CA2427285A1 - Method and system for implementing ospf redundancy - Google Patents

Method and system for implementing ospf redundancy Download PDF

Info

Publication number
CA2427285A1
CA2427285A1 CA002427285A CA2427285A CA2427285A1 CA 2427285 A1 CA2427285 A1 CA 2427285A1 CA 002427285 A CA002427285 A CA 002427285A CA 2427285 A CA2427285 A CA 2427285A CA 2427285 A1 CA2427285 A1 CA 2427285A1
Authority
CA
Canada
Prior art keywords
ospf
processor
information
protocol
standby
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002427285A
Other languages
French (fr)
Other versions
CA2427285C (en
Inventor
Wenge Ren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Technologies Oy
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2427285A1 publication Critical patent/CA2427285A1/en
Application granted granted Critical
Publication of CA2427285C publication Critical patent/CA2427285C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • H04L45/22—Alternate routing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G06F11/2097—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements maintaining the standby controller/processing unit updated
    • 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
    • H04L45/03—Topology update or discovery by updating link state protocols
    • 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
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • 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
    • H04L45/58—Association of routers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
    • G06F11/2038—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant with a single idle spare processing component
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
    • G06F11/2048—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant where the redundant components share neither address space nor persistent storage

Abstract

The present invention relates to a method and system for implementing link level protocol redundancy in a router (11). In particular, the invention relates to providing redundancy of the Open Shortest Path First (OSPF) routing protocol. An active processor (12) provides OSPF operations. In the present invention, a standby processor (18) is coupled to the active processor (12). During an initial synchronization, all network link protocol information from the active processor (12) is forwarded to the standby processor (18). The network link information can include OSPF state information, OSPF configuration information, OSPF adjacencies information, OSPF interface information and OSPF global protocol information. Thereafter, any updates of network link protocol information are immediately forwarded to the standby processor (18). Upon failure of the active processor (12), the router (11) is switched to the standby processor (18) and all OSPF protocol operations are performed on the standby processor (18). In the present invention, all states of the link protocol immediately function as if a failure had not occurred.

Claims (44)

1. A Link protocol redundancy method comprising the steps of:
providing a router having an active processor;
coupling a standby processor to said active processor;
forwarding network link protocol information from said active processor to said standby processor for synchronizing link configuration and link protocol states of said active processor at said standby processor upon coupling of said standby processor to said standby processor; and switching said router to said standby processor when a failure is detected at said active processor;
wherein all states of said link protocol immediately function as if the failure had not occurred.
2. The method of claim 1 wherein said link protocol is an Open Shortest Path First (OSPF) protocol.
3. The method of claim 2 wherein said link protocol information is link-state database information, OSPF configuration information, OSPF adjacencies information, OSPF interface information and OSPF global protocol information.
4. The method of claim 2 further comprising the step of processing identical OSPF packets after synchronizing said link configuration and link protocol states between said active processor and said standby processor
5. The method of claim 3 wherein said step of forwarding link protocol information is performed by the steps of:
creating a hidden OSPF interface for each area of said active processor;
creating a hidden OSPF interface for each area of said standby processor; and forwarding said link-state database information from said hidden OSPF
interface of said active processor to said hidden OSPF interface of said standby processor until said link state database of said standby processor is synchronized with said link state database of said active processor.
6. The method of claim 5 further comprising the step of forwarding said OSPF
configuration information, OSPF adjacencies information, OSPF interface information and OSPF global protocol information using said hidden OSPF interface of said active processor and said hidden OSPF interface of said standby processor.
7. The method of claim 5 wherein said link protocol information is in the form of Inter Process Control (IPC) messages.
8. The method of claim 7 wherein said OSPF configuration information is determined from Command Line Interface (CLI) commands stored in a datastore.
9. The method of claim 1 further comprising the steps of:
updating network link protocol information at said active processor; and forwarding said updated network link protocol information to said standby processor.
10. The method of claim 4 wherein said forwarding step is a process based on a Database Exchange Process of the OSPF protocol.
11. An OSPF protocol redundancy method comprising the steps of:
providing a router having an active processor;
coupling a standby processor to said active processor;
forwarding network OSPF protocol information from said active processor to said standby processor for synchronizing OSPF configuration and OSPF protocol states of said active processor at said standby processor; and switching said router to said standby processor when a failure is detected at said active processor;

