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NAC: End Systems disappear periodically from NAC / Access Control Appliance

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TitleNAC: End Systems disappear periodically from NAC / Access Control Appliance
Symptoms
End Systems are periodically removed from NAC
End Systems are periodically removed from Control
Environment
  • Nac v6.x
  • NAC v7.x
  • Access Control Appiance 
  • Extreme Management Center
Cause
If an End System was not active for the amount (or greater) of days that is defined within the 'Age 'End-Systems older than' variable, the end system is removed from the NAC.

The default value is 90 days.   For example, if an end system is no active for >90 days, using this default setting and the default 'Remote Associated Registration Data' is checked, the End system is removed completely from the NAC.
.
 
Resolution
In the NAC Manager, open the Tools-->Options Menu and location the Age Systems older than variable.  The default is 90 days:

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In Extreme Management Center, this is found under Administration->Options->Access Control->Data Persistence->Daily Persistence.

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Additional notes

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