Smart resync of data between a network management system and a network element

• US 20060028979A1
• Filed: 08/06/2004
• Published: 02/09/2006
• Est. Priority Date: 08/06/2004
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sharma, Anurag, Goricanec, Drago, Damojipurapu, Vijay, Singhani, Ajay, Levesque, Gilbert
• Granted Patent: US 7,573,808 B2
• Time in Patent Office: Days
• US Class Current: 370/229
• CPC Class Codes: H04L 41/0654 using network fault recovery ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437
• CPC Class Codes: H04L 41/0816 the condition being an adaptation, e.g. in response to network events
• CPC Class Codes: H04L 41/0826 for reduction of network costs H04L41/0833 takes precedence

Abstract

Network recovery of multiple NEs, such as at NMS restart, or at re-establishment of communication after loss of communication with the NMS that provides reduced cost and reduced the elapsed time before the NMS can start performing network monitoring. A method of recovering data from a network element at a network management system comprises the steps of determining whether a data buffer of the network element is valid, if the data buffer of the network element is valid, determining whether the data buffer of the network element contains a database change event not received by the network management system, if the data buffer of the network element is not valid or if the data buffer of the network element contains a database change event not received by the network management system, indicating that the data buffer of the network element is out-of-sync with the network management system, and if the data buffer of the network element is valid and if the data buffer of the network element does not contains a database change event not received by the network management system, indicating that the data buffer of the network element is in sync with the network management system.

Claims

1. A method of recovering data from a network element at a network management system comprising the steps of:

determining whether a data buffer of the network element is valid;

if the data buffer of the network element is valid, determining whether the data buffer of the network element contains a database change event not received by the network management system;

if the data buffer of the network element is not valid or if the data buffer of the network element contains a database change event not received by the network management system, indicating that the data buffer of the network element is out-of-sync with the network management system; and

if the data buffer of the network element is valid and if the data buffer of the network element does not contains a database change event not received by the network management system, indicating that the data buffer of the network element is in sync with the network management system.

2. The method of claim 1, wherein the step of determining whether a data buffer of the network element is valid comprises the steps of:

determining whether a last event of the network element received by the network management system from the network element is present in the data buffer of the network element; and

if the last event received by the network management system from the network element is present in the data buffer of the network element, determining that the data buffer of the network element is valid.

3. At a network management system, a method of recovering operations of a network comprising a plurality of network elements, the method comprising the steps of:

logging in to each of the plurality of network elements;

after logging in to each of the plurality of network elements, recovering active faults from each of the plurality of network elements; and

after recovering active faults from each of the plurality of network elements, recovering data from each of the plurality of network elements.

4. The method of claim 3, further comprising the step of:

after logging in to a network element, but before logging in to all of the plurality of network elements, performing on the network element operations that only require connectivity to the network element.

5. The method of claim 4, further comprising the step of:

after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements, monitoring the network element for additional faults and alarms.

6. The method of claim 5, further comprising the step of:

after recovering data from the network element, but before recovering data from all of the plurality of network elements, resuming network operations with the network element.

7. The method of claim 3, wherein the step of recovering data from each of the plurality of network elements comprises, for each network element, the steps of:

determining whether a data buffer of the network element is valid;

if the data buffer of the network element is valid, determining whether the data buffer of the network element contains a database change event not received by the network management system;

if the data buffer of the network element is not valid or if the data buffer of the network element contains a database change event not received by the network management system, indicating that the data buffer of the network element is out-of-sync with the network management system; and

if the data buffer of the network element is valid and if the data buffer of the network element does not contains a database change event not received by the network management system, indicating that the data buffer of the network element is in sync with the network management system.

8. The method of claim 7, wherein the step of determining whether a data buffer of the network element is valid comprises the steps of:

determining whether a last event of the network element received by the network management system from the network element is present in the data buffer of the network element; and

if the last event received by the network management system from the network element is present in the data buffer of the network element, determining that the data buffer of the network element is valid.

9. The method of claim 8, further comprising the step of:

after logging in to the network element, but before logging in to all of the plurality of network elements, performing on the network element operations that only require connectivity to the network element.

10. The method of claim 9, further comprising the step of:

after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements, monitoring the network element for additional faults and alarms.

11. The method of claim 10, further comprising the step of:

after recovering data from the network element, but before recovering data from all of the plurality of network elements, resuming network operations with the network element.

12. A method of controlling operations of a network management system on a network comprising a plurality of network elements, the method comprising the steps of:

assigning a weight and a priority to each of a plurality of operations to be performed on the network management system;

executing at least one of the plurality of operations based on the weight and priority of the at least one operation, based on the weights and priorities of other operations to be performed, and based on utilization of resources of the network management system by operations that are being executed.

