Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
2011-03-01
2011-03-01
Phan, Tri H (Department: 2471)
Multiplex communications
Fault recovery
Bypass an inoperative station
C370S258000, C370S405000, C370S406000
Reexamination Certificate
active
07898942
ABSTRACT:
In a multi-ring network with a plurality of rings to which RPR is applied connected, high-speed failure recovery is enabled when a failure occurs between the rings. The contact nodes700-1and700-3connected to the living inter-link505periodically transmit and receive a KeepAlive signal to/from each other. Then, when a KeepAlive signal fails to arrive for a fixed time period, determination is made that the inter-link505develops a fault to broadcast-transmit an inter-link failure notification RPR-MAC frame indicative of failure occurrence on the inter-link to each node. A contact node as a transmission source of the inter-link failure notification RPR-MAC frame and each node having received the inter-link failure notification RPR-MAC frame immediately flush learning contents of their own learning data bases. A contact node connected to the spare inter-link506switches the spare inter-link506to a forwarding state.
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Ogasahara Daisaku
Sakauchi Masahiro
Takagi Kazuo
NEC Corporation
Phan Tri H
Scully , Scott, Murphy & Presser, P.C.
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