Altering a MAC multicast address in the forwarding tables of a LAN-switch after a handover between 2 access points belonging to the same LAN

摘要

A communication system (100) includes a relay apparatus (AP) which offers an access link to a mobile terminal, a layer 2 switch (3) which relays data between the relay apparatus and a router on a next hop from a communication destination terminal of the mobile terminal (MN) and a route information notification unit. The route information notification unit notifies to the relay apparatus (AP) and the layer 2 switch (3) in a subnet where the mobile terminal (MN) is present, route information including a data link layer unicast address of a packet addressed to the mobile terminal (MN), and a data link layer multicast address thereof in a case where the mobile terminal (MN) is activated and in a case where the mobile terminal (MN) switches a connection.