SDN (Software Defined Network) has been the biggest change to the field of data communications in the last ten years. Networks are still expanding their throughput and we are attempting to provide a greater availability of data networks that can be used for more than data. With the availability of the customer applications and the altered expectations of the users, we need to be connected everywhere. However something on the journey to being completely connected had been overlooked; The definition of data communication by communication protocol is no longer enough. The important thing is the way in which the network elements and the services that they provide quickly adapt and react to the dynamic changes in the mobility of users. Traditional management methods fail or are prohibitively expensive.

Most manufacturers who adhere to SDN, often claim to have been doing it for a long time, however, this is often not strictly true- customers need a more fundamental change. They need to become less dependent on specific products and need to separate physical devices and their functionality. The network functions are transferred to the control layer - the controller function of customer equipment is limited to the throughput and connectivity. Such devices come under the common term "White switch", using software known as OpenFlow which is installed on the switch. It is obvious that such SDN solutions uniquely eliminate dependence on hardware products and significantly accelerate the selection and deployment of new network elements.


Reducing operating costs of the data network is not everything SDN offers. The network is accessible through an open defined interface which sits above the control layer. An area, which up till now has been difficult to reach, owing to the fact that the network elements was managed by NMS from individual vendors, can now, thanks, to SDN, be managed by a single controller. SDN has opened the door to applications that were previously implausible or economically unjustifiable. At the same time there are new opportunities utilising applications using SDN..

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Distributed Network Functions D-NFV

In connection with SDN, there is talk about applications that open network architecture brings. There is a new application interface that provides access to new applications without regional restrictions, which virtualizes networking functions. It is here that the concept of NFV (Network Virtualization Functions) becomes known. This function is essentially independent of SDN, but NFV alone can maximize the openness of the SDN interface. We need to get applications -network features- to the customer proactively, according to immediate needs. Most of these virtualised functions stay within data centres and are swiftly and efficiently allocated to customers. However, there are features that we would like to virtualize, but they would need to be closer to the customers. We need the customers to have open platform, which would allow us to dynamically add network functionality as needed; we need distributed NFV.

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