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Netflow Randomly Stopped Working

Posted on 2013-07-01
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Last Modified: 2013-07-26
I have a Cisco ASA 5515 and a 2921 ISR that I have configured to receive netflow data from.  Both devices have been working perfectly for several months.  All of a sudden, both devices stopped sending netflow packets at about the same time.  I performed an #clear ip flow stats on the 2921, and it appears to be working again.  I can find no such command for the ASA.  I rebuilt the configuration for netflow on the ASA with no success.  Does netflow fill up the cache after a while and stop sending flows?  Is there any way to configure some kind of circular logging for such data?  Is there any way to clear the cache on the ASA appliance?
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Question by:marrj
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by:surbabu140977
ID: 39297140
flow-export destination inside <IP> <port>
flow-export delay flow-create 30
flow-export template timeout-rate 1

Then policy-map/class map your choice with ACL.

Please remember ASA will support only version 9. (in your collector check for version mismatch)

Most of the times it will be collector issue. Every collector won't work great with ASA. You might need to contact your collector vendor. But try using solarwinds  Orion NTA 3.5 SP2 demo for testing, if it's collecting data then problem is in the software.

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surbabu140977 earned 500 total points
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Plixer also seem to support it. Test any one (solarwinds or plixer) to see if netflow data is actually coming or not. If not coming, asa is the issue, if coming- your collector is the issue.

http://www.plixer.com/blog/netflow/netflow-security-event-logging-with-the-cisco-asa/

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