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Replacing a Single CMM in a Satellite Chassis


Use this procedure to replace one of the 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.


  • 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 CMM is uncommissioned for this chassis.

  • Familiarize yourself with the CMM replacement procedures in the BTI7800 Series Hardware Overview and Installation Guide.

  1. Disconnect the inter-chassis Ethernet cable from the CMM being replaced.

    This does not affect traffic on the service modules.

  2. Unseat and remove the CMM from the satellite chassis.
  3. Insert the replacement CMM 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. Connect the inter-chassis Ethernet cable to the replacement CMM.
  7. Log in to the shared management IP address for the system and verify that the replacement CMM is running properly.
    1. Use the show system command to make sure the system recognizes the replacement CMM.

    2. Use the show system firmware command to make sure the replacement CMM is running the correct level of firmware. If you see a **FIRMWARE MISMATCH** for firmware in the replacement CMM, then the respective firmware needs updating. For information on how to do this, see Upgrading the CMM Firmware.