After a device fault occurs, you must collect detailed fault information immediately no matter whether you locate faults by yourself or ask help from a Huawei agent or technical support personnel. This helps you locate the fault accurately.

Collect the following information before troubleshooting a fault:

• Fault occurrence time, network topology (for example, location of the faulty device on the network and upstream and downstream devices connected to the faulty device), operations triggering the fault, and measures that you have taken and results. Symptoms and impacts of the fault, such as on which ports services are affected, should also be included.
• Name, version, current configurations, and interfaces of the faulty device. For methods of obtaining this information, see 3.2 Collecting Diagnostic Information and 9.1.3 Common display Commands.
• Logs generated when the fault occurs. For the method of obtaining the log information, see 3.3 Obtaining Logs and Alarms.

The display diagnostic-information command provides outputs of multiple commonly used displaycommands. You can use this command to view diagnostic information about the device, including the startup configuration, current configuration, interface information, time, and system version.

The display diagnostic-information [ file-name ] command displays diagnostic information on screen or saves the information to a text file (.txt). Diagnostic information includes startup configuration, current configuration, interface information, time, and system version. If you do not specify the file-nameparameter, diagnostic information will be displayed on screen. If you specify the file-name parameter, diagnostic information will be saved in the .txt file named by file-name. It is recommended that you save diagnostic information in a .txt file, as follows:

<HUAWEI> display diagnostic-information dia-info.txt
  This operation will take several minutes, please wait.........................
................................................................................
...                                                                             
Info: The diagnostic information was saved to the device successfully.

The default path of the text file is flash:/. You can run the dir command in the user view to check whether the text file has been created.

When a fault occurs on the device, provide the diagnostic information to a Huawei agent or Huawei immediately for fast fault location. For the method of transferring the diagnostic information to your computer, see 4.3 Transferring Files Using FTP/TFTP.

When diagnostic information is being displayed on the screen, you can press Ctrl+C to stop the display any time.

This command is used to collect diagnostic information for fault location. Executing this command may affect system performance, such as causing high CPU usage. Therefore, do not run this command when the device is running normally or on multiple terminals connected to the device at the same time. Otherwise, the CPU usage of the device will increase sharply, causing system performance deterioration.

All the commonly used terminal configuration programs can save display information to a file. For example, if you are using HyperTerminal on a Windows operating system, choose Transfer > Capture Text, enter a file name, and then click Start. After that, run the display diagnostic-informationcommand. All the diagnostic information is displayed on the terminal screen and automatically saved in a file in the specified path.

If a device is faulty, collect logs and alarms on the device immediately. These logs and alarms help you determine the cause and location of the fault.

 NOTE:

If a fault occurs in a stack, for example, the stack splits or restarts unexpectedly, collect log files on all the member switches.

If users require device after-sales service, they must provide the equipment serial number to the manufacturer. This section describes how to obtain the equipment serial number.

Method 1: Obtaining the Equipment Serial Number by Using a Command

Run the display elabel slot slot-id command to view electronic label information. slot-id specifies the slot ID of the device. BarCode specifies the equipment serial number.

<HUAWEI> display elabel slot 0
/$[System Integration Version]  
/$SystemIntegrationVersion=3.0   
      
      
[Slot_0]      
/$[Board Integration Version]  
/$BoardIntegrationVersion=3.0  
    
    
[Main_Board]     
      
/$[ArchivesInfo Version]      
/$ArchivesInfoVersion=3.0       
                 
           
[Board Properties]   
BoardType=CX22EFGEA      
BarCode=2102351820109C000451 
Item=02351820 
......

 NOTE:

You can run the display device manufacture-info command to check the serial number obtained from the electronic label.Only V200R003 and later versions support this command.

Method 2: Obtaining the Equipment Serial Number Through the Web System

When the web system is enabled on a device, you can view the equipment serial number through the web system.

EasyOperation web system (supported only in V200R005 and later versions)

Log in to a device through the web system and click Monitor on the toolbar to view device information, including the equipment serial number, as shown in Figure 3-1.

Figure 3-1  System Description 

Web system classical version

Log in to a device through the web system and click Device Summary on the toolbar to view board information, including the equipment serial number, as shown in Figure 3-2.

Figure 3-2  Board information