CHASSISD_VOLTAGE_SENSOR_INIT

The  CHASSISD_VOLTAGE_SENSOR_INIT message is reported in the system message file whenever the chassis control process (chassisd) cannot initialize a voltage sensor on a component.

The chassis control process (chassisd) cannot initialize a voltage sensor on a component.

When a component is powered up, chassisd attempts to initialize the voltage sensor on the component (field-replaceable unit or FRU). If the chassisd process cannot initialize the voltage sensor for the indicated component, it generates the CHASSISD_VOLTAGE_SENSOR_INIT message.

Below are some examples of the message. The component for which chassisd was unable to initialize the voltage sensor is also listed.

Possible causes for the messages include:

  • Component hardware failure.
  • Faulty seating of the component in the midplane.
  • Faulty Power Entry Module (PEM).
  • Incorrect version of the Junos OS for the hardware installed in the router.

Perform these steps to determine the cause and resolve the problem (if any):

1. Collect the show command output to help determine the cause of this message.

Capture the output to a file (in case you have to open a technical support case). To do this, configure each SSH client/terminal emulator to log your session.

2. Analyze the show command output:

  • If there are messages indicating a fault with a PEM, it is likely that the CHASSISD_VOLTAGE_SENSOR_INIT messages are due to the PEM. Open a case with your technical support representative to resolve the PEM issue.
  • If there are messages indicating a hardware failure of the FRU reporting the CHASSISD_VOLTAGE_SENSOR_INIT message, it is likely that the messages are due to a hardware failure in the FRU. Continue with Step 4.

3. Determine if an MPC is installed in the router:

  • If the router contains an MPC, make sure that the router is running a version of the Junos OS that supports the MPC (see Table 7 in the MX Series Line Card Guide).
  • If the router is running a version of the Junos OS that does not support the MPC, the CHASSISD_VOLTAGE_SENSOR_INIT messages are likely due to an incorrect version of the Junos OS. Upgrade the router to a version of the Junos OS that supports the installed MPC.

4. If all else fails, reseat the affected FRU (during a maintenance window).

  • If the error no longer occurs, the CHASSISD_VOLTAGE_SENSOR_INIT messages are due to a faulty connection.
  • If the messages continue, swap the FRU with a similar FRU in a different slot.
  • If the messages follow the FRU, the FRU has failed.
  • If the messages stay with the slot, the slot is faulty.
  • In either case, the messages are due to a hardware failure. Open a case with your technical support representative.

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Prasanna

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