CA2493525A1 - Method and apparatus for outage measurement - Google Patents

Method and apparatus for outage measurement Download PDF

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Publication number
CA2493525A1
CA2493525A1 CA002493525A CA2493525A CA2493525A1 CA 2493525 A1 CA2493525 A1 CA 2493525A1 CA 002493525 A CA002493525 A CA 002493525A CA 2493525 A CA2493525 A CA 2493525A CA 2493525 A1 CA2493525 A1 CA 2493525A1
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Canada
Prior art keywords
outage
processing device
outages
network processing
network
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Granted
Application number
CA002493525A
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French (fr)
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CA2493525C (en
Inventor
Jiandong Huang
Sejun Song
Madhav Marathe
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Cisco Technology Inc
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Cisco Technology, Inc.
Jiandong Huang
Sejun Song
Madhav Marathe
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Priority to CA2783206A priority Critical patent/CA2783206C/en
Publication of CA2493525A1 publication Critical patent/CA2493525A1/en
Application granted granted Critical
Publication of CA2493525C publication Critical patent/CA2493525C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
    • H04L41/064—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis involving time analysis
    • 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
    • H04L41/0604—Management of faults, events, alarms or notifications using filtering, e.g. reduction of information by using priority, element types, position or time
    • 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
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
    • 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
    • H04L41/02—Standardisation; Integration
    • H04L41/0213—Standardised network management protocols, e.g. simple network management protocol [SNMP]
    • 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
    • H04L41/04—Network management architectures or arrangements
    • H04L41/044—Network management architectures or arrangements comprising hierarchical management structures
    • 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
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps

Abstract

An Outage Measurement System (OMS) monitors and measures outage data at a network processing device. The outage data can be stored in the device and transferred to a Network Management System (NMS) or other correlation tool for deriving outage information. The OMS automates the outage measurement process and is more accurate, efficient and cost effective than pervious outage measurement systems.

Claims (69)

1. A method for detecting outages, comprising:
automatically measuring outages using an outage measurement system located locally in a network processing device.
2. A method according to claim 1 including measuring outages for devices directly attached to the network processing device using the outage measurement system.
3. A method according to claim 1 including measuring outages for local objects in the network processing device.
4. A method according to claim 1 including storing outage data locally in the network processing device.
5. A method according to claim 4 including using a persistent memory device for storing the outage data.
6. A method according to claim 4 including storing the outage data in a Management Information Base (MIB).
7. A method according to claim 6 including using a Simple Network Management Protocol (SNMP) to transfer the outage data in the MIB.
8. A method according to claim 1 including transferring the outage data to a network management system or upper level tool for correlating.
9. A method according to claim 1 including polling for layer-2 outages with the outage measurement system.
10. A method according to claim 1 including polling for layer-3 outages with the outage measurement system.
11. A method according to claim 1 including automatically discovering devices connect to the local network processing device and automatically polling for outages associated with the discovered devices.
12. A method according to claim 1 including:
receiving configuration data from a network management system at the network processing device; and automatically monitoring for outages with the outage measurement system according to the received configuration data.
13. A method according to claim 12 including retaining the configuration data in a configuration table located in the network processing device.
14. A method according to claim 1 including filtering the local outage data with the outage measurement system.
15. A method for measuring outages in a network, comprising:

identifying single point of failure devices in the network;
selectively locating outage measurement systems in the identified single point of failure devices; and automatically testing for outages locally in the selected single point of failure devices using the outage measurement systems.
16. A method according to claim 15 including:
storing outage data for the outages in the identified devices;
correlating the outage data with one or more correlation systems; and identifying outage statistics according to the correlated outage data.
17. A method according to claim 16 wherein one or more of the correlation systems are located on a network management system remote from the identified devices.
18. A method according to claim 15 including polling for layer-2 outages using the outage measurement systems and polling for layer-3 outages according to results of the layer-2 polling.
19. A method according to claim 18 including using a combination of the polled layer-2 and layer-3 outages to distinguish between local outages local to the identified devices and remote outages associated with links or devices connected to the identified devices.
20. A method for identifying outages, comprising:
monitoring traffic statistics locally at a network processing device for objects associated with the network processing device; and using the traffic statistics to identify outages for the objects.
21. A method according to claim 20 including monitoring link status of objects associated with the network processing device and detecting outages according to the monitored traffic statistics and monitored link status.
22. A method according to claim 21 including;
pinging remote devices connected to the network processing device;
monitoring the results of the pinging; and detecting outages according to the monitored traffic statistics, monitored link status and monitored pinging.
23. A method according to claim 20 including monitoring utilization of a processor in the network processing device and using the monitored utilization to identifying Denial Of Service (DOS) conditions in the network processing device.
24. A method for identifying outages, comprising:
polling for local outages of local objects at the network processing device;
polling for remote outages of remote objects connected to the network processing device; and comparing the local outages with the remote outages to distinguish between outages caused by the local objects and outages caused by the remote objects.
25. A method according to claim 24 including polling for the remote outages by pinging the remote objects with test packets.
26. A method according to claim 24 including:
deriving an Accumulated Outage Time (AOT) for the local objects;
deriving an Accumulated Outage Time (AOT) for the remote objects; and distinguishing local object outages from remote object outages by comparing the AOT for the local objects with the AOT for the remote objects.
27. A method according to claim 24 wherein the local objects include local physical and logical interfaces, a local line card, or a local router processor.
28. A method according to claim 24 wherein the remote objects include a remote peer router or remote customer equipment.
29. A method for identifying outages, comprising:
identifying outage events locally at a network processing device; and providing the outage events to a Network Management Server (NMS) or a correlation tool for outage analysis.
30. A method according to claim 29 including storing outage data for the outage events locally in the network processing device at least until the outage data is provided to the NMS or correlation tool.
31. A method according to claim 30 including storing the outage data in an outage Management Information Base (MIB).
32 32. A method according to claim 29 including polling for the outage events according to a configuration file sent from the NMS.
33. A method according to claim 32 including modifying which outage events are monitored in the network processing device according to commands sent from the NMS.
34. A method according to claim 29 including storing an object outage table in the network processing device that identifies which objects to poll for outages.
35. A method according to claim 34 including:
automatically discovering remote devices connected to the network processing device; and automatically updating the object outage table with the discovered remote devices.
36. A method according to claim 29 including:
filtering the outage events identified at the network processing device; and sending the filtered events to the network management system or correlation tool.
37. A method for network outage monitoring, comprising:
monitoring for outages associated with a configuration of devices connected to a network processing device;

