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Troubleshooting Guide

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

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A 10GE Optical Interface Cannot Go Up

A 10GE Optical Interface Cannot Go Up

Fault Description

A 10GE optical interface cannot go up physically. The interface status is as follows:

<HUAWEI> display interface 10ge 4/0/2
10GE4/0/2 current state :  (ifindex: 9)
Line protocol current state : 
Description:
Switch Port, PVID :    1, TPID : 8100(Hex), 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 :               10000,     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 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.
  • Negotiation between the local and remote end fails.
  • The optical module fails.

Troubleshooting Procedure

  1. Ensure that the rate (10 Gbit/s or 1 Gbit/s) and wavelength of the local and remote optical modules are the same. The remote optical module must transmit optical signals properly.

    Table 10-3 describes the rate matching between a 10GE optical interface and a 10GE or GE optical interface.
    Table 10-3 Rate matching between a 10GE optical interface and a 10GE or GE optical interface

    Before Connection

    After Connection

    Interface A

    Interface B

    Interface A

    Interface B

    10GE

    10GE

    Up

    Up

    GE

    GE

    Up

    Up

    10GE

    GE

    Down

    Down

    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
    
     10GE1/0/1 transceiver information:
    -------------------------------------------------------------------
     Common information:
       Transceiver Type                    :10GBASE_Passive_Copper_Cable
       Connector Type                        :-
                            :850
       Transfer Distance (m)                 :1(Copper)
       Digital Diagnostic Monitoring         :NO
       Vendor Name                           :TIME
       Vendor Part Number                    :D09181-4A
       Ordering Name                         :
    -------------------------------------------------------------------
     Manufacture information:
       Manu. Serial Number                   :D132810062
       Manufacturing Date                    :2013-10-08
       Vendor Name                           :TIME
    -------------------------------------------------------------------
     Alarm information:
    -------------------------------------------------------------------
                                                                                    
  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 requirements: Default RX Power Low Threshold < Current RX Power <Default RX Power High Threshold and Default TX Power Low Threshold < Current TX Power < Default TX Power High Threshold.
      -------------------------------------------------------------------
       Diagnostic information:
         Temperature (°C)                      :34.77
         Voltage (V)                           :3.29
         Bias Current (mA)                     :7.19
         Bias High Threshold (mA)              :10.50
         Bias Low Threshold (mA)               :2.50
         Current RX Power (dBM)                :-2.19
         Default RX Power High Threshold (dBM) :3.01
         Default RX Power Low Threshold (dBM)  :-15.02
         Current TX Power (dBM)                :-2.57
         Default TX Power High Threshold (dBM) :3.01
         Default TX Power Low Threshold (dBM)  :-9.00
      -------------------------------------------------------------------     
  4. If a GE optical module or GE copper module is used, ensure that the local and remote modules work in the same auto-negotiation mode and have the same rate. If a 10GE optical module is used, 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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