System and method for fault notification and correlation

• US 7,100,095 B2
• Filed: 02/24/2003
• Issued: 08/29/2006
• Est. Priority Date: 02/22/2002
• Status: Active Grant

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Nichols, Geoff, Godse, Dhananjay, Kwan, Louie
• Primary Examiner(s): Knight, Anthony
• Assistant Examiner(s): Norton, Jennifer L.
• Application Number:
  US10/374,671
• Publication Number:
  US 20040078629A1
• Time in Patent Office: 1,282 Days
• Field of Search: 714/57, 718/102, 718/105, 709/208, 709/209, 709/210, 709/223, 709/224, 709/706, 709/714, 700/28
• US Class Current: 714/48
• CPC Class Codes: H04M 3/08 Indicating faults in circuits or apparatus
• CPC Class Codes: H04M 3/2209 for lines also used for data transmission
• CPC Class Codes: H04M 3/30 for subscriber's lines , for the local loop

Abstract

In a communications network, a system and method for fault notification and correlation. The system includes a notification collector that serves as an intermediary for processing fault notifications. If the fault notification volume exceeds a defined threshold, such that in the prior art could involve dropped notifications, the notification collector processes the critical fault notifications. The notification collector may also assign a higher priority to processing the fault notifications than the faulty components do for generating the fault notifications. In this manner, the need for a fault correlation subsystem is reduced.

Claims

1. A network fault management system for reporting and correlating network faults, comprising:

a local notification collector for receiving fault notifications generated by managed entities;

said managed entities include distinct components and sub-systems;

said local notification collector is a local network component which is programmable to avoid fault notification flooding by programming its task priority setting to a higher task priority than all other tasks that generate fault notifications thereby preventing managed entities from generating fault notifications while said notification collector is processing a fault notification,

each of said managed entities includes its own identity,

a state change occurs when one of said managed entities goes from a fully functioning state to a fault state,

when a state change of a managed entity occurs, notification of the state change and the identity of said managed entity are transmitted to said notification collector,

when a state change of a managed entity occurs, said managed entity sends a state change message to all dependant managed entities that depend on said managed entity along with the identity of the managed entity which was the root cause of the fault state,

said notification collector sends notifications of state change to a management system, and

said notification collector includes a programmable threshold;

said programmable threshold depends upon bandwidth of the communication link, capacity of the management system and amount of notification buffers.

2. The network fault management system as set forth in claim 1, wherein:

when said notification collector sends notifications of state change to said management system, said collector filters said notifications where the identity of said managed entity is not the same as the root cause entity.

3. The network fault management system as set forth in claim 2 wherein:

said management system is programmed to be aware of dependant entities and deduce state changes of dependant entities from the system configuration.

4. The network fault management system as set forth in claim 1 wherein:

said management system includes codified fault correction rules encapsulating managed entities in a directed acyclic state dependency graph.

5. A method of network fault management for reporting and correlating network faults, comprising the steps of:

collecting fault notifications using a local notification collector for receiving fault notifications generated by managed entities wherein said managed entities include distinct components and sub-systems;

programming said local notification collector to avoid fault notification flooding by programming its task priority setting to a higher task priority than all other tasks that generate fault notifications thereby preventing managed entities from generating fault notifications while said notification collector is processing a fault notification,

providing each of said managed entities with its own identity,

a state change occurs when one of said managed entities goes from a fully functioning state to a fault state

notifying of the state change and the identity of said managed entity by transmitting to said notification collector when a state change of a managed entity occurs,

when a state change of a managed entity occurs, sending from said managed entity a state change message to all dependant managed entities that depend on said managed entity along with the identity of the managed entity which was the root cause of the fault state,

sending from said notification collector notifications of state change to a management system, and

said notification collector includes a programmable threshold;

said programmable threshold depends upon bandwidth of the communication link, capacity of the management system and amount of notification buffers.

6. The method of network fault management as set forth in claim 5, wherein:

when said notification collector sends notifications of state change to said management system, said collector filters said notifications where the identity of said managed entity is not the same as the root cause entity.

7. The method of network fault management as set forth in claim 6, further comprising the step of:

programming said management system to be aware of dependant entities and deduce state changes of dependant entities from the system configuration.

8. The method of network fault management as set forth in claim 5, further comprising the step of:

codifying fault correction rules in said management system for encapsulating managed entities in a directed acyclic state dependency graph.