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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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Local Device Fails to Ping the Remote Device When the Link Protocol Status of Their Connected MFR Interfaces Is Up

Local Device Fails to Ping the Remote Device When the Link Protocol Status of Their Connected MFR Interfaces Is Up

Common Causes

Ping operations may be performed between directly connected devices or between indirectly connected devices.

This fault is commonly caused by one of the following:
  • In the scenario where basic MFR is configured:
    1. No IP address is assigned to the interface.
    2. The mapping between the PVC and peer IP address is not generated.
    3. The mapping between the PVC and peer IP address is generated but no route is generated.
  • In the scenario where PPPoMFR is configured:
    1. No IP address is configured in the virtual template interface.
    2. PPP negotiation fails.

Troubleshooting Flowchart

Figure 17-5 shows the troubleshooting flowchart in the scenario where basic MFR is configured.
Figure 17-5  Troubleshooting flowchart for a ping failure when basic MFR is configured

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

  • In the scenario where a MFR is configured:
    1. Check that a PVC is configured on the DTE-side interface.

      Run the display fr pvc-info interface serial command in the system view to check whether there is PVC information.

      [Huawei-MFR0/0/0]display fr pvc-info  interface  MFR 0/0/0                                                                          
      PVC statistics for interface MFR0/0/0 (DTE, physical UP)                                                                            
          DLCI = 22, USAGE = UNUSED (00000000), MFR0/0/0                                                                                  
          create time = 2007/11/28 12:14:44, status = ACTIVE                                                                              
          InARP = Enable, PVC-GROUP = NONE                                                                                                
          in packets = 22, in bytes = 994                                                                                                 
          out packets = 22, out bytes = 950                            
      
      • If no PVC information is displayed, no PVC exists on the interface. Configure the PVC on the DCE-side interface. If you are sure that the PVC exists on the DCE-side interface, you can also configure PVC on the DTE-side interface.
      • If the value of the status field is INACTIVE, there is a possibility that no PVC exists on the DCE-side interface. Configure the PVC on the DCE-side interface.
      • If the value of the status field is ACTIVE, the PVC functions properly. Go to step 2.
      NOTE:

      If a sub-interface is configured on the DTE-side interface, configure a DLCI for the sub-interface.

    2. Check that the number of PVCs configured on the DTE-side interface does not exceed the threshold.

      Run the display fr pvc-info command on the DTE-side interface to check the configured PVCs.

      [Huawei-MFR0/0/0]display fr pvc-info                                                                                                
      PVC statistics for interface MFR0/0/0 (DTE, physical UP)                                                                            
          DLCI = 22, USAGE = UNUSED (00000000), MFR0/0/0                                                                                  
          create time = 2007/11/28 12:14:44, status = ACTIVE                                                                              
          InARP = Enable, PVC-GROUP = NONE                                                                                                
          in packets = 29, in bytes = 1218                                                                                                
          out packets = 29, out bytes = 1160                                       
      
      If the number of configured PVCs has reached the threshold, no more PVCs can be created. The AR100&AR120&AR150&AR160&AR200&AR1200&AR2200&AR3200&AR3600 supports a maximum of 128 PVCs.
      • If the number of configured PVCs has exceeded the threshold, run the undo fr dlci dlci-number command to delete unnecessary PVCs.
      • If the number of configured PVCs does not exceed the threshold, go to step 3.
      NOTE:

      PVCs can be deleted only when their DLCIs are deleted from both the DCE and DTE.

    3. Check that IP addresses have been assigned to interfaces on both ends.

      Run the display this command in the MFR interface view to check whether an IP address is assigned to the interface.

      [Huawei-MFR0/0/0]display this                                              
      [V200R001C00B130]                                                                                                                   
      #                                                                                                                                   
      interface MFR0/0/0                                                                                                                  
       ip address 5.5.5.2 255.255.255.0       
      
      • If no IP address is assigned to the interface, assign an IP address to this interface.
      • If an IP address has been assigned to the interface, go to step 4.

    4. Check that InARP is enabled on the interface.

      Run the display this command on the interface to check the interface configuration.

