VRRP official article
interface (string; Default: ) - interface name on which VRRP instance will be running run.
vrid (integer: 1..255; Default: 1) - Virtual Router identifier. Each Virtual router must have unique id number.
priority (integer: 1..254; Default: 100) - priority of VRRP node used in Master election algorithm . '255' is reserved to Router that owns IP and '0' is reserved for Master router to indicate that it is releasing responsibility.
interval (string; Default: 1) - VRRP update interval in seconds. Defines how often master sends advertisement packets .