Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
2005-10-04
2005-10-04
Ton, Dang (Department: 2666)
Multiplex communications
Fault recovery
Bypass an inoperative station
C370S238000, C370S255000, C370S352000, C370S353000, C455S445000, C714S004110
Reexamination Certificate
active
06952396
ABSTRACT:
A control system enables transport of payload data across a dual counter rotating ring (DCRR) network having two or more nodes, each node providing access to the DCRR network by a respective local area network (LAN) subtending the node. The control system comprises a topology learning entity operative within each node for monitoring individual, links of the DCRR, discovering the active topology of the DCRR, communicating topology changes to other nodes in the DCRR, and informing frame forwarding and learning processes of the topology to enable failover to redundant resource upon detection of a network component failure. A frame forwarding process selects a shortest path route between a source and a destination node in the DCRR, and forwards frames to the destination node via the selected shortest path route. An address learning process inspects a source medium access control (MAC) address in each received frame to learn a shortest path route for each MAC address.
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Cobbold Mark
Cottreau Peter Martin Kenneth
Delaney David MacDonald
Hurren Alan
Peng Wang-Hsin
Mehra Inder Pal
Nortel Networks Limited
Ogilvy Renault LLP
Ton Dang
Wood Max R.
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