HP A8800 Series Command Reference Manual page 85

An SPE card uses the 802.1p priority of Layer 2 packets, the IP precedence of Layer 3 packets, and
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the EXP of MPLS packets for priority mapping.
An SPC card uses the IP precedence of IP packets, EXP of MPLS packets, and 802.1p priority of any
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other non-IP packet for priority mapping.
Description
Use qos trust auto to configure an interface to use a particular priority field in the incoming packet for
priority mapping.
Use undo qos trust to restore the default priority trust mode.
When a packet arrives on an interface, the router assigns a set of parameters (including 802.1p priority,
DSCP precedence, local precedence, and drop precedence) to the packet as configured.
A local precedence is locally significant and corresponds to an output queue.
A drop precedence is used for packet drop. The value 2 corresponds to red packets, the value 1
corresponds to yellow packets, and the value 0 corresponds to green packets.
Settings in interface view take effect on the current interface. Settings in port group view take effect on all
ports in the port group. Settings in subinterface view take effect on the current subinterface.
In respect to subinterfaces, only the subinterfaces on SPE cards support the qos trust auto command.
Examples
# Specify auto priority trust mode for GigabitEthernet 2/1/1.
<Sysname> system-view
[Sysname] interface GigabitEthernet 2/1/1
[Sysname-GigabitEthernet2/1/1] qos trust auto
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