iES12G
User’s
Manual
UM-iES12G-1.72.2-EN.docx
Pages 79 of 166
© 2020 IS5 COMMUNICATIONS INC. ALL RIGHTS RESERVED
Figure 77 - QoS Ingress Port Classification
Label
Description
Port
The port number for which the configuration below applies
QoS Class
Controls the default QoS class
Every incoming frame is 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 classified to the default QoS class. [1]
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 (DP) 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 (QoS Control List) QCL entry.
PCP
Controls the default PCP value.
is an acronym for Priority Code Point. It is a 3-bit
field storing the priority level for the 802.1Q frame. It is also known as
All frames are classified to a PCP value.
If the port is VLAN aware and the frame is tagged, then the frame is classified to the
PCP value in the tag. Otherwise the frame is classified to the default PCP value.