This article discusses the differences in the “last reboot reason” display between EX switches during “request system power-off”.

Example:

• EX4300 shows the last reboot reason as “0x1:power cycle/failure”
• EX3400 shows the last reboot reason as “Router rebooted after a normal shutdown”

When manual power halt of the device is performed using CLI “request system power-off” with physical power drain of the device, a different “last reboot reason” is reported. If the command "request system power-off" is issued, and no power is drained, the switch will report a normal shutdown.

The following EX4300 was powered off and booted up, without power drain with the expected reboot reason of a normal shutdown:

root@jtac-ex4300-32f-r2033> show chassis routing-engine
Routing Engine status:
  Slot 0:
    Current state                  Master
    Model                          EX4300-32F
    Serial ID                      TW3719140112
    Start time                     2022-09-13 07:51:10 IST
    Last reboot reason             Router rebooted after a normal shutdown. —>
    Load averages:                 1 minute   5 minute  15 minute
                                       0.00       0.00       0.00

For this EX3400, the command "request system power-off" was issued, after the power off process was completed, the device was disconnected from power for one minute and powered on. The reboot reason is the following:
 

root@EX3400> show chassis routing-engine
Routing Engine status:
  Slot 0:
    Current state                  Master
    Model                          RE-EX3400-24P
    Serial ID                      BUILTIN
    Start time                     2022-07-19 14:31:00 PDT
    Last reboot reason             0x1:power cycle/failure
    Load averages:                 1 minute   5 minute  15 minute
                                      0.00       0.00       0.00

Note: This test was performed on QFX10002-60C, QFX10002-36q, QFX5120, and QFX5100, on all of them the “0x1:power cycle/failure” is reported if the device is disconnected from power after powering off the device. For the QFX5100 , if the device is powered off using "request system power-off", the device has to be power cycled (disconnect the PSUs from power and reconnect) to boot the device up again.

This is the expected behavior and does not impact any functionality.