The value of tmnxVrrpRouteUnknownEventPriority specifies the priority level associated with this event. When the operational state of the event transitions to one of the 'set' states, this value will either be subtracted from the in-use priority (if the event is a 'delta' event) or the in-use priority will be explicitly overridden by this priority value (if the event is an 'explicit' event).