SDN vs Traditional Networking
There are two approaches to manage and control a computer network: Software-Defined Networking (SDN) and Traditional Networking. These two approaches have numerous differences in architecture and implementation for efficient data flow and connectivity within a network. We will discuss these differences in this chapter.
What is Software-Defined Networking (SDN)?
Software-Defined Networking (SDN) is a modern networking approach. It uses software applications to control and manage the network.
SDN centralizes the control of the entire network using software-based controllers, instead of depending on hardware devices like routers and switches for decisions.
The control plane (decision-making) and data plane (traffic forwarding) are separated. You can program these. SDN is used to create a virtual network and control a physical one. It uses software.
What is a Traditional Network?
Traditional networks are used for dedicated hardware devices like switches, routers, and firewalls to control network traffic. Each of these devices operates independently and can have their own decisions about traffic flow. This technique is old and it is used in many organizations today.
Traditional networks use a static and hardware-based architecture. It has control and data planes that are integrated into each device. If you want to change in this network then you need manual intervention, which is time-consuming and tough.
Components of a Traditional Network
- Network Devices − There are various physical hardware devices like routers and switches. You can use devices to manage traffic within the network.
- Cabling − There are physical cables. These are used to connect devices to each other. These form the backbone of the network.
- Protocols − There are various standard networking protocols like TCP/IP and Ethernet for communication between devices.
Advantages of Traditional Networking
- Well-Established − It is a tried-and-tested method. Because these networks are used for years in many network administrators.
- Predictable Performance − Its network performance is consistent and predictable. Because it is based on specific configurations and hardware.
- Familiarity − It is easy to use because of minimal training is required.
Disadvantages of Traditional Networking
- Limited Scalability − These networks are harder to scale due to their reliance on physical hardware.
- Manual Configuration − If you need to change in this network, then you need to do this manually. But it can be time-consuming and can cause errors.
- Rigid Architecture − These networks are difficult to adapt because business needs change.
Difference between SDN and Traditional Network
Take a look at the following block diagram. It depicts in a broad way how a Software-Define Network is different from a Traditional Network −
These are various differences between SDN and traditional networks. Some of these differences are highlighted in the following table −
| Software-Defined Networking | Traditional Networking |
|---|---|
| It uses a virtualized approach to manage networks. | It depends on dedicated hardware devices to control network traffic. |
| It has centralized control using a software-based controller. | It has distributed control, with each device managing its own operations. |
| It is programmable. So it is highly flexible. | It is non-programmable. So it is less adaptable to changes. |
| It supports open interfaces for interoperability. | It depends on proprietary systems from single vendors. |
| Data and control planes are separated. | Data and control planes are combined in each device. |
| You can automate configuration. So it can save time. | It requires manual configuration. It takes more time. |
| It can prioritize specific network packets based on needs. | It handles all network traffic in the same way, without prioritization. |
| It is easier to program and reprogram as needs evolve. | It is tough to modify and reprogram the network once its in place. |
| It is cost-effective due to simplified hardware needs. | It has higher hardware costs because of specialized devices. |
| It has lower structural complexity to manage. | It has higher structural complexity. So it is tough to manage. |
| It is easier to troubleshoot and report issues due to centralized control. | Its troubleshooting is tough because of distributed control. |
| Its maintenance costs are lower than traditional networks. | Its maintenance costs have higher than SDN. |
Conclusion
Software-Defined Networking (SDN) and Traditional Networking. You can choose one of these depending on your needs. SDN is flexible, scalable, and automation. SDN is good for large, dynamic networks. In contrast, traditional networking is easier to use. You can have more predictable environments.
SDN gives you modern approach with many advantages. Some of these advantages are cost efficiency and centralized control. But SDN also has disadvantages like complexity and security risks. Traditional networks are reliable. But these are less suitable for rapid changing business environments because of their rigidity and manual nature. So you can use SDN instead of traditional network.