GPON ONT Service Profile Configuration-----multicast mode(gpon profile)

Function

This command is used to set the multicast mode of the ONT in a GPON ONT service profile. In different multicast modes, the multicast program streams are processed in different ways and the multicast users are authenticated in different ways. If you require the ONT to maintain the multicast forwarding table, select the igmp-snooping mode. If you require the OLT to maintain the ONT multicast forwarding table, select the olt-control mode. If the ONT does not support the multicast mode or the OLT does not specify the ONT multicast mode, select the unconcern mode.

Format

multicast mode mode-value

Parameters

Parameter	Description	Value
mode-value	Indicates the multicast mode. The following three modes are supported: igmp-snooping: Indicates the uncontrollable multicast. In this mode, the user reports the report packet to the OLT and then can watch the multicast programs without receiving the multicast configurations from the OLT. The ONT obtains relevant information and maintains multicast forwarding entries of the ONT by listening to (snooping) the IGMP packets. In this case, the OLT authentication is not required, while the encryption system of the IPTV platform controls the multicast program rights and the third-party device (such as the set-top box) controls whether a user has the right to watch a program. olt-control: Indicates the dynamic controllable multicast. In this mode, the report packet sent from the user is authenticated on the OLT. After the report packet passes the authentication, the OLT issues the multicast configurations to the ONT. Then, the user can watch the multicast programs. The OLT fully controls the multicast program rights. Unconcern: Indicates that the multicast mode is not concerned. That is, the OLT does not specify the multicast mode of the ONT. In this mode, if the ONT supports configuring of the multicast mode, the multicast mode of the ONT uses the default setting or the latest setting configured on the OLT.	Enumerated type. Option: igmp-snooping, olt-control, and unconcern. Default value: unconcern.

Modes

GPON ONT service profile mode,

Huawei OptiX OSN6800, Huawei Optix OSN8800 T16

Level

Operator level

Usage Guidelines

• Run the config command to enter global config mode, and then run the ont-srvprofile gpon command to enter GPON ONT service profile mode.
• Different ONT multicast modes require different OMCI messages sent from the OLT. In olt-control mode, the Huawei proprietary OMCI message (the ONT is required to support this OMCI message) is sent from the OLT. In igmp-snooping mode, the standard OMCI message is sent from the OLT. In unconcern mode, no OMCI message is sent from the OLT.
• After running this command, you need to run the commit command. Then, the configuration performed through this command can take effect.
• You can run the display ont-srvprofile gpon command to query the multicast mode of the GPON ONT.

Example

To configure the multicast mode of ONT service profile 10 to olt-control to prevent the problem wherein after one multicast user with rights orders a program, all the users on the GPON port receive the program, do as follows:

huawei(config-gpon-srvprofile-10)#multicast mode                    
{ mode-value<E><igmp-snooping,olt-control,unconcern> }:olt-control                                   
                                                                                
  Command:
          multicast mode olt-control

huawei(config-gpon-srvprofile-10)#commit

System Response

• The system does not display any message after this command is executed successfully.
• For more information about the error message that the system displays against a command entered with incorrect syntax

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Services Cannot Be Provisioned and The LWX2 Boards Report The R_LOC Alarm Due to Incorrect Service Rates on LWX2 Board of OptiX OSN 1800

The services cannot be provisioned and the LWX2 boards report the R_LOC alarm due to incorrect service rates on LWX2 board of OptiX OSN 1800.

Product

OptiX OSN 1800, 

Huawei OptiX OSN6800, Huawei Optix OSN8800 T16

Fault Type

Service Interruption

Optical Transponder Unit

R_LOC

Symptom

The OptiX OSN 1800 is used to build a metropolitan WDM network in counties. Between two sites, the LWX2 boards are used to transmit STM-16 services. After the client-side interfaces on the LWX2 boards are interconnected with the SDH equipment, the R_LOC alarm is reported on the client side and the WDM side of the LWX2 boards, and the R_LOS alarm is reported on the SDH equipment. In addition, services are unavailable.

