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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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The Delay in the EF Queue Is Long

The Delay in the EF Queue Is Long

Problem Description

The delay refers to the period from the time packets start to be transmitted to the time packet transmission is completed. Generally, the delay on a high-speed device is smaller than 10 ms.

Cause Analysis

  1. The CPU usage of the device is too high. As a result, the packet processing speed is reduced.
  2. There are too many burst packets. The configurations need to be changed so that packets can be processed correctly.
  3. Other network devices may cause the delay. Check the configuration of these network devices.


If there are too many burst packets, perform the following operations to solve the problem:

  1. Run the display traffic policy statistics command to check statistics on packets matching a traffic policy on an interface. Check the value of Dropped to determine whether packets are lost. If packets are lost, there may be too many packets.
  2. Run the queue afqueue ef, or queue llq command to configure the maximum allowed bandwidth to ensure that packets can pass through.


Prevent a high CPU usage and preferentially configure Low Latency Queuing (LLQ) during bandwidth reconfiguration. LLQ queues are a special type of EF queues and have a shorter delay.

Updated: 2019-05-10

Document ID: EDOC1000079719

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