      [Huawei-Serial2/0/0:2]display this                                              
      [V200R001C00B130]                                                                                                                   
      #                                                                                                                                   
      interface MFR0/0/0                                                                                                                  
       undo fr inarp                                                                                                                      
       ip address 5.5.5.2 255.255.255.0                                                                                                   
      #                                                                                                                                   
      return                                
      
      • If the undo fr inarp command has been run on the interface, InARP has been disabled on the interface. Run the fr inarp on the interface to enable InARP.
      • If InARP has been enabled on the interface, go to step 5.

    5. Check that the mapping between the PVC and peer address has been generated.

      Run the display fr map-info command to check whether the mapping between the PVC and peer address is generated.

      [Huawei]display fr map-info                                       
      Map Statistics for interface MFR0/0/0 (DTE)                                                                                         
        DLCI = 22, IP INARP 5.5.5.1, MFR0/0/0                                                                                             
          create time = 2007/11/28 14:04:21, status = ACTIVE                                                                              
          encapsulation = ietf, vlink = 2, broadcast              
      
      • If no mapping is generated, configure the mapping between the PVC and peer address.
      • If the mapping has been generated, go to step 6.

    6. Check that both ends have reachable routes to each other.

      Run the display fib command to check the routing table.

      [Huawei-MFR0/0/0]display this  
      #                                                                                                                                   
      interface MFR0/0/0                                                                                                                  
       ip address 5.5.5.2 255.255.255.0                                                                                                                                            
      return                                                                                                
      [Huawei-MFR0/0/0]display fib                                                   
      Route Flags: G - Gateway Route, H - Host Route,    U - Up Route                                                                     
                   S - Static Route,  D - Dynamic Route, B - Black Hole Route                                                             
      ------------------------------------------------------------------------------                                                      
       FIB Table:                                                                                                                         
       Total number of Routes : 17                                                                                                        
                                                                                                                                          
      Destination/Mask   Nexthop         Flag TimeStamp     Interface       TunnelID                                                      
      5.5.5.1/32         5.5.5.1         HU    t[2082]       MFR0/0/0        0x0                                                       
      5.5.5.255/32       127.0.0.1       HU    t[1025]       InLoop0         0x0                                                          
      5.5.5.2/32         127.0.0.1       HU    t[1025]       InLoop0         0x0                                                          
      50.1.1.255/32      127.0.0.1       HU    t[545]        InLoop0         0x0                                                          
      50.1.1.1/32        127.0.0.1       HU    t[545]        InLoop0         0x0                                                          
      192.168.0.255/32   127.0.0.1       HU    t[501]        InLoop0         0x0                                                          
      192.168.0.23/32    127.0.0.1       HU    t[501]        InLoop0         0x0                                                          
      6.6.6.255/32       127.0.0.1       HU    t[496]        InLoop0         0x0                                                          
      6.6.6.2/32         127.0.0.1       HU    t[496]        InLoop0         0x0                                                          
      255.255.255.255/32 127.0.0.1       HU    t[487]        InLoop0         0x0                                                          
      127.255.255.255/32 127.0.0.1       HU    t[487]        InLoop0         0x0                                                          
      127.0.0.1/32       127.0.0.1       HU    t[487]        InLoop0         0x0                                                          
      127.0.0.0/8        127.0.0.1       U     t[487]        InLoop0         0x0                                                          
      6.6.6.0/24         6.6.6.2         U     t[496]        VT3             0x0                                                          
      192.168.0.0/24     192.168.0.23    U     t[501]        GE0/0/0         0x0                                                          
      50.1.1.0/24        50.1.1.1        U     t[545]        S2/0/1:23       0x0                                                          
      5.5.5.0/24         5.5.5.2         U     t[1025]       MFR0/0/0        0x0                             
      

      In the command output, the local IP address is 5.5.5.2, the peer IP address is 5.5.5.1, and the information in bold indicates the correct routing entry.

      • If the preceding routing entry is not displayed, configure this route.
      • If the preceding routing entry is displayed, go to step 7.

    7. 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

Views: 449565

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