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S12700 V200R013C00 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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(Optional) Configuring CFI as the Internal Drop Priority

(Optional) Configuring CFI as the Internal Drop Priority


The Canonical Format Indicator (CFI) in the VLAN tag, also called Drop Eligible Indicator (DEI), identifies the drop priority of packets in certain situations. When the rate of packets on certain devices exceeds the committed information rate (CIR) value, the value of the DEI field is set to 1. In this case, the drop priority of the packets is high. When congestion occurs, the devices first discard the packets whose DEI field is 1.

If packets whose rate exceeds the CIR need to be discarded, configure CFI as the internal drop priority.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run dei enable

    CFI is configured as the internal drop priority.

    By default, CFI is not configured as the internal drop priority.

Updated: 2019-04-08

Document ID: EDOC1100065653

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