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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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Packets in the EF Queue Are Lost

Packets in the EF Queue Are Lost

Problem Description

The voice quality is low.

Cause Analysis

  1. Check whether packets in the EF queue are lost. Run the display traffic policy statistics command to check the value of Discarded under Queue Matched. If the value of Discarded is 0, no packet is lost.
    <Huawei> display traffic policy statistics interface gigabitEthernet 0/0/0 outbound verbose classifier-base
     Interface: GigabitEthernet0/0/0   
     Traffic policy outbound: a  
     Rule number: 3  
     Current status: OK!  
    Item                 Sum(Packets/Bytes)        Rate(pps/bps)
    Matched                        0/0                      0/0   
      Passed                       0/0                      0/0 
      Dropped                      0/0                      0/0 
        Filter                     0/0                      0/0 
        CAR                        0/0                      0/0 
      Queue Matched                0/0                      0/0 
      Enqueued                     0/0                      0/0 
      Discarded                    0/0                      0/0 
      CAR                          0/0                      0/0 
        Green packets              0/0                      0/0 
        Yellow packets             0/0                      0/0 
        Red packets                0/0                      0/0 
  2. Check whether the packets that do not need to be protected match the EF queue.
    1. Do not send protected traffic. For example, if voice packets from phones need to be protected, do not make calls.
    2. Run the reset traffic policy statistics command to clear statistics on packets matching a traffic policy.
    3. After a while, run the display traffic policy statistics command to check whether packets match the EF queue. If the value of Enqueued under Queue Matched is a non-0 value, matching rules in the traffic classifier may be incorrect and other packets match the EF queue.
  3. The configured CBS (maximum volume of burst traffic that can pass through an interface) is small, but there is EF traffic burst.


  • Run the queue ef command to increase the CBS.
  • Run the traffic classifier command to enter the traffic classifier view to modify matching rules in the traffic classifier.


EF is applied to the services that require the low delay, low drop probability, assured bandwidth, and occupy low bandwidth, for example, voice packets. Based on the preceding analysis, when packets are lost, increase the CBS or modify matching rules in the traffic classifier.

Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 456294

Downloads: 4321

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