Today I’ll continue with what we started in Part 1.

Tip 5: Avoid overwhelming your NetFlow collector and take advantage of Flexible NetFlow sampling. Ex: For billing, you could export only counters per subnet via Flexible NetFlow.

Tip 6: Use NetFlow Analysis tools that have exceptional Netflow information filtering capability.

Tip 7: Look at the Flexible NetFlow features list from Cisco to find out what IOS version you need for the specific feature you want to enable. Your network device might have Flexible NetFlow enabled, however, the IOS version might not have the feature you need.

Tip 8: NetFlow information can become useless if you don’t have a user friendly network  analysis software. Our NetFlow and sFlow analysis software gives you a wide variety of ways to view traffic. It reports on Top Applications, Conversations, Flows, Protocols, Domains, Countries, Subnets, etc., across several routers and switches.

Tip 9: Use Wireshark to verify whether your NetFlow collector is receiving flows.

Conclusion: This list could go on forever, but in my opinion, the greatest NetFlow tip is to use Analysis tools that evolve with the technology. Flow technology is evolving rapidly, Netflow analysis software will have to evolve at almost the same pace.  I hope you enjoyed this blog, please feel free to contact me if you have any question.


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Dale Locke is the Regional Manager for the southeast US at Plixer. He works with prospects to solve the unique needs of their network and visits existing customers to assist with training. He enjoys developing new partnerships and building long lasting relationships with his clients. Dale's favorite hobbies include fishing, hiking, soccer, and football.


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