wherein all states of said OSPF protocol immediately function as if the failure had not occurred.
12. A link protocol redundancy method comprising the steps of:
providing a muter having an active processor;
coupling a standby processor to said active processor;
forwarding network link protocol information from said active processor to said standby processor for synchronizing link configuration and link protocol states of said active processor at said standby processor said link protocol information is Link-state database information, OSPF configuration information, OSPF adjacencies information, OSPF interface information and OSPF global protocol information.; and switching said router to said standby processor when a failure is detected at said active processor;
wherein all states of said link protocol immediately function as if the failure had not occurred.
13. A method for implementing OSPF redundancy comprising the steps of providing a router having an active processor means and a standby processor means;
building a hidden OSPF interface on said active processor means and a hidden OSPF interface on said standby processor means;
connecting said hidden OSPF interface of said active processor means to said hidden OSPF interface of said standby processor means over a communications lime;
synchronizing an OSPF routing database. using an OSPF protocol over said hidden OSPF interface, such that said OSPF routing database is synchronized when said hidden OSPF interface of said active processor means and said hidden OSPF
interface of said standby processor means reach a full adjacency state;
transferring OSPF protocol information from said hidden OSPF interface of said active processor means to said hidden OSPF interface of said standby processor means over said communications Link to mirror states of said active processor means and said standby processor means;
14 removing said hidden interface of said active processor means and said hidden interface of said standby processor means; and assuming control by said standby processor means when a failure is detected in said active processor means.

14. The method of claim 13 wherein said OSPF protocol information is OSPF
configuration information, OSPF adjacencies information, OSPF interface information and OSPF global protocol information.
15. The method of claim 14 wherein said OSPF configuration information is determined from Commercial Line Interface (CLI) commands stored in a datastore.
16. The method of claim 13 further comprising the steps of:
updating network link protocol information at said active processor means; and forwarding said updated network link protocol information to said standby processor means.
17. The method of claim 13 wherein said synchronizing step is a process based on a Database Exchange Process of the OSPF protocol.
18. The method of claim 13 further comprising the step of processing identical OSPF packets after synchronizing said link configuration and lime protocol states between said active processor and said standby processor
19. A system for providing link protocol redundancy in a router comprising:
an active processor;
a standby processor;
means for forwarding network link protocol information from said active processor to said standby processor for synchronizing lime configuration and link protocol states of said active processor at said standby processor; and means for switching said router to said standby processor when a failure is detected at said active processor;
wherein all states of said link protocol immediately function as if the failure had not occurred.
20. The system of claim 19 wherein said link protocol is an Open Shortest Path First (OSPF) protocol.
21. The system of claim 19 wherein said link protocol information is link-state database information, OSPF configuration information, OSPF adjacencies information, OSPF interface information and OSPF global protocol information.
22. The system of claim 21 wherein said means for forwarding link protocol information comprises:
means for creating a hidden OSPF interface on for each area of said active processor;
means for creating a hidden OSPF interface for each area of said standby processor; and means for forwarding said link-state database information from said hidden OSPF
interface of said active processor to said hidden OSPF interface of said standby processor until said link state database of said standby processor is synchronized with said link state database of said active processor.
23. The system of claim 22 wherein said means for forwarding link protocol information comprises forwarding said OSPF configuration information, said OSPF
adjacencies information, said OSPF interface information and said OSPF global protocol information using said hidden OSPF interface of said active processor and said hidden OSPF interface of said standby processor.
24. The system of claim 23 wherein said OSPF configuration information is determined from Command Line Interface (CLI) commands stored in a datastore.
25. The system of claim 19 further comprising:
means for updating network link protocol information at said active processor;
and means for forwarding said updated network link protocol information to said standby processor.
26. The system of claim 19 wherein said means for forwarding network link protocol information comprises:
a redundant card manager for maintaining a synchronization state machine of said link protocol states for tasks of said protocol, said network link protocol information being forwarded through said redundant card manager.
27. The system of claim 19 further comprising a task manager for determining said link protocol states of said tasks and forwarding said link protocol states to said redundant card manager.
28. The system of claim 19 wherein said means for switching said router to said standby processor comprises a software redundancy manager which interacts with said redundant card manager to indicate switch over from said active processor to said standby processor.
29. The system of claim 19 wherein said state of said tasks enters an OSPF_FAULT_INIT state which is an initial state before coupling of standby processor to said active processor.
30. The system of claim 19 wherein said state of said tasks enters an OSPF_FAULT_VERIFY state which is entered during synchronization of said link configuration of said active processor and said standby processor.
31. The system of claim 19 wherein said state of said tasks enters an OSPF_FAULT_SYNC state during forwarding of said link protocol information from said active processor to said standby processor, said link protocol information comprising link-state database information, OSPF configuration information, OSPF
adjacencies information, OSPF interface information and OSPF global protocol information.
32. The system of claim 19 wherein said state of said tasks, enters an OSPF_FAULT_FULL state after said forwarding network link protocol information, said OSPF_FAULT_FULL state is a hot standby state wherein said standby state can immediately take over all operations of said standby processor.
33. The system of claim 19 wherein said active processor is an active OSPF
control card.
34. The system of claim 19 wherein said standby processor is a standby OSPF
control card.
35. The system of claim 19 wherein said means for forwarding is a process based on a Database Exchange Process of the OSPF protocol.
36. The system of claim 19 further comprising:
means for processing identical OSPF packets after synchronizing said link configuration and link protocol states between said active processor and said standby processor.
37. A system for providing open shortest path first (OSPF) protocol redundancy in a router comprising:
an active processor;
a standby processor;
means for forwarding network open shortest path first (OSPF) protocol information from said active processor to said standby processor for synchronizing link configuration and open shortest path first (OSPF) protocol states of said active processor at said standby processor; and means for switching said router to said standby processor when a failure is detected at said active processor;
wherein all states of said open shortest path first (OSPF) protocol immediately function as if the failure had not occurred.
38. A system for providing open shortest path first (OSPF) protocol redundancy in a router comprising:
an active processor;
a standby processor;
means for forwarding network open shortest path first (OSPF) protocol information from said active processor to said standby processor for synchronizing link configuration and open shortest path first (OSPF) protocol states of said active processor at said standby processor link-state database information, OSPF configuration information, OSPF adjacencies information, OSPF interface information and OSPF
global protocol information; and means for switching said router to said standby processor when a failure is detected at said active processor;
wherein all states of said open shortest path first (OSPF) protocol immediately function as if the failure had not occurred.
39. A system for implementing OSPF redundancy in a router comprising:
an active processor means;
a standby processor means;
means for building a hidden OSPF interface on said active processor means and a hidden OSPF interface on said standby processor means;
means for connecting said hidden OSPF interface of said active processor means to said hidden OSPF interface of said standby processor means over a communications link;

