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    Monitor the SCB Status

    If the SCB fails, no information about chassis components is available through the CLI.

    To monitor the SCB status:

    1. Display the SCB Environmental Status
    2. Display the SCB Detailed Status
    3. Check the SCB LED Status

    Display the SCB Environmental Status

    Purpose

    To confirm that the SCB is functioning properly by checking the SCB status and temperature.

    Action

    To display the SCB environment status, use the following command:

    user@host> show chassis environment

    Sample Output

    user@host> show chassis environment
    Class Item                   Status     Measurement
    Power Power Supply A         OK
          Power Supply B         Absent
    Temp  FPC 0                  OK         29 degrees C / 84 degrees F
          FPC 1                  OK         25 degrees C / 77 degrees F
          FPC 5                  OK         27 degrees C / 80 degrees F
          SCB                    OK         26 degrees C / 78 degrees F 
    [...Output truncated...]
    

    Meaning

    The command output displays the SCB status and temperature. The SCB status can be OK, Failed, or Absent.

    Display the SCB Detailed Status

    Purpose

    To display a detailed status of the SCB.

    Action

    To display more detailed SCB status information, use the following command:

    user@host> show chassis scb

    Sample Output

    user@host> show chassis scb
    SCB status:
      Temperature                 27 degrees C / 80 degrees F
      CPU utilization              2 percent
      Interrupt utilization        0 percent
      Heap utilization            16 percent
      Buffer utilization          44 percent
      Total CPU DRAM              64 Mbytes
      Internet Processor II          Version 1, Foundry IBM, Part number 9
      Start time:                    2001-12-07 08:59:04 PST
      Uptime:                        4 hours, 40 minutes, 28 seconds
    

    Meaning

    The command output displays the temperature of the air passing by the SCB, in degrees Centigrade and Fahrenheit. It displays the total percentage of CPU being used by the SCB processor and the percentage being used for interrupts, the percentage of heap space and buffer space being used by the SCB processor, the total DRAM available to the SCB processor, the time when the SCB started running, and how long the SCB has been running. The Internet Processor version and part number are also displayed.

    Check the SCB LED Status

    Purpose

    To check the SCB status from the LEDs on the SCB faceplate.

    Action

    To check the SCB status, look at the LEDs on the SCB faceplate (see Figure 1).

    Figure 1: SCB LEDs

    SCB LEDs

    Table 1 describes the SCB LED states.

    Table 1: SCB LEDs

    Color

    Label

    State

    Description

    Green

    ACTIVE

    Flashing
    (pulsed with out-time proportional to traffic)

    I/O interrupts are occurring.

    Green

    RUN

    Blinking
    (slow and steady)

    SCB processor is running. Normally, the blinking is faint and becomes bright only when the SCB is processing many exceptions.

    Amber

    STAT1

    Flashing

    Internal diagnostics are running.

    Amber

    STAT2

    Flashing

    Internal diagnostics are running.

    If all four SCB LEDs are on, but dimly lit, the SCB is probably not seated properly. Tighten the captive screws at the top and bottom of the SCB card carrier.

    If the green RUN LED on the SCB is not blinking, the SCB processor is not functioning normally. The SCB might not be connected properly to the backplane. Tighten the screws at the top and bottom of the SCB card carrier. If that does not work, reinstall the SCB.

    The SCB has a reset switch on its faceplate above the LEDs. You normally do not use the reset switch. Pushing the reset switch results in a cold restart of the Packet Forwarding Engine, which causes a service interruption for a minute or two. To trip the reset switch, you must access it through a hole in the faceplate with a paper clip or other small probe.

     
     

    Published: 2012-08-20