3Com 4500 Configuration Manual page 428

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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 EF class;

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

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)

DSCP value (binary)

be (default)

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