means for synchronizing an OSPF routing database using an OSPF protocol over said hidden OSPF interface, such that said OSPF routing database is synchronized when said hidden OSPF interface of said active processor means and said hidden OSPF
interface of said standby processor means reach a full adjacency state;
means for transferring OSPF protocol information from said hidden OSPF
interface of said active processor means to said hidden OSPF interface of said standby processor means over said communications link to mirror states of said active processor means and standby processor means;
means for removing said hidden interface of said active processor means and said hidden interface of said standby processor means; and means for assuming control by said standby processor means when a failure is detected in said active processor means.
40. The system of claim 39 wherein said OSPF protocol information is OSPF
configuration information, OSPF adjacencies information, OSPF interface information and OSPF global protocol information.
41. The system of claim 39 wherein said OSPF configuration information is determined from Command Line Interface (CLI) commands stored in a datastore.
42. The system of claim 39 further comprising:
means for updating network lime protocol information at said active processor means; and means for forwarding said updated network link protocol information to said standby processor means.
43. The system of claim 39 wherein said means for forwarding is a process based on a Database Exchange Process of the OSPF protocol.
44. The system of claim 39 further comprising:

means for processing identical OSPF packets after synchronizing said link configuration and link protocol states between said active processor and said standby processor.
CA002427285A 2001-08-22 2002-07-15 Method and system for implementing ospf redundancy Expired - Fee Related CA2427285C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/934,884 2001-08-22
US09/934,884 US7490161B2 (en) 2001-08-22 2001-08-22 Method and system for implementing OSPF redundancy
PCT/US2002/022220 WO2003023637A1 (en) 2001-08-22 2002-07-15 Method and system for implementing ospf redundancy

Publications (2)

Publication Number Publication Date
CA2427285A1 true CA2427285A1 (en) 2003-03-20
CA2427285C CA2427285C (en) 2010-02-02

