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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 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 10-2 Products and minimum version supporting traffic statistics

Product Model

Minimum Version Required

CE12804/CE12808/CE12812

V100R001C00

CE12816

V100R003C00

CE12804S/CE12808S

V100R005C00

CE12800E

V200R002C50

Feature Limitations

  • When a traffic policy containing traffic statistics is configured in the outbound direction on the CE12800, note the following points:
    • Interface view: In V100R006C00 and earlier versions, the traffic policy can be configured only on a physical interface or Layer 3 sub-interface. In V200R001C00 and later versions, the traffic policy can be configured only on a physical interface, Eth-Trunk interface, or Layer 3 sub-interface.
    • VLAN view: The interface that joins a VLAN must be located on the CE-L48GT or CE-L48GS card, and the VS on the CE-L48GT or CE-L48GS card must work in group mode. In this situation, the switch only collects statistics on packets in the VLAN on the CE-L48GT or CE-L48GS card.
  • 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.

  • 48GE cards do not support traffic statistics for double-tagged packets that match Layer 3/4 fields in the outbound direction.
  • On cards except CE-L48GT and CE-L48GS series cards, when the traffic policy defining traffic statistics is applied in the outbound direction, the following situations may occur:

    • If all physical interfaces to which the traffic policy is applied belong to the same forwarding chip, the maximum bandwidth is 100 Gbit/s.

      On the CE-L24LQ-EA card, interfaces 0 to 5 belong to chip 0, interfaces 6 to 11 belong to chip 1, interfaces 12 to 17 belong to chip 2, and interfaces 18 to 23 belong to chip 3. When the traffic policy defining traffic statistics is applied to four interfaces (for example, interfaces 0, 6, 12, and 18) in different chips in the outbound direction, the maximum bandwidth is 160 Gbit/s (4x40 Gbit/s). When the traffic policy defining traffic statistics is applied to four interfaces (for example, interfaces 0 to 3) in the same chip in the outbound direction, the maximum bandwidth is 100 Gbit/s.

    • The card forwarding performance is reduced. The reduced performance depends on the number of interfaces to which the traffic policy is applied. More interfaces to which the traffic policy is applied indicate more reduced performance.

      Assuming that the number of 10GE ports on a card is M and a traffic policy containing CAR or traffic statistics is applied to N interfaces in the outbound direction, the performance is reduced to (10 Gbit/s x M) x M/(M+N). For example, when a traffic policy containing CAR is applied to an interface on the 24*10GE card, the forwarding performance is reduced from 240 Gbit/s to 230.4 Gbit/s that is calculated using (10 Gbit/s x 24) x 24/(24+1). When a traffic policy containing CAR is applied to 24 interfaces, the forwarding performance is reduced to 100 Gbit/s.

  • 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 CE12800, 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 CE12800, 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 10-3 Priorities of the traffic statistics collection functions

    Card

    Priority

    CE12800E equipped with ED-E, EG-E, or EGA-E series cards

    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

    CE12800E equipped with FD-X series cards

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

    MQC-based traffic statistics collection is compatible with the statistics collection functions.

    CE12800 series switches

    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 CE12800 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 switch equipped with SD, FD, FD1, FDA, FG, and FG1 series cards, 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.
  • On the CE12800, 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: 2019-05-05

Document ID: EDOC1100004202

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