An OSN 9800 NE reports
alarms frequently. These alarms are reported at the same time but cleared at different
times, as shown in the following figure.
Alarms on multiple
boards in subrack 1 are transiently reported at multiple time points
1. Check the NE where
alarmed are reported. The NE is formed by two OSN 9800 subracks in master-slave
mode. Run the alm-init command to
initialize these alarms. The fault persists.
2. Perform a switchover
on the system control boards in the master OSN 9800 subrack. The fault persists
after the switchover.
3. Analyze the alarms.
The alarms from the boards in subrack 1 are intermittently reported, but those
in the master subrack are normally reported. Check the black box logs of the
device. It is found that the dmm communication of all boards in subrack 1 is
unstable and the boards frequently go online and offline, as shown in the
4. It is suspected that
the EFI board in the slave subrack is faulty. As a result, the dmm
communication is unstable. After the 18EFI board in the slave subrack is
replaced, the fault is rectified.
The EFI board is faulty.
As a result, OSN 9800 alarms are intermittently reported.
If the EFI board is
faulty, communication between the master and slave subracks may be affected. As
a result, alarms are reported abnormally on the slave subrack.