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S12700 V200R012C00 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 Inbound Interface-based Rate Limiting

Configuring Inbound Interface-based Rate Limiting


If rates of traffic sent from users are not limited, continuous burst data from many users congests the network. Inbound interface-based rate limiting controls the rate of traffic entering an interface within a specified range.


  1. Run system-view

    The system view is displayed.

  2. (Optional) Run qos-car exclude-interframe

    The system is configured not to count the inter-frame gap and preamble of packets when calculating inbound interface-based rate limiting.

    By default, the system counts the inter-frame gap and preamble of packets when calculating the traffic rate for inbound interface-based rate limiting.

  3. Run qos car car-name cir cir-value [ cbs cbs-value [ pbs pbs-value ] | pir pir-value [ cbs cbs-value pbs pbs-value ] ]

    A QoS CAR profile is created, and rate limiting parameters are configured in the profile.

  4. Run interface interface-type interface-number

    The interface view is displayed.

  5. Run qos car inbound car-name

    The QoS CAR profile is applied to the interface.

    After a CAR profile is applied to an interface, the device limits the rate of all traffic entering the interface.

    If a QoS CAR profile is applied to a VLAN to police incoming broadcast traffic, multicast traffic, or unknown unicast traffic (see the broadcast-suppression (VLAN view), multicast-suppression (VLAN view), or unicast-suppression (VLAN view) command) and a QoS CAR profile is applied to an interface that allows this VLAN, traffic suppression and rate limiting take effect in sequence on X series cards, but only QoS CAR parameters take effect on other cards.

Configuration Tips

Deleting the Configuration of Inbound Interface-based Rate Limiting

Unbind the QoS CAR profile qoscar1 from GE1/0/1 and delete the profile.

[HUAWEI] interface gigabitethernet 1/0/1
[HUAWEI-GigabitEthernet1/0/1] undo qos car inbound
[HUAWEI-GigabitEthernet1/0/1] quit
[HUAWEI] undo qos car qoscar1
Updated: 2019-01-18

Document ID: EDOC1100038410

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