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    Verify FEB Failure

    The FEB will either restart, keep crashing, or fail completely. If the FEB fails, you will loose the router interface connections.

    To verify FEB failure:

    1. Check the FEB Uptime
    2. Check the System Uptime
    3. Check the FEB Connection
    4. Perform a Swap Test on the FEB

    Check the FEB Uptime

    Purpose

    To check the FEB uptime. A short uptime can indicate an FEB failure.

    Action

    To check the FEB uptime, use the following command:

    user@host> show chassis feb

    Sample Output

    user@host> show chassis feb
    FEB status:
      Temperature                 24 degrees C / 75 degrees F
      CPU utilization              1 percent
      Interrupt utilization        0 percent
      Heap utilization            17 percent
      Buffer utilization          44 percent
      Total CPU DRAM              64 MB
      Internet Processor II          Version 1, Foundry IBM, Part number 9
      Start time:                    2002-07-12 17:30:43 PDT
      Uptime:                        0 days, 0 hours, 1 minutes, 0 seconds
    

    Meaning

    The command output displays how long the FEB has been operating. A short uptime can indicate an FEB failure. Look for error messages that were generated at least 5 minutes prior to the failure event by using the following command:

    user@host> show log messages

    Check the System Uptime

    Purpose

    To verify FEB failure by checking last boot time of the system.

    Action

    To check the system uptime, use the following command:

    user@host> show system uptime

    Sample Output

    user@host> show system uptime
    Current time:      2002-07-17 16:43:45 PDT
    System booted:     2002-07-12 17:29:12 PDT (4d 23:14 ago)
    Protocols started: 2002-07-12 17:29:56 PDT (4d 23:13 ago)
    Last configured:   2002-07-10 23:10:27 PDT (6d 17:33 ago) by regress
     4:43PM  up 4 days, 23:15, 2 users, load averages: 0.07, 0.02, 0.00
    

    Meaning

    The command output displays the time when the system was last booted, in days and hours. If the boot time is short, it can indicate a Routing Engine or an FEB failure. Look for error messages that were generated at least 5 minutes prior to the failure event by using the following command:

    user@host> show log messages

    Check the FEB Connection

    Purpose

    To verify FEB failure by checking the FEB connection.

    Action

    Make sure the FEB is properly seated in the midplane. Use a Phillips screwdriver to ensure that the screws at the top of the FEB are securely tightened.

    Perform a Swap Test on the FEB

    Purpose

    To verify FEB failure by performing a swap test on the FEB.

    Caution: Before performing a swap test, always check for bent pins in the midplane and check the FEB for stuck pins in the connector. Pins stuck in the component connector can damage other good slots during a swap test.

    Action

    You must power down the router to remove and replace the FEB.

    To perform a swap test on an FEB:

    1. Attach an electrostatic discharge (ESD) strap to your bare wrist, and connect the strap to one of the two ESD points on the chassis.
    2. Turn off power to the router. For information on powering down the router, see the M5 and M10 Internet Router Hardware Guide.
    3. Unscrew the five screws holding the rear chassis component cover in place, and remove the cover. Be sure to save the screws for when you reinstall the cover.
    4. Flip the ends of the two ejector levers towards the outside edges of the router.
    5. Grasp both sides of the FEB and slide it about three-quarters of the way out of the router.
    6. Move one hand underneath the FEB to support it and slide it completely out of the chassis.
    7. Remove the Routing Engine from the FEB.

      Unscrew the screws on the outside edges of the extractor clips to unseat the Routing Engine from the FEB. Press in on the red tabs on the extractor clips, then flip the ends of the extractor clips toward the outside edges of the router to release the Routing Engine. Grasp both sides of the Routing Engine and slide it evenly out of the FEB.

    8. Replace the Routing Engine in the FEB.

      Align the rear of the unit with the guides inside the chassis. Slide the Routing Engine all the way in until it contacts the connectors on the FEB. Flip the ends of the extractor clips toward the center of the router to seat the Routing Engine onto the FEB. Using a screwdriver, tighten the screws on the outside edges of the extractor clips. Slide the Routing Engine into the slot evenly.

    9. Use both hands to grasp the front of the replacement FEB that works and align the rear of the FEB with the guides on the chassis.
    10. To ensure proper seating of the ejector levers, move them to an outward position slightly less than perpendicular to the faceplate before seating the FEB in the slot.
    11. Slide the FEB all the way into the chassis until it contacts the midplane.
    12. Grasp the ejector levers and carefully push the FEB to seat it onto the midplane.
    13. Flip the ejector levers toward each other to lodge the FEB in place.
     
     

    Published: 2012-08-20