Figure 1 shows the network topology.

Figure 1 The Network Topology of R Network

Cause Analysis

The possible causes of the fault are as follows:

• The optical power is unnormal.
• The service rates of the LWX2 board are incorrectly set.

Procedure

1. Measure the input power and output power of the LWX2 boards by using the optical power meter. The measured values are normal.
2. Query the basic attributes of the optical interfaces on the LWX2 board on the T2000. It is found that the service rates are set to the default value 2667.0 Mbit/s (OTU1 level) for the client-side and WDM-side optical interfaces of the LWX2 board.
3. Change the service rates to 2488.3 Mbit/s (STM-16) for the client-side RX1/TX1 optical interface, but retain the service rate of 2667.0 Mbit/s for the WDM-side optical interface, because the optical interfaces on the WDM side transmit services transparently. However, the fault persists.
4. Change the service rate to 2488.3 Mbit/s for the WDM-side IN1/OUT1 optical interface. Then, the fault is rectified and services are available.

Result

The problem is resolved.

Reference Information

Conclusions and suggestions for this case are as follows:

• Although the LWX2 board transmits services transparently, the service rates for the client-side and WDM-side optical interfaces need to be set separately on the T2000. That is, if the service rate on one side is changed, the service rate on the other side is not changed accordingly. Therefore, service rates need to be set to the rates of received services. (Note: After the NE software is upgraded to a version later than 5.67.01.22, the service rates on the client side are associated with those on the WDM side. That is, if you change the service rate for a client-side optical interface, the service rate for the corresponding WDM-side optical interface is changed to the same value automatically.)
• When functioning as a wavelength conversion board, the LWX2 board can receive services of a rate from 42 Mbit/s to 2.7 Gbit/s. The T2000 does not provide rate options, so the rates of received services need to be entered on the T2000. The following table lists the rates of common services.

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Intra-Board 1+1 Protection Switching Fails on the OptiX OSN 1800 After a Change of the NE ID

The intra-board 1+1 protection switching fails on the OptiX OSN 1800 after a change of the NE ID.

Product

OptiX OSN 1800, 

Huawei OptiX OSN6800, Huawei Optix OSN8800 T16, Huawei OptiX OSN8800 T32

Fault Type

Protection

Symptom

On a ring comprised of the OptiX OSN 1800, the LDGF boards of NE A and NE D are configured with intra-board 1+1 protection for the services transmitted between NE A and NE D. After a fiber cut occurs between NE A and NE D, no switching is performed on NE D. As a result, services are interrupted and NE D becomes unreachable to the T2000.

 Intra-board 1+1 protection involves: Active path: A (3-LDGF-1) - D (4-LDGF-1), Standby path: A (3-LDGF-2) - B - C - D (4-LDGF-2).

Cause Analysis

After a fiber cut occurs between NE A and NE D, no switching is performed on NE D. As a result, services are interrupted and NE D becomes unreachable to the T2000. The possible causes of the fault are as follows:

• The protection group is incorrectly configured.
• The protection group is abnormal.
• The software is abnormal.

Procedure

1. On the T2000, query the status of the protection group on NE D. The name of protection group is "NE-1 beyond management domain". It can be inferred that the NE ID is changed after the protection group is configured. Therefore, the protection group is abnormal and no switching can be performed.
2. Query the NE software version. The NE software version of NE D is 5.67.01.11. This version requires that all protection groups be deleted before the NE ID is changed.
3. Delete the protection group and configure it again. Then, NE D is always reachable to the T2000, services are restored, and the protection group is normal. In addition, the active path and standby path are normal, and the services are transmitted over the standby path.

Result

After the protection group is configured, the NE ID is changed, so the protection group is abnormal and no switching can be performed.

Reference Information

None.

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