Application-transparent IP redundancy

Details Application-transparent IP redundancy Application-transparent IP redundancy

2008-01-29

2008-01-29

Shah, Chirag G. (Department: 2616)

Multiplex communications

Fault recovery

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

C370S392000, C370S395320, C370S219000, C370S351000

Reexamination Certificate

active

07324439

ABSTRACT:
The present invention is directed to a method, a service node and a system for providing IP redundancy between a first service node and a second service node being mutually redundant. The first and the second service nodes are connected via a virtual connection. The first service node has a physical network interface to an IP node and a virtual network interface to the virtual connection. The first service node comprises a routing table having a cost associated with the virtual network interface. The method comprises steps of detecting by the first service node that the second service node is unavailable, updating in the routing table the cost from a higher value to a lower value and informing the IP node connected to the physical network interface of the update of the cost so as to process at the first service node traffic addressed to the second service node.

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J. Moy, OSPF Version 2, Network Working Group, RFC 2328, Apr. 1998.
Internet Protocol, Darpa Internet Program, Protocol Specification, RFC 791, Sep. 1981.

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