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FDB entries deleted frequently when using netlogin with MAC authentication

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TitleFDB entries deleted frequently when using netlogin with MAC authentication
Symptoms
<Info:nl.ClientFdbDel>: Network Login user 0A003BCDEF0 cleared by FDB deletion, Mac 0A:00:3B:CD:EF:00 port 1:1 VLAN(s) "Default" 
<Info:nl.ClientAuthenticated>: Network Login MAC user 0A003BCDEF0 logged in MAC 0A:00:3B:CD:EF:00 port 1:1 VLAN(s) "Default", authentication Radius
Mac authenticated clients are repeatedly deleted and reauthenticated every 10-20 seconds.
Environment
EXOS 15.7.1 and earlier.
EXOS 15.6.2 and earlier
Summit X460-G2
Cause
According to CR xos0060998, MAC-based authenticated sessions over RADIUS are erroneously deleted by FDB
Resolution
Upgrade the EXOS version. The fix is available in -
EXOS 16.1.1 (Released)
EXOS 15.7.2 (Released)
EXOS 15.6.3 (Released)
Additional notes

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