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    Replacing Both CMMs in a Satellite Chassis

    Use this procedure to replace both CMMs in a satellite chassis in a multichassis system. The CMMs in the satellite chassis act as Management Relay Modules (MRMs) that relay messages and commands between the active CMM in the hub chassis and the modules in the satellite chassis.

    Warning: Service modules are automatically warm reloaded as part of this procedure. Software-based features on the service module (such as PM collection, APSD, APR, FPSD) are disabled while a service module warm reloads.


    • You have a USB drive containing the USB image for the replacement CMM. All four CMMs in a multichassis system must run the same release of software. The software image in the USB drive must therefore be at the same release as the software running on the hub chassis. For information on creating a USB drive, see Creating a BTI7800 System Repair Drive.
    • The replacement CMMs are uncommissioned for this chassis.
    • Familiarize yourself with the CMM replacement procedures in the BTI7800 Series Hardware Overview and Installation Guide.
    1. Disconnect the two inter-chassis Ethernet cables from the CMMs being replaced.

      Depending on the software release, the service modules might undergo a warm reload. This does not affect traffic on the service modules. If the service modules undergo a warm reload, the modules do not boot back up until communication is reestablished with the CMM in the hub chassis at the end of this procedure.

    2. Unseat and remove both CMMs from the satellite chassis.
    3. Insert one of the replacement CMMs into CMM slot A but do not seat it yet.
    4. If the replacement CMM does not have the required software load, follow the procedure in Installing a Software Load on a CMM Using a System Repair Drive to install the required software load onto the replacement CMM.
    5. Follow the procedure in Uncommissioning a CMM to uncommission the CMM and set the database to factory defaults.
    6. Unseat the CMM.
    7. Insert the second replacement CMM into CMM slot B but do not seat it yet.
    8. Repeat step 4 to step 6 on the second CMM.

      At the completion of this step, both CMMs should be unseated. They should also contain the required software image and be in an uncommissioned state.

    9. Connect the two inter-chassis Ethernet cables to the replacement CMMs.
    10. Seat both CMMs.

      Once the replacement satellite CMMs are seated, the satellite CMMs receive instructions over the inter-chassis links and assume the role of MRMs. If the service modules were warm-reloaded earlier, they will now boot up.

    11. Log in to the shared management IP address for the system and verify that the replacement CMMs are running properly.
      1. Use the show system command to make sure the system recognizes the replacement CMMs.
      2. Use the show system firmware command to make sure the replacement CMMs are running the correct level of firmware. If you see a **FIRMWARE MISMATCH** for firmware in the replacement CMMs, then the respective firmware needs updating. For information on how to do this, see Upgrading the CMM Firmware.

    Modified: 2017-10-25