Patent ID: 8203935

Claim:
A signal transmitting device comprising: an ingress interface unit to determine an output port based on a destination MAC address of an input frame, to add destination information including information of the determined output port to the frame, and to output the frame added to the destination information; two or more egress interface units to include the output port of the frame; a Layer 2 switch unit to connect to the ingress interface unit and to the two or more egress interface units, to receive the frame including the destination information output from the ingress interface unit, to determine a forwarding destination of the frame based on the destination information included in the frame, and to forward the frame to at least one, as the determined forwarding destination, of the two or more egress interface units; and a notifying unit to notify of, when a fault related to the output port occurs, alternative destination information including information of an alternative output port which is a standby port corresponding to at least the output port; wherein the Layer 2 switch unit includes, a storage unit; a registration unit to receive the alternative destination information from the notifying unit and to register the alternative destination information in the storage unit in a way that associates the alternative destination information with the destination information; and a translation unit to rewrite, when the storage unit is registered with the alternative destination information associated with the destination information in the frame input to the Layer 2 switch unit, the destination information in the frame into the alternative destination information so that the Layer 2 switch unit determines a forwarding destination of the frame based on the alternative destination information.