Dynamic IP router tables using highest-priority matching
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United States of America Patent
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Mar 24, 2009
Grant Date -
Jun 3, 2004
app pub date -
Jul 3, 2003
filing date -
Jul 3, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
n) time; a new rule maybe inserted and an old one deleted in O(log n) time. For the case when all rule filters are prefixes, the data structure PBOB (prefix BOB) permits highest-priority matching as well as rule insertion and deletion in O(W) time, where W is the length of the longest prefix, each. When all rule filters are prefixes and longest-prefix matching is to be done, the data structures LMPBOB (longest matching-prefix BOB) permits longest-prefix matching in O(W) time; rule insertion and deletion each take O(log n) time. On practical rule tables, BOB and PBOB perform each of the three dynamic-table operations in O(log n) time and with O(log n) cache misses. The number of cache misses incurred by LMPBOB is also O(log n).
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