This RowPointer indicates the diffServMinRateEntry that the
scheduler, pointed to by diffServQNext, should use to service
this queue.
If the row pointed to is zeroDotZero, the minimum rate and
priority is unspecified.
Setting this to point to a target that does not exist results in
an inconsistentValue error. If the row pointed to is removed or
becomes inactive by other means, the treatment is as if this
attribute contains a value of zeroDotZero.