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Configuration Guide - QoS
CloudEngine 12800 and 12800E 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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Specifying the Packet Priority Trusted on an Interface

Specifying the Packet Priority Trusted on an Interface


The priority trusted on an interface determines the type of priority to be mapped for packets on the interface.

By default, an interface trusts the default 802.1p priority. After packets arrive at an interface:
  • In Layer 2 forwarding mode

    If packets carry tags, the interface trusts the 802.1p priority. If packets carry no tag, the interface forwards them based on the interface priority.

  • In Layer 3 forwarding mode

    Configure the interface to trust DSCP priorities.


If an Ethernet interface is switched to Layer 3 mode using the undo portswitch command, this interface trusts DSCP priorities by default. When working in Layer 3 mode, the interface cannot be configured to trust other priorities.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. Run trust { 8021p { inner | outer } | dscp }

    The priority for packet mapping is specified.

    By default, an interface trusts 802.1p priorities in outer VLAN tags.

  4. Run commit

    The configuration is committed.

Updated: 2019-03-21

Document ID: EDOC1000166605

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