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Netflow Version

edavis1

Does NTA work better with version 9 versus version 5? Is there a Netflow config guide for Cisco Nexux 5548?

Eric

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cnorborg

Version 5 is somewhat limited in the fields it can export and the order it has to do them in, although it can definitely do those essential to basic netflow. Netflow v9 allows for templates and is closer to the "industry standard" called IPFIX. These templates allow for many more attributes such as vlan, MPLS tag, and many others are possible since its a flexible format. Some say this flexible format slows it down a bit, but I've also heard if you have a bare essentials v9 template you can get more flows per second out. It also allows for direction in the flow, so where v5 only allowed ingress packets, you can do egress on v9...

The Nexus switches make you define the format of the netflow packets your sending out via Flexible Netflow. If you follow the Nexus 7000 guidelines in this document I believe it will get you where you need to be.

http://www.solarwinds.com/documentation/NetFlow/docs/NetFlowDeviceConfiguration.pdf

edavis1

Craig,

Thanks for the reply.

edavis1

One more question. I mistakenly asked for config guide for nexus 5500. Do you have a guide for Cisco 3925 router for Netflow 9?