WO2000024159A3 - Method and apparatus for address lookup - Google Patents

Method and apparatus for address lookup Download PDF

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Publication number
WO2000024159A3
WO2000024159A3 PCT/US1999/024637 US9924637W WO0024159A3 WO 2000024159 A3 WO2000024159 A3 WO 2000024159A3 US 9924637 W US9924637 W US 9924637W WO 0024159 A3 WO0024159 A3 WO 0024159A3
Authority
WO
WIPO (PCT)
Prior art keywords
database
values
comparison
address
entry
Prior art date
Application number
PCT/US1999/024637
Other languages
French (fr)
Other versions
WO2000024159A2 (en
Inventor
Radia J Perlman
Dah Ming Chiu
Original Assignee
Sun Microsystems Inc
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 Sun Microsystems Inc filed Critical Sun Microsystems Inc
Priority to AU12172/00A priority Critical patent/AU1217200A/en
Publication of WO2000024159A2 publication Critical patent/WO2000024159A2/en
Publication of WO2000024159A3 publication Critical patent/WO2000024159A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • 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
    • 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]

Abstract

A method and apparatus that constructs a 'router database' and then uses the database to determine a longest match between a piece of target data, such as an address in a packet to be routed, and the database. The database contains a comparison table having a plurality of entries. In a first embodiment, each entry has up to k values, where 2 < = k < = N, where N is a number of comparison values in the database. In a second embodiment, each entry has up to k-1 values. During operation, various ones of the comparison table entries are loaded and compared to the address to determine a longest matching prefix in the router database. The comparison can be done in parallel.
PCT/US1999/024637 1998-10-20 1999-10-20 Method and apparatus for address lookup WO2000024159A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12172/00A AU1217200A (en) 1998-10-20 1999-10-20 Method and apparatus for longest prefix address lookup

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/175,552 US6526055B1 (en) 1998-10-20 1998-10-20 Method and apparatus for longest prefix address lookup
US09/175,552 1998-10-20

Publications (2)

Publication Number Publication Date
WO2000024159A2 WO2000024159A2 (en) 2000-04-27
WO2000024159A3 true WO2000024159A3 (en) 2000-11-23

Family

ID=22640689

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/024637 WO2000024159A2 (en) 1998-10-20 1999-10-20 Method and apparatus for address lookup

Country Status (3)

Country Link
US (1) US6526055B1 (en)
AU (1) AU1217200A (en)
WO (1) WO2000024159A2 (en)

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Also Published As

Publication number Publication date
AU1217200A (en) 2000-05-08
WO2000024159A2 (en) 2000-04-27
US6526055B1 (en) 2003-02-25

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