Protected and high availability paths using DBR reroute paths

Details Protected and high availability paths using DBR reroute paths Protected and high availability paths using DBR reroute paths

2011-01-18

2011-01-18

Mattis, Jason E (Department: 2461)

Multiplex communications

Fault recovery

Bypass an inoperative channel

C370S228000, C370S395210

Reexamination Certificate

active

07872966

ABSTRACT:
A method and apparatus are provided for protecting a connection during implementation of an Active Connection Modify request. Before initiating the ACM request, an alternate connection between the source node and the destination node of the connection are established using Domain-Based Rerouting. The alternate connection may be established in conformance either with the traffic parameters of the existing connection or with the new traffic parameters specified in the ACM request. If the connection along the original connection is to be torn as a result of lost ACM signaling messages, the connection is first switched to the alternate connection in a hitless manner. If the alternate connection is established in conformance with the new traffic parameters, and the ACM request can not be implemented along the original connection, due for example to resource shortage along the original connection, then the connection is switched to the alternate connection in a hitless manner. In this way, connections are protected in the event of lost ACM messages resulting from signal congestion, and the ACM may be implemented even in the event of resource shortage along the original connection.

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Modification of Traffic Parameters for an Active Connection . . . , ATM Forum Technical Committee, AF-CS-0148.001, May 2001.

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