Flexible NetFlow is an extension of NetFlow v9. It provides additional functionality that allows you to export more information using the same NetFlow v9 datagram. Some Cisco devices support only Traditional NetFlow (TNF), while others support Flexible NetFlow (FNF) or both TNF and FNF.
| Device | NetFlow (TNF/FNF) |
|---|---|
Cisco ISR G1 | TNF and FNF |
Cisco ISR G2 | TNF and FNF |
Cisco 7200/7300 | FNF |
Cisco ASR1000 | TNF and FNF |
Cisco ASR9000 | FNF |
Cisco 4500 and 4500X with Sup 7 | FNF |
Cisco 6500 with SUP2T | FNF |
Cisco 6500 with Sup 32 and Sup 720 | TNF |
Cisco 7600 | TNF |
Cisco C3KX-SM-10G | FNF |
Cisco 10000 | TNF |
Cisco XR12000 / 12000 Series Routers | FNF |
Cisco CRS-1 | FNF |
Cisco Nexus 7000 | FNF |
Cisco Nexus 1000V | FNF |
Here are some of Flexible NetFlow benefits:
- Flexibility and scalability of flow data beyond traditional NetFlow
- Customized traffic identification
- Ability to focus and monitor specific network behavior
- Ability to monitor a wider range of packet information, producing new information about network behavior
- Enhanced network anomaly and security detection
- Convergence of multiple accounting technologies into one accounting mechanism
Figure below shows difference in a set of commands in TNF and FNF:
