- East-West Traffic Flow
- North-South Traffic Flow
- Southbound Interface/API
- Northbound Interface/API
East-West – East-West refers to traffic flows that occur between devices within a datacenter. During convergence for example, routers exchange table information to ensure they have the same information about the internetwork in which they operate. Another example are switches, which can exchange spanning-tree information to prevent network loops.
Network virtualization itself has led to a modest increase in the amount of East-West traffic found in the datacenter. For example, the traffic generated by a network controller communicating with physical or virtual network devices; routers, switches, appliances, and so on.
East-West refers to traffic flows that occur between devices within a datacenter. During convergence for example, routers exchange table information to ensure they have the same information about the internetwork in which they operate. Another example are switches, which can exchange spanning-tree information to prevent network loops.
North | South – North- South refers to traffic flows into and out of the datacenter. Traffic entering the datacenter through perimeter network devices is said to be southbound. Traffic exiting via the perimeter network devices is said to be northbound.
North- South refers to traffic flows into and out of the datacenter. Traffic entering the datacenter through perimeter network devices is said to be southbound. Traffic exiting via the perimeter network devices is said to be northbound.
Northbound Interface/API – In SDN, a northbound interface allows a particular component on a network, such as a network controller, to communicate with a higher-level component. The Network Controllers Northbound Interface is implemented as a Representational State Transfer (REST) API, often referred to as the REST API, or just the Northbound API.
The Network Controller Northbound API provides you with the ability to gather network information from Network Controller and use it to monitor and configure the network. The Network Controller Northbound API can be used to configure, monitor, troubleshoot, and deploy new devices on the network by using Windows PowerShell, (programmatically using) the Representational State Transfer (REST) API, or a management application with a graphical user interface, such as System Center Virtual Machine Manager.
Southbound API – In SDN, the main function of the Southbound Interface is to enable communication between the SDN controller and the network nodes (both physical and virtual switches and routers) so that the router can discover network topology, define network flows and implement requests relayed to it via northbound APIs
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