H3C S5600 SERIES Operation Manual page 706

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IP Precedence (decimal)

In a network providing differentiated services, traffics are grouped into the following four

classes, and packets are processed according to their DSCP values.

Expedited Forwarding (EF) class: In this class, packets can be 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 virtual leased line);

Assured forwarding (AF) class: This class is further divided into four subclasses

(AF1/2/3/4) and a subclass is further divided into three drop priorities, so the AF

service level can be segmented. The QoS rank of the AF class is lower than that of the

Class selector (CS) class: This class comes from the IP ToS field and includes eight

Best Effort (BE) class: This class is a special class without any assurance in the CS

class. The AF class can be degraded to the BE class if it exceeds the limit. Current IP

network traffic belongs to this class by default.

Table 1-3 Description on DSCP precedence values

DSCP value (decimal)

IP Precedence (binary)

DSCP value (binary)

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