CA2572980A1 - Dynamic forwarding adjacency - Google Patents

Dynamic forwarding adjacency Download PDF

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Publication number
CA2572980A1
CA2572980A1 CA002572980A CA2572980A CA2572980A1 CA 2572980 A1 CA2572980 A1 CA 2572980A1 CA 002572980 A CA002572980 A CA 002572980A CA 2572980 A CA2572980 A CA 2572980A CA 2572980 A1 CA2572980 A1 CA 2572980A1
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CA
Canada
Prior art keywords
tunnel
failed
advertisement message
intermediate node
traffic
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
CA002572980A
Other languages
French (fr)
Other versions
CA2572980C (en
Inventor
Jean Philippe Vasseur
Stefano B. Previdi
David D. Ward
Robert Goguen
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.)
Cisco Technology Inc
Original Assignee
Cisco Technology, Inc.
Jean Philippe Vasseur
Stefano B. Previdi
David D. Ward
Robert Goguen
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 Cisco Technology, Inc., Jean Philippe Vasseur, Stefano B. Previdi, David D. Ward, Robert Goguen filed Critical Cisco Technology, Inc.
Publication of CA2572980A1 publication Critical patent/CA2572980A1/en
Application granted granted Critical
Publication of CA2572980C publication Critical patent/CA2572980C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • 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

Abstract

A technique treats a protected forwarding adjacency (FA) as a dynamic entity in that it allows a backup tunnel associated with the FA to carry traffic for the FA, when it's primary tunnel has failed, up to a predetermined amount of time. If after the predetermined amount of time has elapsed and the FA has not recovered (e.g., the primary tunnel has not been reestablished), a network topology change is automatically triggered causing the network to converge on a new network topology. By triggering the network topology change, a path that is more optimal than the path associated with the backup tunnel may be subsequently determined to carry the traffic.

Claims (19)

1. A method for managing a forwarding adjacency (FA) at an intermediate node in a data network wherein the FA is associated with a primary tunnel spanning one or more data links in the data network and configured to carry traffic for the FA and a backup tunnel spanning one or more data links in the data network and configured to carry traf-fic for the FA in the event the primary tunnel fails, the method comprising the steps of:
determining if the backup tunnel has carried traffic for the FA for a predeter-mined period of time; and if so, triggering a network topology change.
2. A method as defined in claim 1 further comprising the steps of:
detecting a failure of a data link spanned by the primary tunnel; and transferring data destined for the primary tunnel to the backup tunnel.
3. A method as defined in claim 1 wherein the predetermined period of time is based on a history of failures of the primary tunnel.
4. A method as defined in claim 1 wherein the predetermined period of time is based on a history of failures of a data link spanned by the primary tunnel.
5. A method as defined in claim 1 wherein the step of triggering comprises:
generating an advertisement message at the intermediate node wherein the ad-vertisement message indicates the FA has failed.
6. A method as defined in claim 6 wherein the advertisement message indicates the FA has failed by excluding a link information element associated with the FA.
7. A method as defined in claim 6 wherein the advertisement message indicates the FA has failed by indicating a status associated with a FA as failed.
8. A method as defined in claim 6 wherein the advertisement message is an Open Systems Path First (OSPF) link state advertisement (LSA) message.
9. A method as defined in claim 6 wherein the advertisement message is an Inter-mediate-System-to-Intermediate-System (IS-IS) link-state packet message.
10. A method as defined in claim 6 further comprising the step of:
flooding the advertisement message to the intermediate node's neighboring nodes.
11. An intermediate node in a data network comprising:
a link-state data base containing an entry representing a forwarding adjacency (FA) wherein the FA is associated with a primary tunnel configured to carry traffic for the FA and a backup tunnel configured to carry traffic for the FA in the event the pri-mary tunnel fails; and a processor configured to determine if the backup tunnel has carried traffic for the FA for a predetermined period of time and if so, trigger a network topology change.
12. An intermediate node as defined in claim 12 wherein the processor is config-ured to detect a failure with a link associated with the primary tunnel and reroute traffic for the FA onto the backup tunnel.
13. An intermediate node as defined in claim 12 wherein the processor is config-ured to determine the predetermined period of time based on a history of failures of the primary tunnel.
14. An intermediate node as defined in claim 12 wherein the processor is config-ured to generate an advertisement message wherein the advertisement message indi-cates the FA has failed.
15. An intermediate node as defined in claim 15 wherein the advertisement message indicates the FA has failed by excluding a link information element associated with the FA.
16. An intermediate node as defined in claim 15 wherein the advertisement message indicates the FA has failed by indicating a status associated with FA as failed.
17. An apparatus containing a forwarding adjacency (FA) having a primary tunnel and a backup tunnel, the apparatus comprising:
means for determining if the backup tunnel has carried traffic for the FA for a predetermined period of time; and means if so, triggering a network topology change.
18. An apparatus as defined in claim 18 further comprising:
means for generating an advertisement message wherein the advertisement mes-sage indicates the primary tunnel has failed.
19. A computer readable medium comprising computer executable instructions for:
determining if the backup tunnel has carried traffic for the FA for a predeter-mined period of time; and if so, triggering a network topology change.
CA2572980A 2004-07-15 2005-07-14 Dynamic forwarding adjacency Expired - Fee Related CA2572980C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/891,704 US7675848B2 (en) 2004-07-15 2004-07-15 Dynamic forwarding adjacency
US10/891,704 2004-07-15
PCT/US2005/025011 WO2006019925A1 (en) 2004-07-15 2005-07-14 Dynamic forwarding adjacency

Publications (2)

Publication Number Publication Date
CA2572980A1 true CA2572980A1 (en) 2006-02-23
CA2572980C CA2572980C (en) 2012-04-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2572980A Expired - Fee Related CA2572980C (en) 2004-07-15 2005-07-14 Dynamic forwarding adjacency

Country Status (5)

Country Link
US (1) US7675848B2 (en)
EP (1) EP1766821B1 (en)
CN (1) CN1969492B (en)
CA (1) CA2572980C (en)
WO (1) WO2006019925A1 (en)

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Also Published As

Publication number Publication date
US7675848B2 (en) 2010-03-09
EP1766821B1 (en) 2018-02-21
WO2006019925A1 (en) 2006-02-23
CA2572980C (en) 2012-04-17
CN1969492B (en) 2012-01-04
EP1766821A1 (en) 2007-03-28
US20060013125A1 (en) 2006-01-19
CN1969492A (en) 2007-05-23
EP1766821A4 (en) 2013-05-29

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Effective date: 20180716