Network routing table using content addressable memory
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United States of America Patent
Stats
-
Jan 30, 2001
Grant Date -
N/A
app pub date -
Jul 9, 1997
filing date -
Jul 9, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A routing table comprises routing table entries [230], a word line driver [92], prioritizer [100], and memory [106]. Each routing table entry [230] comprises content addressable memory (CAM) cells [220] and an entry masking circuit. The routing table looks up in parallel an entry matching an input network address, and outputs the search result in deterministic time. Only the bits specified by the masking circuit in each entry are compared when searching. If multiple entries match the input, the prioritizer [100] uses mask information from the masking circuits of the matching entries to select the best entry, e.g. the entry having the most matching bits.
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