NetFlow is a Cisco network protocol designed to collect active network traffic. NetFlow provides information such as the source, destination, and traffic volume. IT administrators use NetFlow data for network monitoring and capacity planning. IT professionals use the NetFlow protocol as a network traffic analyzer to determine the point of origin, destination, volume, and network traffic paths.

NetFlow is one of the many log formats NXLog supports. The xm_netflow extension module can parse NetFlow logs and supports defining custom element types.

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NetFlow (xm_netflow)
Cisco ASA