Hello, everyone!
In this post, I would like to share with you the causes and how to troubleshoot an unreachable NE on an OSN 3500
Fault symptom
A single NE being unreachable. This topic describes the symptoms, impact, and possible causes of a single unreachable NE. In addition, this topic describes the required tools, precautions, and procedures for rectifying the fault.
Symptom
On the U2000, a single NE is unreachable and the other NEs of the same site are reachable.
Impact on System
The unreachable NE cannot be managed.
Possible Causes
Cause 1: The hardware is faulty.
Cause 2: The IP address or the ID of the NE is incorrectly set.
Cause 3: The fibers are faulty.
Cause 4: The DCC of the optical interface is disabled.
Cause 5: The NE software fails.
Tools, Equipment, and Materials
U2000 LCT
U2000
Procedure
Cause 1: The hardware is faulty. As a result, the NE is unreachable.
Check whether the external power supply device is working in its normal state.
If...Then...The external power supply device is faculty refer to Service Interruptions Caused by Power Supply Failures to rectify the fault of the external power supply device. Check whether the NE recovers. If the NE does not recover, proceed to the next step. The external power supply device is working in the normal state proceed to the next step.
Check whether the power board is working in its normal state.
If...Then...The power board is faulty see the Parts Replacement to replace the faulty board. Check whether the NE recovers. If the NE does not recover, proceed to the next step. The power board is working in the normal state proceed to the next step.
Log in to the NE through the U2000 LCT.
If...Then...You fail to log in to the NE through the U2000 LCTThe SCC board or CXL board of the NE is faulty. See the Parts Replacement to replace the faulty board. Check whether the NE recovers. If the NE does not recover, check whether the fault is due to other causes. You successfully log in to the NE through the U2000 LCTCheck whether the fault is due to other causes.
Cause 2: The IP address or the ID of the NE is incorrectly set. As a result, the NE is unreachable.
Log in to the NE through the U2000 LCT and restore the original IP address and ID of the NE according to the record.
Check whether the NE recovers. If the NE does not recover, check whether the fault is due to other causes.
Cause 3: The fibers are faulty. As a result, the NE is unreachable.
Use the OTDR meter to test the fiber. Analyze the line attenuation curve displayed by the meter to determine whether fiber cut occurs on the line. For how to use the meter, see the OTDR user guide.
If...Then...Fiber cut occurs on the line to replace the faulty fiber. Then, check whether the service is restored. If not, check whether the fault is due to other causes. Fiber cut does not occur on the line check whether the fault is due to other causes.
Cause 4: The DCC of the optical interface is disabled.
On the U2000, check whether the DCC of the optical interface is disabled or enabled.
If...Then...The DCC of the optical interface is disabled to enable the DCC of the optical interface. Then, check whether the NE recovers. If not, proceed to the next step. The DCC of the optical interface is enabled to check whether the fault is due to other causes.
Cause 5: The NE software fails. As a result, the NE is unreachable.
Browse alarms by using the U2000, and determine the board that reports the alarm.
Load the NE software to the board, and perform a warm reset on the board by using the U2000 tool. Then, check whether the alarm is cleared.
Check whether the NE recovers. If not, proceed to other causes.
That's all, I hope you like it.
Thank you!
