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S12700 and S12700E Series Agile Switches Hardware Installation and Component Replacement

This document describes hardware installation procedures of the S12700 series switches, troubleshooting methods for common hardware faults, and switch maintenance instructions.

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Replacing One of the MPUs on a Switch with a New One of the Same Model

Replacing One of the MPUs on a Switch with a New One of the Same Model


  • Check whether the MPU to be replaced is the active or standby MPU on the switch. If it is the active MPU, perform an active/standby switchover. If it is the standby MPU, replace it directly.

  • You can only replace a faulty or standby MPU on a switch. Do not replace the active MPU that is running normally (with the ACT indicator steady green).

  • Do not touch the electronic components on an MPU. Install or remove an MPU slowly and horizontally.

  • After the new MPU is installed and powered on, it automatically synchronizes the system software from the active MPU.

  • Format the replaced eUSB card or the eUSB card on an MPU that is scrapped or returned for repair.

  • Before replacing a card, verify that the available power is sufficient for the new card using the display power system command. If the available power (The remain power in the command output) is smaller than the power of the new card minus the power of the old card, use power modules with higher power to replace the original ones. Otherwise, the card will fail to be powered on. It is recommended that you use the Hardware Configuration Tool to calculate the total power consumption of the switch.
  • Before removing a running MPU from a S12710 chassis, hold down the OFL button on the MPU until the OFL indicator blinks red or turns steady red. When the OFL indicator turns steady red indicating that the MPU is isolated from the system, you can remove the MPU. When an MPU is running normally, its RUN/ALM indicator blinks green slowly and its OFL indicator is off.
  • Main control units of different models cannot be used in the same chassis.


  • ESD wrist strap or ESD gloves

  • Phillips screwdriver


  1. Wear an ESD wrist strap or a pair of ESD gloves. When wearing an ESD wrist strap, insert the other end in the ESD jack of a device and ensure that the device is reliably grounded.
  2. Take out the new MPU from the package, and make sure that no components on the new MPU are damaged or missing.
  3. (Optional) If the MPU to be replaced is the active MPU, run the slave switchover command to perform an active/standby switchover.

    Run the display switchover state command to check the active/standby switchover state. When the Switchover State field displays Ready, the switchover is complete. Go to the next step.

  4. Record the cable locations on the old MPU and check whether the labels on the cables are correct and legible. If any labels are illegible, make and attach new labels to the cables to ensure correct cable connection on the new card.
  5. Remove cables from the old MPU.

    • To remove a cable, release the handle or locking clips on the cable connector, gently push the cable connector by holding the handle or locking clips, and then unplug the cable.

    • If many cables are connected to a card, use the tweezers delivered with the switch to remove the cables.

  6. Remove the old MPU and install the new MPU into the slot. For details on how to remove the MPU, see Replacing a Service Card.
  7. View the RUN/ALM indicator on the new MPU.

    After the new MPU is installed in the chassis, it starts and registers automatically. The start and registration process takes less than 5 minutes.

    • If the RUN/ALM indicator blinks green fast, the MPU is starting.
    • If the RUN/ALM indicator blinks green slowly, the MPU is running normally.

  8. Connect cables to the correct ports on the new MPU in accordance with the labels on the cables.
  9. Run the dir command to check whether the names and sizes of files (such as the configuration file) on the new MPU are the same as those on the old MPU.
    • If the file names and sizes are the same, the file synchronization is successful. Go to step 12.
    • If the file names or sizes on the two MPUs are different, go to step 11 to manually synchronize the files to the new MPU.
  10. (Optional) Save data.
    1. Log in to the switch.
    2. Copy the configuration file to the new MPU using either of the following methods:

      • Method 1:

        Run the following command:

        <HUAWEI> copy flash:/XXX.cfg slave#flash:/XXX.cfg
        XXX.cfg is the configuration file name.
      • Method 2:

        Run the save command on the client to save the configuration file to the standby MPU.

    3. Copy the license file to the standby MPU.

      <HUAWEI> copy flash:/XXX.dat slave#flash:/XXX.dat
      XXX.dat is the license file name. Skip this step if there is no license file in the system.

  11. Run the startup saved-configuration command to specify the configuration file for the standby MPU to use at the next startup.

Follow-up Procedure

  1. The eUSB card on an MPU saves important data, such as configuration data and system logs. To ensure data security, format the following eUSB card:
    • eUSB card on a scrapped MPU
    • eUSB card on an MPU that will be returned for repair
    • Old eUSB card replaced by a new one
  2. Verify the functions of the new MPU.

    • Run the display device command to check the running status of the new MPU.
    • Run the display startup command to view the system software name and configuration file name for next startup. The file names on the new MPU must be the same as those on the old MPU.
    The network monitoring engineers or system maintenance engineers can configure the software using the CLI.

After replacing the MPU, collect all tools. If the replaced MPU is faulty, fill in the Repair Transmission Sheet and send the faulty module with the Repair Transmission Sheet to the equipment supplier or the specified repair service provider.

Updated: 2019-11-30

Document ID: EDOC1000069460

Views: 45504

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