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CLI-based Configuration Guide - QoS

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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Overview of Priority Mapping

Overview of Priority Mapping

Priority mapping is a method of translating Quality of service (QoS) precedence fields carried in packets into internal priorities on a device (also called local priorities, which are used to differentiate classes of service for packets). After priority mapping, the device provides differentiated services for packets based on the internal priorities.

Packets transmitted over different networks carry different QoS precedence fields, for example, 802.1p field on a virtual local area network (VLAN), EXP field on a Multiprotocol Label Switching (MPLS) network, and DSCP field on an IP network. Priority mapping must be configured on network devices to retain priorities of packets when the packets traverse different networks. When a device connects different types of networks, it maps external precedence fields (including 802.1p, MPLS EXP, and DSCP) of all the received packets to internal priorities. When the device sends packets, it maps internal priorities to external priorities.

Updated: 2019-05-17

Document ID: EDOC1000174115

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