SDN is an approach to networking that uses open protocols like OpenFlow and Stack to control software at the edge of the network. It is used to control access to switches and routers with cisco, juniper and other vendors. However, the basic purpose of SDN is to allow users to virtualize their hardware through centralized system i.e in control plane. The control plane can provide performance and fault management of NetFlow, IPFIX and SNMP protocols. This plane is generally used to manage configurations of devices connected to the SDN on a remote basis. The second part will be data plane which is responsible for forwarding traffic to its destination. The traffic is send via various flow protocols for better reliability to mange the network.
Software Defining Networking was created in response to demands from the large data centres,who found problems with very unpredictable traffic patterns. SDN is solutions for high demand on resources,Unpredictable traffic patterns, Rapid network reconfiguration, incorporating business rules. At the first time SDN was deployed in organisations like Google and Amazon for the better reliable and scalable data centres. As the big organisations are adapting the new SDN technology, other large companies also implementing this technology in order to be able to upscale more efficiently.
Software defining networking is ideally for customers who have rapid changes in their day to day network load such as social networking sites or maybe internet search engines. Really large data centres where have geographically dispersed resources and workloads in specific location,and they have to reconfigure their network to meet the demands for that specific resources. There has been a lot of type about software defining networking but the reality is that it’s really only suited for large data centers or customers who have this rapid configuration of their network. The problem with software definied networking is that it demands you change your entire network infrastructure to implement the SDN protocol and SDN controller. Other things like reconfigure the complete network, retrain stuff ,learn and add new management tools, new diagnostic tools. The solution for this problem is a tool that will allow you to centrally manage your network without reconfigure complete network and not any infrastructure changes.
How is SDN Different from Traditional Networking?
The major difference between a traditional network and SDN is that software- based network managed by a centralized system. In traditional networks we used physical devices like routers and switches to make connections and run properly. But in software-based network allow users to controls all resources at virtual level through control plane. As SDN has centralized based system to mange complete network and services it is easy for administrator to mange the network. SDN virtualizes your entire network. So that Virtualization creates your physical network which allows resources to be provisioned from your centralized location.
In traditional network, control plane mange your traffic like path forwarding, path decision, and also find shortest path. It is located within router and switches. The data plane is only act as forwarding plane where your data is flows through devices.
The reason why SDN is more important in future because it allows administrators to provision resources and bandwidth main factors of every network device instantaneously by changing MPLS. So investing more on physical infrastructure, it is great option to invest in SDN centralized system to mange your network very effectively.
The Advantages of SDN
- Centralised Provisioning System
One of the main advantage of SDN is the ability to manage a network from centralized perspective. SDN has capabilities to virtualizes both control plane and data plane of entire network to allow the users to provision physical devices and virtual elements from one centralized location. This is main advantage of SDN, as traditional network doesn’t manage entire network through one centralized location.
As SDN has major part that is Virtualization it is more difficult for administrator to secure their network against external threats and viruses. As SDN controller provides a centralized location to control the entire security of the network. But the cost is very high to manage entire SDN network as compared to traditional network.
- Scalability and Reliability
As the SDN has centralized system of entire network users has more scalability and reliability. SDN also has capabilities to manipulates the path forwarding to get better reliability, even if any of path is down than automatically other path is selected.
The Disadvantages of SDN
- More Complex Network Management
The entire network with one centralized location has difficult to manage to complex network management, due to things like network security, complex management of network through big scale etc. But there are many SDN solutions providers provides SDN security for the entire network. As such, it can be very difficult to maintain the integrity of an SDN service against external threats when you don’t have the requisite knowledge to defend the system.
One of the problem with virtualization any infrastructure is the latency that come in result. The speed of your interaction with an appliance is dependent on how many virtualized resources you have available. Your service is at the discretion of how your hypervisor divides up your usage of every devices memory, bandwidth and performance of devices.
Other disadvantages are
—- Single point of failure
—- New management tools needed for management
SDN: The Next Generation of Networking?
As the virtualization technology is growing very fast, we can except to see increase in the number of organisation deploying SDNs. Google and Amazon like big companies already deploy SDN in their data centre for better scalability and performance. Networks are more complex with cloud services and disparate infrastructure, systems like SDN will be used to help bring centralized control and scalability to large organizations. Traditional networks simply don’t have the foundation to keep up with the demands of modern enterprises. As the technology has very high development potential for transcending the network barriers presented by a legacy network. At this point in time SDN still has a long way to go. While it has promising foundations in place it needs to continually evolve if it is to achieve widespread adoption. The centralized advantages of SDN may be clear for the infrastructure to the curb.