[Problem Description] Trigger condition: This problem occurs when: The higher order cross-connect board on the Huawei Optical transmission product OSN 9500 NE uses software of the problematic version. Perform service addition/deletion, SNCP switching, MSP switching, and ASON rerouting operations twice or several times within 5 minutes.
Symptoms:
Symptoms may vary depending on the specific operations that have been performed:
1. In case of service addition, services cannot be added.
2. In case of service deletion, services fail to be deleted, while the NMS and the NE software indicate that the services have been deleted.
3. In case of the other three operations (that is SNCP switching, MSP switching, and ASON rerouting), services are interrupted.Identification methods:
The problem described in the pre-warning is triggered when the following conditions are all met:
1. The device is OptiX OSN 9500 and the software versions have bugs.
2. The cross-connect matrix changes at least twice within 5 minutes, such as service configuration addition/deletion, SNCP switching, MSP switching, and ASON rerouting.
3. When the services are abnormal, there are abnormal records in the black box. There are records such as “130 2011-10-26 5:4:25 0x1 41 0x43484543 0x4B205843 L. 541475145” in BB0.log or “CHECK XC FAIL” in BB1.log.
[Root Cause]
The software of higher order cross-connect boards has defects. During the cross-connection matrix update, task preemption occurs occasionally. As a result, the newly deployed or deleted services are affected. Huawei cross-connect boards are available at Huawei network product distributor.
[Impact and Risks]
The updated services fail. Based on the R&D personnel analysis, there is a small probability that the problem occurs.
Measures and Solutions
Recovery measures:
Active/Standby protection switching for the cross-connect board
Workarounds:
None.
Solution:
Upgrade the OptiX OSN 9500 NEs involved to the following version.
V100R006C03SPH202 and versions later than V100R006C03
V100R006C05SPC200 and versions later than V100R006C05
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