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Troubleshooting the TX Matrix TX-SIBs and the Switching Planes

 

Problem:

Description:

The following alarms, LEDs, command output, and conditions indicate a problem with the TX-SIBs or switching planes:

  • The red FAIL LED below a TX-SIB on the craft interface is lit.

  • TX or RX LED next to a fiber-optic array adapter is lit red

  • The RX LED next to a fiber-optic array adapter is lit yellow.

Solution

To troubleshoot the switching plane connections between the TX-SIBs in the TX Matrix router and the T640-SIBs in the T640 routers:

  1. Verify that the TX-SIBs and T640-SIBs are online by issuing the show chassis sibs command:
    user@host> show chassis sibs
  2. Verify the state of the electrical and optical switch fabric links by issuing the show chassis fabric sibs command:
    user@host> show chassis fabric sibs

    Verify that the state of each link is Links ok.

  3. Display the system log messages to obtain information about link failures. The /var/log/messages file is a commonly configured destination for system log messages. To display it, issue the show log messages command:
    user@host> show log messages

    For more information about system log messages, see the System Log Explorer.

    Your customer support representative can assist you with using the information in the system log, along with the supplied fiber-optic array loopback connector and adapter, to determine if you have a faulty TX-SIB, T640-SIB, or fiber-optic array cable.

    Caution

    Do not connect and disconnect a fiber-optic array cable connector, a loopback connector, or a loopback adapter more frequently than required to perform the procedures in this hardware guide. These fiber-optic components are rated for a limited number of insertions (approximately 100).

  4. Check the status of the TX-SIBs using the CLI. Issue the show chassis environment sib scc command. The output is similar to the following:
    user@host> show chassis environment sib scc

    Use the CLI to check the status of the SIBs. For example, you can issue the following command to get information about the source of an alarm condition:

    user@host> show chassis alarms scc

    The text in the column labeled “Craft Interface Message” appears in the display of the craft interface. The text in the column labeled “CLI Message” appears in the output from the show chassis alarms command. For information about the alarms, see Table 1.

    Table 1: TX Matrix SIB Alarm Messages

    Alarm Type

    Craft Interface Message

    CLI Message

    Red

    SIB sib-number Failure

    SIB sib-number Fault

    SIB sib-number Removed

    SIB sib-number Absent

    Yellow

    Spare SIB Failure

    Spare SIB Fault

    Spare SIB Removed

    Spare SIB Absent

    Check SIB

    Check SIB

  5. If the red FAIL LED below a TX-SIB on the craft interface is on, look at the display on the craft interface to check the status of the TX-SIB.
  6. If an RX LED next to a fiber-optic array adapter is lit yellow, the fiber-optic array cable plugged into the adapter might be connected to the wrong T640-SIB. Check that the fiber-optic array cable is connected as specified in Fiber-Optic Array Cable Connections between TX-SIBs and T640-SIBs.
  7. If a TX or RX LED next to a fiber-optic array adapter is lit red, look at the display on the craft interface to check the status of the TX-SIB. If an RX LED is lit red, the corresponding receive link either has detected errors or is not functioning normally.
  8. Make sure the TX-SIB is properly seated in the midplane. Check that each ejector handle has been turned clockwise and is tight.