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Why would a SecureStack have "Last switch reset caused by power cycle" messaging when it was not power cycled?

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TitleWhy would a SecureStack have "Last switch reset caused by power cycle" messaging when it was not power cycled?
Symptoms
  • Unit reset
  • Diagnostic message from 'show support' states "Last switch reset caused by power cycle".
  • Other stack units report this unit as the subject of "Unit Leave" and "Unit Join" messaging.
  • There was no manual reset of the unit's power feed.
  • No other device on the same power circuit reset itself.
Environment
  • SecureStack
  • B5-Series
  • C5-Series
  • D2-Series
  • All Firmware Versions
Cause
Regardless of firmware version, the switches may display this message if there was an interruption of system power which triggered a reboot of the switch unit in question (common), or if the cause of the reboot was undefined to the message-generating subroutine (rare).
Resolution
  • Investigate any local Surge protectors or quality of UPS battery status / Logs
  • If unsure of power, power strip or UPS, then connect a clock-radio that has a battery backup removed, to the power strip going to the Switch and modify the clock so it reads a random time like 5pm and let it be, If you see the same message in the logs and you also see that the clock flashes 12:00, then you have a power issue. 
  • If the reset is not explainable due to power interruption, then consider taking a single such event under advisement
  • If further pursuit is warranted, then please Contact the GTAC for assistance.
Additional notes
See also: KB 5766 (http://bit.ly/1htKW86).

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