The classifier element table enumerates the relationship between classification patterns and subsequent downstream Differentiated Services Functional Data Path elements. diffServClfrElementSpecific points to a filter that specifies the classification parameters. A classifier may use filter tables of different types together.

One example of a filter table defined in this MIB is diffServMultiFieldClfrTable, for IP Multi-Field Classifiers (MFCs). Such an entry might identify anything from a single micro-flow (an identifiable sub-session packet stream directed from one sending transport to the receiving transport or transports), or aggregates of those such as the traffic from a host, traffic for an application, or traffic between two hosts using an application and a given DSCP. The standard Behavior Aggregate used in the Differentiated Services Architecture is encoded as a degenerate case of such an aggregate - the traffic using a particular DSCP value.

Filter tables for other filter types may be defined elsewhere.