Due to the internal problem of the motherboard caused the master board to continuously report HARD_BAD alarm, after replacing the master board, the alarm was not lifted, and the problem was solved after replacing the subrack.

Products

OptiX OSN3500

Fault category

HARD_BAD

Description

The 18-slot master board on an OptiX OSN 3500 network element has been reporting HARD_BAD alarms for about 6 months. The 18-slot master board continues to report the alarm even after a master-standby reversal, replacement of the master board, and replacement of the AUX board.

Cause analysis

From the alarm parameters, PARA1, PARA2, and PARA3 are all 0xff. PARA4 is 0x01, which indicates that the master control software has found bad hardware, and PARA5 is 0x04, which indicates that the Ethernet port for inter-board communication is bad. At this point, you need to replace the AUX board or the main control board to solve the problem.

Operation steps

Replace the AUX board and find that the problem still exists, so rule out the AUX board failure causing the problem.

Implement the main backup reversal, replace the main control board, and find that the problem remains, so rule out the main control board failure caused by the problem.

Determine that there is no pin reversal in slot 17, 18, and 37 on the motherboard, and determine that there may be a problem within the motherboard of the network element.

After replacing the subrack, the alarm was lifted.

Reference

None.