Be Ware of Software Watchdog Reset on the System Control Board of OptiX OSN Equipment

Summary:
The software watchdog on the system control board of OSN Products an NE is occasionally reset when ASON gold services are created, rerouted, optimized, and changed among protection levels.

[Problem Description]
Trigger conditions:
New gold services are created or the existing gold services are rerouted, optimized, or changed among protection levels.

Symptom:
NEs are unreachable and abnormally reset.
Identification method:
1. A version that has the problem is used at the site.
2. The preceding trigger conditions are met.
3. The preceding symptom occurs.
4. Run the :mon-get-errlog:bid; (bid indicates the slot ID of the active system control board) command. The in Soft Dog Reset information is found in the reset log, as shown as follows:
fatal task errorcode=110009, Line 0 in Soft Dog Reset # 2012-7-16 8:3:33
5. Query the debugbuf.Log. The records similar to followings are found, and the tIonNbsSch task uses more than 90% of CPU resources. From the following records, it can be seen that the tIonNbsSch task uses 98.80% of CPU resources, higher than that of any other tasks.

Note:
debugbuf.log: Run the :log-query:bid,”debugbuf.log”; command (bid indicates the slot ID of the active system control board).

[Root Cause]
During the route computation of gold services, two trails with the same cost but different numbers of hops exist. In this case, the code processing error occurs, resulting in the software watchdog reset on the NE.
[Impact and Risk]
Fiber cut occurs during the ASON NE reset and services are interrupted.

[Measures and Solutions]
Recovery measures:
None
Preventive measures:
Change ASON gold services to silver or diamond services.
Solution:
Upgrade the NE to the following versions or install corresponding hot patches.
NG SDH: V100R008C02SPC200+SPH203
NG SDH: V100R008C02SPC500+SPH505
NG SDH: V100R010C03SPC203 and later versions
OCS 9500: V100R006C03SPC200+SPH206 (If the JSCC board is used on the live network, replace it with the ESCC board.)
OCS 9500: V100R006C05SPC203 and later versions

[Rectification Scope and Time Requirements]
N/A
[Rectification Guide]
N/A
[Attachment]
N/A
[Inspector Applicable or Not]
N/A