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For Trust COS port, to make classification according to 3-digit PRI in TAG information of data
frame, generate internal DSCP value according to COS-DSCP Mapping Table, and all data flow
can be classified into 8 kinds max. according to 3-digit PRI. Note: COS PRI is 0 instead of port
default PRI (PPD-COS) if there is no TAG information in data frame, COS PRI is the default PRI
of input port if data frame with information is sent out through output port.
For Trust IP_Precedence port, to make classification according to the highest 3-digit of TOS field
in IP data packet, generate internal DSCP value according to PREC-DSCP Mapping Table, and
all data flow can be classified into 8 kinds max. according to 3-digit IP_Precedence value.
For Trust DSCP port, to make classification according to the highest 6-digit of TOS field in IP
data packet, generate internal DSCP value according to DSCP-DSCP Mapping Table, and all
data flow can be classified into 64 kinds max. according to 6-digit DSCP value.
For QoS untrust port, classification is much complex based on one or more fields of data flow,
and more different data flows can be mapped into one class. iSpirit 3026 provides CLASS and
POLICY configuration mode to classify the data flow. In CLASS mode select those data flow to
group one class, and in POLICY mode map every class into one internal DSCP value. One
POLICY can include one or more CLASS. Please refer to Figure 12-4 that provide detail
description for classification flow.
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