WO2001005116A3 - Routing method and apparatus - Google Patents

Routing method and apparatus Download PDF

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Publication number
WO2001005116A3
WO2001005116A3 PCT/US2000/019243 US0019243W WO0105116A3 WO 2001005116 A3 WO2001005116 A3 WO 2001005116A3 US 0019243 W US0019243 W US 0019243W WO 0105116 A3 WO0105116 A3 WO 0105116A3
Authority
WO
WIPO (PCT)
Prior art keywords
forwarding
prefix
data packets
search
longest matching
Prior art date
Application number
PCT/US2000/019243
Other languages
French (fr)
Other versions
WO2001005116A2 (en
Inventor
James Mckeon
Dean Schmaltz
Original Assignee
Alteon Web Systems Inc
James Mckeon
Dean Schmaltz
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 Alteon Web Systems Inc, James Mckeon, Dean Schmaltz filed Critical Alteon Web Systems Inc
Priority to AU62143/00A priority Critical patent/AU6214300A/en
Publication of WO2001005116A2 publication Critical patent/WO2001005116A2/en
Publication of WO2001005116A3 publication Critical patent/WO2001005116A3/en

Links

Classifications

    • 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
    • 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
    • H04L45/74591—Address table lookup; Address filtering using content-addressable memories [CAM]
    • 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
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/10—Mapping addresses of different types

Abstract

A method and apparatus for routing data packets over an IP network reduces processing overhead of making forwarding decisions by conducting the longest matching prefix search according to an optimization algorithm, the optimization algorithm being implemented on a layer three engine: a programmable hardware component. A portion of the destination address of a data packet is used to form a prefix of predetermined length. A record returned from a search of a Direct Lookup Table indicates that routes are present in a Forwarding Table that share that prefix and what their lengths are. The Forwarding Table, a translation of a conventional routing table, is traversed, starting with the longest prefix until a match is found, the longest matching prefix. A delivery Table and a Forwarding Cache contain the results of previous forwarding lookups. A packet bearing a destination address found in the Delivery Table or the Forwarding Cache is forwarded without performing a longest matching prefix search at all. Thus, the overhead of a single forwarding decision is amortized over a large number of data packets. The apparatus for routing data packets is embodied as a switch, the switch including a master processor, one or more memories, and one or more gigabit network engines, hardware components, each one including a control processor and a layer three engine.
PCT/US2000/019243 1999-07-13 2000-07-13 Routing method and apparatus WO2001005116A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU62143/00A AU6214300A (en) 1999-07-13 2000-07-13 Method and apparatus for conducting the ip longest prefix match search

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14345799P 1999-07-13 1999-07-13
US60/143,457 1999-07-13

Publications (2)

Publication Number Publication Date
WO2001005116A2 WO2001005116A2 (en) 2001-01-18
WO2001005116A3 true WO2001005116A3 (en) 2001-05-17

Family

ID=22504164

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/019243 WO2001005116A2 (en) 1999-07-13 2000-07-13 Routing method and apparatus

Country Status (2)

Country Link
AU (1) AU6214300A (en)
WO (1) WO2001005116A2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102739526A (en) * 2012-06-13 2012-10-17 烽火通信科技股份有限公司 Realization method of efficient distributed routing list realizing method
US8856379B2 (en) 1997-10-14 2014-10-07 A-Tech Llc Intelligent network interface system and method for protocol processing
US8893159B1 (en) 2008-04-01 2014-11-18 Alacritech, Inc. Accelerating data transfer in a virtual computer system with tightly coupled TCP connections
US9009223B2 (en) 1997-10-14 2015-04-14 Alacritech, Inc. Method and apparatus for processing received network packets on a network interface for a computer
US9306793B1 (en) 2008-10-22 2016-04-05 Alacritech, Inc. TCP offload device that batches session layer headers to reduce interrupts as well as CPU copies
US9413788B1 (en) 2008-07-31 2016-08-09 Alacritech, Inc. TCP offload send optimization

