Method and apparatus for performing an address lookup using a multi-bit trie with backtracking
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United States of America Patent
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Mar 4, 2008
Grant Date -
May 27, 2004
app pub date -
Nov 22, 2002
filing date -
Nov 22, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
One embodiment of the present invention provides a system that facilitates performing a fast address lookup within a packet forwarder to determine where to forward a packet. Upon receiving the packet at an input link of the packet forwarder, the system reads a destination address from the packet. The system uses this destination address to lookup a corresponding entry in a forwarding table that is organized as a multi-bit trie. If the corresponding entry does not identify the output link for the packet, the system backtracks through the multi-bit trie to locate an entry with a prefix that matches the destination address and that identifies the output link for the packet. Finally, the system forwards the packet to the identified output link.
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