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Problem Description
A 3500 network element in a stronghold has been reporting the HARD_BAD alarm on the 18-slot master control board for about 6 months. The alarm is still being reported in slot 18 even after the master and backup are swapped, the master control is replaced, and the AUX board is replaced.
Parameters: 0xff 0xff 0xff 0x01 0x04
Parameters: 0xff 0xff 0xff 0x01 0x04
Alarm MessageHARD_BAD
ProcessingReplace the AUX board, and find that the problem still exists.
2, replaced the motherboard, found that the problem remains.
3, so, suspect that the motherboard may have a problem.
Confirm the problem through the following operations:
Single-plug No. 17 single board, no alarm in slot 18;
Single-plug No. 18 single board, HARD_BAD alarm is reported in slot 18;
Single-plug No. 18 single board, HARD_BAD alarm is reported in slot 18;
Plug the original 18-slot single board into slot 17, and plug the original 17-slot single board into slot 18, HARD_BAD alarm is still reported in slot 18;Replaced the 18-slot single board, and found the problem persists. Reported;
Replaced the 18th and 37th boards, the 18th slot reported any HARD_BAD alarm;
The customer took photos of the 17th, 18th and 37th slots of the motherboard that may have problems, and according to the photo analysis, there is no backward pinning situation.
The final conclusion,
, is that there is a problem inside the motherboard of this network element.
The problem was solved after replacing the subrack.
2, replaced the motherboard, found that the problem remains.
3, so, suspect that the motherboard may have a problem.
Confirm the problem through the following operations:
Single-plug No. 17 single board, no alarm in slot 18;
Single-plug No. 18 single board, HARD_BAD alarm is reported in slot 18;
Single-plug No. 18 single board, HARD_BAD alarm is reported in slot 18;
Plug the original 18-slot single board into slot 17, and plug the original 17-slot single board into slot 18, HARD_BAD alarm is still reported in slot 18;Replaced the 18-slot single board, and found the problem persists. Reported;
Replaced the 18th and 37th boards, the 18th slot reported any HARD_BAD alarm;
The customer took photos of the 17th, 18th and 37th slots of the motherboard that may have problems, and according to the photo analysis, there is no backward pinning situation.
The final conclusion,
, is that there is a problem inside the motherboard of this network element.
The problem was solved after replacing the subrack.
Root CauseFrom the alarm parameters, PARA1, PARA2, PARA3 are 0xff, PARA4, PARA5 have values.
PARA4 is 0x01---- master control software found hardware bad, PARA5 is 0x04---- inter-board communication Ethernet port bad. That is, the network port connecting slot 18 to other single boards is bad.
At this point, you need to replace the AUX board or the master control board to solve the problem.
PARA4 is 0x01---- master control software found hardware bad, PARA5 is 0x04---- inter-board communication Ethernet port bad. That is, the network port connecting slot 18 to other single boards is bad.
At this point, you need to replace the AUX board or the master control board to solve the problem.
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