WO2003077459A3 - Network configuration protocol and method for rapid traffic recovery and loop avoidance in ring topologies - Google Patents

Network configuration protocol and method for rapid traffic recovery and loop avoidance in ring topologies Download PDF

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Publication number
WO2003077459A3
WO2003077459A3 PCT/US2003/006550 US0306550W WO03077459A3 WO 2003077459 A3 WO2003077459 A3 WO 2003077459A3 US 0306550 W US0306550 W US 0306550W WO 03077459 A3 WO03077459 A3 WO 03077459A3
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WO
WIPO (PCT)
Prior art keywords
ring
rings
master bridge
blocking
ports
Prior art date
Application number
PCT/US2003/006550
Other languages
French (fr)
Other versions
WO2003077459A2 (en
Inventor
Ivy Pei-Shan Hsu
Rajkumar Jalan
Gurudeep Kamat
Andrew Tai-Chin Kuo
Jordi Moncada-Elias
Original Assignee
Foundry Networks 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 Foundry Networks Inc filed Critical Foundry Networks Inc
Priority to AU2003213703A priority Critical patent/AU2003213703A1/en
Publication of WO2003077459A2 publication Critical patent/WO2003077459A2/en
Publication of WO2003077459A3 publication Critical patent/WO2003077459A3/en

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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
    • 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]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration
    • 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
    • H04L45/18—Loop-free operations

Abstract

A network configuration protocol and algorithm are described which resolve deficiencies with existing protocols. A large network having many bridges may be built as a combination of smaller networks, many of which may be arranged in a ring topology. Each ring may be monitored by a single master bridge (20) regularly sending control packets, and each other bridge (10) in the ring does not make decisions with respect to its status. A loop free topology is achieved by selectively blocking (20b) and unblocking (20a) data traffic in one of the ring ports of the single master bridge (20) for the ring, while all other bridges (10) in the ring keep their ports in non-blocked states. In multiple ring topologies, each ring has a single master bridge which chooses one of its ports to be blocking. When rings are connected through a shared link formed between two shared bridges, rings with higher priorities carry control packets of rings with lower priorities so that, in case of failure of the shared link, a single ring may be formed from the connected rings with only the master bridge of the higher priority ring aware of and monitoring the larger ring. In case of any link failure inside a given ring, the master bridge quickly detects the failure and automatically changes its blocking port to a non-blocking state in which traffic may flow and follow an alternate path, avoiding the failed link.
PCT/US2003/006550 2002-03-04 2003-03-03 Network configuration protocol and method for rapid traffic recovery and loop avoidance in ring topologies WO2003077459A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003213703A AU2003213703A1 (en) 2002-03-04 2003-03-03 Network configuration protocol and method for rapid traffic recovery and loop avoidance in ring topologies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/090,669 2002-03-04
US10/090,669 US6717922B2 (en) 2002-03-04 2002-03-04 Network configuration protocol and method for rapid traffic recovery and loop avoidance in ring topologies

Publications (2)

Publication Number Publication Date
WO2003077459A2 WO2003077459A2 (en) 2003-09-18
WO2003077459A3 true WO2003077459A3 (en) 2003-12-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/006550 WO2003077459A2 (en) 2002-03-04 2003-03-03 Network configuration protocol and method for rapid traffic recovery and loop avoidance in ring topologies

Country Status (3)

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US (1) US6717922B2 (en)
AU (1) AU2003213703A1 (en)
WO (1) WO2003077459A2 (en)

