Packet multicasting in a ring architecture
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United States of America Patent
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Dec 9, 2003
Grant Date -
N/A
app pub date -
Aug 6, 1999
filing date -
May 1, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention is based on a ring architecture wherein each chip in the multiplicity of chips is connected in a chain so that it can receive packets from the next previous chip in the chain and forward packets to the next following chip in the chain, whereby to form a ring. Before a packet is placed on the ring by a device it is provided with a `masking` field which identifies each of the other devices and the ports within any such device to which the packet must be sent in order to achieve a multicast. When a device in its turn receives such a packet it will examine the masking field to determine whether the field identifies that device. If so, the packet, which may be held in temporary storage, may be processed for forwarding from a port of that device. The device will strip from the masking field the identification of the respective device and transmit the packet with a thus modified masking field to the next device in turn. If a packet does not contain any indication of another device in the ring, the packet will not be transmitted and therefore will naturally terminate.
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