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Posts Tagged ‘SDN’

CCNA 7.7.c: Northbound and southbound APIs

In SDN, Northbound and Southbound APIs are used to describe how interfaces operate between the planes.   Southbound interfaces define the way the SDN controller should interact with the forwarding plane to make adjustments to the network, so it can better adapt to changing requirements.  OpenFlow is a well-known southbound interface.  With OpenFlow, entries can […]


CCNA 7.7.b: Separation of control plane and data plane

In conventional networks, routers, switches, firewalls and other devices tightly couple the control  plane and the data plane on a single device.  SDN introduces the concept of separating the control plane and data plane.  The data plane remains on each device (physical and virtual) for quick, efficient forwarding of data.  The control plane provides layer-2 […]


CCNA 7.7.a: Function of a controller

In SDN, the control plane is on a single device – the controller. The controller is typically a virtual server loaded with open source SDN controller software.  The communications between the controller and the network devices typically uses a standardized protocol, i.e. OpenFlow.  The communications between the controller and the applications use any number of […]


CCNA 7.7: Describe network programmability in enterprise network architecture

Network programmability or Software Defined Networking (SDN), as the name implies, moves the brains of the network from individual hardware devices that use IOS to a centralized controller that uses open source code.  This provides a central point of management for all devices on the network, which leads to greater automation and more efficient orchestration […]


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