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S-Series Stops Sending Netflow Records to PurviewIf Second Mirror Configured

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TitleS-Series Stops Sending Netflow Records to PurviewIf Second Mirror Configured
Symptoms
  • No netflow data reaching the Purview appliance
    show netflow statistics export
    
    Export Statistics:
    
    ------------------------------------
    
    Network Packets Sampled:    29561933
    
    Exported Packets:              56466
    
    Exported Records:            1582966
    
    Export Packets Failed:         17863
    
    Export Records Dropped:            0
  • Disabling one of the two Mirrored uplinks causes the switch to send netflow records 
  • Enable both uplinks  and the switch exports netflow  records for about thirty seconds  and stops
  • The mirrored traffic on both mirrored uplinks works
  • Statistics show no Netflow records being exported
  • Statistics show Netflow records not being exported
Environment
  • S-Series
  • Purview collector switch not inline with network
Cause
  • set policy profile 1 name Application1 pvid-status enable pvid 4095 mirror-destination 1
  • set policy profile 2 name Application2 pvid-status enable pvid 4095 mirror-destination 2
  • The pvid 4095 should be pvid 0 for out of band installs. The 0 makes it a drop policy which creates the flows in hardware for netflow to key off of.
Resolution
1. Change Policies to use VID 0 and not VID 4095
  • set policy profile 1 name Application1 pvid-status enable pvid 0 mirror-destination 1
  • set policy profile 2 name Application2 pvid-status enable pvid 0 mirror-destination 2
Additional notes

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