automatically discovering a new configuration of devices connected to the network processing device; and dynamically updating outage monitoring according to the new configuration of devices.
38. A method according to claim 37 including using a Cisco Discovery Protocol (CDP), Address Resolution Protocol (ARP) protocol, or Internet Control Message Protocol (ICMP) for automatically discovering the new configuration of devices.
39. A method according to claim 37 including:
storing a configuration table identify devices connected to the network processing device; and automatically updating the configuration table with the new configuration of devices.
40. A network processing device, comprising:
a processor configured to manage outage monitoring for objects associated with the network processing device.
41. A network processing device according to claim 40 including memory for storing outage data for the monitored objects.
42. A network processing device according to claim 41 wherein the memory comprises a persistent storage of outage monitoring data when the network processing device loses power.
43. A network processing device according to claim 40 wherein the outage data is stored in a Management Information Base (MIB).
44. A network processing device according to claim 41 wherein the processor monitors for outages by monitoring local objects within the network processing devices.
45. A network processing device according to claim 44 wherein the local objects are associated with a muter processor, line card, or software program within the network processing device.
46. A network processor according to claim 40 wherein the processor initiates pinging of test packets to neighboring devices connected to the network processing device according to outage monitoring results.
47. A network processing device according to claim 40 wherein the processor automatically discovers objects coupled to the network processing device and automatically polls for outages of the discovered objects.
48. A network processing device according to claim 40 wherein the processor determines Accumulated Outage Time (AOT) or Number of Accumulate Failures (NAF) for the monitored objects.
49. A network processing device according to claim 40 including a backup processor and an associated backup memory, the processor storing data from outage monitoring in both the backup memory.
50. A method for measuring outages, comprising:
locally monitoring for outages at a network processing device;
filtering the monitored outages with the local network processing device; and sending the filtered outages to an outage correlation system.
51. A method according to claim 50 including calculating an Accumulated Outage Time (AOT) outage parameter or a Number of Accumulated Failures (NAF) outage parameter from the monitored outages and sending the AOT or NAF to the correlation system.
52. A method according to claim 51 including deriving a Mean Time Between Failures or a Mean Time To Repair value from the AOT or NAF parameters with the correlation system.
53. A method according to claim 50 including:
identifying different outages associated with a same line card;
filtering the different line card outages into a single line card outage indication; and sending the single line card outage indication to the outage correlation system.
54. A method according to claim 50 including filtering the monitored outages from a system log file.
55. A method for measuring an outage for a network processor device, comprising:
generating a time stamp for the network processing device;
storing the time stamp locally in the network processing device;
periodically updating the stored time stamp with a most recent time stamp for the network processing device;
retaining the most recent stored time stamp during a network processing device outage; and using the retained most recent stored time stamp to determine an outage time for the network processing device.
56. A method according to claim 55 including;
identifying a system up time when the network processing device has recovered from the outage; and comparing the stored time stamp with the system up time to determine the outage time.
57. A method according to claim 55 including periodically storing the most recent time stamp in a persistent memory.
58. A method according to claim 55 wherein the outage comprises a power loss to the network processing device.
59. A method according to claim 55 wherein the time stamp stored in the network processing device is updated about once every minute.
60. An electronic storage medium for storing computer executable code for detecting outages, the computer executable code comprising:
code for automatically measuring outages using an outage measurement system located locally in a network processing device.
61. An electronic storage medium according to claim 60 including code for storing outage data locally in the network processing device.
62. An electronic storage medium according to claim 60 including code for transferring the outage data to a network management system or upper level tool for correlating.
63. An electronic storage medium according to claim 60 including code for automatically discovering devices connect to the local network processing device and automatically polling for outages associated with the discovered devices.
64. An electronic storage medium according to claim 60 including:
code for receiving configuration data from a network management system at the network processing device; and code for automatically monitoring for outages with the outage measurement system according to the received configuration data.
65. A system for detecting outages, comprising:
means for automatically measuring outages using an outage measurement system located locally in a network processing device.
66. A system according to claim 65 including means for storing outage data locally in the network processing device.
67. A system according to claim 65 including means for transferring the outage data to a network management system or upper level tool for correlating.
68. A system according to claim 65 including means for automatically discovering devices connected to the local network processing device and automatically polling for outages associated with the discovered devices.
69. A system according to claim 65 including:
means for receiving configuration data from a network management system at the network processing device; and means for automatically monitoring for outages with the outage measurement system according to the received configuration data.
CA2493525A 2002-07-30 2003-07-30 Method and apparatus for outage measurement Expired - Lifetime CA2493525C (en)

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US10/209,845 2002-07-30
US10/209,845 US7149917B2 (en) 2002-07-30 2002-07-30 Method and apparatus for outage measurement
PCT/US2003/023878 WO2004012395A2 (en) 2002-07-30 2003-07-30 Method and apparatus for outage measurement

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EP (1) EP1525713B1 (en)
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