Exact match lookup with variable key sizes
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United States of America Patent
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Oct 23, 2018
Grant Date -
Oct 16, 2014
app pub date -
Apr 11, 2014
filing date -
Apr 11, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
In a method for populating an exact match lookup table in a network device, a lookup key to be stored in a database of the network device is determined. The database is distributed among two or more memory banks. At least based on a size of the lookup key, (i) a first memory bank from among the two or more memory banks, and (ii) a hash function from among a plurality of possible hash functions, are selected. A hash operation is performed on the lookup key using the selected hash function to compute a first hashed lookup key segment. The first hashed lookup key segment is stored in the selected first memory bank, and one or more hashed lookup key segments corresponding to the lookup key are stored in one or more subsequent memory banks of the two or more memory banks.
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