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This article mainly introduces "what does SDN refer to". In daily operation, I believe many people have doubts about what SDN refers to. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts of "what does SDN mean?" Next, please follow the editor to study!

What is SDN?

Physical separation of the forwarding layer from the network control layer and the control layer for controlling multiple devices

Software defined Network (SDN) is a new architecture with dynamic, manageability, cost-effectiveness and adaptability, which makes it an ideal choice for high bandwidth and dynamic performance of today's applications. The architecture decouples the network control and forwarding functions, making the network control directly programmable, and the underlying infrastructure will be abstracted for applications and network services. The OpenFlow ®protocol is the basic element for building SDN solutions. The SDN architecture is:

Directly programmable: network control is directly programmable because it is separate from the forwarding function.

Agility: abstract control from forwarding allows administrators to dynamically adjust network traffic to meet changing needs.

Centralized management: network intelligence is (logically) centralized in a software-based SDN controller that maintains a global view of the network and treats the application and policy engine as a single logical switch.

Programmatic configuration: SDN enables network administrators to configure, manage, protect and optimize network resources very quickly through dynamic, automated SDN programs that they can write on their own because programs do not rely on proprietary software.

Open standards and vendor neutrality: through open standards, SDN simplifies network design and operation because SDN controllers provide instructions rather than multiple vendor-specific devices and protocols.

Computing trends are driving network change

SDN addresses the fact that the static architecture of traditional networks is not suitable for the dynamic computing and storage needs of today's data center, campus, and service provider environments. Key computing trends driving the need for a new network paradigm include:

Changing the transport model: applications that typically access geographically distributed databases and servers through public and private clouds require extremely flexible traffic management and on-demand access bandwidth.

"consumerized information technology": the BYOD (Bring Your Own Device, bring your own device) trend requires networks that are both flexible and secure.

The rise of cloud services: users expect on-demand access to applications, infrastructure, and other IT resources.

Big data means more bandwidth: processing today's large data sets requires a lot of parallel processing, which will increase the constant demand for additional capacity and any connection to any.

To meet the network needs brought about by changing computing trends, network designers find themselves limited by the current network:

Too complex: adding or moving devices and enforcing network-wide policies are complex and time-consuming, mainly manually attempting risky service disruptions to prevent network changes.

Unable to scale: link oversubscription is ineffective for long-established methods of providing scalability for dynamic traffic patterns in virtualized networks, which is a more significant problem in service provider networks with massively parallel processing algorithms and related datasets throughout the computing pool.

Vendor dependence: the long product cycle of supplier equipment and the lack of standard open interfaces limit the ability of network operators to customize networks to their respective environments.

At this point, the study of "what does SDN mean" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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