H3C S5100-SI Series Operation Manual page 450

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IP precedence value

In a Diff-Serv network, traffic is grouped into the following four classes, and packets are

processed according to their DSCP values.

Expedited Forwarding (EF) class: In this class, packets are forwarded regardless

of link share of other traffic. The class is suitable for preferential services with low

delay, low packet loss ratio, low jitter, and assured bandwidth (such as the virtual

leased line service).

Assured Forwarding (AF) class: This class is divided into four subclasses (AF1 to

AF4), each containing three drop priorities for more granular classification. The

QoS level of the AF class is lower than that of the EF class.

Class Selector (CS) class: This class is derived from the IP ToS field and includes

eight subclasses.

Best Effort (BE) class: This class is a special CS class that does not provide any

assurance. AF traffic exceeding the limit is degraded to the BE class. Currently, all

IP network traffic belongs to this class by default.

Table 1-3 Description on DSCP values

DSCP value (decimal)

IP precedence value

DSCP value (binary)

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