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S12700 Series Agile Switches Hardware Installation and Maintenance Guide

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 Are Still Running)

Replacing the Only MPU on a Switch with a New One of the Same Model (Services Are Still Running)

Context

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.
  • 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, 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.

Tools

  • ESD wrist strap or ESD gloves

  • Phillips screwdriver

Procedure

  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. Install the new MPU into the slot for the standby MPU. For the installation procedure, see Installing a Card.
  4. View the RUN/ALM indicator on the new MPU.

    NOTE:

    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.

  5. Run the dir command to check whether the sizes of files (such as the configuration file) on the new MPU are the same as those on the old MPU.
    • If the file sizes are the same, the file synchronization is successful. Go to step 8.
    • If the file sizes on the two MPUs are different, go to step 7 to manually synchronize the files to the new MPU.
  6. (Optional) Save data.
    1. Log in to the switch.
    2. Copy the configuration file to the standby MPU using either of the following methods:

      • Method 1:

        Run the following command:

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

  7. Run the startup saved-configuration command to specify the configuration file for the standby MPU to use at the next startup.
  8. Run the slave switchover command to trigger an active/standby switchover.
  9. 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.
  10. 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 MPU.
  11. Remove cables from the old MPU.

    NOTE:
    • 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.

  12. Pull the old MPU out of the slot. For details, see Replacing a Service Card.
  13. Connect cables to the correct ports on the new MPU in accordance with the labels on the cables.

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.
    NOTE:
    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.

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Updated: 2019-05-15

Document ID: EDOC1000069460

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