Software Defined Networking (SDN) is a way to virtualize a network to simplify configuration and maintenance, just like virtualizing servers and storage. The difference is that SDN as a network solution is not as sophisticated as server and storage virtualization.
Nonetheless, SDN is coming – the more IT executives and business leaders understand SDN, the better they can determine when and where to introduce SDN in the data center. Here are the ten questions they asked about SDN.
1: What can SDN do?
Just like the hypervisor in virtualization, SDN introduces a layer of software between physical network components and network administrators. This software layer allows network administrators to adjust network devices through software interfaces rather than having to manually configure hardware and physical access network devices.
2: What does it mean when people discuss SDN to separate hardware from software?
There are two platforms in the network device - the control plane that determines where the traffic is sent, and the data plane that relies on the information given by the control platform to forward traffic. These two platforms have been separated (or decoupled) from each other in SDN. The data platform (or data forwarding platform) remains in the network hardware - but the control platform (or controller) that makes the traffic delivery decisions is now executed by software. This separation makes network virtualization possible because you no longer need to execute all commands or control rules on the hardware.
3: Why do you want to do this?
The proprietary firmware on the switch in today's network determines where packets are forwarded. In SDN, network administrators can actually control network traffic. You can control network traffic through a centralized network controller that integrates the information and control of all network switches in the form of a network fabric. They can also change the data flow rules in operation if necessary.
Through the software interface provided by SDN, network administrators have complete control over network traffic. This allows organizations to reduce their reliance on more expensive switches that have proprietary firmware that performs these functions—and must be set up manually.
4: What benefits does SDN offer?
SDN is an open source product, so it is development, vendor-neutral software. Because SDN adheres to development standards, in theory SDN can operate any vendor's network hardware. From the perspective of the IT department, this allows components to be locked out of the vendor. This also gives IT departments tremendous flexibility, and open standards solutions like SDN simplify the task of connecting to different clouds, applications and network devices – and it also allows network administrators to use software to do many of the past manuals. operating.
5: What is the difference between SDN and OpenFlow?
OpenFlow is a protocol for configuring switches in a network using APIs (Application Programming Interface). SDN is software that provides a network administrator with a control interface that allows administrators to configure, manage, and interrupt the network without having to physically set up network switches and devices.
[Translator's Note: This is not the same as the translator's understanding. SDN is an idea, and OpenFlow is an implementation of the idea. 】
6: Will SDN provide end-to-end IT infrastructure visibility?
No, no. SDN can be centralized through a single controller for the overall network, but this is just one of the many elements that must be linked together in the end-to-end view of the application. The contribution of SDN is to interact with the overall IT infrastructure management software, which can track applications through servers, storage, and network elements.
7: Which technology vendor has provided SDN?
Most well-known manufacturers have initial investment in SDN. These include Cisco, IBM, Alcatel, Juniper Networks, Broadcom, Citrix, Dell, Google, HP, Intel, NEC, and Verizon. With so much investment in product development, SDN will play a role in the IT infrastructure.
8: Why does SDN take so long to be adopted?
When people first started talking about SDN, from some perspectives, SDN is somewhat cloud-like. It is difficult for enterprises to grasp SDN and how to reduce network costs while improving overall network operations. And manufacturers have not shown convincing use cases. As long as IT decision makers are still confused, they will not create a business case for SDN.
9: We can't stand it without SDN?
The promise of SDN lies in the ability to virtualize IT infrastructure. So far, the biggest part of the infrastructure that is not virtualized is the network. From an agile perspective, companies want to join the network to arbitrarily enter private and public clouds. This is where smart technology like SDN starts to succeed. Yes, all network connections and decompositions can be done manually as they are now. But in the future, an intense project timeline will allow IT departments to find more efficient ways to configure and break down the network.
10: Is SDN a mature technology?
Not yet. Although major technology vendors acknowledge that SDN is the future direction, there is no interoperability standard for all network products, despite the open tradition of SDN. Before these standard disputes were resolved, only early adopters (think Google) who could not afford business pressure without the technology of SDN would be widely implemented. This does not mean that SDN should not be on your IT roadmap. Network interoperability through software will enter the enterprise in one form or another. Today, SDN is the best way.
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