Patent ID: 6449250
Filing Date: 2002-09-10
Classification: H04L

Abstract:
A method for switching a plurality of central devices including N working central devices and one protection central device of a N+l redundancy structure provided on a LAN center, to the CATV transmission path side of which terminal devices are connected each through a cable modem, having router functions forming segments respectively at the sides of the LAN center and the CATV transmission path, and a working central device transmitting routing information of the segment on the CATV transmission path side to inform the LAN center segment of an existence of the segment on said transmission path side, so that the terminal devices are connected to appropriate networks via the LAN center, the method comprising the steps of:maintaining control information of the plurality of working central devices and the protection central device to be monitored; detecting failure of a working central device by regularly polling the N working central devices, switching the detected, failed working central device to the protection central device to connect the plurality of central devices to the CATV transmission path; transferring the maintained control information of the failed central device to the protection central device; and setting the protection central device to an active status according to the transferred control information.