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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 Policing, Traffic Shaping, and Interface-based Rate Limiting (CE Switches Excluding CE6870EI and CE6875EI)

Licensing Requirements and Limitations for Traffic Policing, Traffic Shaping, and Interface-based Rate Limiting (CE Switches Excluding CE6870EI and CE6875EI)

Involved Network Elements

Other network elements are not required.

Licensing Requirements

Traffic policing, traffic shaping, and interface-based rate limiting are basic features of a switch and are not under license control.

Version Requirements

Table 5-6 Products and minimum version supporting traffic policing, traffic shaping, and interface-based rate limiting


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
CE6880EI V200R002C50
CE7850EI V100R003C00
CE7855EI V200R001C00
CE8860EI V100R006C00
CE8850-32CQ-EI V200R002C50
CE8850-64CQ-EI V200R005C00
CE8861EI V200R005C10
CE8868EI V200R005C10

Feature Limitations

  • After traffic policing is configured, the device performs CAR for all packets, including both protocol packets and data packets.
  • The device applies CAR to interfaces of the same chip resource uniformly and applies CAR to interfaces on different chip resources separately. When the traffic policy containing traffic policing is applied to the Eth-Trunk, the system, or a VLAN, if interfaces of the object to which the traffic policy is applied belong to N chip resources, the actual rate limit is N times as large as the CAR value.

    Assume that 10GE1/0/1 and 10GE1/0/2 belong to chip resource 0 and 10GE1/0/25 and 10GE1/0/26 belong to chip resource 1. If 10GE1/0/1, 10GE1/0/2, 10GE1/0/25, and 10GE1/0/26 join VLAN 10 and the traffic policy containing the rate limit of 1 Mbit/s is applied to VLAN 10, the rate limit of 10GE1/0/1 and 10GE1/0/2 is 1 Mbit/s and the rate limit of 10GE1/0/25 and 10GE1/0/26 is 1 Mbit/s. That is, the rate limit is 2 Mbit/s after the traffic policy is applied to VLAN 10.

    Use the tool for querying relationships between ports and chip resources to query the relationship between ports and chip resources.

Limitations on MQC-based traffic policing
  • On the CE5850EI, the traffic policy containing CAR cannot be applied to the outbound direction.
  • When traffic policing is defined in a traffic behavior, ensure that the following conditions are met: PBS > CBS = CIR/8 x Coefficient x 1000, where the coefficient is in the range from 1 to 1.5.
  • If a traffic policy in the outbound direction contains car, apply the traffic policy to an interface, a VLAN, and the system in sequence. Otherwise, resources cannot be fully used and the traffic policy fails to be delivered.
  • When both QoS CAR and MQC are used on an interface for traffic statistics collection, statistics about packets to which a QoS CAR profile is applied contain only the packets that do not match the traffic policy.
Limitations on hierarchical traffic policing
  • A maximum of 512 QoS profiles can be created on the device.
  • Only the CE5800 series switches except the CE5880EI and CE5850HI support hierarchical traffic policing.
  • Hierarchical traffic policing supports only the single-rate-single-bucket mechanism, and cannot be applied to the outbound direction.
  • Aggregated CAR in a traffic policy is performed only on an object to which the traffic policy is applied. For example, if the traffic policy p1 containing aggregated CAR is applied to interfaces 1 and 2, aggregated CAR is performed on interfaces 1 and 2 separately.
  • If a QoS CAR profile and a traffic policy containing the traffic policing action are applied to the same interface, QoS CAR parameters defined in the QoS CAR profile do not take effect. This is because the traffic policy takes precedence over the QoS CAR profile.
Limitations when traffic policing is used with other services
  • If the packet forwarding mode on the CE6800 (except the CE6865EI, CE6850HI, CE6850U-HI, CE6851HI, CE6855HI, CE6856HI, CE6857EI, and CE6880EI) is set to cut-through, a traffic policy containing car cannot be applied to the outbound direction. If car is required, change the packet forwarding mode to store-and-forward or apply the traffic policy containing car to the inbound direction.
  • When the packet forwarding mode on the CE8860EI, CE8861EI, CE8868EI, CE8850EI, CE7855EI, CE7850EI, CE6865EI, CE6860EI, CE6857EI, CE6855HI, CE6856HI, CE6850U-HI, CE6851HI, or CE6850HI is set to cut-through, a traffic policy defining car cannot be configured. To use car, change the packet forwarding mode to store-and-forward.

Limitations on traffic shaping
  • Traffic shaping can only be configured on an interface in the outbound direction.
  • If both queue-based traffic shaping and outbound rate limiting are configured on an interface, the CIR of outbound rate limiting cannot be smaller than the sum of CIR values of all the queues on the interface; otherwise, traffic shaping may be abnormal. For example, a low-priority queue preempts the bandwidth of a high-priority queue.
  • Traffic shaping increases the delay because it uses the buffer mechanism.
Limitations on interface-based rate limiting

The rate limit of traffic on the management interface cannot be smaller than 100 pps; otherwise, FTP, Telnet, SFTP, STelnet, and SSH functions may be affected.

Updated: 2019-03-21

Document ID: EDOC1000166640

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