PROBLEM TO BE SOLVED: To provide a method of executing router interface backup by VRRP ( Virtual Router Redundancy Protocol).;SOLUTION: In the method of executing the router interface protocol by VRRP, a plurality of interfaces for a router are connected to the same LAN, and the interfaces are added to the same multicast group, and the same virtual router No. and virtual IP address are set to the interfaces, and a main interface and a back up interface are selected according to the priority of the interfaces, and if the backup interface does not receive a VRRP multicast packet from the main interface within a specified period, the backup interface of 1 becomes the main interface.;COPYRIGHT: (C)2004,JPO
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