NetFlow is a network protocol developed by Cisco for the collection and monitoring of network traffic flow data generated by NetFlow-enabled routers and switches.
NSEL NetFlow collectors gather telemetry from firewalls
As more firewalls support the NetFlow Security ...(SearchNetworking.com)
NetFlow v9 is powerful, so why isn’t anyone using it?
NetFlow v9 has been around for a few years and ...(SearchNetworking.com)
NetFlow is used by IT professionals to analyze network traffic flow and volume to determine where traffic is coming from, where it is going to, and how much traffic is being generated. NetFlow-enabled routers export traffic statistics as NetFlow records which are then collected by a NetFlow collector. The collector does that actual traffic analysis and presentation to the user and can take the form of a hardware appliance or software.
The term NetFlow has become a de-facto industry standard and is supported by platforms other than Cisco including; Juniper (Jflow); 3Com/HP, Dell and Netgear (sFlow); Huawei (NetStream); Alcatel-Lucent (Cflow); and Ericsson (Rflow).