13. The method of claim 12, wherein the executing step comprises the step of:

executing the at least one of the plurality of operations using priority based scheduling with task weighting.

14. The method of claim 12, wherein the executing step comprises the steps of:

scheduling for execution an oldest, highest priority operation for execution from among the plurality of operations to be executed; and

executing the scheduled operation, if sufficient resources of the network management system are available to execute the scheduled operation.

15. The method of claim 14, further comprising the step of:

determining whether sufficient resources of the network management system are available to execute the scheduled operation based on a weight of the scheduled operations and on weights of the operations that are being executed.

16. The method of claim 15, wherein the plurality of operations to be executed by the network management system comprises:

logging in to each of the plurality of network elements;

after logging in to each of the plurality of network elements, recovering active faults from each of the plurality of network elements; and

after recovering active faults from each of the plurality of network elements, recovering data from each of the plurality of network elements.

17. The method of claim 16, further comprising the step of:

after logging in to a network element, but before logging in to all of the plurality of network elements, performing on the network element operations that only require connectivity to the network element.

18. The method of claim 17, further comprising the step of:

after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements, monitoring the network element for additional faults and alarms.

19. The method of claim 18, further comprising the step of:

after recovering data from the network element, but before recovering data from all of the plurality of network elements, resuming network operations with the network element.

20. The method of claim 16, wherein the step of recovering data from each of the plurality of network elements comprises, for each network element, the steps of:

determining whether a data buffer of the network element is valid;

if the data buffer of the network element is valid, determining whether the data buffer of the network element contains a database change event not received by the network management system;

if the data buffer of the network element is not valid or if the data buffer of the network element contains a database change event not received by the network management system, indicating that the data buffer of the network element is out-of-sync with the network management system; and

if the data buffer of the network element is valid and if the data buffer of the network element does not contains a database change event not received by the network management system, indicating that the data buffer of the network element is in sync with the network management system.

21. The method of claim 20, wherein the step of determining whether a data buffer of the network element is valid comprises the steps of:

determining whether a last event of the network element received by the network management system from the network element is present in the data buffer of the network element; and

if the last event received by the network management system from the network element is present in the data buffer of the network element, determining that the data buffer of the network element is valid.

22. The method of claim 21, further comprising the step of:

after logging in to the network element, but before logging in to all of the plurality of network elements, performing on the network element operations that only require connectivity to the network element.

23. The method of claim 22, further comprising the step of:

after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements, monitoring the network element for additional faults and alarms.

24. The method of claim 23, further comprising the step of:

after recovering data from the network element, but before recovering data from all of the plurality of network elements, resuming network operations with the network element.

25. A network management system operable to recovering data from a network element comprising:

circuitry operable to determine whether a data buffer of the network element is valid;

circuitry operable to determine whether the data buffer of the network element contains a database change event not received by the network management system, if the data buffer of the network element is valid;

circuitry operable to indicate that the data buffer of the network element is out-of-sync with the network management system, if the data buffer of the network element is not valid or if the data buffer of the network element contains a database change event not received by the network management system; and

circuitry operable to indicate that the data buffer of the network element is in sync with the network management system, if the data buffer of the network element is valid and if the data buffer of the network element does not contains a database change event not received by the network management system.

26. The system of claim 25, wherein the circuitry operable to determine whether a data buffer of the network element is valid comprises:

circuitry operable to determine whether a last event of the network element received by the network management system from the network element is present in the data buffer of the network element; and

circuitry operable to determine that the data buffer of the network element is valid, if the last event received by the network management system from the network element is present in the data buffer of the network element.

27. A network management system operable to recover operations of a network comprising a plurality of network elements, the system comprising:

circuitry operable to log in to each of the plurality of network elements;

circuitry operable to recover active faults from each of the plurality of network elements, after logging in to each of the plurality of network elements; and

circuitry operable to recover data from each of the plurality of network elements, after recovering active faults from each of the plurality of network elements.

28. The system of claim 27, further comprising:

circuitry operable to perform on a network element operations that only require connectivity to the network element, after logging in to the network element, but before logging in to all of the plurality of network elements.

29. The system of claim 28, further comprising:

circuitry operable to monitor the network element for additional faults and alarms after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements.

30. The system of claim 29, further comprising:

circuitry operable to resume network operations with the network element, after recovering data from the network element, but before recovering data from all of the plurality of network elements.

31. The system of claim 30, wherein the circuitry operable to recover data from each of the plurality of network elements is further operable to, for each network element:

determine whether a data buffer of the network element is valid;

if the data buffer of the network element is valid, determine whether the data buffer of the network element contains a database change event not received by the network management system;

if the data buffer of the network element is not valid or if the data buffer of the network element contains a database change event not received by the network management system, indicate that the data buffer of the network element is out-of-sync with the network management system; and

if the data buffer of the network element is valid and if the data buffer of the network element does not contains a database change event not received by the network management system, indicate that the data buffer of the network element is in sync with the network management system.

