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In V100R006C00 and later versions, the DHCP relay supports round robin. By default, round robin is disabled. To enable round robin, run the ip relay address cycle command in the system view.
S6720-30C-EI-24S-AC, S6720-54C-EI-48S

Question:
What is the function of interface MEth0/0/1 on Huawei S5700-24TP-SI-AC?
Answer:
It is connected to the mainboard of switch, used for upgrade software, can not used to connect to other switch or router.

Some messages are displayed for configuration changes, but not for errors. For example, when you run a command, the following message is displayed:

DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.25.191.3.1 configurations have been changed. The current change number is 1, the change loop count is 64, and the maximum number of records is 1.You can run the following commands to hide this message:

Disable the DSA module in the Console information channel from sending traps.
<HUAWEI> system-view
[HUAWEI] info-center source dsa channel console trap level warning state offDisable display of logs, traps, and debugging message output for user terminals.
<HUAWEI> undo terminal monitor NOTE:
This command is valid for only the current login.

S2318TP-EI-DC, S2309TP-PWR-EI

In the case of an OptiX OSN 6800 system configured with the ASON function, it takes about one minute to reroute a 40G service.
Product

OptiX OSN 6800. OSN8800
Fault Type

ASON
Symptom

None.
Cause Analysis

In the case of an OptiX OSN 6800 system configured with the ASON function, it takes a relatively long time to reroute a service. The standard time is within two minutes and is generally about one minute.
This is because the TDC of a 40G wavelength spends a relatively long time searching for dispersion. If the system performance is good, the dispersion search time of the TDC will be shorter and the service rerouting time will be shorter accordingly.
Procedure

None.
Result

The problem is resolved.
Reference Information

None.

Answer

The ONTs with a name ended with "" or "Q" support dual-band Wi-Fi, such as the HG8245A and HG8245H.
XG-PON gateway type ONTs support dual-band Wi-Fi, such as the HN8055Q and HN8245Q.

This section describes the relationship among the alarm indicators on the EFI boards in OptiX OSN 6800 subracks.
Product

OptiX OSN 6800
Fault Type

Other
Symptom

What is the relationship among the alarm indicators on the EFI boards in OptiX OSN 6800 subracks if the OptiX OSN 6800 NE adopts the master-slave subrack mode?
Cause Analysis

If the OptiX OSN 6800 NE adopts the master-slave subrack mode, the alarm indicators on the EFI boards in all the subracks are in the same state. That is, these alarm indicators indicate the alarm status of the entire NE rather than the alarm status of the individual subracks.
Procedure

Suppress all the alarms reported by the boards in the master subrack of an OptiX OSN 6800 NE (assume that the boards in both the master and slave subracks report alarms). Then, check whether the alarm indicators on the EFI boards in the master and slave subracks are in the same state.
Suppress all the alarms reported by the boards in the master and slave subracks. The alarm indicators on the EFI boards in all the subracks are off. Then, unsuppress the alarms reported by the boards in the master subrack. Check whether the alarm indicators on the EFI boards in all the subracks are in the same state.
Result

If the OptiX OSN 6800 NE adopts the master-slave subrack mode, the alarm indicators on the EFI boards in all the subracks are in the same state in case of an alarm reported by a board in either the master subrack or a slave subrack. That is, these alarm indicators indicate the alarm status of the entire NE.
Reference Information

None.

Common Causes of Lightning Strikes
Outdoor network cables or power cables are routed overhead.
A switch(such as S6700-24-EI, S6720-30C-EI-24S-AC) is deployed outdoors but is not properly grounded.
Damages of Lightning Strikes
If power cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn the power supplies.
If network cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn interfaces of the switch.
When a switch undergoes lightning strikes, overvoltage is induced by lightning on network cables and transmitted to interior of the chassis. The surge protection measures, such as lightning rod and chassis grounding cannot prevent the damage. Therefore, surge protectors or surge protection circuits are recommended.

Surge Protector Use Precautions
Take the following precautions to protect a switch from lightning:

Ensure that the ground cable is connected to a ground bar or a ground point on the cabinet.
Avoid routing cables overhead in an outdoor environment. Bury cables underground or route them in steel tubes.
To protect network interfaces against lightning, use 8-line surge protectors (or Huawei certified 4-line surge protectors).
When installing a network interface surge protector, connect the IN end to terminals and the OUT end to network interfaces of the switch.
If a fixed switch is installed in a network box, as shown in Figure 1, follow these instructions:

Connect the ground cables of the switch and surge protectors to the ground bar in the network box.
The maximum length of a ground cable cannot exceed 40 cm, and a length of smaller than 15 cm is recommended.
If the network box is located outdoors and power cables are routed aerially over a long distance (more than 300 m) to the network box, it is recommended that you install a power supply surge protector in the network box. The decoupled power cable must be at least 3 m long.