Family

ID=25466231

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002427285A Expired - Fee Related CA2427285C (en) 2001-08-22 2002-07-15 Method and system for implementing ospf redundancy

Country Status (6)

Country Link
US (1) US7490161B2 (en)
EP (1) EP1352335A4 (en)
JP (1) JP2005503055A (en)
CN (1) CN1311381C (en)
CA (1) CA2427285C (en)
WO (1) WO2003023637A1 (en)

Families Citing this family (73)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2819360B1 (en) * 2001-01-11 2003-04-11 Cit Alcatel ROUTING SYSTEM PROVIDING THE CONTINUITY OF SERVICE OF THE INTERFACES ASSOCIATED WITH NEIGHBORING NETWORKS
FR2819359B1 (en) * 2001-01-11 2003-04-11 Cit Alcatel ROUTING SYSTEM PROVIDING CONTINUITY OF SERVICE, STATE MACHINES ASSOCIATED WITH NEIGHBORING ROUTING SYSTEMS
US7065059B1 (en) * 2001-08-09 2006-06-20 Cisco Technology, Inc. Technique for restoring adjacencies in OSPF in a non-stop forwarding intermediate node of a computer network
US20030123457A1 (en) * 2001-12-27 2003-07-03 Koppol Pramod V.N. Apparatus and method for distributed software implementation of OSPF protocol
US8769154B2 (en) * 2002-01-24 2014-07-01 Alcatel Lucent Method and apparatus for facilitating routing protocol redundancy in a network element
US7522588B2 (en) * 2002-05-13 2009-04-21 Qualcomm Incorporated System and method for reference data processing in network assisted position determination
US7292535B2 (en) * 2002-05-23 2007-11-06 Chiaro Networks Ltd Highly-available OSPF routing protocol
US7590760B1 (en) * 2002-05-24 2009-09-15 Cisco Technology, Inc. Hybrid interface synchronization method and driver-client model for high availability systems
US7275081B1 (en) 2002-06-10 2007-09-25 Juniper Networks, Inc. Managing state information in a computing environment
FI20021235A0 (en) * 2002-06-24 2002-06-24 Nokia Corp A method and system for redundant IP forwarding in a telecommunications network
US7440394B2 (en) 2002-06-24 2008-10-21 Nokia Corporation Method and system for redundant IP forwarding in a telecommunications network
US7236453B2 (en) * 2002-06-27 2007-06-26 Jeremy Benjamin, Trustee High available method for border gateway protocol version 4
US7269133B2 (en) * 2002-09-03 2007-09-11 Jeremy Benjamin IS-IS high availability design
US7363534B1 (en) * 2002-09-30 2008-04-22 Cisco Technology, Inc. Method and system for stateful switch-over in a high-availability point to point system
US6850492B2 (en) * 2002-11-22 2005-02-01 Nokia Corporation Method and system for enabling a route and flow table update in a distributed routing platform
JP4385834B2 (en) * 2003-04-15 2009-12-16 パナソニック株式会社 Routing control method and router apparatus
US7319674B2 (en) * 2003-07-24 2008-01-15 Cisco Technology, Inc. System and method for exchanging awareness information in a network environment
US7739403B1 (en) * 2003-10-03 2010-06-15 Juniper Networks, Inc. Synchronizing state information between control units
US8009556B2 (en) * 2003-10-17 2011-08-30 Ip Infusion, Inc. System and method for providing redundant routing capabilities for a network node
US7929424B2 (en) * 2003-10-31 2011-04-19 Ericsson Ab Switchover for broadband subscriber sessions
CN100407727C (en) * 2004-01-18 2008-07-30 中兴通讯股份有限公司 An inter-processor communication method based on message
JP4789425B2 (en) * 2004-03-31 2011-10-12 富士通株式会社 Route table synchronization method, network device, and route table synchronization program
JP4058014B2 (en) * 2004-04-08 2008-03-05 株式会社日立製作所 Packet transfer device
US7284148B2 (en) * 2004-06-17 2007-10-16 International Business Machines Corporation Method and system for self-healing in routers
US7586838B2 (en) * 2004-06-22 2009-09-08 Skylead Assets Limited Flexible M:N redundancy mechanism for packet inspection engine
US7957377B1 (en) * 2004-07-30 2011-06-07 Cisco Technology, Inc. Reducing and load balancing link-state requests in OSPF
US8004965B2 (en) * 2004-09-28 2011-08-23 Nec Corporation Redundant packet switching system and system switching method of redundant packet switching system
US7573811B2 (en) * 2005-03-28 2009-08-11 Alcatel-Lucent Usa Inc. Network transparent OSPF-TE failover
JP2006285448A (en) * 2005-03-31 2006-10-19 Oki Electric Ind Co Ltd Redundant system
CN100409619C (en) * 2005-07-13 2008-08-06 武汉烽火网络有限责任公司 Data network equipment and its management controlling method
US7583590B2 (en) * 2005-07-15 2009-09-01 Telefonaktiebolaget L M Ericsson (Publ) Router and method for protocol process migration
US8036105B2 (en) * 2005-08-08 2011-10-11 International Business Machines Corporation Monitoring a problem condition in a communications system
US9166904B2 (en) * 2005-09-08 2015-10-20 Cisco Technology, Inc. Method and apparatus for transferring BGP state information during asynchronous startup
US7948873B2 (en) * 2005-10-17 2011-05-24 Cisco Technology, Inc. Method for recovery of a controlled failover of a border gateway protocol speaker
US7518986B1 (en) 2005-11-16 2009-04-14 Juniper Networks, Inc. Push-based hierarchical state propagation within a multi-chassis network device
