Selects the next data path component, which can be another scheduler or other TC elements. One usage of multiple scheduler elements in series is for Class Base Queueing (CBQ).

The value zeroDotZero in this variable indicates no further DiffServ treatment is performed on this flow by the current interface for this interface direction. For example, for an inbound interface the value zeroDotZero indicates that the packet flow has now completed inbound DiffServ treatment and should be forwarded on to the appropriate outbound interface. If the row pointed to does not exist, the scheduler element is considered inactive.