Description of the problem

Huawei SDH OSN3500 gateway network element is abnormally off the management, the service is normal, a moment of automatic normal monitoring, querying the network element side of the history of the alarm returns to empty, the user needs to analyze the reason. The host version is 5.21.18.50P01, and the master model is SSN4GSCC.

Alarm information

GNE_CONNECT_FAIL, NE_COMMU_BREAK

Processing

1. Since this network element is a gateway network element, we suggest the user to ping the corresponding IP, and the user feedbacks that monitoring has been resumed before the user has time to ping the test;

2, it is recommended that the user will be the main gateway of the network element modified to other gateway network element, and then connected to the device cable into the computer for long ping, to see whether there is a loss of packets or interruptions, the long practice test found that the DCN is not a problem;

3, the neighboring network elements have no abnormal alarms and normal business, to rule out the problem of network element power loss;

4, due to the query network element on the history of alarms returned to empty, so suspect the main control board reset, the collection of errlog reset records returned to the R & D analysis, found that there is a platform tVos1s task reset, the following chart in red;

5, consulting R & D learned that, for SSN4GSCC, host 18.55 previous version of the known platform problems: 8560 diab compiler array initialization - tVos1s abnormal reset;

6, the conditions for triggering a host reset are: no CPU veneer such as PIU, AUX, etc. Frequent reset caused by small probability events.

[Solution] Upgrade to V1R8C02SPC500 (5.21.18.55) version to solve the problem.

Root Cause

1. user DCN problem;

2. equipment power down;

3, Main control board reset;

4, the main control board failure.

Recommendations and summary

It is recommended to issue an early warning, otherwise it is difficult for frontline engineers to judge and locate faults, which affects the timely rate of troubleshooting.