The value of tmnxVrrpLagNumberDownEventPriority specifies
the priority level associated with this event. When the number
of LAG ports that are operationally down exceeds the threshold
defined by tmnxVrrpLagNumberDown, this priority 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).