Where is the interface between the control plane and data plane within the software-defined architecture?

The control layer (control plane) is responsible for making forwarding decisions and provisioning policies across the network, while the infrastructure layer (data plane) is responsible for the actual forwarding of packets. The interface between these two layers, often referred to as the southbound interface, enables the control layer to program the forwarding tables and rules on devices in the infrastructure layer.

The application layer interacts with the control layer to communicate network requirements, but it does not directly interface with the infrastructure layer for traffic forwarding.

The management layer is concerned with configuration, monitoring, and orchestration, distinct from the operational interface between the control and data planes.

The application layer conveys high-level policies to the control layer, but the direct operational interface for packet forwarding is between the control layer and the infrastructure/data plane.