Identify the Primary and Secondary Chassis

IMPORTANT:
  • Do not apply power to the chassis until you have read the instructions for identifying the primary chassis. Applying power to the chassis in the correct order is crucial to identifying the primary and secondary chassis.
  • Make sure that both communication modules are set appropriately.
  • As a best practice, do not load an application until the primary and secondary racks are synchronized.
  • Before you identify the primary chassis and qualify the system, install the latest firmware. See Update Firmware.
  • A secondary chassis stops functioning if it contains modules or firmware that are not compatible with redundancy systems.
To identify the initial primary and secondary chassis of a redundant chassis pair, complete these steps.
  1. Verify that power is removed from both chassis.
  2. Apply power to the chassis that you want to identify as the primary chassis and wait for the PRIM status message to appear on the front panel of the module.
  3. Verify that all module pairs are at compatible firmware revision levels.
  4. Apply power to the chassis that you want to identify as the secondary chassis.
  5. Verify primary and secondary chassis designations by viewing the redundancy module status message display.
    For information about status messages on the display, see 1756-RM3 Status Indicators.
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