Hash collision resolution with key compression in a MAC forwarding data structure
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United States of America Patent
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Nov 13, 2012
Grant Date -
May 31, 2012
app pub date -
Nov 30, 2010
filing date -
Nov 30, 2010
priority date (Note) -
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Abstract
Embodiments of the invention include a method performed in a media access control (MAC) forwarding control module within a network element for looking up a MAC address and interface (I/F) identifier pair (MAC-I/F pair) from a MAC forwarding data structure that comprises a first tier data structure and a plurality of second tier data structures. The MAC forwarding data structure utilizes compressed keys to index each of the plurality second tier data structures. The compressed key is generated with a desired MAC address and a mask bit list that corresponds with enough bit positions such that all MAC addresses in second tier data structure can be uniquely addressed with just the values of each MAC address in the bit positions listed. As such, the MAC forwarding data structure is constructed so that the total cost of a lookup with the compressed key technique is deterministic and, therefore, O(1).
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