US8565070B2 (en) * 2005-11-23 2013-10-22 Cisco Technology, Inc. System and method for active geographic redundancy
US8437305B2 (en) * 2005-11-23 2013-05-07 Cisco Technology, Inc. Method for providing home agent geographic redundancy
CN101022451B (en) * 2006-02-14 2014-07-23 杭州华三通信技术有限公司 Connection state synchronizing method in data communication and applied communication node thereof
US7594034B2 (en) * 2006-03-27 2009-09-22 Cisco Technology, Inc. Managing foreign-owned fields in versioned messages
CN1905561B (en) * 2006-08-09 2010-07-28 杭州华三通信技术有限公司 Method for improving flow reliability between two layer network and external network
CN1949700B (en) * 2006-10-09 2010-10-06 华为技术有限公司 Method and apparatus for mixed network protection
US8467383B2 (en) * 2007-05-23 2013-06-18 Cisco Technology, Inc. Stateful switching between reliable transport modules for communicating with an external peer without losing the transport layer connection
EP2043306B1 (en) * 2007-09-28 2015-04-15 Unify GmbH & Co. KG Method for organising network nodes in a packet-oriented network
US8031704B2 (en) * 2007-10-22 2011-10-04 Infinera Corporation Network planning and optimization of equipment deployment
EP2073128B1 (en) * 2007-12-21 2014-04-09 Telefonaktiebolaget LM Ericsson (publ) Technique for interconnecting functional modules of an apparatus
US9210067B1 (en) * 2008-07-11 2015-12-08 Google Inc. Method and apparatus for exchanging routing information
US8006129B2 (en) * 2008-10-03 2011-08-23 Cisco Technology, Inc. Detecting and preventing the split-brain condition in redundant processing units
CN101621819B (en) * 2009-07-24 2012-02-15 中兴通讯股份有限公司 Information synchronization detection method for active-standby switching interface module, network element system and link
US8154992B2 (en) * 2009-08-11 2012-04-10 Google Inc. System and method for graceful restart
US8363549B1 (en) 2009-09-02 2013-01-29 Juniper Networks, Inc. Adaptively maintaining sequence numbers on high availability peers
US8483049B2 (en) * 2010-03-29 2013-07-09 Futurewei Technologies, Inc. System and method for communications system routing component level high availability
FI20105878A (en) * 2010-08-24 2012-02-25 Tellabs Oy Security of the network element of the communication network
US8402453B2 (en) * 2010-09-22 2013-03-19 Telefonaktiebolaget L M Ericsson (Publ) In-service software upgrade of control and line cards of network element
CN102571391B (en) * 2010-12-22 2014-12-10 中兴通讯股份有限公司 Method and system for status synchronization of protection switching protocol
US8995303B1 (en) * 2011-03-11 2015-03-31 Amazon Technologies, Inc. Coordinated routing of network traffic
US8842775B2 (en) * 2011-08-09 2014-09-23 Alcatel Lucent System and method for power reduction in redundant components
US20130073741A1 (en) * 2011-09-16 2013-03-21 Alfred C. Lindem, III Ospf nsr with delayed neighbor synchronization
US8913485B2 (en) 2011-09-16 2014-12-16 Telefonaktiebolaget L M Ericsson (Publ) Open shortest path first (OSPF) nonstop routing (NSR) with link derivation
US8923312B2 (en) 2011-09-29 2014-12-30 Telefonaktiebolaget L M Ericsson (Publ) OSPF nonstop routing synchronization nack
US8958430B2 (en) 2011-09-29 2015-02-17 Telefonaktiebolaget L M Ericsson (Publ) OSPF non-stop routing frozen standby
US8964758B2 (en) * 2011-09-29 2015-02-24 Telefonaktiebolaget L M Ericsson (Publ) OSPF nonstop routing (NSR) synchronization reduction
US8885562B2 (en) 2012-03-28 2014-11-11 Telefonaktiebolaget L M Ericsson (Publ) Inter-chassis redundancy with coordinated traffic direction
CN103581013B (en) * 2012-07-25 2017-02-15 杭州华三通信技术有限公司 Method and device for achieving non-stop routing of routing protocol
CN102937906B (en) * 2012-10-31 2015-09-16 中兴通讯股份有限公司 A kind of patch software upgrade method and system
CN105323172B (en) * 2014-07-18 2020-07-14 中兴通讯股份有限公司 Data transmission method and equipment based on unnumbered IP technology
WO2017168217A1 (en) * 2016-03-28 2017-10-05 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for adaptive flow control of link-state information from link-state source to border gateway protocol (bgp)
CN106656835A (en) * 2016-11-16 2017-05-10 上海红阵信息科技有限公司 Parallel single present system of multiple OSPF protocol execution units
US11669076B2 (en) * 2018-07-27 2023-06-06 Rockwell Automation Technologies, Inc. System and method of communicating unconnected messages over high availability industrial control systems
US11095528B2 (en) * 2019-05-09 2021-08-17 International Business Machines Corporation Identity network onboarding based on confidence scores
CN110601985B (en) * 2019-09-17 2022-03-29 北京东土军悦科技有限公司 Interface configuration information switching method, device, equipment and storage medium
CN111083074A (en) * 2019-12-20 2020-04-28 盛科网络（苏州）有限公司 High availability method and system for main and standby dual OSPF state machines
CN111371680B (en) * 2020-03-04 2022-04-29 深信服科技股份有限公司 Route management method, device, equipment and storage medium for dual-computer hot standby
CN114205285B (en) * 2021-11-24 2024-01-05 中盈优创资讯科技有限公司 OSPF route selecting method and device based on link quality

