Rules specify which policies to assign to each subscriber and flow, based on the profiles in the rule.

There are independent sets of rules for each policy type: subscriber flow rules select the appropriate subscriber flow policy for each flow, subscriber rate rules select the appropriate subscriber rate policy for each subscriber, and, similarly, subscriber monitoring rules select the appropriate subscriber monitoring policy for each subscriber.

A rule can use one profile of each type (or, alternatively, use the any option, if the profile type is indifferent), and it defines one and only one policy to apply.

Every set of rules may have many rules, but only the one with the best match will be selected for each flow or subscriber. To evaluate the rules in a way that maximizes performance, profiles are checked in order. This predefined order determines which rule is finally selected.  A tree view of the rules helps in identifying which rule is selected in each case. See Decision Tree sections for details on the trees and the profile evaluation order.

Manually configured rule priorities are not used because of the performance penalties they entail and the burden on the operator to keep priorities consistent.

The subscriber flow rules are configured in the menu option Configuration-> Subscriber Flows, selecting the tab RULES TREE-VIEW or RULES TABLE-VIEW. Similarly, the subscriber rate rules are configurable in Configuration->Subscriber Rates and the subscriber monitoring rules in Configuration->Subscriber Monitoring.

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