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Troubleshooting an Interface Down Event

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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).
Troubleshooting an Interface Down Event

Troubleshooting an Interface Down Event

Introduction

The common causes of interface Down events are as follows:
  • The interface is in Error-Down state.

  • The transmission medium is problematic.

  • The configuration is incorrect.

Troubleshooting an Interface Down Event

If an interface cannot go Up, perform the following steps to locate the fault (save operation results):

  1. Check whether the interface is in Error-Down state.

    <HUAWEI> display interface 10ge 1/0/1                                          
    10GE1/0/1 current state : ERROR DOWN(link-flap) (ifindex: 5)                        
    Line protocol current state : DOWN 
    ......

    If the interface is in Error-Down state, rectify the fault based on the following document:

    If the interface is not in Error-Down state, go to Step 2.

  2. Check optical module information.

    <HUAWEI> display interface 10ge 1/0/3 transceiver verbose 
     10GE1/0/3 transceiver information:                                            
    
    -------------------------------------------------------------------             
     Common information:                                                            
       Transceiver Type                    :10GBASE_SR                            
       Connector Type                        :LC                                    
       Wavelength (nm)                       :850                                   
       Transfer Distance (m)              :30(62.5um/125um OM1)                  
                                              80(50um/125um OM2)                    
                                              300(50um/125um OM3)                   
                                              400(50um/125um OM4)                   
    ...
    -------------------------------------------------------------------             
     Alarm information:                                                             
        LOS Alarm                                                                   
    -------------------------------------------------------------------             
     Diagnostic information:                                                        
       Temperature (Celsius)                 :34.68                                 
       Voltage (V)                           :3.36                                  
       Bias Current (mA)                     :7.03                                  
       Bias High Threshold (mA)              :10.00                                 
       Bias Low Threshold (mA)               :2.60                                  
       Current RX Power (dBm)                :-50.00                                
       Default RX Power High Threshold (dBm) :1.50                                  
       Default RX Power Low Threshold (dBm)  :-14.00                                
       Current TX Power (dBm)                :-2.22                                 
       Default TX Power High Threshold (dBm) :-1.00                                 
       Default TX Power Low Threshold (dBm)  :-8.00                                 
    -------------------------------------------------------------------

    Check the following items based on the preceding command output:
    • Based on the Transceiver Type field, check whether the local optical module type matches the remote optical module type. For example, if a GE optical module is installed on the remote interface and a 10GE optical module is installed on the local interface, the interfaces will not go Up. You can replace the optical module on the local or remote interface based on actual requirements so that the local and remote optical modules have the same rate.

    • Based on the Transfer Distance field, check the transmission distance of the optical module, and determine whether the optical fiber length is within the allowed transmission distance range of the optical module based on the optical fiber type. In the preceding command output, the transmission distance supported by OM1 optical fibers is 30 m. If the actual transmission distance exceeds 30 m, use an optical fiber with a longer transmission distance.

    • Based on the Current TX Power and Current RX Power fields under Diagnostic information, check whether the transmit and receive optical power of the interface is normal.

      If the value of Current RX Power is between the values of Default RX Power Low Threshold (dBm) and Default RX Power High Threshold (dBm), the receive optical power is normal. Otherwise, check whether the remote optical module is normal or connects to an optical fiber properly. Similarly, if the value of Current TX Power exceeds the allowed range, the transmit optical power is abnormal. Check whether the local optical module is normal or connects to an optical fiber properly.

    • Based on the Alarm information field, check whether the optical module is certified for Huawei Ethernet switches. If the alarm message "Non-Huawei-Certified Transceiver" or "Non-Huawei-Ethernet-Switch-Certified Transceiver" is displayed, the optical module is not certified for Huawei Ethernet switches. Replace it with an optical module certified for Huawei Ethernet switches.

    If the transmission medium is normal, go to Step 3.

  3. Check whether the configurations of the interfaces at both ends of the link are the same.

    <HUAWEI> system-view
    [~HUAWEI] interface 10ge 1/0/1
    [~HUAWEI-10GE1/0/1] display this
    #                                                                                                                                   
    interface 10GE1/0/1                                                                                                                   
     device transceiver 1000BASE-X                                                                                                      
     negotiation disable                                                                                                                
    #                                                                                                                                   
    Return
    [~HUAWEI-10GE1/0/1] display this interface
    10GE1/0/1 current state : DOWN (ifindex: 3109)                                  
    Line protocol current state : DOWN                                              
    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 0019-7459-3301 
    Port Mode:    COMMON COPPER,     Port Split/Aggregate:         DISABLE 
    Speed:                 AUTO,     Loopback:                        NONE          
    Duplex:                FULL,     Negotiation:                  DISABLE          
    Input Flow-control: DISABLE,     Output Flow-control:          DISABLE          
    ...
    • Based on the display this command output, check whether the configuration of the local interface is the same as that of the remote interface. For example, check whether the shutdown or training command is configured.

    • Check the Negotiation, Speed, and Duplex fields in the display this interface command output to determine whether the auto-negotiation modes, rates, and duplex modes of the interfaces at both ends match.

    If the preceding configurations are different, modify the interface configurations so that the auto-negotiation modes, rates, and duplex modes of the interfaces at both ends are the same. If the configurations of the interfaces at both ends are the same, go to Step 4.

  4. Collect information and contact Huawei technical support personnel.

    1. Results of the preceding steps

    2. Configuration files, logs, and alarms of the device

Related Information

For more information about interface faults and corresponding solutions, see the following document:

Interface Troubleshooting

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Updated: 2019-07-01

Document ID: EDOC1100086959

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