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US6427173B1 (en) 1997-10-14 2002-07-30 Alacritech, Inc. Intelligent network interfaced device and system for accelerated communication
US6658480B2 (en) 1997-10-14 2003-12-02 Alacritech, Inc. Intelligent network interface system and method for accelerated protocol processing
US6427171B1 (en) 1997-10-14 2002-07-30 Alacritech, Inc. Protocol processing stack for use with intelligent network interface device
US7237036B2 (en) 1997-10-14 2007-06-26 Alacritech, Inc. Fast-path apparatus for receiving data corresponding a TCP connection
US6591302B2 (en) 1997-10-14 2003-07-08 Alacritech, Inc. Fast-path apparatus for receiving data corresponding to a TCP connection
US6687758B2 (en) 2001-03-07 2004-02-03 Alacritech, Inc. Port aggregation for network connections that are offloaded to network interface devices
US6807581B1 (en) 2000-09-29 2004-10-19 Alacritech, Inc. Intelligent network storage interface system
US7042898B2 (en) 1997-10-14 2006-05-09 Alacritech, Inc. Reducing delays associated with inserting a checksum into a network message
US6697868B2 (en) 2000-02-28 2004-02-24 Alacritech, Inc. Protocol processing stack for use with intelligent network interface device
US7284070B2 (en) 1997-10-14 2007-10-16 Alacritech, Inc. TCP offload network interface device
US6389479B1 (en) 1997-10-14 2002-05-14 Alacritech, Inc. Intelligent network interface device and system for accelerated communication
US8782199B2 (en) 1997-10-14 2014-07-15 A-Tech Llc Parsing a packet header
US6757746B2 (en) 1997-10-14 2004-06-29 Alacritech, Inc. Obtaining a destination address so that a network interface device can write network data without headers directly into host memory
US6975631B1 (en) * 1998-06-19 2005-12-13 Juniper Networks, Inc. Network packet forwarding lookup with a reduced number of memory accesses
US8019901B2 (en) 2000-09-29 2011-09-13 Alacritech, Inc. Intelligent network storage interface system
US6981058B2 (en) * 2001-03-07 2005-12-27 Broadcom Corporation System and method for slot based ARL table learning with concurrent table search using write snoop
US6665202B2 (en) 2001-09-25 2003-12-16 Integrated Device Technology, Inc. Content addressable memory (CAM) devices that can identify highest priority matches in non-sectored CAM arrays and methods of operating same
US7543087B2 (en) 2002-04-22 2009-06-02 Alacritech, Inc. Freeing transmit memory on a network interface device prior to receiving an acknowledgement that transmit data has been received by a remote device
US7039018B2 (en) 2002-07-17 2006-05-02 Intel Corporation Technique to improve network routing using best-match and exact-match techniques
US7142541B2 (en) * 2002-08-09 2006-11-28 Intel Corporation Determining routing information for an information packet in accordance with a destination address and a device address
CN100337441C (en) * 2003-04-30 2007-09-12 华为技术有限公司 Method for table lookup in packet forwarding
CN102307250A (en) * 2011-10-12 2012-01-04 北京网康科技有限公司 Method and device for searching IP (Internet Protocol) address
CN115483211A (en) 2014-08-19 2022-12-16 维西埃-硅化物公司 Electronic circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LAMPSON B ET AL: "IP LOOKUPS USING MULTIWAY AND MULTICOLUMN SEARCH", IEEE / ACM TRANSACTIONS ON NETWORKING,IEEE INC. NEW YORK,US, vol. 7, no. 3, June 1999 (1999-06-01), pages 324 - 334, XP000834485, ISSN: 1063-6692 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8856379B2 (en) 1997-10-14 2014-10-07 A-Tech Llc Intelligent network interface system and method for protocol processing
US9009223B2 (en) 1997-10-14 2015-04-14 Alacritech, Inc. Method and apparatus for processing received network packets on a network interface for a computer
US8893159B1 (en) 2008-04-01 2014-11-18 Alacritech, Inc. Accelerating data transfer in a virtual computer system with tightly coupled TCP connections
US9413788B1 (en) 2008-07-31 2016-08-09 Alacritech, Inc. TCP offload send optimization
US9306793B1 (en) 2008-10-22 2016-04-05 Alacritech, Inc. TCP offload device that batches session layer headers to reduce interrupts as well as CPU copies
CN102739526A (en) * 2012-06-13 2012-10-17 烽火通信科技股份有限公司 Realization method of efficient distributed routing list realizing method

Also Published As

Publication number Publication date
AU6214300A (en) 2001-01-30
WO2001005116A2 (en) 2001-01-18

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