Families Citing this family (112)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3664935B2 (en) * 2000-03-17 2005-06-29 アンリツ株式会社 Bridge routing method using spanning tree protocol and bridge with spanning tree protocol
US7209435B1 (en) 2002-04-16 2007-04-24 Foundry Networks, Inc. System and method for providing network route redundancy across Layer 2 devices
US7680031B1 (en) * 2002-04-26 2010-03-16 Redback Networks Inc. Method and apparatus for load balancing and protecting data traffic in an optical ring
US6961306B2 (en) * 2002-07-10 2005-11-01 I/O Controls Corporation Fiber optic control network and related method
US7046621B2 (en) * 2002-07-10 2006-05-16 I/O Controls Corporation Redundant multi-fiber optical ring network
US6965560B2 (en) * 2002-07-10 2005-11-15 I/O Controls Corporation Multi-tier, hierarchical fiber optic control network
US8462668B2 (en) 2002-10-01 2013-06-11 Foundry Networks, Llc System and method for implementation of layer 2 redundancy protocols across multiple networks
TWI254527B (en) * 2003-02-19 2006-05-01 Nec Corp Network system, spanning tree configuration method and spanning tree configuration node
US7545735B1 (en) * 2003-03-11 2009-06-09 Atrica Israel Ltd. Scalable protection mechanism for hierarchical multicast service in ring based networks
US9451422B2 (en) * 2003-03-17 2016-09-20 Nokia Technologies Oy Method, system and network device for routing a message to a temporarily unavailable network user
US7672228B1 (en) * 2003-03-19 2010-03-02 Extreme Networks, Inc. System and method for network loop detection and recovery
US7339887B2 (en) * 2003-05-06 2008-03-04 Overture Networks, Inc. Multipoint protected switching ring
CA2566005C (en) * 2003-05-06 2009-12-15 Overture Networks, Inc. Protected switching ring
US7355965B2 (en) * 2003-05-06 2008-04-08 Overture Networks, Inc. Apparatus and method for rapid detection of unidirectional breaks in a network ring
US7602706B1 (en) * 2003-05-15 2009-10-13 Cisco Technology, Inc. Inter-ring protection for shared packet rings
US7627654B2 (en) 2003-06-09 2009-12-01 Foundry Networks, Inc. System and method for multiple spanning tree protocol domains in a virtual local area network
US7564858B1 (en) 2003-08-01 2009-07-21 Foundry Networks, Inc. System and method for enabling a remote instance of a loop avoidance protocol
US7558205B1 (en) * 2003-08-01 2009-07-07 Foundry Networks, Inc. System and method for detecting and isolating a remote loop
US7339900B2 (en) * 2003-09-26 2008-03-04 Sun Microsystem, Inc. Method and apparatus for preventing spanning tree loops during traffic overload conditions
JP4088246B2 (en) * 2003-12-05 2008-05-21 富士通株式会社 Ring network master setting method and apparatus
US8520507B1 (en) * 2004-03-08 2013-08-27 Extreme Networks, Inc. Ethernet automatic protection switching
US7675869B1 (en) * 2004-07-06 2010-03-09 Marvell International Limited Apparatus and method for master election and topology discovery in an Ethernet network
JP4397292B2 (en) * 2004-07-09 2010-01-13 富士通株式会社 Control packet loop prevention method and bridge device using the same
US7417953B2 (en) * 2004-11-01 2008-08-26 Alcatel Lucent Port re-enabling by monitoring link status
WO2006065795A2 (en) * 2004-12-14 2006-06-22 Alcatel Lucent Ring rapid spanning tree protocol
GB2421669A (en) * 2004-12-22 2006-06-28 Siemens Ag Method for restoring a link in a communication ring system
JP4621212B2 (en) * 2005-01-07 2011-01-26 富士通株式会社 Data transmission device
ATE525829T1 (en) * 2005-02-28 2011-10-15 Ibm BLADE SERVER SYSTEM HAVING AT LEAST ONE STACKED SWITCH WITH MULTIPLE SWITCHES CONNECTED TO EACH OTHER AND CONFIGURED FOR MANAGEMENT AND OPERATION AS A SINGLE VIRTUAL SWITCH
JP4627205B2 (en) * 2005-03-28 2011-02-09 富士通株式会社 Ring network system and failure recovery method
CN100370753C (en) * 2005-04-04 2008-02-20 华为技术有限公司 Method for preventing user side loop network on digital user line concentrator
US8050183B2 (en) 2005-05-06 2011-11-01 Cisco Technology, Inc. System and method for implementing reflector ports within hierarchical networks
EP1727313A1 (en) * 2005-05-25 2006-11-29 Siemens Aktiengesellschaft Ring network and method for automatic protection switching
ES2311901T3 (en) * 2005-05-31 2009-02-16 NOKIA SIEMENS NETWORKS GMBH & CO. KG PROCEDURE FOR SWITCHING PROTECTION.
US7606240B1 (en) 2005-06-16 2009-10-20 Extreme Networks Ethernet automatic protection switching
US8325629B2 (en) 2005-07-15 2012-12-04 Cisco Technology, Inc. System and method for assuring the operation of network devices in bridged networks
RU2431935C2 (en) * 2005-08-08 2011-10-20 Дженисис Текникал Системз, Корп. Shared dsl network and deployment method thereof
