The delay between the transmission of NCDP configuration
PDUs.
The hold time is used to limit the transmission of NCDP
configuration PDUs out of an interface to a maximum of one
configuration PDU per hold time interval per interface.
The value of this object should normally be set to match the
value of cncNcdpMessageInterval. If the value of this
object is higher than the value of cncNcdpMessageInterval,
NCDP configuration PDUs will end up being propagated at
the rate specified by the value of this object instead.
This object is only used by the NCDP protocol entity.