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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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Connected Network Interfaces Cannot Go Up

Connected Network Interfaces Cannot Go Up

This section provides a case that connected network interfaces cannot go Up.

Fault Symptom

After network interfaces are connected, the interface indicator is off, the physical or protocol layer cannot go Up, or the physical and protocol layers cannot go Up.

Possible Causes

  • The network cable is faulty.
  • The network configuration is incorrect.
  • The carrier line is faulty.
  • The connected RJ45 interface is a non-Ethernet interface.

Troubleshooting Procedure

  1. Use a running network cable to replace the existing one and connect interfaces again.
  2. Check whether the network interface configuration including the interface rate, duplex mode, and auto-negotiation on both devices are consistent.

    GE0 is used as an example. Run the following command on both ends of GE0 to check the network interface configuration on the AR:

    [Huawei-GigabitEthernet0/0/0]display this interface 
    If the network interface configuration is consistent, the fault is rectified. If the network interface configuration is inconsistent, perform the following steps.
    GigabitEthernet0/0/0 current state : DOWN               
    Line protocol current state : DOWN                      
    Description:HUAWEI, AR Series, GigabitEthernet0/0/0 Interface       
    Route Port,The Maximum Transmit Unit is 1500            
    Internet Address is                     
    IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 5489-9875-4a0b               
    Last physical up time   : -                             
    Last physical down time : 2011-09-28 09:51:56           
    Current system time: 2011-09-28 13:52:21                
    Port Mode: COMMON COPPER                                
    Speed : 1000,  Loopback: NONE                           
    Duplex: FULL,  Negotiation: ENABLE                      
    Mdi   : AUTO      
    Last 300 seconds input rate 0 bits/sec, 0 packets/sec   
    Last 300 seconds output rate 0 bits/sec, 0 packets/sec  
    Input peak rate 0 bits/sec,Record time: -               
    Output peak rate 0 bits/sec,Record time: -              
    Input:  0 packets, 0 bytes                              
      Unicast:                  0,  Multicast:                   0        
      Broadcast:                0,  Jumbo:                       0             
      Discard:                  0,  Total Error:                 0         
      CRC:                      0,  Giants:                      0       
      Jabbers:                  0,  Throttles:                   0           
      Runts:                    0,  Alignments:                  0               
      Symbols:                  0,  Ignoreds:                    0             
      Frames:                   0                           
    Output:  0 packets, 0 bytes                             
      Unicast:                  0,  Multicast:                   0           
      Broadcast:                0,  Jumbo:                       0           
      Discard:                  0,  Total Error:                 0      
      Collisions:               0,  ExcessiveCollisions:         0          
      Late Collisions:          0,  Deferreds:                   0         
      Buffers Purged:           0                           
        Input bandwidth utilization threshold : 100.00%     
        Output bandwidth utilization threshold: 100.00%     
        Input bandwidth utilization  :    0%                
    Output bandwidth utilization :    0%

  3. Contact the carrier to detect the line.
  4. Check whether the RJ45 interface connected to the network interface of the AR is an Ethernet interface. If not, connect the network cable to the Ethernet interface.

    The RJ45 interface is a universal interface. You can define pins according to your needs. Some needs are even defined as the power module and ground. During network interface connection, ensure that the Ethernet interface connects to the network cable. The interface may be damaged if a non-Ethernet interface connects to the network cable. After the network cable is connected, run the following cable to detect the cable connected to the Ethernet interface:


    When the following information is displayed, locate the fault according to Table 12-1 and the following information.

    Warning: The command will stop service for a while, continue [Y/N]?y                          
    Sep 28 2011 13:57:54+00:00 Huawei %%01IFPDT/4/VCT(l)[13]:The user choose YES when there is a selection about whether to run VCT.    
    Sep 28 2011 13:57:57+00:00 Huawei %%01IFPDT/4/IF_STATE(l)[14]:Interface GigabitEthernet0/0/0 has turned into DOWN state.            
    Sep 28 2011 13:57:57+00:00 Huawei %%01IFNET/4/LINK_STATE(l)[15]:The line protocol IP on the interface GigabitEthernet0/0/0 has enter
    ed the DOWN state.
    Pair A length: 0 meter(s)                               
    Pair B length: 0 meter(s)                               
    Pair C length: 0 meter(s)                               
    Pair D length: 0 meter(s)                               
    Pair A state: Ok  
    Pair B state: Ok  
    Pair C state: Ok  
    Pair D state: Ok
    Table 12-1  Description of the virtual-cable-test command output



    pair a/b/c/d

    Four pairs of circuits in a network cable.

    Pair A length

    Cable length:

    • The length is the distance between the interface and the fault point if a fault occurs.
    • The length is the actual length of the cable when the cable works properly.
    • The default length is 0 if no cable is connected.

    Pair A state

    Status of a circuit pair of the cable:

    • OK: The circuit pair is terminated normally.
    • Open: The circuit pair is not terminated.
    • Short: The circuit pair is short circuited.
    • Crosstalk: The circuit pairs interfere with each other.
    • Unknown: An unknown fault occurs on the circuit pair.

    Performing the preceding operations can solve most problems of the network interface not in Up state.

Updated: 2019-05-10

Document ID: EDOC1000079719

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