Troubleshooting the Huawei ONU abnormal status

Huawei ONU abnormal status are common GPON problems.  When the Huawei ONU MA5626 is connected to the Huawei OLT MA5608T, some customers will encounter some problems. For example, how to check Huawei MA5626 status on Huawei MA5608T? How to check the cause of various service failures on the MA5626 according to the status? The following sections describe how to identify the causes of MA5626 abnormal status from the perspective of the entire GPON.

 

Failure to Recover GPON MA5626 Configurations

MA5626 connected to a GPON port of MA5608T can go online successfully, but the queried Config state of the MA5626 is displayed as failed by running the display ont info command on the MA5608T.

 

Context

The MA5626 configuration status indicates whether the configuration restoration is enabled and whether the configuration restoration is complete. Configuration recovery refers to a process in which, after MA5626 goes online, the MA5608T issues configurations to the MA5626 and then the MA5626 adjusts its operating parameters based on the issued configurations.

The MA5626 configuration status has the following states: initial, normal, configuring (config), and configuration failure (failed). When MA5626 goes online, the MA5626 is in the configuration restoration stage.

l The first status is initial. Soon the initial is complete and the MA5626 enters the config state.

l In the config state, the MA5626 capability and configuration data are restored. The duration of the config state is determined by the amount of the data configured on the MA5626.

l If the configuration restoration is successful, the MA5626 transitions from the config state to the normal state.

l If the configuration restoration fails, the MA5626 transits from the config state to the failed state. Then the service is probably not carried forward.

 

Location Method

Fault Scope	Judgment Criterion	Possible Cause
OLT	ONUs of the same type fail to recover their configurations.	The configurations issued by the OLT mismatch the actual ONU capabilities.
ONU	A single ONU fails to recover its configurations.	The ONU functions improperly or is faulty.     The ONU has been configured at local and the configurations conflict with configurations issued by the OLT.

NOTICE:

To facilitate fault report, save the results of the following steps.

 

Procedure

1. When Config state of the MA5626 is displayed as failed, check whether the MA5608T generates the following alarm. If such an alarm is generated, clear it and check whether the fault is rectified. If the fault persists, proceed to 2.

 

0x2e21a102 The GPON ONT configuration recovery fails

 

2. Check for the possible causes on the MA5608T and troubleshoot the faults accordingly. If the MA5626 fails to recover its configurations, go to 3.

Possible Cause	Judgment Criterion	Troubleshooting Method
The configurations issued by the OLT mismatch the actual ONU capabilities	Check configurations issued to the ONU by the OLT. It is found that some configurations are not supported by the ONU. For example, the number of GEM ports exceeds the number supported by the ONU.	Modify OLT configurations based on actual ONU capabilities.

 

3. Check for the possible causes on the MA5626 and troubleshoot the faults accordingly. If the MA5626 still fails to recover its configurations after that, go to 4.

Possible Cause	Judgment Criterion	Troubleshooting Method
The ONU has been configured at local and the configurations conflict with configurations issued by the OLT.	The management-related ONU configurations such as IP address and management mode are configured on the web page.	Delete the web page configurations and issue configurations to the ONU by the OLT.
The ONU functions improperly or is faulty.	Run the ont reset command to reset the ONU. It is found that the ONU fails to recover its configurations.	Replace the faulty ONU with a functional one.

 

4. Connect for technical support.

 

5. The fault is rectified.

 

Long Program Switching Time

Long program switching time is a fault that a very long time is required in switching the current program to a new one; however, the programs can be switched and the new program can be watched. When such a fault occurs in an FTTH network, locate and troubleshoot the fault by using the following location methods and troubleshooting procedure.

 

Location Method

When the fault occurs in an FTTH network, check whether the fast leave attribute is correctly configured on the MA5608T.

NOTICE: 

To facilitate fault report, save the results of the following steps.

 

Procedure

 

1. Run the display igmp user service-port command to query the fast leave attribute (quick leave) of the user who encounters the fault, and check whether the fast leave attribute is correctly configured. The fast leave attribute can be configured by referring to Table 1 according to user network’s configurations.

 

If the fast leave attribute is correctly configured, go to 3.

If the fast leave attribute is incorrectly configured, run the igmp user modify service-port quick leave command to modify the fast leave attribute of the user. Then, go to 2.

 

Table 1 Configuring the fast leave attribute of a multicast user

ONT IGMP Settings	Number of STBs	Reserved Bandwidth	Fast Leave Disabled	Immediate Fast Leave	MAC-Based Fast Leave
IGMP disabled	One	Insufficient		?	?
		Sufficient	?	?	?
	More than one	Insufficient			? (fewer than or equal to eight STBs)
		Sufficient	?		? (fewer than or equal to eight STBs)
IGMP snooping	One	Insufficient		?	?
		Sufficient	?	?	?
	More than one	Insufficient			? (fewer than or equal to eight STBs)
		Sufficient	?		? (fewer than or equal to eight STBs)
IGMP proxy	One	Insufficient		?	?
		Sufficient	?	?	?
	More than one	Insufficient		?	?(Not limited)
		Sufficient	?	?	?(Not limited)

 

2. NOTE:

In Table 1, ? indicates that the corresponding fast leave attribute can be selected.

For details about principles and data processing of the fast leave attribute, see Feature Guide > Multicast > Advanced Multicast Technologies > User-Side Interoperating Technologies.

 

3. Order the program again to check whether the time of switching a program is of a proper length.

If the time of switching a program is of a proper length, go to 4.

If the time of switching a program is still too long, go to 3.

 

4. Connect for technical support.

 

5. The fault is rectified.

 

In summary, according to the above method, you should know how to identify the causes of MA5626 abnormal status from the perspective of the entire GPON. When you encounter problems, you can quickly solve it yourself.