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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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Replacing the Only MPU on a Switch with a New One of the Same Model (Services Have Been Interrupted)

Replacing the Only MPU on a Switch with a New One of the Same Model (Services Have Been Interrupted)


If the only MPU on a switch is faulty, the replacement procedure varies depending on whether the MPU has completely or partially failed:

  • If the MPU has completely failed, services on the switch are interrupted and the command line interface (CLI) cannot be used.
  • If the MPU has partially failed, services are still running and you can run commands on the CLI.
  • If the services on the old MPU are interrupted and operations cannot be performed on the CLI, perform the following operations after the replacement:

    • Check the software version of the new MPU. Ensure that the software version of the new MPU is the same as that of the old MPU or is the required version.

    • (Optional) If the configuration file cannot be exported from the old MPU or the exported configuration file is not the latest, reconfigure services on the new MPU.

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

  • 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. It is recommended that you use the Hardware Configuration Tool to calculate the total power consumption of the switch.
  • Main control units of different models cannot be used in the same chassis.


  • ESD wrist strap or ESD gloves

  • Phillips screwdriver


  1. Enter the BIOS menu on the MPU from the serial port and copy the configuration file and license file from the MPU to a computer.
    • If the configuration file and license file are successfully copied to the computer, perform steps 2 to 10.
    • If the configuration file and license file fail to be copied to the computer, perform steps 2 to 9.
  2. Wear an ESD wrist strap or a pair of ESD gloves. When wearing an ESD wrist strap, insert the other end to the ESD jack of a device and ensure that the device is reliably grounded.
  3. Take out the new MPU from the package, and make sure that no components on the new MPU are damaged or missing.
  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. Pull the old MPU out of the slot. For details, see Replacing a Service Card.
  7. Install the new MPU in the chassis. For the installation procedure, see Installing a Card.

    The system software version on the new MPU must be the same as that on the old MPU.

  8. 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.

  9. Connect cables to the correct ports on the new MPU in accordance with the labels on the cables.
  10. (Optional) Upload the configuration file and license to the new MPU and load them.

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.
    • Run the display license command to check license information on the new MPU. It should be the same as the license information 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: 2019-09-29

Document ID: EDOC1000069460

Views: 40581

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