| 摘要 |
In a method of establishing communication over a network a number of nodes are interconnected in a ring architecture. Virtual connections are set up on a pair of counter-rotating packet-based rings to interconnect the nodes. At each node packets destined for that node are extracted from the rings, outgoing packets are added to the rings, and packets on each ring not destined for that each node pass directly through. This arrangement establishes a virtual mesh structure between the nodes. Either each node transmits packets on both rings or receives packets from both rings. In the case where each node transmits packets on both rings the node selects one of the rings from which to receive packets in the absence of a fault, selects the fault-free ring from which to receive packets if only one of the rings has a fault, and selects both rings from which to receive packets if both rings have faults. In the case where each node receives packets from both rings the node selects one of the rings on which to transmit packets dependent on the destination of the transmitted packets in the absence of a fault, and in the presence of a fault the node alters its transmitting behavior to broadcast packets on both rings.
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