Difference between Control Plane and Data Plane

Last Updated : 26 Aug, 2024

Explaining the flow of data in networks has been made easier by the use of terms that include Control Plane and Data Plane. Both these components are significant for the general operation of the network devices like routers and switches but they are used for different purposes. This article is going to explicate the Control Plane and Data Plane to let you know how they work, and the benefits and downsides of having them.

What is a Control Plane?

In Routing control plane refers to the all functions and processes that determine which path to use to send the packet or frame. The control plane is responsible for populating the routing table, drawing network topology, forwarding table, and hence enabling the data plane functions. This means here the router makes its decision. In a single line, it can be said that it is responsible for How packets should be forwarded.

Advantages of the Control Plane

Centralized Management: It is specifically a Control Plane that provides centralized control of the network devices to ease the imparting and application of policies.
Dynamic Adaptability: It is dynamic in such a way that it is capable of reacting to network changes such as link failure by providing the best route.
Scalability: ACPs particularly in SDN allow the networks to reach levels of scalability that do not come with equal levels of complexity.

Disadvantages of the Control Plane

Complexity: The management of the Control Plane can be particularly challenging especially in large-scale, a distributed environment.
Potential Bottleneck: When it is not well designed, the control plane might be a source of congestion altering the speed of a network to react to changing conditions.
Security Vulnerabilities: Because the Control Plane is a centralized element of the network, it can be a weakness; a vulnerability that can encapsulate the rest of the net.

What is Data Plane?

In Routing data plane refers to all the functions and processes that forward packets/frames from one interface to another based on control plane logic. Routing table, forwarding table and the routing logic constitute the data plane function. Data plane packet goes through the router and incoming and outgoing of frames are done based on control plane logic. Means in single line it can be said that it is responsible for moving packets from source to destination. It is also called as Forwarding plane.

Advantages of the Data Plane

High-Speed Packet Processing: The Data Plane provides fast processing of all the packets that are being transmitted in the network and also has a low latency factor.
Efficiency: This type is intended to support high levels of usage and is often optimized with hardware to provide higher levels of flow.
Simplicity: Looking at the Data Plane, it is much easier than the Control Plane in the sense that it does not have to make decisions on where packets should go, but rather just forwards packets in accordance with the rules that have been set.

Disadvantages of the Data Plane

Limited Flexibility: In contrast to the Control Plane, the Data Plane has specific guidance and cannot be very flexible in its reaction to the changes in the network.
Resource Intensive: High-performance Data Planes can hence at time be resource demanding in terms of hardware and energy needed in sustaining the performance.
Dependent on Control Plane: In other words, the Data Plane basically works depending on the directives and settings of the Control Plane exclusively.