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Configuration Guide - QoS

CloudEngine 8800, 7800, 6800, and 5800 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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Configuring Priority Mapping

Configuring Priority Mapping

After you configure priority mapping, the device maps packet priorities or the default interface priority to PHBs and colors to provide differentiated services for packets.

Configuration Roadmap

The configuration roadmap is as follows:

  1. Specify the packet priority trusted by an interface so that priority mapping is performed according to the trusted priority.
  2. Configure a DiffServ domain to determine the mappings between packet priorities and internal priorities (CoS values). This allows the device to provide differentiated services according to internal priorities.
  3. Apply the DiffServ domain to an object so that the mappings take effect. The device can then re-mark priorities of packets according to the mappings.
  4. (Optional) Configure mappings from internal priorities to queue indexes to schedule packets with different internal priorities in different queues. This step is optional because the device provides default mappings from internal priorities to queue indexes.

Pre-configuration Tasks

Before configuring priority mapping, complete the following tasks:

  • Set physical parameters for relevant interfaces.
  • Set the link-layer attributes for relevant interfaces.
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Updated: 2019-03-21

Document ID: EDOC1000166640

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