32. The system of claim 31, wherein circuitry operable to recover data from each of the plurality of network elements is operable to determine whether a data buffer of the network element is valid by:

determining whether a last event of the network element received by the network management system from the network element is present in the data buffer of the network element; and

if the last event received by the network management system from the network element is present in the data buffer of the network element, determining that the data buffer of the network element is valid.

33. The system of claim 32, wherein the circuitry operable to recover data from each of the plurality of network elements is further operable to:

after logging in to the network element, but before logging in to all of the plurality of network elements, perform on the network element operations that only require connectivity to the network element.

34. The system of claim 33, wherein the circuitry operable to recover data from each of the plurality of network elements is further operable to:

after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements, monitor the network element for additional faults and alarms.

35. The system of claim 34, wherein the circuitry operable to recover data from each of the plurality of network elements is further operable to:

after recovering data from the network element, but before recovering data from all of the plurality of network elements, resume network operations with the network element.

36. A network management system on a network comprising a plurality of network elements, the system comprising:

circuitry operable to control operations of the network management system by;

assigning a weight and a priority to each of a plurality of operations to be performed on the network management system;

executing at least one of the plurality of operations based on the weight and priority of the at least one operation, based on the weights and priorities of other operations to be performed, and based on utilization of resources of the network management system by operations that are being executed.

37. The system of claim 36, wherein the circuitry is operable to execute at least one of the plurality of operations by:

executing the at least one of the plurality of operations using priority based scheduling with task weighting.

38. The system of claim 36, wherein the circuitry is operable to execute at least one of the plurality of operations by:

scheduling for execution an oldest, highest priority operation for execution from among the plurality of operations to be executed; and

executing the scheduled operation, if sufficient resources of the network management system are available to execute the scheduled operation.

39. The system of claim 38, wherein the circuitry is further operable to execute at least one of the plurality of operations by:

determining whether sufficient resources of the network management system are available to execute the scheduled operation based on a weight of the scheduled operations and on weights of the operations that are being executed.

40. The system of claim 39, wherein the plurality of operations to be executed by the network management system comprises:

logging in to each of the plurality of network elements;

after logging in to each of the plurality of network elements, recovering active faults from each of the plurality of network elements; and

after recovering active faults from each of the plurality of network elements, recovering data from each of the plurality of network elements.

41. The system of claim 40, wherein the circuitry is further operable to execute at least one of the plurality of operations by:

after logging in to a network element, but before logging in to all of the plurality of network elements, performing on the network element operations that only require connectivity to the network element.

42. The system of claim 41, wherein the circuitry is further operable to execute at least one of the plurality of operations by:

after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements, monitoring the network element for additional faults and alarms.

43. The system of claim 42, wherein the circuitry is further operable to execute at least one of the plurality of operations by:

after recovering data from the network element, but before recovering data from all of the plurality of network elements, resuming network operations with the network element.

44. The system of claim 40, wherein the circuitry is further operable to recover data from each of the plurality of network elements by, for each network element:

determining whether a data buffer of the network element is valid;

if the data buffer of the network element is valid, determining whether the data buffer of the network element contains a database change event not received by the network management system;

if the data buffer of the network element is not valid or if the data buffer of the network element contains a database change event not received by the network management system, indicating that the data buffer of the network element is out-of-sync with the network management system; and

if the data buffer of the network element is valid and if the data buffer of the network element does not contains a database change event not received by the network management system, indicating that the data buffer of the network element is in sync with the network management system.

45. The system of claim 44, wherein the circuitry is further operable to determine whether a data buffer of the network element is valid by:

determining whether a last event of the network element received by the network management system from the network element is present in the data buffer of the network element; and

if the last event received by the network management system from the network element is present in the data buffer of the network element, determining that the data buffer of the network element is valid.

46. The system of claim 45, wherein the circuitry is further operable to execute at least one of the plurality of operations by:

after logging in to the network element, but before logging in to all of the plurality of network elements, performing on the network element operations that only require connectivity to the network element.

47. The system of claim 46, wherein the circuitry is further operable to execute at least one of the plurality of operations by:

after recovering active faults from the network element, but before recovering active faults from all of the plurality of network elements, monitoring the network element for additional faults and alarms.

48. The system of claim 47, wherein the circuitry is further operable to execute at least one of the plurality of operations by:

after recovering data from the network element, but before recovering data from all of the plurality of network elements, resuming network operations with the network element.