WO2001043345A3 - Method and apparatus for longest match address lookup - Google Patents

Method and apparatus for longest match address lookup Download PDF

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Publication number
WO2001043345A3
WO2001043345A3 PCT/CA2000/001443 CA0001443W WO0143345A3 WO 2001043345 A3 WO2001043345 A3 WO 2001043345A3 CA 0001443 W CA0001443 W CA 0001443W WO 0143345 A3 WO0143345 A3 WO 0143345A3
Authority
WO
WIPO (PCT)
Prior art keywords
subtree
sparse
descriptor
descriptors
dense
Prior art date
Application number
PCT/CA2000/001443
Other languages
French (fr)
Other versions
WO2001043345A2 (en
Inventor
David A Brown
Original Assignee
Mosaid Technologies Inc
David A Brown
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mosaid Technologies Inc, David A Brown filed Critical Mosaid Technologies Inc
Priority to GB0213389A priority Critical patent/GB2373083B/en
Priority to JP2001542932A priority patent/JP4741134B2/en
Priority to EP20000984689 priority patent/EP1250775A2/en
Priority to AU21338/01A priority patent/AU2133801A/en
Priority to CA 2395151 priority patent/CA2395151C/en
Priority to DE2000185390 priority patent/DE10085390T1/en
Publication of WO2001043345A2 publication Critical patent/WO2001043345A2/en
Publication of WO2001043345A3 publication Critical patent/WO2001043345A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H04L45/742—Route cache; Operation thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/901—Indexing; Data structures therefor; Storage structures
    • G06F16/9017—Indexing; Data structures therefor; Storage structures using directory or table look-up
    • G06F16/902—Indexing; Data structures therefor; Storage structures using directory or table look-up using more than one table in sequence, i.e. systems with three or more layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C15/00—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/54—Organization of routing tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H04L45/745—Address table lookup; Address filtering
    • H04L45/7453—Address table lookup; Address filtering using hashing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H04L45/745—Address table lookup; Address filtering
    • H04L45/74591—Address table lookup; Address filtering using content-addressable memories [CAM]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99933—Query processing, i.e. searching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99941—Database schema or data structure
    • Y10S707/99943—Generating database or data structure, e.g. via user interface

Abstract

We present a lookup table which allows sparse subtree descriptors and dense subtree descriptors to be stored in the same memory. A subtree entry in the memory stores a dense subtree descriptor for a dense subtree or a plurality of sparse subtree descriptors for sparse subtrees. The subtree entry is indexed by a leaf in the previous subtree. The sparse subtree descriptor stores at least one node descriptor. The node descriptor describes a set of leaves in the sparse subtree having a common value. The common value is encoded in the node descriptor using run length encoding.
PCT/CA2000/001443 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup WO2001043345A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB0213389A GB2373083B (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
JP2001542932A JP4741134B2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
EP20000984689 EP1250775A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
AU21338/01A AU2133801A (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
CA 2395151 CA2395151C (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
DE2000185390 DE10085390T1 (en) 1999-12-10 2000-12-08 Longest match address search method and apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US17023299P 1999-12-10 1999-12-10
US60/170,232 1999-12-10
US21296600P 2000-06-21 2000-06-21
US60/212,966 2000-06-21

Publications (2)

Publication Number Publication Date
WO2001043345A2 WO2001043345A2 (en) 2001-06-14
WO2001043345A3 true WO2001043345A3 (en) 2001-11-29

Family

ID=26865861

Family Applications (4)

Application Number Title Priority Date Filing Date
PCT/CA2000/001444 WO2001043346A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
PCT/CA2000/001442 WO2001043370A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
PCT/CA2000/001441 WO2001043400A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
PCT/CA2000/001443 WO2001043345A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup

Family Applications Before (3)

Application Number Title Priority Date Filing Date
PCT/CA2000/001444 WO2001043346A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
PCT/CA2000/001442 WO2001043370A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup
PCT/CA2000/001441 WO2001043400A2 (en) 1999-12-10 2000-12-08 Method and apparatus for longest match address lookup

Country Status (10)

Country Link
US (5) US7423981B2 (en)
EP (4) EP1250779A2 (en)
JP (4) JP2003516670A (en)
KR (4) KR100748772B1 (en)
CN (5) CN100432991C (en)
AU (4) AU2133901A (en)
CA (4) CA2393760C (en)
DE (4) DE10085387T5 (en)
GB (4) GB2373082B (en)
WO (4) WO2001043346A2 (en)

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