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Configuration Guide - QoS

CloudEngine 12800 and 12800E V200R003C00

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

Context

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

Either of the following priorities can be trusted on an interface:
  • 802.1p priority

    The device classifies packets based on 802.1p priorities and performs priority mapping accordingly. 802.1p priorities are trusted on a Layer 2 network by default.

  • DSCP priority

    The device classifies packets based on DSCP priorities and performs priority mapping accordingly. DSCP priorities are trusted on a Layer 3 network by default.

NOTE:
  • MPLS EXP is trusted on an MPLS network and cannot be changed.
  • If an Ethernet interface is switched to Layer 3 mode using the undo portswitch command, this interface trusts DSCP priorities by default.

  • By default, an inbound interface trusts 802.1p priorities of multicast packets that are forwarded based on MAC addresses, and trusts DSCP priorities of multicast packets that are forwarded based on IP addresses.

  • The source interface of a GRE tunnel cannot be configured to trust 802.1p priorities.

Procedure

  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 | dscp }

    The priority for packet mapping is specified.

    By default, 802.1p priorities are trusted on a Layer 2 network and DSCP priorities are trusted on a Layer 3 network.

  4. 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.

  5. Run commit

    The configuration is committed.

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Updated: 2019-05-05

Document ID: EDOC1100004202

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