The ID of the internal clock source is the same as the ID of the external clock source, which results in the free-fun of the NE clock. When the setting of the internal clock source ID is cancelled, the fault is rectified.
Product

OptiX OSN 3500
Fault Type

Time synchronization
S1_SYN_CHANGE
LTI
Symptom

The SL64 board is installed in both slot 8 and slot 11 of the OptiX OSN 3500. The OptiX OSN 3500 and the OptiX OSN 7500 are interconnected. The cross-connect board of each device reports the S1_SYN_CHANGE and LTI alarms.
The clock configuration of the OptiX OSN 3500 is as follows:
The clock source traced by the line board is obtained from another device, and the priority of the external clock source is higher than the priority of the internal clock source.
The reversion mode of the high-priority clock source is set to automatic reversion.
The clock quality is set to Automatic Extraction.
Protection Status is set to Star Extended SSM Protocol.
The clock ID of the line board is not set.
The ID of the internal clock source is set to 6.
All the clock sources are in the normal state.
The clock configuration of the Optix OSN 7500 is as follows:
The external clock source exists.
No clock ID for either the external clock source or the internal clock source is set.
The clock synchronization source is provided by the clock source of the line board with a higher priority.
Cause Analysis

The OptiX OSN 3500 and the OptiX OSN 7500 are located on the same network, and the clocks of the entire network are synchronized with the external clock source of the device outside the network. The ID of the external clock source is 6, which conflicts with the ID of the internal clock source of the Optix OSN 3500. In this case, when the OptiX OSN 3500 detects the signals of the external clock source, after checking the ID of the external source, the OptiX OSN 3500 regards the signals as the internal clock signals. Therefore, to prevent the clock tracing loop, the clock of the OptiX OSN 3500 enters the free-run mode.
Procedure

In the T2000 main topology, right-click the NE icon of the OptiX OSN 3500, and then choose NE Explorer.
Choose Configuration > Clock > Clock Subnet Configuration from the Function tree.
Click the Clock Subnet tab.
Set Internal Clock Source.
NOTE:
If the device does not have an external clock source, set Internal Clock Source to (None). If the ID of the internal clock source is required to be set, make sure that the ID is different from the clock IDs of other devices.
Click Apply. In the Operation Result dialog box, click Close.
Reference Information

None.

An incorrect VC-12 timeslot numbering scheme is used. Therefore, timeslot collision occurs when a VC-3 service is created. Hence, you need to perform the service configuration according to the selected VC-12 timeslot numbering scheme when creating a VC-12/VC-3 service.
Product

OptiX OSN 1500
Fault Type

Others
Symptom

Create VC-12 services 1 to 15 one after another in the STM-1 frame. Then, create a VC-3 service in the second VC-3 of the STM-1 frame. It is found that an alarm is generated to report the timeslot collision.
Cause Analysis

The sequential mode (ITU-T) is used as the VC-12 timeslot numbering scheme. Hence, the 15 VC-12 services occupy the second VC-3. Then, timeslot collision is reported when you create the VC-3 service in the second VC-3.
Procedure

Right-click the NE on the T2000 and select Service Configuration.
According to the service configuration and engineering planning, click Option and select ITU-T or Interleaved as the VC-12 timeslot numbering scheme.
Create the services according to the selected VC-12 timeslot numbering scheme.
Reference Information

When you create a VC-12/VC-3 service on the T2000, configure the service according to the selected VC-12 timeslot numbering scheme. The following VC-12 timeslot numbering schemes are available:
Sequential mode (ITU-T): The VC-12 timeslots that are numbered 1, 4, 7, 10, and so on belong to the first VC-3, the VC-12 timeslots that are numbered 2, 5, 8, 11, and so on belong to the second VC-3, and so on.
Interleaved mode: The VC-12 timeslots numbered 1 to 21 belong to the first VC-3, and the VC-12 timeslots numbered 22 to 43 belong to the second VC-3, and so on.

In the OptiX OSN 6800 project with 40 wavelengths, the TN11OAU101 (the gain ranges from 20 dB to 31 dB and the standard single-wavelength output optical power is +4 dBm) is used.
In initial phase of the project, the DCM module is not configured between the TDC optical interface and the RDC optical interface on the TN11OAU101. On the T2000, the nominal gain of the TN11OAU101 is set to 20 dB, and the input and output optical power of a single wavelength are set to -16 dBm and +4 dBm respectively.
In the later phase, the DCM module (type B) is configured between the TDC optical interface and the RDC optical interface on the TN11OAU101 to compensate for the 40-km dispersion. The insertion loss of the DCM module is 5 dB. After the DCM module is configured, it is required to determine whether the nominal gain of the TN11OAU101 need to be reset on the T2000 to ensure that the output optical power of a single wavelength remains at +4 dBm, or whether the TN11OAU101 is able to automatically adjust the gain to keep the output optical power of a single wavelength unchanged.

Definition
H.248 is a media gateway control protocol through which the media gateway controller (MGC) controls the media gateway (MG) so that interoperability is implemented between different media. ITU-T issued the first version of this protocol in June 2000.

Purpose
Compared with MGCP, H.248 has the following merits:
Supports more types of access technologies, and is more thorough and complete in standardization
Compensates for the deficiency of MGCP in descriptiveness, is applicable to larger networks and has better extensibility and flexibility
Carried on various protocols, such as UDP/SCTP (MGCP is carried on UD

We have huawei OSN3500,OSN7500

Adding an ONT offline: Before installing an ONT, manually add an ONT to the OLT and configure the ONT. After the ONT goes online, the OLT authenticates the ONT and issues configurations to the ONT.
Adding an ONT online: After an ONT is installed, the OLT discovers the online ONT and adds and configures it.
The automatic discovery of an ONT applies when an ONT is added online. In this scenario, the installation time of an ONT is uncertain because the OLT periodically searches for online ONTs.
The automatic discovery of an ONT connecting to 10G GPON ports is disabled by default.
In 10G GPON interface mode, run the port ont-auto-find command to enable the automatic discovery of an ONT.
In 10G GPON interface mode, run the display ont autofind command to query the automatic discovery of an ONT.

The possible causes are as follows:

The network is disconnected. Check whether the PC is disconnected from the switch.
The HTTP server of the switch is disabled.