US7778205B2 (en) * 2005-08-30 2010-08-17 Cisco Technology, Inc. System and method for implementing virtual ports within ring networks
US20070070974A1 (en) * 2005-09-29 2007-03-29 Mo Rooholamini Event delivery in switched fabric networks
WO2007044939A2 (en) * 2005-10-13 2007-04-19 Opvista Incorporated Optical ring networks using circulating optical probe in protection switching with automatic reversion
US7590120B2 (en) * 2005-11-18 2009-09-15 Cisco Technology, Inc. Enhanced multicast VLAN registration
US7911938B2 (en) 2006-01-20 2011-03-22 Cisco Technology, Inc. System and method for preventing loops in the presence of control plane failures
US8570857B2 (en) * 2006-04-07 2013-10-29 At&T Intellectual Property I, Lp Resilient IP ring protocol and architecture
US7796532B2 (en) * 2006-05-31 2010-09-14 Cisco Technology, Inc. Media segment monitoring
US8085676B2 (en) * 2006-06-29 2011-12-27 Nortel Networks Limited Method and system for looping back traffic in QIQ ethernet rings and 1:1 protected PBT trunks
US20100238813A1 (en) * 2006-06-29 2010-09-23 Nortel Networks Limited Q-in-Q Ethernet rings
US8248920B2 (en) * 2006-07-25 2012-08-21 Cisco Technology, Inc. Alternate spanning tree for faster indirect link failure recovery
US8111634B2 (en) * 2006-08-15 2012-02-07 Cisco Technology, Inc. System and method for integrating ring-protocol-compatible devices into network configurations that also include non-ring-protocol compatible devices
CN101141366A (en) * 2006-09-07 2008-03-12 华为技术有限公司 Method of preventing data loop in ring ethernet
DE602007008275D1 (en) * 2006-09-29 2010-09-16 Nokia Siemens Networks Gmbh PROCEDURE FOR PROTECTIVE SWITCHING IN RINGTOPOLOGIES
WO2008056088A2 (en) 2006-11-10 2008-05-15 Thomson Licensing Method for restoring a service booking system in a network after failure
US7814248B2 (en) * 2006-12-07 2010-10-12 Integrated Device Technology, Inc. Common access ring/sub-ring system
US7809871B2 (en) * 2006-12-07 2010-10-05 Integrated Device Technology Inc. Common access ring system
CN101232428B (en) 2007-01-23 2012-05-23 华为技术有限公司 Ethernet loop protection method and apparatus
CN101232427A (en) 2007-01-23 2008-07-30 华为技术有限公司 Ethernet loop protection method and apparatus
US8520508B2 (en) * 2007-02-13 2013-08-27 Force10 Networks, Inc. Spanning tree ring protocol
US8411690B2 (en) * 2007-02-27 2013-04-02 Cisco Technology, Inc. Preventing data traffic connectivity between endpoints of a network segment
JP2008278337A (en) * 2007-05-01 2008-11-13 Brother Ind Ltd Information distribution system, terminal apparatus used in same system, program, and loop connection avoidance method
JP5092546B2 (en) * 2007-05-30 2012-12-05 日本電気株式会社 RELAY DEVICE, NETWORK, AND FRAME RELAY METHOD USED FOR THEM
WO2009012409A2 (en) 2007-07-17 2009-01-22 Opvista Incorporated Optical ring networks having node-to-node optical communication channels for carrying data traffic
JP4874185B2 (en) 2007-07-19 2012-02-15 アラクサラネットワークス株式会社 Multi-fault handling system and shared link terminator used therefor
EP2023542B1 (en) * 2007-08-06 2010-10-06 Nokia Siemens Networks Oy Method and device for operating a network and communication system comprising such device
EP2183885B1 (en) * 2007-08-14 2012-06-06 Telefonaktiebolaget LM Ericsson (publ) Network reconfiguration method
CN101127674B (en) * 2007-09-25 2011-11-30 中兴通讯股份有限公司 Initialization method for transmission nodes of Ethernet loop network system
CN101127675A (en) * 2007-09-25 2008-02-20 中兴通讯股份有限公司 Initialization method for main nodes of Ethernet loop network system
CA2620490C (en) 2007-10-04 2016-06-28 Genesis Technical Systems Corp. Remote powering of dsl adms
US7801028B2 (en) * 2007-12-31 2010-09-21 Schneider Automation Inc. Method and apparatus for transparent auto-recovery in chain and ring networks
US7944815B2 (en) * 2008-02-14 2011-05-17 Allied Telesis Holdings K.K. System and method for network recovery from multiple link failures
JP2009206891A (en) * 2008-02-28 2009-09-10 Nec Corp Layer 2 ring network system and management method therefor
CN101534232B (en) * 2008-03-10 2012-12-19 中兴通讯股份有限公司 Method for preventing internet storm occurring in Ether multi-ring network
US8107383B2 (en) 2008-04-04 2012-01-31 Extreme Networks, Inc. Reducing traffic loss in an EAPS system
CN101252500B (en) * 2008-04-16 2012-08-08 杭州华三通信技术有限公司 Intersect looped network, node and realizing method of random topology intersect looped network
US8004966B2 (en) * 2008-04-25 2011-08-23 Calix, Inc. Efficient management of ring networks
US8605573B2 (en) * 2008-06-26 2013-12-10 Shore Microsystems Inc. Autolearning network link protection device
US7856019B2 (en) 2008-08-29 2010-12-21 Extreme Networks, Inc. Convergence of multicast traffic