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4466098A (en) 1982-06-11 1984-08-14 Siemens Corporation Cross channel circuit for an electronic system having two or more redundant computers
US5621721A (en) 1995-01-12 1997-04-15 Stratacom, Inc. Maintaining database integrity throughout a communication network
US5835696A (en) 1995-11-22 1998-11-10 Lucent Technologies Inc. Data router backup feature
JP3603524B2 (en) 1997-02-05 2004-12-22 株式会社日立製作所 Networking method
US6351775B1 (en) * 1997-05-30 2002-02-26 International Business Machines Corporation Loading balancing across servers in a computer network
US6148410A (en) * 1997-09-15 2000-11-14 International Business Machines Corporation Fault tolerant recoverable TCP/IP connection router
JP3286584B2 (en) * 1997-11-20 2002-05-27 株式会社日立製作所 Multiplexed router device
US6195705B1 (en) * 1998-06-30 2001-02-27 Cisco Technology, Inc. Mobile IP mobility agent standby protocol
US6173324B1 (en) 1998-07-15 2001-01-09 At&T Corp Method and apparatus for fault detection and isolation in data
US6427213B1 (en) * 1998-11-16 2002-07-30 Lucent Technologies Inc. Apparatus, method and system for file synchronization for a fault tolerate network
US6424629B1 (en) 1998-11-23 2002-07-23 Nortel Networks Limited Expediting reconvergence in a routing device
US6556547B1 (en) * 1998-12-15 2003-04-29 Nortel Networks Limited Method and apparatus providing for router redundancy of non internet protocols using the virtual router redundancy protocol
AU3216100A (en) 1999-02-16 2000-09-04 Eci Telecom Ltd. System for hot standby of a telephone switching matrix
US6397260B1 (en) * 1999-03-08 2002-05-28 3Com Corporation Automatic load sharing for network routers
US6392990B1 (en) * 1999-07-23 2002-05-21 Glenayre Electronics, Inc. Method for implementing interface redundancy in a computer network
US6430622B1 (en) * 1999-09-22 2002-08-06 International Business Machines Corporation Methods, systems and computer program products for automated movement of IP addresses within a cluster
US6351755B1 (en) 1999-11-02 2002-02-26 Alta Vista Company System and method for associating an extensible set of data with documents downloaded by a web crawler
US6941377B1 (en) * 1999-12-31 2005-09-06 Intel Corporation Method and apparatus for secondary use of devices with encryption
US6601101B1 (en) * 2000-03-15 2003-07-29 3Com Corporation Transparent access to network attached devices
US6529481B2 (en) * 2000-11-30 2003-03-04 Pluris, Inc. Scalable and fault-tolerant link state routing protocol for packet-switched networks
US7234001B2 (en) * 2000-12-20 2007-06-19 Nortel Networks Limited Dormant backup link for OSPF network protection
US6820134B1 (en) * 2000-12-28 2004-11-16 Cisco Technology, Inc. Optimizing flooding of information in link-state routing protocol
US6983294B2 (en) * 2001-05-09 2006-01-03 Tropic Networks Inc. Redundancy systems and methods in communications systems
US7065059B1 (en) * 2001-08-09 2006-06-20 Cisco Technology, Inc. Technique for restoring adjacencies in OSPF in a non-stop forwarding intermediate node of a computer network
US6950427B1 (en) * 2001-08-09 2005-09-27 Cisco Technology, Inc. Technique for resynchronizing LSDB in OSPF after a software reload in a non-stop forwarding intermediate node of a computer network
US6959334B1 (en) * 2001-09-14 2005-10-25 Bellsouth Intellectual Property Corporation Backup logical port service
US7292535B2 (en) * 2002-05-23 2007-11-06 Chiaro Networks Ltd Highly-available OSPF routing protocol
US6954794B2 (en) * 2002-10-21 2005-10-11 Tekelec Methods and systems for exchanging reachability information and for switching traffic between redundant interfaces in a network cluster

