource utilization
  When network requirements change , There is no need to replace the hardware equipment , Avoid complex physical changes , Quickly update the basic network architecture through software reorganization , Avoid equipment redundancy and relocation requirements caused by business changes .
• Avoid supplier lock in
  Deploy different network functions on unified hardware , Avoid certain functions being locked by specific suppliers , Reduce the service cost caused by network equipment maintenance .

2、SDN Software Defined Network

SDN：Software-defined Networking

What is? SDN？SDN and NFV What's the difference? ？ - Huawei (huawei.com)

In order to solve the lag of traditional network development 、 High operation and maintenance costs , Service providers are beginning to explore new network architectures , I hope to be able to Control surface （ Operating system and various software ） Decouple from hardware , Implement the underlying operating system 、 Open source self research of basic software protocols and value-added service software , But in the implementation process, due to the software R & D cost 、 Equipment replacement and other reasons , Current SDN The scheme weakens the separation of control surfaces , Only with Network automation operation and maintenance Target .

3、NFV and SDN

SDN and NFV Their similarities are mainly reflected in the following aspects ：

• Both aim to realize network virtualization , Realize resource pooling of physical devices .
• Both improve the efficiency of network management and business arrangement .
• Both hope to use interface operation or programming language to make network arrangement .

（ chart ） NFV and SDN The difference ：