Software Defined Networking - The Next Big Thing

The computer industry has seen a lot of innovation. It all began with the upgrading of internet download and upload speeds to download huge amounts of data. Then came the possibility to store mammoth amounts of data remotely. Thus cloud computing was born. Finally the iPv6 transition came giving rise to a number of URL’s good enough for every individual on this earth. With the introduction of 6LoWPAN, this kind of connectivity has been made possible on a variety of wireless devices also. To deal with these problems and other such troubles a few corporate giants put their hands together to form what is called the Open Networking Foundation. The aim of this foundation is to create a virtualized Software Defined Networking (SDN) computer architecture reliable enough to tackle such kind of networking troubles among other problems.
Software Defined Networking

Software Defined Networking (SDN) is an emerging computer networking architecture that has recently emerged. Networked routers and switches are used to handle huge volumes of data. In such routers and switches SDN separates the control plane and the data plane.

How SDN Works

While using SDN the control plane is incorporated in the commodity network equipment while the data plane is incorporated in the commodity network equipment. While using SDN, one can expect super fast optimization of switches. SDN allows for the external sources to access innards of switches and routers packed with huge volumes of data. Because of the ability of SDN to achieve this and more, a majority of computer experts regard SDN as the next big thing in the industry.

Different Variants of SDN


The various SDN models have been discussed are

Floodless and flood-based

With the flood-based SDN model a huge amount of global information is achieved by using popular broadcasting and multicasting techniques. This makes the SDN model more symmetric. Identity learning and global awareness is achieved through flood-based SDN. The disadvantage of using this kind of model is scalability. With the addition of new locations, the load for every location goes up thus bringing down scalability. Depending on distributed hashing and distributed caching of the SDN tables, forwarding in this kind of model is successfully achieved.

Host-based and network-centric

The host-based model also goes by the name ‘assumption model’. An assumption related to the usage of Software Defined Network in the various data-centers is being made. It is because of this assumption that the HyperVisor performs the encapsulation process. This is done in support of the various local machines that are being used to facilitate elasticity.

The network-centric approach clearly distinguishes the end points and network edge. There is a relationship between Software Defined Networking edge, outside host endpoints and access of Top of Rack device. This kind of SDN variant is being counted as one of the best and the traditional methods of networking. One of the advantages of using this kind of SDN is that it does not depend on any end points to carry out routing activity.

Symmetric and asymmetric

The asymmetric model makes sure that global information is centralized to the maximum limit. The more centralized the information is, much easier does it gets to achieve global consolidation. This in turn results in the accessible distribution of SDN traffic. Even in the symmetric distributed model, great effort is made to enhance global information distribution.

These are the most commonly used SDN models.

SDN can be used in any application, enterprise or carrier. They can also be used in a private cloud. However, one of the key areas where SDN is used is carrier support.

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