Network fault isolation

Details Network fault isolation Network fault isolation

1999-05-28

2003-11-25

Baderman, Scott (Department: 2184)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S004110, C714S041000, C714S046000

Reexamination Certificate

active

06654914

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to networks such as communication and data networks and more particularly to isolating faults in such networks.
Communication and data networks are rapidly growing in use and complexity. For example, the number of persons using the Internet to transmit and receive data grows on a daily basis. Also, the persons using the Internet are using it more as more websites are added, and as users become comfortable using more services available on-line such as buying goods, instead of just accessing information. The addition of sources of information and services, such as the ever-increasing number of websites, increases the complexity of the Internet. As the use and complexity of networks increases, so does the number of problems experienced by users.
Network service providers want to reduce the impact of network problems on the users, and the cost of network problems to the service providers. Reducing the impact of problems, such as down-time and inability to access the network or particular information or services in the network, increases the users' desire to use a particular network service provider. Ideally, users never want to have problems with the network. Preferably, they want problems to occur infrequently, and when problems do occur, the users want to have the problem corrected quickly. Reducing the cost to the service provider allows the provider to increase profits and/or services to the users. Costs to the network service providers can be reduced in at least three ways: (1) reducing the cost of isolating a problem, (2) reducing the frequency of the problem, and (3) reducing the cost to correct the problem.
One current technique for isolating problems with communication networks is to have the user call a troubleshooting help line. The user calls the help line and describes the user's problem, e.g., what operations the user is unable to perform and what error messages, if any, the user is receiving. A receptionist or technician analyzes the information provided by the user. The receptionist can tell the user what the problem is for problems not requiring tests to diagnose. If diagnosing the problem requires testing, then the technician performs any needed tests on the network. The technician may have to coordinate with other persons, including the user, to perform the needed tests. The technician relays to the user any action that the user needs to take to correct the problem, and/or any information as to what the problem is and how long it will take to correct the problem, either by the user or by the network service provider.
Another technique for isolating network problems involves monitoring information transmitted through the network and analyzing this information. Typically, a central computer collects the information and presents it to a technician in an understandable format. By analyzing the information, problems with the network can be isolated. This technique, however, typically requires complex techniques for collecting, and/or filtering, and/or presenting the data collected. Also, it may be very difficult to isolate many problems using this technique.
SUMMARY OF THE INVENTION
In general, in one aspect, the invention provides a method including indicating to a network diagnostic unit a problem experienced by a user interacting with the network. Data is transferred between the network diagnostic unit and the user and between the network diagnostic unit and portions of the network other than the user to diagnose a cause of the problem. The method also includes reporting to the user an indication of remedial action for correcting the cause.
Embodiments of this aspect of the invention can include one or more of the following features. Indicating the problem can include the user sending a message, resulting in a failure when sent to the network, to the network diagnostic unit. Diagnosing the problem can include adapting to an improper protocol of the message sent by the user and providing an indication to the user of a proper protocol associated with the message.
In general, in another aspect, the invention provides a method of improving network operations, the method including identifying symptoms of network faults. Causes of the identified symptoms are associated with the symptoms. Costs are associated with combinations of symptoms and causes. A high-cost combination of cause and symptom having a higher associated cost than costs associated with other combinations of causes and symptoms is identified. The cause in the high-cost combination of cause and symptom is targeted for a reduction in the cost associated with the high-cost combination of cause and symptom.
In general, in another aspect, the invention provides a method of improving network operations, the method including indicating symptoms of network faults along a first axis of a chart. Causes of the symptoms are indicated along a second axis of the chart. Costs associated with combinations of the symptoms and the causes are indicated at points of the chart associated with respective combinations of symptoms and causes.
In general, in another aspect, the invention provides a system for use with a data network, the system including multiple diagnostic units each adapted to communicate with the network including to a network user. A central controller is operatively connected to the diagnostic units, the controller being adapted to communicate with and coordinate operations of the diagnostic units, to instruct the diagnostic units to perform tests adapted to help isolate a network fault, and to analyze test results received from a diagnostic unit to attempt to determine the network fault.
Embodiments of this aspect of the invention can include one or more of the following features. The diagnostic units can be distributed at locations throughout the network. The controller can be adapted to instruct multiple diagnostic units to perform concurrent testing. The controller can be adapted to instruct a diagnostic unit to inject test data into the network. The controller can be adapted to instruct a first diagnostic unit to inject test data into the network and a second diagnostic unit to monitor a network response to the test data injected by the first diagnostic unit. A diagnostic unit can be adapted to accept data from a user in a protocol incompatible with a network element to which the data are intended to be sent, to communicate with the network element using a protocol compatible with the network element, and to communicate with the user using a protocol compatible with the protocol of the data from the user. The controller can be adapted to determine operations to instruct a diagnostic unit to perform based on predetermined business priorities.
In general, in another aspect, the invention provides a network diagnostic unit including a processor selectively operatively connected to first and second portions of a data network, the second portion including a network user. The network diagnostic unit also includes processor-readable memory for storing instructions for causing the processor to: receive first data from a given one of the first and second portions of the network; determine second data corresponding to and simulating the first data in a protocol compatible with the portion of the network other than the given portion; and transmit the second data to the portion of the network other than the given portion.
In general, in another aspect, the invention provides a computer program product for use with a computer installed in a communication network including network elements, the computer program product including instructions for causing a computer to: accept data from a source in a source protocol inconsistent with a network element protocol of a selected network element; establish a communication link with the source; and send an indication of the data received from the source to the selected network element in a protocol consistent with the network element protocol.
Embodiments of this aspect of the invention can include further instructi

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