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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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Using reset Commands

Using reset Commands

Context

When you use the ping command to test link connectivity, you also need to run the display interface or display ip interface command to check whether packets are correctly sent and received on interfaces and whether a CRC error occurs. Then you can locate the interface where the fault occurs.

The display interface or display ip interface command output shows packet statistics generated after the device starts or the counter is reset; therefore, the packet statistics may contain unnecessary information that interferes with fault location.

To collect packet statistics accurately, perform the following operations:

Procedure

  1. Run the reset counters interface or reset ip statistics command to clear existing packet statistics.
  2. Run the ping command to enable router interfaces to send and receive packets.
  3. Run the display interface or display ip interface command to view the statistics.

Example

For example, after you run the display interface ethernet 1/0/0 command, the following statistics are displayed:

Input:  736 packets, 344842 bytes                                               
  Unicast:                  0,  Multicast:                 714                  
  Broadcast:               22,  Jumbo:                       0                  
  Discard:                  0,  Total Error:                 0                  
                                                                                
  CRC:                      0,  Giants:                      0                  
  Jabbers:                  0,  Throttles:                   0                  
  Runts:                    0,  Symbols:                     0                  
  Ignoreds:                 0,  Frames:                      0                  
                                                                                
Output:  2911 packets, 514228 bytes                                             
  Unicast:                  0,  Multicast:                2910                  
  Broadcast:                1,  Jumbo:                       0                  
  Discard:                  0,  Total Error:                 0                  
                                                                                
  Collisions:               0,  ExcessiveCollisions:         0                  
  Late Collisions:          0,  Deferreds:                   0  

If the value of Total Error is not 0, there is an error in packet sending and receiving.

To check when the error occurs, run the reset counters interface ethernet 1/0/0 command to clear existing statistics, use the ping command to send ping packets, and run the display interface ethernet 1/0/0 command to view new statistics. If the Total Error value is still not 0, the error may need to be rectified.

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Updated: 2019-08-09

Document ID: EDOC1000079719

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