Method and apparatus for providing a fault tolerant network inte

Details Method and apparatus for providing a fault tolerant network inte Method and apparatus for providing a fault tolerant network inte

1991-10-21

1998-06-30

Beausoliel, Jr., Robert W.

G06F 1300

Patent

active

057746400

ABSTRACT:
A fault tolerant network interface is achieved by providing primary and alternate network controllers, dual transceivers, dual cables and dual connectors. This fault tolerant interface is driven by a logical device driver which controls the physical device drivers for the primary and alternate network controllers. The logical device driver causes periodically polling messages to be sent between the primary and alternate network controllers to determine if a fault has occurred in either of these network controllers. Faults detected are logged and error recovery actions are provided according to the nature of the faults detected. If the primary network controller is found to be faulty, the secondary network controller will assume the physical address of the primary network controller and provides the services of the primary network controller while the primary network controller is effectively removed from the network.

REFERENCES:
patent: 4847837 (1989-07-01), Morales et al.
patent: 5016244 (1991-05-01), Massey, Jr. et al.
patent: 5091847 (1992-02-01), Herbermann
"ISO 84d International Organization for Standardization, 'Open System Interconnection-Basic Reference Model; ISO 7498, 1984" pp. 235-247.
"Streams Primer" pp. 1-1 to 1-3 Prentice Hall, publisher.
"A Highly Available Network File Server" USENIX-Writer '91, Dallas, TX pp. 199-205.
"Integrity S2: A Fault-Tolerant Unix Platform," by D. Jewett, Nov. 27, 1990, available from Tandem Computers, Inc.
"A Highly Available Network File Server" USENIX, 21-25 Jan. 1991, pp. 199-205, Bhide et al.

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