The message, ‘5000 milliseconds and system is still up after IRQ0’ is frequently seen on the ACX router. To avoid seeing this message, upgrade to Junos 12.3X54-D16 or later, or enable the Dying Gasp function.

ACX series router frequently shows the following log message:

*** Power Loss ***
**** 5000 milliseconds and system is still up after IRQ0 ***

Before Junos 12.3X54-D16 for ACX platforms, due to a hardware circuit problem, it is observed that Dying Gasp Interrupt is often seen either continuously or as false occurrences. Due to this issue, the dying gasp function is disabled in Junos 12.3X54-D16 and later.

This is only a logging message. It is harmless to the system.

Refer to PR1073191 - ACX: add CLI to disable dying gasp interrupt/USB reset

• To stop these messages from appearing on the ACX platform, upgrade to Junos 12.3X54-D16 or later.

• According to PR1073191 , CLI was added to control this functionality where it is required. Knobs were also introduced to enable the dying gasp feature in case it is needed, which is disabled by default in JUNOS 12.3X54-D16 and later releases.
  
  Use the following configuration commands to enable Dying Gasp functionality on an ACX platform.