Relay system, relay apparatus, and relay method

A relay system comprising:

• a first relay apparatus connected to a node through a first line;
• and
• a second relay apparatus connected to the node through a second line,
• wherein
• the first line and the second line belong to the same link aggregation group,
• the first relay apparatus includes:
• a first storage unit for storing first relation information regarding a relationship between a destination address and an output port of the first relay apparatus, and
• a first control unit to notify, before relaying a received frame, the second relay apparatus of a source address included in the received frame in the absence of first relation information related to the source address in the first storage unit upon receiving the received frame via a port connected to the first line, and
• the second relay apparatus includes:
• a second storage unit for storing second relation information regarding a relationship between a destination address and an output port of the second relay apparatus, and
• a second control unit to store, in the second storage unit, second relation information regarding a relationship between the source address notified by the first relay apparatus and an output port connected to the second line.