The value of tmnxVrrpLagNumberDownEventType specifies whether
this event is a 'delta' or an 'explicit' event. When the number
of LAG ports that are operationally down exceeds the threshold
defined by tmnxVrrpLagNumberDown, the value of
tmnxVrrpLagNumberDownEventPriority will be subtracted from the
in-use priority in case of a 'delta' event or the in-use priority
will be explicitly overridden by the value of
tmnxVrrpLagNumberDownEventPriority in case of an 'explicit'
event.