HP ProCurve 5300xl Series Management Manual page 346

Quality of Service (QoS): Managing Bandwidth More Effectively
QoS Operating Notes and Restrictions
8-72
All Switches—Not Supported: Use of an inbound 802.1p packet priority
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as a classifier for remapping a packet's outbound priority to different
802.1p priority. For example, where inbound packets carry an 802.1p
priority of 1, QoS cannot be configured use this priority as a classifier for
changing the outbound priority to 0.