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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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Configuring Outbound Interface-based Rate Limiting

Configuring Outbound Interface-based Rate Limiting


To control the rate of all outgoing traffic on an interface, configure outbound interface-based rate limiting. When the transmit rate of packets exceeds the rate limit, excess packets are placed in the buffer queue. When there are sufficient tokens in the token bucket, the device forwards the buffered packets at an even rate. When the buffer queue is full, the device discards the buffered packets.

When the outgoing traffic rate on an interface exceeds the alarm threshold, an alarm is generated.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run qos lr cir cir-value [ kbps | mbps | gbps ] [ cbs cbs-value [ bytes | kbytes | mbytes ] ] [ outbound ]

    Outbound interface-based rate limiting is configured.

    By default, the rate limit on an interface is the maximum bandwidth of the interface.


    If the packet forwarding mode is set to Cut Through on a CE8860EI, CE8850EI, CE7855EI, CE7850EI, CE6860EI, CE6855HI, CE6856HI, CE6850U-HI, CE6851HI, or CE6850HI switch, the switch does not support outbound interface-based rate limiting. Before configuring outbound interface-based rate limiting, run the assign forward mode store-and-forward command to change the packet forwarding mode to store-and-forward.

  4. Run commit

    The configuration is committed.

Updated: 2019-03-21

Document ID: EDOC1000166640

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