Method and system for identifying ports and forwarding packets in a multiport switch
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United States of America Patent
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Dec 7, 1999
Grant Date -
N/A
app pub date -
Apr 17, 1998
filing date -
Apr 17, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for routing packets through a multiport switch involves attaching indicators to packets before the packets are passed through a switch fabric, and then using the indicators to look-up output port vectors after the packets have been passed through the switch fabric. In a preferred embodiment of a 64.times.64 port switch, an 8-bit output channel vector and a 15-bit output port index are attached to a packet and passed through the switch fabric. The 8-bit output channel vector directs the packet to the proper output packet processor(s) and the 15-bit output port index is used to look-up an output port vector that identifies the output port(s) that will receive the packet. The method and system provide low packet overhead and flexible scaling.
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