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Chapter 5: Management
5.6.2 Port Classification
QoS is an acronym for Quality of Service. It is a method to achieve efficient bandwidth utilization between individual applications
or protocols.
Figure 5-58. QoS Ingres Port Classification screen.
Table 5-38. QoS Ingres Port Classification screen options.
Label Description
Port The port number for which the configuration below applies.
QoS Class Controls the default QoS class.
All frames are classified to a QoS class. There is a one to one mapping between QoS class, queue,
and priority. A QoS class of 0 (zero) has the lowest priority.
If the port is VLAN aware and the frame is tagged, then the frame is classified to a QoS class that is
based on the PCP value in the tag as shown below. Otherwise the frame is classified to the default
QoS class.
PCP value: 0 1 2 3 4 5 6 7
QoS class: 1 0 2 3 4 5 6 7
If the port is VLAN aware, the frame is tagged, and Tag Class is enabled, then the frame is classified
to a QoS class that is mapped from the PCP and DEI value in the tag. Otherwise the frame is classi-
fied to the default QoS class.
The classified QoS class can be overruled by a QCL entry.
NOTE: If the default QoS class has been dynamically changed, then the actual default QoS class is
shown in parentheses after the configured default QoS class.
DP level Controls the default Drop Precedence Level.
All frames are classified to a DP level.
If the port is VLAN aware and the frame is tagged, then the frame is classified to a DP level that is
equal to the DEI value in the tag. Otherwise the frame is classified to the default DP level.
If the port is VLAN aware, the frame is tagged, and Tag Class is enabled, then the frame is classified
to a DP level that is mapped from the PCP and DEI value in the tag. Otherwise the frame is classified
to the default DP level.
The classified DP level can be overruled by a QCL entry.