Route lookup engine
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United States of America Patent
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Mar 23, 2004
Grant Date -
N/A
app pub date -
Dec 13, 1999
filing date -
Dec 13, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A Route Lookup Engine (RLE) for determining a next hop index is disclosed. The RLE receives a lookup key and performs a multi-bit trie search with prefix expansion and capture of a variable stride trie. The data that the RLE returns comprises the next hop information and status flags. The RLE uses a compact, field reusable data structure. The RLE performs both unicast and multicast IP address lookups on Virtual Private Networks. The RLE uses separate indexing and forwarding memories. The upper bound of the search time for the RLE is fixed regardless of the route table size.
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