H3C S7500 Series Operation Manual page 690

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Operation Manual – QoS

H3C S7500 Series Ethernet Switches

The precedence values of an IP packet represent 8 different service classes.

Table 1-1 Description on IP Precedence

IP Precedence (decimal)

The Diff-Serv network defines four traffic classes:

Expedited Forwarding (EF) class: In this class, packets can be forwarded

regardless of link sharing of the other traffic. The class is suitable for preferential

services with low delay, low packet loss ratio, low jitter and guaranteed bandwidth

(such as virtual leased line);

Assured forwarding (AF) class: This class is further divided into four sub-classes

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

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

that of the EF class traffic;

Class selector (CS) class: This class comes from the IP TOS field and includes 8

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

CS class. The AF class traffic can be degraded to the BE class traffic if it exceeds

the limit. Current IP network traffic is of the BE class by default.

Table 1-2 Description on DSCP precedence

IP Precedence (binary)

DSCP precedence

Chapter 1 QoS Configuration

flash-override

DSCP precedence

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