Dear friend!
Possible Causes
Causes1: The communication between the gateway NE that the NE connects to and the NCE fails. Hence, the NE communication fails.
Cause 2: The SCC of the NE is faulty.
Cause 3: The fiber between the NE and the gateway NE that the NE connects to is broken.
Cause 4: The network scale is large so that the ECC communication between NEs exceeds the limit of the processing capability of the NE.
Cause 5: The NE is connected to a VRP-based PTN GNE. If the GNE connects to the NCE over the IP protocol but cannot connect to the NCE over the QX protocol, the NE will become unreachable to the NCE whereas the GNE remains reachable.
Procedure
Cause 1: The communication between the gateway NE that the NE connects to and the NCE fails. Hence, the NE communication fails.
Check whether the gateway NE reports the GNE_CONNECT_FAIL alarm. If yes, stop the alarm.
View the current alarms on the NCE to check whether the alarm stops. If the alarm persists, proceed to the next step.
Cause 2: The SCC of the NE is faulty.
Check the indicators on the panel of the SCC. If the indicators are abnormal, you can infer that the SCC is faulty. For details about the indicators, see Table 1. Reset the SCC. If the indicators are still abnormal, replace the SCC. For details about the operations, see Replacing the SCC board in the Parts Replacement of the equipment.
Cause 3: The fiber between the NE and the gateway NE that the NE connects to is broken.
Measure the fiber with an OTDR meter. Check whether the fiber is broken and the broken section of the fiber according to the fiber attenuation curve. Replace the fiber if the fiber is broken.
Cause 4: The network scale is large so that the ECC communication between NEs exceeds the limit of the processing capability of the NE.
1. Divide a subnet of a large scale into several subnets of small scales
2. Select proper common NEs as gateway NEs in a subnet.
3. Disable the ECC connections between redundant subnets.
Disable the interworking between ECC subnets, which is achieved through the extended ECC (automatic or manual).
Disable the interworking between ECC subnets, which is achieved through the STM-N electrical or optical interfaces.
Cause 5: The NE is connected to a VRP-based PTN GNE. If the GNE connects to the NCE over the IP protocol but cannot connect to the NCE over the QX protocol, the NE will become unreachable to the NCE whereas the GNE remains reachable.
The GNE can query non-gateway routes. If the GNE is using IP protocol, switch to the QX protocol.
For more information, please click the following link:
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100197069&id=EN-US_ALARMREF_0282315988&lang=en
Thank you!
