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S12700 V200R010C00 Configuration Guide - QoS

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, ACL-based simplified traffic policy, and HQoS.

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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.


  1. Run:


    The system view is displayed.

  2. (Optional) Run:

    qos-shaping exclude-interframe

    The system is configured not to count the inter-frame gap and preamble of packets when calculating the outgoing traffic rate.


    The qos-shaping exclude-interframe command configures the system not to count the inter-frame gap and preamble of packets when calculating the traffic rate for traffic shaping or outbound interface-based rate limiting.

  3. Run:

    interface interface-type interface-number

    The interface view is displayed.

  4. Run:

    qos lr cir cir-value [ cbs cbs-value ] [ 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 maximum link bandwidth and maximum reservable bandwidth are configured for an MPLS TE tunnel, the rate limit set by the qos lr command on the tunnel interface must be larger than the maximum reservable bandwidth of the MPLS TE tunnel.

    • If both queue-based traffic shaping and rate limiting are configured on an interface, the CIR configured for the interface must be greater than or equal to the sum of CIR values of all queues on the interface; otherwise, traffic shaping may be incorrect. For example, a low-priority queue may preempt the bandwidth of a high-priority queue.

    • X1E series cards do not support cbs cbs-value.

Configuration Tips

Deleting the configuration of Outbound Interface-based Rate Limiting

Run the undo qos lr [ outbound ] command in the interface view to delete the configuration of outbound interface-based rate limiting.

Updated: 2019-12-28

Document ID: EDOC1000142089

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