Configuring Hardware Flow Sensors

Configuring hardware flow sensors is your simplest and best option in most cases. Many network hardware manufacturers, such as Cisco, include flow export in their products. Cisco routers have supported NetFlow since the 1990s. Some larger Cisco switches also support NetFlow, but for best results you must configure switches differently than routers. Juniper routers also support flow export, so I'll cover configuring them. A number of smaller router vendors also support flow export, but you'll need to check your vendor's documentation for configuration instructions.

The book's examples will assume that the flow collector is running on the host on UDP port 5678. Replace these with appropriate values for ...

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