Replay apparatus capable of preventing mistaken learning of MAC addresses learning table

摘要

A relay apparatus (1) includes a MAC (Media Access Control) address learning table (11) for recording transfer destinations for frames. The relay apparatus (1) is connected to other relay apparatuses to compose a network of a ring redundancy method. The relay apparatus (1) includes a port move detecting circuit (15) for detecting a port move which occurs in a case where a frame arrives from other than a path learned in the MAC address leaning table (11) on a path changing on ring redundancy.