Organizations, Enterprises, as well as service providers, would be surrounded by several competing forces. The impact of increasing mobile usage, the enormous growth in multimedia content, the high demand for cloud computing would cause unpredictable traffic patterns. To find a problem coping with unreliable traffic patterns, massive data centers were insisted. These traffic patterns would cause very high demand for meticulous resources that they couldn’t meet with accessible network infrastructure.
So there would be two choices:
1. Scaling network infrastructure for meeting the peaks, which would be very much complex and expensive.
2. Or you would be able to build a network so that it could be reconfigured automatically to cope with those channels and peaks for meeting appropriate demands.
That’s where SDN came into existence.
What is SDN?
SDN or Software-defined networking is considered a unique approach or an umbrella term for cloud computing and networking, which would be simplifying the management of the network. It would be enabling a programmatically efficient configuration of the network to improve the performance of networks and monitor results.
SDN would be emphasized that the basic architecture of the traditional networks is considered to be much decentralized and complex. In contrast, the present network would require being more flexible architecture with a simple troubleshoot option.
SDN architecture layers would be consisting of 3 layers.
a) The application layer
b) The control layer
c) The infrastructure layer
1. The Application Layer
The application layer consists of the programs that programmatically and explicitly communicate their desired network behavior and network requirements to the SDN Controller.
2. The Control Layer
The SDN Controller is considered the mid-layer that would be connecting the application layer and the infrastructure layer. The northbound interface is believed to be the connection between the controller and applications, while the southbound interface is the connection between the controller and the infrastructure layer. This layer would be processing the application layer’s instructions and requirements via the southbound interface and preceding them to the networking components via the northbound interface. It would also be communicating back necessary information extracted from the networking devices to the application for it functions the best.
3. The Infrastructure Layer
This layer would consist of networking devices that would control the forwarding and data processing capabilities for the network. The devices are considered to be responsible for handling packets based on the rules offered by a controller. It is regarded as the physical layer responsible for collecting the network statuses like network topology, traffic statistics, network usage, etc., and sending them to the control layer.
SDN architecture has the following features:
• Directly Programmable
Network control could be programmable directly as it is considered to be decoupled from forwarding functions.
• Centrally Managed
In Software-based SDN controllers, network intelligence is centralized logically, maintaining an overall view of the network.
Abstracting control from forwarding lets admin allows the users to manage network-wide traffic flow dynamically to meet changing needs.
• Programmatically Configured
In SDN, network managers are responsible for managing, configuring, securing, and optimizing the network’s resources quickly and easily.
SDN Implementation instructions are offered by SDN controllers instead of vendors as well as protocols. So it is considered to be Vendor neutral.
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