North-south traffic
North-South Traffic or Communication denotes a direction of traffic flow into and out of a data center.
Based on the most commonly deployed topology of systems within a data center, North-South traffic typically indicates data flow that either enters or leaves the data center from/to a system physically residing outside the data center, such as user to server. Southbound traffic is data entering the data center ; data exiting via the perimeter network devices is said to be northbound. The other direction of traffic flow is East-west traffic which typically indicates data flow within a data center.