CN101686158B (en) * 2008-09-22 2012-11-14 中兴通讯股份有限公司 Control method for Ethernet loop guard fault recovery and Ethernet loop node
CN101741670B (en) * 2008-11-27 2012-12-19 中兴通讯股份有限公司 Method for protecting multi-ring Ethernet
WO2010066300A1 (en) * 2008-12-11 2010-06-17 Telefonaktiebolaget Lm Ericsson (Publ) Communications network
US8699380B2 (en) * 2009-01-30 2014-04-15 Telefonaktiebolaget Lm Ericsson (Publ) Port table flushing in ethernet networks
TW201042953A (en) * 2009-05-21 2010-12-01 Moxa Inc Processing method of redundancy check for chain network
CN101562552B (en) * 2009-05-27 2011-09-14 华为技术有限公司 Method, system and device for detecting virtual private LAN loop
IL199146A0 (en) * 2009-06-04 2010-04-29 Eci Telecom Ltd Method and network for combined protection of ethernet traffic
IL200503A0 (en) * 2009-08-20 2011-08-01 Eci Telecom Ltd Technique for dual homing interconnection between communication networks
CN101997735A (en) * 2009-08-25 2011-03-30 中兴通讯股份有限公司 Monocylic network topology reconstruction method and system thereof
US8254409B2 (en) 2009-12-01 2012-08-28 Cisco Technology, Inc. User isolation between network devices
US9485050B2 (en) 2009-12-08 2016-11-01 Treq Labs, Inc. Subchannel photonic routing, switching and protection with simplified upgrades of WDM optical networks
US8705741B2 (en) 2010-02-22 2014-04-22 Vello Systems, Inc. Subchannel security at the optical layer
US8654630B2 (en) 2010-03-19 2014-02-18 Brocade Communications Systems, Inc. Techniques for link redundancy in layer 2 networks
EP2553881B1 (en) * 2010-03-30 2015-01-21 Telefonaktiebolaget LM Ericsson (publ) Method for protection against superloops in an ethernet ring
WO2011123002A1 (en) * 2010-03-30 2011-10-06 Telefonaktiebolaget L M Ericsson (Publ) Method for protecting an ethernet ring from a superloop going through the ethernet ring
US8542999B2 (en) 2011-02-01 2013-09-24 Vello Systems, Inc. Minimizing bandwidth narrowing penalties in a wavelength selective switch optical network
CN102170384B (en) * 2011-04-15 2014-06-11 杭州华三通信技术有限公司 Method for processing faults of intersected Ethernet ring and nodes
CN102281168A (en) * 2011-05-10 2011-12-14 中兴通讯股份有限公司 Link fault processing method and device based on OAM (Operation Administration and Maintenance) alarm detection
WO2013002855A1 (en) * 2011-06-30 2013-01-03 Schneider Electric Industries Sas Dual-ring switch for rstp networks
CN102347881A (en) * 2011-09-30 2012-02-08 华为技术有限公司 Method and device for restoring unicast forwarding business flow during Ethernet ring failover
US8625416B2 (en) * 2011-12-29 2014-01-07 Schneider Electric Industries Sas Verifying communication redundancy in a network
US20130176893A1 (en) * 2012-01-05 2013-07-11 General Electric Company Loop Containment Enhancement
US9521010B2 (en) * 2012-04-05 2016-12-13 Schneider Electric Industries Sas Diagnosing and reporting a network break
US8792333B2 (en) * 2012-04-20 2014-07-29 Cisco Technology, Inc. Failover procedure for networks
JP5949255B2 (en) * 2012-07-18 2016-07-06 富士通株式会社 Communication control apparatus and communication control method
US9444641B2 (en) 2012-09-05 2016-09-13 Brocade Communications Systems, Inc. MAC flush optimizations for ethernet rings
US9338060B2 (en) 2012-09-05 2016-05-10 Brocade Communications Systems, Inc. Multiple ring identification and configuration protocol
US9148346B2 (en) 2012-09-05 2015-09-29 Brocade Communications Systems, Inc. Multiple ring identification and configuration protocol
CN105991188B (en) 2015-02-16 2019-09-10 阿里巴巴集团控股有限公司 A kind of method and device detecting sharing memory
CN106549820A (en) 2015-09-23 2017-03-29 阿里巴巴集团控股有限公司 Recognize method, device, flow cleaning equipment and the system of network loop
JP6554405B2 (en) * 2015-11-26 2019-07-31 株式会社日立製作所 Ring network system and network node
WO2017160306A1 (en) * 2016-03-18 2017-09-21 Hewlett Packard Enterprise Development Lp Responses to loops in networks having a ring topology
WO2017195357A1 (en) * 2016-05-13 2017-11-16 三菱電機株式会社 Communication apparatus, communication method, and communication program
US10630590B2 (en) * 2016-07-14 2020-04-21 Mellanox Technologies Tlv Ltd. Credit loop deadlock detection and recovery in arbitrary topology networks
US10158500B2 (en) * 2016-09-13 2018-12-18 Ciena Corporation G.8032 prioritized ring switching systems and methods
US11025537B2 (en) * 2017-12-04 2021-06-01 Is5 Communications, Inc. Multiple RSTP domain separation
US11201759B1 (en) * 2020-07-08 2021-12-14 Schweitzer Engineering Laboratories, Inc. Reconfigurable dual-ring network redundancy
US11463326B2 (en) * 2021-02-24 2022-10-04 Cisco Technology, Inc. Lightweight ring manager with distributed policies

