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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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E1/T1 Interface in Up State Fails to Correctly Send and Receive Data

E1/T1 Interface in Up State Fails to Correctly Send and Receive Data

Common Causes

This fault occurs in the following situations:
  • No data is sent or received on the serial interface.
  • Data is incorrectly sent or received on the serial interface.
This fault is commonly caused by one of the following:
  • The CPLD logic version of the E1/T1 board is incorrect.
  • Timeslots of the remote interface are incorrectly bound.

Troubleshooting Flowchart

Figure 15-4 shows the troubleshooting flowchart.
Figure 15-4  E1/T1 interface in Up state failing to correctly send and receive data

Troubleshooting Procedure

NOTE:

Saving the results of each troubleshooting step is recommended. If troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel.

Procedure

  1. Check that the local and remote interfaces have the same configurations.

    Run the display this command in the controller interface view to check the controller interface configuration.
    [Huawei]controller e1 1/0/0
    [Huawei-E1 1/0/0]display this
    [V200R001C00B000]                                                               
    #                                                                               
    controller E1 1/0/0                                                             
     channel-set 0 timeslot-list 1                                                  
    frame-format crc4
    clock master                                                              
    #                                                                               
    return           
    

    Check whether physical attributes of the local and remote controller interfaces are the same. For example, check whether their frame formats are both CRC4, whether their encoding and decoding modes are both HDB3, whether both of them are configured not to invert data, and whether their timeslots bound to form a channel are the same. In addition, check whether the two controller interfaces are configured to work in master clock mode and slave clock mode respectively.

    • If the two controller interfaces have different configurations or frequently alternate between Up and Down states, reconfigure the two interfaces.

    • If the two controller interfaces have the same configurations and remain Up, go to step 2.

  2. Check that the local and remote serial interfaces have the same configurations.

    Run the display this command in the serial interface view to check the serial interface configuration.
    [Huawei-E1 1/0/0]int serial 1/0/0:0                                                
    [Huawei-Serial1/0/0:0]display this                                                  
    [V200R001C00B000]                                                               
    #                                                                               
    interface Serial1/0/0:0                                                         
     link-protocol ppp                                                              
     timer hold 0                                                                   
     ip address 1.1.1.2 255.255.255.0                                               
    #                                                                               
    return                               
    
    

    Check whether the two serial interfaces have the same protocol configurations and physical attributes, whether they are encapsulated with PPP, and whether they use the default 16-bit CRC. Check whether they have been shut down.

    NOTE:

    If interfaces on both ends have different CRC configurations, communication between them will fail because of CRC errors.

    • If the two serial interfaces have different configurations, reconfigure them.
    • If the two serial interfaces have the same configurations but cannot correctly send or receive data, go to step 3.
  3. Check whether the local and remote serial interfaces are sending and receiving data.

    Run the display this interface command in the serial interface view to check the serial interface status.

    [Huawei-Serial1/0/0:0] display this interface
    Serial1/0/0:0 current state : UP                                                
    Line protocol current state : UP                                                
    Last line protocol up time : 2008-01-08 02:59:55 UTC-05:13                      
    Description:HUAWEI, AR Series, Serial1/0/0:0 Interface                     
    Route Port,The Maximum Transmit Unit is 1500, Hold timer is 0(sec)              
    Derived from E1 1/0/0,  Timeslot(s) Used: 1,  baudrate is 64000 bps             
    Internet Address is 1.1.1.2/24                                                  
    Link layer protocol is PPP                                                      
    LCP opened, IPCP opened                                                         
    Last physical up time   : 2008-01-08 02:59:52 UTC-05:13                         
    Last physical down time : 2008-01-07 22:40:43 UTC-05:13                         
    Current system time: 2008-01-08 03:33:42-05:13 
    Last 300 seconds input rate 213795 bytes/sec 1710360 bits/sec 4276 packets/sec
    Last 300 seconds output rate 213796 bytes/sec 1710368 bits/sec 4276 packets/sec
    Input: 140727 packets, 12665430 bytes                                           
      length errors:           0,  giants:                  0                       
      CRC:                     0,  align errors:            0                       
      aborts:                  0,  no buffers:              0                       
    Output: 0 packets, 0 bytes                                          
      too long errors:         0                                                    
                                                                                    
        Input bandwidth utilization  : 0.00%                                        
        Output bandwidth utilization : 0.00%                                         
    

    • Check whether the two serial interfaces are sending data. If they are not sending data, upper-layer negotiation packets are not sent. Run the shutdown or undo shutdown command on them to enable the upper layer to send packets.
    • If the two serial interfaces are sending and receiving data, go to step 4.
  4. Check whether the local and remote serial interfaces have sent and received error packets.

    Run the display this interface command in the serial interface view to check the serial interface status.

    [Huawei-Serial1/0/0:0] display this interface
    Serial1/0/0:0 current state : UP
    Line protocol current state : UP
    Last line protocol up time : 2011-03-24 13:52:40
    Description:HUAWEI, AR Series, Serial1/0/0:0 Interface
    Route Port,The Maximum Transmit Unit is 1500, Hold timer is 10(sec)
    Derived from E1 4/0/0,  Timeslot(s) Used: 1-31,  baudrate is 1984000 bps
    Internet Address is 192.168.22.2/24
    Link layer protocol is PPP
    LCP opened, IPCP opened
    Last physical up time   : 2011-03-24 13:46:02
    Last physical down time : 2011-03-24 13:46:02
    Current system time: 2011-03-24 14:03:31
    Last 300 seconds input rate 213795 bytes/sec 1710360 bits/sec 4276 packets/sec
    Last 300 seconds output rate 213796 bytes/sec 1710368 bits/sec 4276 packets/sec
    
    Input: 2779788 packets, 138980787 bytes
      length errors:           0,  giants:                  0
      CRC:                     1,  align errors:            0
      aborts:                  0,  no buffers:              1
    Output: 2780617 packets, 139022246 bytes
      too long errors:         0
    
        Input bandwidth utilization  : 86.21%
        Output bandwidth utilization : 86.21% 
    

    • Check whether the two serial interfaces have received a large number of CRC error packets. If so, check whether the cable between them is properly installed.
    • If the fault persists after the cable is properly installed, go to step 5.
  5. Collect the following information and contact technical support personnel.
    • Results of the preceding troubleshooting procedure

    • Configuration files, log files, and alarm files of the device

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Updated: 2019-05-10

Document ID: EDOC1000079719

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