For a classifier used by the Diffserv Rules table. Enables
specification of a classifier that should apply to outbound
traffic on all Diffserv boundary ports or all Diffserv Interior
ports.
If normal is specified, the rlPolicyClassifierOutIfIndex field
is used as it is in the non-diffserv case. If allBoundary or
allInterior is selected, rlPolicyClassifierOutIfIndex is ignored