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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 13

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.

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Priority Mapping

Priority Mapping

Priority mapping maps QoS priorities in packets to internal priorities (also called local priority, which is used by the device to differentiate Class of Service (CoS) values of packets) to ensure QoS in the differentiated services (DiffServ) model based on internal priorities.

Different QoS precedence fields are used on different networks according to the network plan. For example, packets carry the 802.1p field in a VLAN and the DSCP field on an IP network. The mapping between the priority fields must be configured on the network devices to retain priorities of packets when the packets traverse different networks. When the device functions as the gateway between different networks, the external priority fields (including 802.1p and DSCP) of all packets received by the device are mapped to the internal priorities. When the device sends packets, it maps the internal priorities to external priorities.

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Updated: 2019-12-13

Document ID: EDOC1000041694

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