CA2507941A1 - Method for verifying function of redundant standby packet forwarder - Google Patents

Method for verifying function of redundant standby packet forwarder Download PDF

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Publication number
CA2507941A1
CA2507941A1 CA002507941A CA2507941A CA2507941A1 CA 2507941 A1 CA2507941 A1 CA 2507941A1 CA 002507941 A CA002507941 A CA 002507941A CA 2507941 A CA2507941 A CA 2507941A CA 2507941 A1 CA2507941 A1 CA 2507941A1
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CA
Canada
Prior art keywords
test packet
redundant
forwarding plane
plane
packet
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Granted
Application number
CA002507941A
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French (fr)
Other versions
CA2507941C (en
Inventor
Guy C. Fedorkow
Gary S. Muntz
Timothy P. Donahue
Michael E. Wildt
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Cisco Technology Inc
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Individual
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Publication of CA2507941A1 publication Critical patent/CA2507941A1/en
Application granted granted Critical
Publication of CA2507941C publication Critical patent/CA2507941C/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/50—Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications

Abstract

A technique for verifying an intermediate node that employs a forwarding plane (572a, 572b) and optionally a control plane (592a, 592b). A test packet is generated and transferred to the for~warding plane (572a, 572b). Using operational software and hardware, the forwarding plane (572a, 572b) for~wards the test packet to a line card (512a, 512b), which in turn "loops" (700a, 700b, 700c) the test packet back to the forwarding-plane (572a, 572b). Using operational software and hardware, the forwarding plane (572a, 572b) pro~cesses the looped-back test packet including forwarding the packet to a destination, such as a control plane (592a, 592b), where the looped-back test packet is verified.

Claims (28)

1. In an intermediate node comprising one or more active forwarding planes and one or more redundant forwarding planes coupled to one or more target line cards, a method for verifying the intermediate node comprising the steps of:
generating a test packet;
transferring the test packet to a redundant forwarding plane;
verifying the operational state of the redundant forwarding plane by using op-erational software and hardware contained in the redundant forwarding plane to for ward the test packet from the redundant forwarding plane to a target line card; and looping the test packet back from the target line card to the redundant forward-ing plane.
2. A method as defined in claim 1 wherein the intermediate node comprises one or more active control planes and one or more redundant control planes.
3. A method as defined in claim 2 comprising the step of:
verifying the operational state of a redundant control plane by using operational software and hardware contained in the redundant control plane to transfer the test packet from the redundant control plane to the redundant forwarding plane.
4. A method as defined in claim 2 comprising the step of:
verifying the operational state of the redundant forwarding plane by using op-erational software and hardware contained in the redundant forwarding plane to for-ward the looped-back test packet from the redundant forwarding plane to a destination.
5. A method as defined in claim 4 wherein the destination is a redundant control plane.
6. A method as defined in claim 5 comprising the step of:

verifying the operational state of a redundant control plane by using operational software and hardware contained in the redundant control plane to process the looped-back test packet.
7. A method as defined in claim 6 comprising the step of:
examining status associated with the test packet.
8. A method as defined in claim 6 comprising the step of:
examining the contents of the looped-back test packet to ensure it matches the contents of the test packet.
9. A method as defined in claim 6 comprising the steps of:
examining a framer error status associated with the test packet to determine if any framing errors were detected.
10. A method as defined in claim 6 comprising the steps of:
examining a framer error status associated with the test packet to determine if any clocking errors were detected.
11. A method as defined in claim 2 wherein the step of verifying includes the steps of:
acquiring configuration information from an active control plane;
applying the test packet to the configuration information to determine the target line card; and forwarding the packet to the target line card.
12. A method as defined in claim 1 comprising the step of:
configuring the target line card to loop back the test packet.
13. A method as defined in claim 1 wherein the test packet is encapsulated in an internal packet.
14. A method as defined in claim 13 wherein the internal packet contains an identi-fier that indicates the internal packet contains the test packet.
15. A method as defined in claim 14 comprising the steps of:
examining the identifier to determine if it indicates the internal packet contains a test packet; and if the internal packet contains a test packet, dropping the internal packet.
16. A method as defined in claim 13 wherein the internal packet contains a frame check sequence (FCS).
17. A method as defined in claim 16 comprising the step of:
verifying the internal packet using the frame check sequence (FCS).
18. A system comprising:
a redundant forwarding plane configured to verify the operational state of the redundant forwarding plane by using operational software and hardware contained in the redundant forwarding plane to forward a test packet to a line card; and the line card configured to loop the test packet back to the redundant forwarding plane.
19. A system as defined in claim 18 wherein the redundant forwarding plane is con-figured to verify the operational state of the redundant forwarding plane by using the forwarding plane's operational software and hardware to forward the looped-back test packet to a destination.
20. A system as defined in claim 18 comprising:
a redundant control plane configured to verify the operational state of the re-dundant control plane by generating the test packet and using operational software and hardware contained in the redundant control plane to transfer the test packet to the re-dundant forwarding plane.
21. A system as defined in claim 18 wherein the line card is configured to configure the line card to loop back the test packet.
22. A system as defined in claim 18 wherein the line card comprises:
a dispatcher configured to drop the test packet.
23. An apparatus comprising:
means for generating a test packet;
means for transferring the test packet to a redundant forwarding plane;
means for verifying the operational state of the redundant forwarding plane by using operational software and hardware contained in the redundant forwarding plane to forward the test packet from the redundant forwarding plane to a target line card; and means for looping the test packet back from the target line card to the redundant forwarding plane.
24. An apparatus as defined in claim 23 comprising:
means for verifying the operational state of a redundant control plane by using operational software and hardware contained in the redundant control plane to transfer the test packet from the redundant control plane to the redundant forwarding plane.
25. A computer readable medium comprising computer executable instructions for execution in a processor for:
generating a test packet;
transferring the test packet to a redundant forwarding plane; and verifying the operational state of the redundant forwarding plane by using op-erational software and hardware contained in the redundant forwarding plane to for-ward the test packet from the redundant forwarding plane to a target line card.
26. A computer readable medium as defined in claim 25 comprising computer ex-ecutable instructions for execution in a processor for:

verifying the operational state of a redundant control plane by using operational software and hardware contained in the redundant control plane to process a looped-back test packet.
27. A computer readable medium as defined in claim 26 comprising computer ex-ecutable instructions for execution in a processor for:
examining the contents of the looped-back test packet to ensure it matches the contents of the test packet.
28. A computer readable medium as defined in claim 25 comprising computer ex-ecutable instructions for execution in a processor for:
examining status associated with the test packet.
CA2507941A 2002-12-05 2003-12-03 Method for verifying function of redundant standby packet forwarder Expired - Fee Related CA2507941C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/310,305 US7289434B2 (en) 2002-12-05 2002-12-05 Method for verifying function of redundant standby packet forwarder
US10/310,305 2002-12-05
PCT/US2003/038274 WO2004054187A2 (en) 2002-12-05 2003-12-03 Method for verifying function of redundant standby packet forwarder

Publications (2)

Publication Number Publication Date
CA2507941A1 true CA2507941A1 (en) 2004-06-24
CA2507941C CA2507941C (en) 2010-02-23

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CA2507941A Expired - Fee Related CA2507941C (en) 2002-12-05 2003-12-03 Method for verifying function of redundant standby packet forwarder

Country Status (8)

Country Link
US (1) US7289434B2 (en)
EP (1) EP1568172B1 (en)
CN (1) CN100375450C (en)
AT (1) ATE378751T1 (en)
AU (1) AU2003298814B2 (en)
CA (1) CA2507941C (en)
DE (1) DE60317558D1 (en)
WO (1) WO2004054187A2 (en)

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Also Published As

Publication number Publication date
DE60317558D1 (en) 2007-12-27
CN100375450C (en) 2008-03-12
AU2003298814A1 (en) 2004-06-30
US7289434B2 (en) 2007-10-30
ATE378751T1 (en) 2007-11-15
EP1568172B1 (en) 2007-11-14
CA2507941C (en) 2010-02-23
WO2004054187A2 (en) 2004-06-24
EP1568172A2 (en) 2005-08-31
CN1720689A (en) 2006-01-11
WO2004054187A3 (en) 2004-09-23
US20040109418A1 (en) 2004-06-10
AU2003298814B2 (en) 2009-08-27

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