HP ProCurve 5300xl Series Management Manual page 340

Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
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2. Change the classifier configurations by assigning them to a different DSCP
policy, or to an 802.1p priority, or to No-override.
3. Reconfigure the desired priority for the 000001 codepoint.
4. Either reassign the classifiers to the 00001 codepoint policy or leave them
as they were after step 2, above.
Example of Changing the Priority Setting on a Policy When
One or More Classifiers Are Currently Using the Policy
Suppose that codepoint 000001 is in use by one or more classifiers. If you try
to change its priority, you see a result similar to the following:
Figure 8-37. Example of Trying To Change the Priority on a Policy In Use by a
Classifier
In this case, you would use steps similar to the following to change the priority.
1. Identify which classifiers use the codepoint you want to change.