The network-wide priority of this clock source if
configured as a source of network clock for NCDP. The
highest priority clock source is that clock source having
the lowest positive numeric value. The clock source with
the highest priority is selected as the root of the clock
distribution tree by the NCDP algorithm. If more that one
clock source is configured with with the same priority the
NCDP algorithm uses the value cncNcdpStratum as a
tiebreaker.