Using the HP-UX IPQoS API
Filter Objects
A completely overlapping (superset) filter prevents any traffic from matching the other filter and effectively renders the other filter completely ineffective. A partial overlap (intersection) renders the other function partially ineffective. An HP-UX IPQoS configuration with overlapping filters is not recommended. Filters should be redefined to avoid having complete or partial overlap conditions.
The HP-UX IPQoS API has a function IpqosCheckFilterOverlap() to assist with checking for these cases. Refer to the IpqosOverlapFilter (3c) manpage for more detailed information on how to check for overlapping filters.
