Patent ID: 7031319
Filing Date: 2006-04-18
Classification: H04L

Abstract:
1. An ATM switching system to be connected to a network comprising at least two CPUs operable in state of currently acting (ACT), subsidiary acting (SBY), on-line or off-line, and an emergency action unit (EMA) for controlling the operations of CPUs, wherein the CPU includes steps of: judging whether the CPU is in the state of on-line or off-line on the basis of system data provided from the emergency action unit and including at least currently acting (ACT), subsidiary acting (SBY), on-line and off-line; judging whether the CPU is in the state of currently acting or subsidiary acting; retrieving a predetermined representative MAC/IP address from a MAC/IP address managing table including MAC/IP addresses to be set and setting the retrieved representative MAC/IP address when the CPU is in the state of currently acting and on-line; retrieving an own MAC/IP address from the MAC/IP address managing table and setting the retrieved own MAC/IP address when the representative MAC/IP address has not been retrieved; stopping a service to the network when the CPU is in the state of subsidiary acting; and retrieving the own MAC/IP from the MAC/IP address managing table and setting the retrieved own MAC/IP address when the CPU is in the state of off-line, and starting the service to the network.