3Com Baseline 2928 PWR Plus User Manual page 465

Baseline switch 2900 family

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

other traffic. The class is suitable for preferential services requiring low delay, low packet loss, low

jitter, and high bandwidth.

Assured forwarding (AF) class: This class is divided into four subclasses (AF 1 to AF 4), 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 2-2 Description on DSCP values

DSCP value (decimal)

802.1p precedence

802.1p precedence lies in Layer 2 packet headers and is applicable to occasions where Layer 3 header

analysis is not needed and QoS must be assured at Layer 2.

DSCP value (binary)

be (default)

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