Alcatel-Lucent 7450 Configuration Manual page 358

VRRP Priority Control Policy Priority Events
When a route prefix exists within the active route table that matches the defined match criteria, the
route unknown priority event is considered false or cleared. When a route prefix does not exist
within the active route table matching the defined criteria, the route unknown priority event is
considered true or set.
Page 358 7450 ESS Router Configuration Guide