System and method of using an exact match table and longest prefix match table as a combined longest prefix match
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United States of America Patent
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Apr 10, 2018
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N/A
app pub date -
May 2, 2017
filing date -
Feb 27, 2015
priority date (Note) -
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Abstract
A method and apparatus of a device that determines a match for a destination address using an exact match table and a longest prefix match table of a network element is described. In an exemplary embodiment, the network element receives a data packet that includes a destination address. The network element generates a key for the destination address, wherein the key represents more addresses than the destination address. The network element further performs an address lookup using the key in an exact match table. Furthermore, a match in the address lookup indicates a first transmitting interface of the network element. The network element additionally performs an address lookup using the destination address with a longest prefix match table, wherein a match in the address lookup indicates a second transmitting interface of the network element. In addition, the network element determines a resulting transmitting interface based on results from the exact match table address lookup and the longest prefix match address lookup. The network element forwards the data packet using the transmitting interface.
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