Also Published As

Publication number Publication date
US7490161B2 (en) 2009-02-10
US20030056138A1 (en) 2003-03-20
EP1352335A1 (en) 2003-10-15
WO2003023637A1 (en) 2003-03-20
JP2005503055A (en) 2005-01-27
CN1610898A (en) 2005-04-27
EP1352335A4 (en) 2008-09-24
CN1311381C (en) 2007-04-18
CA2427285C (en) 2010-02-02

Similar Documents

Publication Publication Date Title
CA2427285A1 (en) Method and system for implementing ospf redundancy
US7155632B2 (en) Method and system for implementing IS-IS protocol redundancy
US7292535B2 (en) Highly-available OSPF routing protocol
US7236453B2 (en) High available method for border gateway protocol version 4
US7573811B2 (en) Network transparent OSPF-TE failover
US7269133B2 (en) IS-IS high availability design
US7317731B2 (en) System and method for distributed resource reservation protocol-traffic engineering (RSVP-TE) hitless restart in multi-protocol label switching (MPLS) network
US6262977B1 (en) High availability spanning tree with rapid reconfiguration
US20080225699A1 (en) Router and method of supporting nonstop packet forwarding on system redundant network
US7804770B2 (en) Method and apparatus for performing a graceful restart in a NSF-capable router without enhancing link state routing protocols
US7787365B1 (en) Routing protocol failover between control units within a network router
US7342874B2 (en) High-availability packet forwarding apparatus and method
US7155536B2 (en) Fault-tolerant IS-IS routing system, and a corresponding method
CN101164307A (en) Method and gateway equipment for resuming service after switching status of main/standby gateway device
JP2002057682A (en) Network interface changeover method and computer connectable to network
CN105340226B (en) The method and device thereof of the main preparation system switching of dynamic routing equipment
CN102404189A (en) Main and standby switching method of device supporting multi-topology routing as well as master control board
US8483049B2 (en) System and method for communications system routing component level high availability
KR101021278B1 (en) A Device and method for router control plane redundancy by using OSPF
JP3990196B2 (en) How to avoid communication interruption due to spanning tree reconfiguration
JP2005218133A (en) Internetwork connection method, virtual internetwork connection unit, and internetwork connection system using same unit
JP2005175931A (en) Communication route setting method
JP2005204239A (en) Communication switching method and data communication apparatus

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20200831