HP-UX IPQoS Configuration Files

Filter Blocks

pri[ority] p

Priority. Valid range is 1 to 2147483647, inclusive.

Use the priority filter attribute to assign relative importance to filters. The lower the number the higher the priority. Hence, the highest priority is 1.

The priority attribute is only relevant in cases where a packet matches a traffic class in more than one filter. In such cases, the policy applied to the packet is determined by the policy using the filter with the highest priority. If the priorities are the same, then the policy selected is undetermined.

If a packet can match the traffic class specified by more than one filter, assign relatively higher priorities (lower numeric values) to more restrictive filters and lower priorities to less restrictive filters. See “Example 3: Packets Can Match Multiple Filters” on page 122 in Appendix B, “HP-UX IPQoS Configuration File Examples,” for a case that illustrates the importance of the priority assignment.

If the priority is higher on a less restrictive filter, a warning message is generated. Because the filter with the lower priority would never be matched, it is not a meaningful filter. In intersection cases where filters overlap in some attributes, but not all, the presence of intersecting overlap also generates warning messages on problematic filters.

For all filters where no priority is specified, HP-UX IPQoS assigns an equal lowest possible priority.

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Chapter 4