Dell PowerEdge M420 Reference Manual page 636

User Guidelines
If the interface is specified, the 802.1p mapping table of the interface is
displayed. If omitted, the most recent global configuration settings are
displayed.
Example
The following example displays the dot1p traffic class mapping and user
priorities.
console#show classofservice dot1p-mapping
User Priority
-------------
0
1
2
3
4
5
6
7
The following table lists the parameters in the example and gives a
description of each.
Parameter
User Priority
Traffic Class
636
QoS Commands
Traffic Class
---------------
1
1
6
4
3
4
5
6
Description
The 802.1p user priority value.
The traffic class internal queue identifier to which
the user priority value is mapped.