When the rfc-compatibility option is set, the VRRP process creates a special VRRP interface. The system automatically assigns the VRRP virtual MAC address to this interface. When a new master interface is elected, the system uses the procedure that is described in RFC 3768 to have the new master take over the virtual MAC address.
The VRRP interface that is created by the VRRP process operates in a special pass-through mode. The pass-through mode allows the router to receive packets that are addressed to the well-known VRRP MAC address for a given VRID on the parent interface.
The system automatically generates a name for the VRRP interface by appending vrrpn (where n is an arbitrary number starting from 1) to the physical interface prefix, for example, dp0vrrp1.
The interface name is based on the highest existing interface; for a scenario in which you configure three groups (dp0vrrp1, dp0vrrp2, and dp0vrrp3), then delete dp0vrrp2 and create another group, the interface name for the new group is dp0vrrp4.
The VRRP interface remains on the system as long as the rfc-compatibility option is set, and remains on the system independent of the state of the VRRP instance (backup or master).