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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
A 40GE Optical Interface Cannot Go Up

A 40GE Optical Interface Cannot Go Up

Fault Description

A 40GE optical interface cannot go up physically. The interface status is as follows:

<HUAWEI> display interface 40ge 3/0/2
40GE3/0/2 current state :  (ifindex: 9)
Line protocol current state : 
Description:
Switch Port, PVID :    1, The Maximum Frame Length is 9216
Internet protocol processing : disabled
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 0025-9e01-0204
Port Mode:     COMMON FIBER,     Port Split/Aggregate:         DISABLE
Speed :               40000,     Loopback:                        NONE
Duplex:                FULL,     Negotiation:                        -
Input Flow-control: DISABLE,     Output Flow-control:          DISABLE
Mdi:                      -,     Fec:                                -
Last physical up time   : -
Last physical down time : 2013-04-10 03:12:43
Current system time: 2013-04-13 10:42:27
......

Common Causes

  • The type, rate, and wavelength of the local and remote optical modules are different.
  • An incorrect type or length of optical fiber is used.
  • The optical module is incorrectly installed or the optical fiber fails.
  • The optical module fails.

Troubleshooting Procedure

  1. Ensure that the type, rate, and wavelength of the local and remote optical modules are the same. The remote optical module must transmit optical signals properly.

    Currently, two types of optical modules with different part numbers are delivered for 40GE optical interfaces. Optical modules of the first type provide LC interfaces, and those of the other type provide MPO interfaces. Only optical modules providing the same type of interfaces can be connected.

    Run the display interface transceiver verbose command in the user view, system view, or interface view to check detailed optical module information so as to check whether the wavelengths of the local and remote optical modules are the same.
    <HUAWEI> display interface transceiver verbose
    
     40GE1/0/27:1 transceiver information:
    -------------------------------------------------------------------
     Common information:
       Transceiver Type                      :40GBASE_SR
       Connector Type                        :MPO
                            :850
       Transfer Distance (m)                 :100(50um/125um OM3)
                                              150(50um/125um OM4)
       Digital Diagnostic Monitoring         :YES
       Vendor Name                           :FINISAR CORP
       Vendor Part Number                    :FTL410QE1C
       Ordering Name                         :
    -------------------------------------------------------------------
     Manufacture information:
       Manu. Serial Number                   :MLP003N
       Manufacturing Date                    :2011-12-18
       Vendor Name                           :FINISAR CORP
    -------------------------------------------------------------------
     Alarm information:
    -------------------------------------------------------------------
     Diagnostic information:
       Temperature (Celsius)                 :36.18
       Voltage (V)                           :3.34
       Bias Current (mA)                     :-
       Bias High Threshold (mA)              :-
       Bias Low Threshold (mA)               :-
       Current RX Power (dBm)                :-
       Default RX Power High Threshold (dBm) :-
       Default RX Power Low Threshold (dBm)  :-
       Current TX Power (dBm)                :-
       Default TX Power High Threshold (dBm) :-
       Default TX Power Low Threshold (dBm)  :-
    -------------------------------------------------------------------
  2. Ensure that the local and remote optical modules have the same optical fiber transmission mode (single-mode or multimode) and use optical fibers of proper length.

    Optical signals of different wavelengths can travel different distances. Transmission distances of optical modules are affected by attenuation and dispersion of optical signals during transmission. Generally, a distance of less than 2 km is considered a short transmission distance, a distance of 10 km to 20 km is considered a medium transmission distance, and a distance beyond 20 km is considered a long transmission distance. The optical modules used on CloudEngine (CE) series switches support up to 80 km of transmission distance.

    The commonly used wavelengths of optical modules are as follows:
    • 850 nm: multimode optical modules. They are often used for short-distance transmission.
    • 1310 nm: mostly single-mode optical modules and a few multimode optical modules. They are often used for medium- or long-distance transmission.

    • 1550 nm: single-mode optical modules. They are often used for long-distance transmission.

    • Generally, a single-mode optical fiber is yellow, and a multimode optical fiber is orange.
    • Generally, the handle of a multimode optical module is black and that of a single-mode optical module is blue. You can also view the label attached to an optical module to check whether it is a single-mode or multimode optical module. SM and MM indicate single-mode and multimode, respectively.
    When using optical modules and fibers, pay attention to the following points:
    • Multimode optical modules must be used with multimode optical fibers. Single-mode optical modules are generally used with single-mode optical fibers, and can also be used with multimode optical fibers. If a single-mode optical module is used with a single-mode optical fiber, the transmission distance is often longer than 10 km.

    • If the transmission distance is long, the optical module must use an optical attenuator to prevent excessively high optical power.

    • If the transmission distance is short, use optical fibers of proper length.

  3. Run the display interface [ interface-type interface-number ] transceiver verbose command to check whether the optical module information is correct.
    • If alarm messages are displayed, install the optical module correctly or replace the optical fiber. Then, run the restart command to restart the interface.
      -------------------------------------------------------------------
       Alarm information:
          LOS Alarm
      -------------------------------------------------------------------
      
    • If no alarm message is displayed, check whether the optical power of the optical module is within the allowed range. That is, the power of the optical module must meet the following requirement: Default RX Power Low Threshold < Current RX Power < Default RX Power High Threshold.
  4. Replace the optical module.
  5. Use an optical fiber to connect the receive and transmit ends of the same optical module to perform a loopback test and check whether the interface can go Up. If the interface goes Up, the optical fiber is faulty. Replace the optical fiber. If the interface cannot go Up, the interface may be faulty. Contact technical support personnel.
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Updated: 2020-01-07

Document ID: EDOC1000060766

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