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Netflow showing greater than possible bps

I am evaluating different netflow applications for my company and I am seeing throughput that should not be possible.

My company primarily uses MOE service for linking our several sites and for internet delivery. We are seeing flows of upto 500% greater than the configured speed of the circuit, however the 30 second averages are within normal. Does anyone know if this is normal with MOE based connections because the traffic shaping needs to kick in and it is possible to get higher than normal throughput for a brief period of time, or is their possibly something wrong with my netflow?

Thanks

1 REPLY
New Member

Re: Netflow showing greater than possible bps

Please check for the below mentioned points to resolve this issue.

1. The interface speed is not set right and NetFlow Analyzer uses the default speed of 1 Mbps (which may not be the correct interface speed).

Most of the analyzers determine the interface speed if you set the appropriate SNMP Port and Community for the router on the Analyzer.

2. The active timeout has not been set to 1 minute on the routing / switching device. You can use the command 'ip flow-cache timeout active 1' to set the active timeout to 1 minute on your router.

3. Non dedicated burstable bandwidth, where the ISP allows you to use over the allocated bandwidth depending on the other customers sharing that link

4. Also, please check if there is any application name being listed as 'ESP_app'. The analyzer may double count your traffic.

Thanks

Raj

ME NetFlow Analyzer

www.netflowanalyzer.com

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