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SDN

Updated Jan 16, 2019 ·

Software Defined Networking (SDN)​

Software Defined Networking (SDN) is a modern approach to network management that centralizes control and enables programmable and automated network operations.

  • Simplifies network management by separating control and data planes.
  • Enhances network flexibility and efficiency through centralized control.
  • Allows dynamic adjustments to network configurations and policies.

SDN centralizes network control, enabling programmability and automation for improved network management and efficiency.

SDN Architecture​

SDN architectures generally have the following components:

  • Data Plane

    • Forwards data packets within the network based on control plane instructions.
    • Includes devices like switches and routers that handle packet switching or routing.

  • Control Plane

    • Centralized controller manages and configures network devices.
    • Makes forwarding decisions and communicates with devices using software-based protocols.

  • Application Plane

    • Defines network policies and configurations through interfaces with the control plane.
    • Supports applications for monitoring, security, and traffic optimization.

SDN Controller​

The SDN controller is the core component of an SDN architecture, responsible for overseeing the network's operation.

  • Acts as the centralized point for managing and configuring the network.
  • Communicates with network devices to enforce policies and manage traffic.
  • Utilizes APIs and protocols to provide network automation and programmability.

SDN Security Benefits​

SDN enhances network security by offering more precise control and rapid response capabilities.

  • Enables granular and segmented network configurations.
  • Improves isolation and control.
  • Facilitates faster response to security incidents.

However, SDN also introduces some security challenges:

  • Increases network complexity, potentially creating new vulnerabilities.
  • Requires strong access controls to prevent unauthorized access.