Understand that NetFlow is completely transparent to the users in the network, including
all end stations and applications, and you don’t need to run it on all your routers. Actually,
you shouldn’t because there’s definitely overhead when using NetFlow because it requires
memory for storing information in cache on the device. NetFlow enables near real-time
visualization and analysis of recorded and aggregated flow data. You can specify the router,
the aggregation scheme, and the time interval for when you want to view and then retrieve
the relevant data and sort it into bar charts, pie charts, and so on. The components used
with NetFlow include a router enabled with NetFlow and a NetFlow collector.