Redundant packet switching system and system switching...

Details Redundant packet switching system and system switching... Redundant packet switching system and system switching...

2011-08-23

2011-08-23

Pham, Chi H (Department: 2471)

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

C370S221000

Reexamination Certificate

active

08004965

ABSTRACT:
From a time point of last confirmation of operation of the working device51until a time point of next confirmation, the standby device52receives the same packet as that whose transfer processing is executed by the working device from the interface units521-1˜521-n, processes the packet by the transfer unit522and holds the processed packet in the accumulation units525-1˜525-n. The device monitors an operation state of the working device51by an advertisement transmitted by the working device51and upon reception of the advertisement, responsively abandons the packet held in the accumulation units525-1˜525-n. When determining that the working device51stops by non-arrival of an advertisement for a predetermined time period, the device sends out the packet held in the accumulation units525-1˜525-nand switches processing so as to itself operate as a working device.

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