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010021177A1 (en) * 2000-03-10 2001-09-13 Anritsu Corporation Spanning tree bridge and route change method using the same
US6304575B1 (en) * 1998-08-31 2001-10-16 Cisco Technology, Inc. Token ring spanning tree protocol

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6032194A (en) * 1997-12-24 2000-02-29 Cisco Technology, Inc. Method and apparatus for rapidly reconfiguring computer networks
US6373826B1 (en) * 1998-12-15 2002-04-16 Nortel Networks Limited Spanning tree algorithm
US6535490B1 (en) * 1999-03-04 2003-03-18 3Com Corporation High availability spanning tree with rapid reconfiguration with alternate port selection
US6952397B2 (en) * 2001-06-07 2005-10-04 Corrigent Systems Ltd. Communication in a bidirectional ring network with single-direction receiving
US20030048501A1 (en) * 2001-09-12 2003-03-13 Michael Guess Metropolitan area local access service system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6304575B1 (en) * 1998-08-31 2001-10-16 Cisco Technology, Inc. Token ring spanning tree protocol
US20010021177A1 (en) * 2000-03-10 2001-09-13 Anritsu Corporation Spanning tree bridge and route change method using the same

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHAKRABORTY: "Improvement in reliability of the token ring network by reversal of token in case of a single component failure", IEEE CIRCUITS AND SYSTEMS, pages 1152 - 1154, XP000499780 *
LATIF ET AL.: "The IBM 8209 LAN bridge", IEEE NETWORK, May 1992 (1992-05-01), pages 28 - 37, XP001153513 *

Also Published As

Publication number Publication date
AU2003213703A1 (en) 2003-09-22
US20030165119A1 (en) 2003-09-04
AU2003213703A8 (en) 2003-09-22
US6717922B2 (en) 2004-04-06
WO2003077459A2 (en) 2003-09-18

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