Patent ID: 8462652
Filing Date: 2013-06-11
Classification: G06F,H04L

Abstract:
1. A transmission device in which hardware installed in each of a pair of line cards having a redundant configuration by accommodating plural ports acquires for each port each piece of fault information of a currently-used line and an auxiliary line having a redundant line, a CPU incorporated in each line card having the redundant configuration determines for each port switchover control of the redundant line based on the fault information acquired, and the hardware performs for each port switchover of the redundant line and transmits an optical signal of an SDH/SONET system by a ring network, based on a switchover control determination by the CPU, the transmission device comprising: a master/slave CPU-distribution setting unit that sets a CPU incorporated in each line card having the redundant configuration as a master CPU that determines switchover control of the redundant line in distribution for each port, and sets as a slave CPU of a predetermined port a CPU incorporated in a line card at the opposite side of the line card in which the CPU incorporated as the master CPU of the predetermined port is set; a CPU-load-status measuring unit that measures a load status of a CPU incorporated in each line card having the redundant configuration; a CPU-load-rank-information managing unit that manages CPU-load rank information having a CPU load rank set in advance to each hierarchy having a CPU load factor that indicates a load status of the CPU segmented in a predetermined numerical range, the CPU load rank having a higher numerical value when the CPU load factor is higher; and a master/slave CPU-setting changing unit that determines a CPU load rank according to a CPU load factor of a CPU incorporated in each line card having the redundant configuration based on the CPU-load rank information managed by the CPU-load rank-information managing unit, compares between the determined CPU load ranks, and changes a setting of a CPU such that a CPU of a low CPU load rank is set more as a master CPU when there is a difference between CPU load ranks.