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New Member

Should I use netflow?

Hi

We have a requirement for tracking flows within our network and external traffic. We can get, say, utilization on a port by using MRTG. What we would realy like is layer 3/4 stuff (ip addresses and tcp/udp) ports. ONe thing that has caught my eye is netflow. MY understanding is that if I enable netflow and then export this to a collecter it will present me with what I need.

Will enabling netflow impact on switch router performance (we have 2 6500s with sup1as and msfc 1)?

What Would be a good collector? Ive looked at NTop which seems ok. Can ngenius do the same?

Are the Network Analysis MOdules a better bet. (pricey probably!)

Thanks

Norman

  • Other Network Infrastructure Subjects
2 REPLIES
Blue

Re: Should I use netflow?

Refer to: http://www.cisco.com/warp/public/732/Tech/nmp/netflow/index.shtml

You'll find all the necessary details on NetFlow including White Papers that you need to understand NetFlow.

Also refer to 'NetFlow Performance Analysis' White Paper at:

http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/ntfo_wp.htm which should answer your question related to performance impact. As for the NetFlow Collector/Analyzer application, you can download a Demo version of both from: http://www.cisco.com/kobayashi/sw-center/netmgmt/netflow/nf-planner.shtml

Alternately, you can also look at FlowScan which is a free ware application at: http://www.caida.org/tools/utilities/flowscan/

New Member

Re: Should I use netflow?

Hi

Thanks for the links.

Ive see the white paper about netflow performance analysis before. It only seems to deal with routers. I would like to enable NFDE on our 6500s running catOS, will it have a similar affect?

thanks

Norman

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