An index component that identifies the filter instance within a specific policy (as identified by the ntnQosFilterStatsPolicyId attribute) that is associated with this Filter Statistics entry. If the identified policy references an individual classifier (as specified by the QoS Policy Table ntnQosPolicyClassifierType attribute), the value of this attribute will be the referenced classifier component set ID. If a block of classifiers is specified, the value of this attribute will be the classifier component set identifier referenced by the block member. A special value (0) for this attribute indicates that aggregate, not individual, statistics are being maintained for the referenced policy. In this case, the filter ID of 0 should be thought of as a wildcard identifying all the classifiers associated with the policy.