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Configuration Guide - QoS

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes the configurations of QoS functions, including MQC, priority mapping, traffic policing, traffic shaping, interface-based rate limiting, congestion avoidance, congestion management, packet filtering, redirection, traffic statistics, and ACL-based simplified traffic policy.
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Configuring Congestion Monitoring and Analysis

Configuring Congestion Monitoring and Analysis


On an enterprise network, congestion mainly affects network performance and results in problems such as transmission delay and signal loss. Congestion monitoring and analysis of each interface queue on a network device help you to learn the buffer usage of each queue and information about packets that cause congestion, providing guidance to planning and adjusting network traffic.

Interface-based congestion analysis affects the system performance, so do not enable interface-based congestion analysis for a long period of time.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run qos [ queue queue-index ] buffer-monitoring enable

    Queue-based congestion monitoring is enabled.

    By default, queue-based congestion monitoring is disabled.

  4. (Optional) Run qos [ queue queue-index ] buffer-monitoring percent low low-percent high high-percent

    The upper and lower buffer thresholds are configured.

    By default, the lower buffer threshold is 5% of the queue buffer space and the upper buffer threshold is 90% of the queue buffer space.

  5. Run qos buffer-monitoring parse enable

    Congestion analysis is enabled on an interface.

    By default, congestion analysis is disabled on an interface.

  6. Run commit

    The configuration is committed.

Verifying the Configuration

  • Run the display qos buffer-monitoring result interface interface-type interface-number command to check real-time buffer usage of queues.

  • Run the display qos buffer-monitoring result history interface interface-type interface-number [ queue queue-index ] [ record-number record-number ] command to check historical congestion monitoring information about queues.

  • Run the display qos buffer-monitoring parse result [ interface interface-type interface-number ] command to check the packet analysis result of an interface.

Updated: 2019-03-21

Document ID: EDOC1000166640

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