Description of the problem

OSN3500 SDH transmission equipment new shipment version 5.21.18.50P01 and 5.21.19.31 version, the user requires a unified version, from 5.21.18.50P01 upgrade to 5.21.19.31, after the upgrade is completed, an OSN3500 device master and backup master control board are reported hard_bad alarms, the master and backup master control is frequently reversed, The main control board of the device is SSN1GSCC01 single board.

Alarm information

The following alarms are intercepted from some of the network elements:

17 HARD_BAD CR end 2011-06-04 09:53:26 2011-06-04 09:54:25 0xff 0xff 0xff 0xff 0x01 0x00

17 HARD_BAD CR end 2011-06-04 09:54:36 2011-06-04 09:55:45 0xff 0xff 0xff 0xff 0x01 0x00

18 HARD_BAD CR end 2011-06-04 10:28:50 2011-06-04 10:28:55 0xff 0xff 0xff 0xff 0x01 0x00

18 HARD_BAD CR end 2011-06-04 10:40:34 2011-06-04 10:40:38 0xff 0xff 0xff 0xff 0x01 0x00

18 HARD_BAD CR end 2011-06-04 10:52:00 2011-06-04 10:52:14 0xff 0xff 0xff 0xff 0x01 0x00

Processing

1, to verify the upgrade action, a total of 7 sites loaded are no problem, the software package problem ruled out; engineers operate in strict accordance with the guide, the upgrade process, no error message, the upgrade is smooth, and the upgrade process has nothing to do;

2, two single boards are reported hard_bad alarm, the possibility of simultaneous failure is unlikely, because the alarm is reported on the master and backup master control board frequently occurs after the inversion, so the single board alarm is unlikely to be a false alarm;

3, the site of the full amount of data collected back to the analysis, verification results are as follows (see annex for detailed analysis process):

SSN1GSCC01 master control in the V100R009C04SPC200 version (19.31) under the bottom dwReadV36 interface implementation error, read the value of 3.3V voltage, thus probabilistically reported hard_bad alarm.

4, the occurrence of this problem can be considered:

A, version downgrade to R8 mainstream version V100R008C02SPC200 or V100R008C02SPC300, or upgrade to R10 version.

B. Replace the board with a non-N1GSCC01 board, such as N1GSCC02, N4GSCC and other boards; the problem is solved by replacing the board with N4GSCC at the site.

Root cause

1, the host software upgrade process is problematic, not properly loaded software;

2, hardware failure of the main control board;

3, host software and the main control board with the problem;

4, alarm false alarm;

Recommendations and summary

If there is a need for upgrading, it is recommended to verify the released equipment version strategy, because version 5.21.18.50P01 is the mainstream maintenance version, the current network is running stable, and version 5.21.19.31 is for the data characteristics of the special needs of the bureau and the use of the version of the current network of the problem site is not actually necessary to upgrade;

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