High-Risk Operations
Before maintaining the devices, services, and cloud management platform, read the following high-risk operations to avoid similar operations. If similar operations need to be performed, apply for archiving and risk assessment.
Potentially Service-affecting Hardware Operations
Operation Category |
Operation Subcategory |
Risk |
|---|---|---|
Device and card operations |
Do not remove the active MPU online. |
When the standby MPU works properly, data synchronization between the active and standby MPUs requires a period of time. If the active MPU is removed online, the latest data on the active MPU cannot be completely backed up to the standby MPU even if the system performs an active/standby switchover. As a result, system statistics are incorrect or data is lost. When the standby MPU does not work normally, removing the active MPU will interrupt all services on related modules and block partial or all services in the system. |
Do not press the Reset button at will. |
After you press the Reset button on the panel of a device or MPU, the device or MPU will be forced to restart. This operation can be performed only by qualified maintenance personnel as needed. If you press the Reset button on the panel of the device or MPU by mistake, the device or MPU will be reset. |
|
Do not remove or reinstall cards without an ESD wrist strap. |
Static electricity generated by the human body is hazardous to electronic components on cards. If maintenance personnel remove or reinstall a card without wearing an ESD wrist strap, the card is prone to be damaged or runs unstably. |
|
Do not connect to the debugging console port on a device or card through the serial cable to debug the device or card. |
The debugging serial port of the device or card can be used only by integrators or Huawei engineers. If a common maintenance engineer uses the debugging serial port, the program may run abnormally or the device or card may be reset. |
|
Cable operation |
Do not remove and reinstall network cables inside the cabinet randomly. |
The network cables inside the cabinet are mainly used for communication between the host and maintenance terminals. Removing and reinstalling network cables randomly may result in login failures from the maintenance terminal. |
Power supply operation |
Do not operate power switches in power distribution frames (PDFs) randomly. |
Power supply operations can only be performed upon upgrade, capacity expansion, part replacement, or fatal faults. When performing power supply operations, maintenance personnel must follow related operation guidelines. Improper operations on the switches may hinder device running or cause service interruption. |
Potentially Service-affecting Command Operations
Category |
Command |
Function |
Risk |
|---|---|---|---|
Restart |
reboot |
Restart the system. |
This command can be used by professional engineers only in the case of device deployment or upgrade. If you mistakenly restart the device, services will be interrupted. |
reset slot |
Restart a card. |
After this command is executed, the specified card is restarted and related services are interrupted. |
|
Shutdown |
power off slot |
Power off a card. |
After this command is executed, the specified card is powered off and related services are interrupted. |
shutdown |
Shut down an interface. |
After this command is executed, the corresponding interface is unavailable, related links are terminated, and services are interrupted. |
|
Deletion |
format |
Format a storage device. |
After this command is executed, all the directories and files on the specified storage device is lost and irrecoverable. |
delete |
Delete a specified file from the storage device. |
After this command is executed with unreserved being specified, the specified file will be permanently deleted and cannot be restored. |
|
Reset |
reset |
Reset various protocols. |
Do not run the reset command to reset protocols. Otherwise, services will be interrupted. |
If you configure a service on the cloud management platform (UI), do not log in to devices or go to the web NMS and run commands to configure the same service. Otherwise, configuration conflicts may occur and offline configurations may fail to be delivered.
Risky Operations on iMaster NCE-Campus
Do not reinstall the operating system on the server where iMaster NCE-Campus is located.
Do not modify system parameters of the operating system where iMaster NCE-Campus is located.
Do not deploy other application components on the server where the iMaster NCE-Campus node resides.
During routine maintenance, do not change the physical networking, such as stacking and connection relationships. The change must be performed according to the device replacement process.
When restarting or powering off the cloud management platform server, ensure that the server does not process services. Otherwise, services that are being executed may fail to be processed and dirty data may be generated.
Before stopping the iMaster NCE-Campus cluster, ensure that no operation is performed on the northbound interface. After the cluster is stopped, the iMaster NCE-Campus service is interrupted until the cluster is recovered.
- Exercise caution when the following high-risk operations are performed on iMaster NCE-Campus:
- Submit a device certificate.
- Restart a device.
- Replace a device.
- Restore factory settings.
- Delete a device.
- Set the tenant model.
- Delete a tenant.
- Set the license management mode.
- Delete the SSID of an AP.