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S12700 V200R013C00 Configuration Guide - QoS

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, ACL-based simplified traffic policy, and HQoS.
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Configuring a WRED Drop Profile

Configuring a WRED Drop Profile


A WRED drop profile defines the upper drop threshold, lower drop threshold, and drop probability for different colored packets. WRED randomly discards packets based on drop parameters to prevent global TCP synchronization, and defines different drop policies based on packet colors. WRED discards packets based on packet priorities. Packets with higher priorities have a low probability of being discarded. For more information about packet colors, see Configuring Priority Mapping.


Congestion avoidance applies only to unicast traffic.


  1. Run system-view

    The system view is displayed.

  2. Run drop-profile drop-profile-name

    A WRED drop profile is created and the drop profile view is displayed.

    By default, the WRED drop profile default exists, which can be modified but not deleted.

  3. Run color { green | non-tcp | red | yellow } low-limit low-limit-percentage high-limit high-limit-percentage discard-percentage discard-percentage

    WRED parameters are set. low-limit specifies the lower threshold, high-limit specifies the upper threshold, and discard-percentage specifies the maximum drop probability.

    By default, low-limit, high-limit, and discard-percentage of a WRED drop profile are all set to 100.


    The WRED algorithm for non-TCP packets cannot be used on SA series cards.

  4. (Optional) Run queue-depth queue-depth-value

    The length of the port queue is set.


    Only X1E series cards support this command.

Updated: 2019-04-08

Document ID: EDOC1100065653

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