HP-UX IPQoS A.01.00 Programmer's Guide (October 2005)

Using the HP-UX IPQoS API
Filter Objects
Chapter 230
Filter Objects
Filter objects define classes of traffic based on a combination of one or more attributes. IP
traffic that matches the class of traffic defined by a filter gets processed by the policy that the
filter is attached to. A filter can only be attached to multiple policies, but can only be attached
to one policy per adapter. A filter is effectively ignored if it is not attached to any policy.
Filter-related functions in the HP-UX IPQoS API allow programmers to create filters, assign
(“set”) and access (“get”) values of their attributes, and associate filters with policies.
Table 2-1 lists the attributes associated with filter objects.
Filter Overlap
A filter is said to overlap another filter if:
— both filters are associated with the same adapter
— the priority attribute of the filter is of equal or greater priority than the other
— the filter defines a set of traffic that is a superset of the traffic defined by the other filter
(complete overlap), or has an intersection with the traffic defined by the other filter
(partial overlap)
Table 2-1 Attributes Associated with Filter Objects
Object Type Attributes
Filter unique name
source addresses
destination addresses
source port numbers
destination port numbers
network protocol number (0x800 or 0x86DD)
transport protocol number (tcp or udp)
destination physical address
DSCP(s)
priority
status