Extreme Networks ExtremeWare XOS 11.3, Manual

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Traffic Groupings
ExtremeWare XOS 11.3 Concepts Guide
299
Replacing 802.1p priority information. By default, 802.1p priority information is not replaced or
manipulated, and the information observed on ingress is preserved when transmitting the packet. This
behavior is not affected by the switching or routing configuration of the switch.
NOTE
In the BlackDiamond 8800 family of switches and the Summit X450 switch, 802.1p replacement uses existing flow
classifiers. If this feature is enabled and the flow classifier has been defined (traffic groupings), the related flow
classifier causes the replacement.
However, the switch is capable of inserting and/or overwriting 802.1p priority information when it
transmits an 802.1Q tagged frame. If 802.1p replacement is enabled, the 802.1p priority information that
is transmitted is determined by the queue that is used when transmitting the packet. The 802.1p
replacement configuration is based on the ingress port. To replace 802.1p priority information, use the
following command:
enable dot1p replacement ports [<port_list> | all]
NOTE
The port in this command is the ingress port.
To disable this feature, use the following command:
disable dot1p replacement ports [<port_list> | all]
NOTE
On the BlackDiamond 8800 family of switches and the Summit X450 switch, only QP1 and QP8 exist by default;
you must create QP2 to QP7. If you have not created these QPs, the replacement feature will not take effect.
The 802.1p priority information is replaced according to the queue that is used when transmitting from
the switch. The mapping is described in
Table 44 . This mapping cannot be changed.
NOTE
This command affects only that traffic based on explicit packet class of service information and physical/logical
configuration.
Table 44: Queue-to-802.1p priority replacement value
802.1p priority
replacement value BlackDiamond 10K switch
hardware queue BlackDiamond 8800 family of switches and
Summit X450 switch 802.1p queue
0 Q0 Q1
1 Q1 Q2
2 Q2 Q3
3 Q3 Q4
4 Q4 Q5
5 Q5 Q6
6 Q6 Q7
7 Q7 Q8