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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 Traffic Statistics

Licensing Requirements and Limitations for Traffic Statistics

Involved Network Elements

Other network elements are not required.

Licensing Requirements

The traffic statistics function is a basic feature of a switch and is not under license control.

Version Requirements

Table 11-2 Products and minimum version supporting traffic statistics

Product Model

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

  • On the CE6870EI and CE6875EI, a traffic policy containing traffic statistics collection can be applied to the outbound direction only on a physical interface and its Layer 3 sub-interfaces.

  • By default, the device does not calculate the inter-frame gap and preamble of Ethernet frames during traffic statistics collection. Starting from V100R005C00, after the qos statistics ifg enable command is used, the device calculates the inter-frame gap and preamble of Ethernet frames during traffic statistics collection.

  • If the traffic policy contains a lot of rules and traffic statistics have been cleared, wait for a period before querying traffic statistics. Otherwise, no information is displayed.
  • For CE6870EI and CE6875EI switches, outbound traffic statistics cannot be used with outbound interface-based rate limiting, queue-based traffic shaping, ETS, or PFC.
  • When the traffic statistics function is configured in the outbound direction on the CE6870EI and CE6875EI, if traffic exceeds the bandwidth of the outbound interface, the actual volume of forwarded traffic is lower than the interface bandwidth. In this case, ensure that the traffic volume is within the interface bandwidth.
  • For all models running earlier versions of V100R006C00, the following traffic statistics collection functions are in descending order of priority: traffic statistics collection in a VLAN, MQC-based traffic statistics collection, and traffic statistics collection on a VLANIF interface. When all of the three traffic statistics collection functions are configured, only the traffic statistics collection function with the highest priority takes effect. The following table lists the priorities of the traffic statistics collection functions in V100R006C00 and later versions.
    Table 11-3 Priorities of the traffic statistics collection functions

    Model

    Priority

    CE5880EI, CE6880EI

    Traffic statistics collection in a VLAN > Traffic statistics collection on a VLANIF interface

    Traffic statistics collection on 5-tuple information of IP packets and MQC-based traffic statistics collection are compatible with the statistics collection functions.

    CE6850EI, CE6810EI, CE6810LI, CE5855EI, and CE5810EI

    Traffic statistics collection on 5-tuple information of IP packets > Traffic statistics collection in a VLAN > MQC-based traffic statistics collection > Traffic statistics collection on a VLANIF interface

    Other models

    Traffic statistics collection on 5-tuple information of IP packets > MQC-based traffic statistics collection > Traffic statistics collection on a VLANIF interface

    Traffic statistics collection in a VLAN is compatible with the statistics collection functions.

  • For CE6870EI and CE6875EI switches: Among 5-tuple, BD, MQC, and VXLAN tunnel traffic statistics collection, the first has the highest priority and the last has the lowest priority. If two or all of them are configured, only the one with the highest priority takes effect.
  • When the MQC-based traffic statistics function is configured on an Eth-Trunk in the outbound direction of the CE6870EI and CE6875EI, multicast packets of member interfaces in Up state are counted repeatedly. When the MQC-based traffic statistics function is configured in the system in the outbound direction and the outbound interface is an Eth-Trunk, multicast packets of member interfaces in Up state are also counted repeatedly.
  • When a traffic policy containing many rules and the traffic statistics action is configured and the statistics are being queried based on instances or traffic classifiers, command line execution is interrupted and MIB-based query expires. By default, the timeout interval of MIB-based query is 5s and only statistics on packets matching the traffic policy within 1024 rules can be queried. When a traffic policy defines more than 1024 rules, the timeout interval of MIB-based query needs to be changed based on the data volume, and statistics are collected from the cached data.
  • The switch excluding the CE5880EI, CE6870EI, CE6875EI, and CE6880EI does not support traffic statistics on discarded invalid packets. To collect statistics on discarded invalid packets, define if-match discard in the traffic policy.
  • On the CE6870EI or CE6875EI, the packets discarded by ports or denied by ACLs can be mirrored but cannot be counted if the switch meets the following conditions:
    • Port mirroring or MQC-based traffic mirroring is configured.
    • MQC-based traffic statistics collection is configured.
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Updated: 2019-03-21

Document ID: EDOC1000166640

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