Intel 480T User Manual page 144

C H A P T E R 8
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Quality of Service (QoS)
Table 36: Default Code Point-to-QoS Profile Mapping
Code Point QoS Profile
0-7 Qp1
8-15 Qp2
16-23 Qp3
24-31 Qp4
32-39 Qp5
40-47 Qp6
48-55 Qp7
56-63 Qp8
You can change the QoS profile assignment for all 64 code points.
To do this, use the following command:
config diffserv examination code-point <code_point>
qosprofile <qosprofile> ports [<portlist> | all]
Once assigned, the rest of the switches in the network prioritize the
packet using the characteristics specified by the QoS profile.
Overwriting DiffServ Code Points
The switch can be configured to change the DiffServ code point in
the packet prior to the packet being transmitted by the switch.
The DiffServ code point value used in overwriting a packet is
determined by the 802.1p priority value. As described in the section
"Overwriting 802.1p Priority Information," the 802.1p priority
value is determined by the hardware queue used when transmitting
a packet. It is not necessary to receive or transmit 802.1Q tagged
frames, only to understand that the egress hardware queue, which
also determines the 802.1p priority value, may also be configured to
determine the DiffServ value if you want to replace the DiffServ
code points.