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Configuration Guide - QoS

CloudEngine 12800 and 12800E V200R003C00

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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Licensing Requirements and Limitations for Congestion Avoidance and Congestion Management

Licensing Requirements and Limitations for Congestion Avoidance and Congestion Management

Involved Network Elements

Other network elements are not required.

Licensing Requirements

Congestion management and congestion avoidance are basic features of a switch and are not under license control.

Version Requirements

Table 6-1 Products and minimum version supporting congestion management and congestion avoidance


Minimum Version Required









Feature Limitations

Limitations on Congestion Avoidance

  • Congestion avoidance is valid for only known unicast packets.
  • A maximum of 64 WRED drop profiles, including the WRED drop profile default, can be configured. The WRED drop profile default can be modified but cannot be deleted.
  • If you apply a WRED drop profile to an interface and an interface queue simultaneously, the WRED drop profile that is applied to the interface queue first takes effect.

Limitations on Congestion Management

Congestion management is valid for only known unicast traffic.

Limitations on Queue-based Traffic Statistics

  • For CE12800E, the queue-based traffic statistics precision on an interface is 2 minutes. That is, statistics collected after 2 minutes are accurate. For CE12800, the queue-based traffic statistics precision on an interface is 10 minutes. That is, statistics collected after 10 minutes are accurate.
  • When CE12800 in an earlier version of V200R003C00 uses the traffic statistics function to count known unicast packets on the outbound interface, the statistics on discarded packets include the packets that are discarded because MQC-based traffic policing, hierarchical traffic policing, traffic suppression, and storm control are applied in the inbound direction. Starting from V200R003C00, there is no such a limitation for SD, FD, FD1, FDA, FG, and FG1 series card.

Limitations When Congestion Avoidance and Congestion Management Are Used with Other Services

  • Global ECN cannot be enabled in a VS except the Admin-VS in port mode, whereas global ECN that is enabled in the Admin-VS takes effect in other VSs in port mode. Global ECN can be enabled in a VS in port group mode and takes effect only in this VS.
  • The device can be enabled to generate an alarm when the queue buffer exceeds the threshold only in the Admin-VS. The configured alarm function is valid for all VSs.
Updated: 2019-05-05

Document ID: EDOC1100004202

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