METHOD OF SWITCHING RETRIEVAL TABLE AT HIGH SPEED AND PACKET TRANSFER APPARATUS

PROBLEM TO BE SOLVED: To enable to switch an output line to a line for a detour and to switch output header information of a packet to header information for the detour, when a trouble occurs on the line which a router in an IP and MPLS networks accommodates. SOLUTION: In a packet transfer apparatus that accommodates two output lines, there are provided: a means for storing output information of each plurality of input header information; a means for storing output information of an output line to be a detour at the time of a trouble that corresponds to input header information; and an output information address rewriting processing portion that writes an address of output information corresponding to the output line to be the detour at the time of trouble of the output line. COPYRIGHT: (C)2010,JPO&INPIT