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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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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 6-2 Products and minimum version supporting congestion management and congestion avoidance

Product

Minimum Version Required

CE5810EI

V100R002C00

CE5850EI

V100R001C00

CE5850HI

V100R003C00

CE5855EI

V100R005C10

CE5880EI

V200R005C10

CE6810EI

V100R003C00

CE6810-48S4Q-LI/CE6810-48S-LI

V100R003C10

CE6810-32T16S4Q-LI/CE6810-24S2Q-LI

V100R005C10

CE6850EI

V100R001C00

CE6850-48S6Q-HI

V100R005C00

CE6850-48T6Q-HI/CE6850U-HI/CE6851HI

V100R005C10

CE6855HI

V200R001C00

CE6856HI

V200R002C50

CE6857EI

V200R005C10

CE6860EI

V200R002C50

CE6865EI

V200R005C00

CE6870-24S6CQ-EI/CE6870-48S6CQ-EI

V200R001C00

CE6870-48T6CQ-EI

V200R002C50

CE6875-48S4CQ-EI

V200R003C00

CE6880EI

V200R002C50

CE7850EI

V100R003C00

CE7855EI

V200R001C00

CE8850-32CQ-EI

V200R002C50

CE8850-64CQ-EI

V200R005C00

CE8860EI

V100R006C00

CE8861EI

V200R005C10

CE8868EI

V200R005C10

Feature Limitations

Limitations on Congestion Avoidance

  • Congestion avoidance is valid for only known unicast packets.
  • For the CE6860EI, CE8850EI, and CE8860EI in earlier versions of V200R003C00, the non-tcp parameter in the color command cannot be used to set the ECN threshold of non-TCP packets. In this situation, non-TCP packets and TCP packets are marked based on the thresholds specified by green, yellow, and red in the color command. Starting from V200R003C00, you are advised to use the ecn command to set thresholds.
  • 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.
  • When multiple interfaces send traffic to an interface, if there is burst traffic and the burst traffic volume exceeds the maximum allocated buffer, the switch discards excess packets. The switch's capability to forward burst traffic can be improved by running the qos burst-mode enhanced command to set the burst mode to enhanced.

Limitations on Congestion Management

  • On the CE6870EI and CE6875EI, congestion management is valid for only known unicast traffic.
  • On the CE6810LI, CE6810EI, CE6850EI, CE6860EI, CE6870EI, CE6875EI, CE6880EI, CE5880EI, and CE5850HI, queues 0 to 5 use WRR, DRR, or PQ scheduling, and queues 6 and 7 use PQ scheduling.
  • Congestion management cannot be configured in shared mode because low-priority packets are scheduled before high-priority packets.

Limitations on Queue-based Traffic Statistics

  • For CE switches excluding CE6870EI and CE6875EI, the queue-based traffic statistics precision on an interface is 2 minutes. That is, statistics collected after 2 minutes are accurate. For CE6870EI and CE6875EI switches, the queue-based traffic statistics precision on an interface is 10 minutes. That is, statistics collected after 10 minutes are accurate.
  • When the CE6870EI 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. V200R003C00 and later versions do not have this limitation.
  • On the CE5810-48T4S-EI and CE5855-48T4S2Q-EI, if the inbound and outbound interfaces of packets are located on different chips, the statistics on the bytes of discarded packets do not contain the VLAN field. That is, four bytes are not counted.
  • On a stack device, if the inbound and outbound interfaces of packets are located on different member devices, the statistics on the bytes of discarded packets do not contain the VLAN field. That is, four bytes are not counted.

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Updated: 2019-03-21

Document ID: EDOC1000166640

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