Using objects to discover network information about a remote network having a different network protocol

• US 5,845,081 A
• Filed: 09/03/1996
• Issued: 12/01/1998
• Est. Priority Date: 09/03/1996
• Status: Expired due to Term

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Huo, Chaoying, Rangarajan, Govindarajan
• Primary Examiner(s): Asta, Frank J.
• Assistant Examiner(s): PIERCE, IVAN
• Application Number:
  US08/707,318
• Time in Patent Office: 819 Days
• Field of Search: 395/650, 395/700, 395/726, 395/614, 395/676, 395/200.53, 395/200.54, 395/200.56, 395/200.57, 395/200.55, 370/258
• US Class Current: 709/224
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies

Abstract

The present invention is a method, apparatus and computer program product for discovering the nodes and other network information of a computer network (the target network) from a device or node that is not part of the target network (the discovery node) when the discovery node uses a different network protocol than the target network. The invention involves identifying one or more additional nodes (the target nodes) that have access to network information about the target network and with whom the discovery node can communicate. This target network information can include the identification of nodes which are present on the network, the topology of the network, the services provided by the network or by the nodes on the network, status information as the network changes such as information about network and node events or alarms, etc. The discovery node may also have stored information on the types of nodes, services, and other information which may be found on a network using the network protocol of the target network. The discovery node can use the target nodes to receive target network information in various ways, including requesting information from a target node, invoking target network functionality at a target node or target network node to identify target network information, and accessing target network information previously stored at a target node or target network node. After receiving target network information, the discovery node models it using software objects that are created by the discovery node. These software objects are discovery node representations of target network nodes and objects. The discovery node makes the created objects available as representations of the network information from the target network, and can maintain the accuracy of the represented target network information over time.

Claims

1. A computer-implemented method for discovering information about a first computer network having a plurality of nodes, from a device remote from said first network, wherein said first network uses a first network protocol and said remote device uses a second network protocol different from said first network protocol, said method comprising the steps of:

a) identifying a node with which the remote device can communicate wherein said identified node has access to information about the first network,

b) at the remote device, receiving information about the first network from the identified node wherein said received first network information includes node connection information and node type information for a plurality of first network nodes;

c) at the remote device, retrieving an object model including object type definitions wherein said type definitions are remote device representations of node types for nodes using the first network protocol;

d) at the remote device, creating a plurality of objects representing the received first network information such that each object has a type specified by the retrieved object model; and

e) using the created objects to identify first network nodes accessible from the remote device.

2. The method of claim 1 wherein:

the remote device and the identified node are nodes on a second computer network;

communication between the identified node and the remote device uses the second network protocol; and

the created objects are used to identify first network nodes accessible from the second network.

3. The method of claim 1 wherein the first network information received from the identified node includes node topology and network service information for the first network.

4. The method of claim 1 wherein each created object is a logical representation of node connection and type information for a plurality of first network nodes.

5. The method of claim 1 wherein between steps a) and b) the remote device contacts the identified node and specifies a function to be executed by a first network node, and wherein the first network information received in step b) is in response to said executed function.

6. The method of claim 1 wherein the identified node is a first network node and the received first network information is in response to a first communication from the remote device to the identified node requesting that the identified node transmit first network information to the remote device.

7. The method of claim 6, comprising the further steps of:

f) receiving additional first network information from the identified node to identify changes from previously received first network information; and

g) modifying the created objects to reflect identified changes.

8. The method of claim 7 wherein the additional information is received in response to a second communication from the remote device to the identified node specifying a first time and a second time later than said first time, and wherein said second communication requests that the identified node transmit information at a time later than said second time, said transmitted information to include differences in first network information between said first and second time.

9. The method of claim 7 wherein the additional information is received in response to a second communication transmitted from the remote device to the identified node such that said transmittal requires the satisfaction of at least one condition previously specified at the remote device.

10. The method of claim 7 wherein the additional information includes network status information in the form of network event information and node event information.

11. The method of claim 7 wherein the first network protocol is an IPX network protocol and the identified node provides first network information by using IPX network functionality to collect network information and transmit the collected information to remote devices.

12. The method of claim 7 wherein the second network protocol is an IP network protocol, and the first network protocol does not have the capability to respond to IP network protocol requests for network information.

13. The method of claim 7 wherein the first network is managed from the remote device by using objects representing received first network information to provide functionality to second network nodes, said functionality including first network services and connectivity to first network nodes.

14. An apparatus for discovering information about a first computer network having a plurality of nodes, the apparatus being remotely located from the first network, wherein said first network uses a first network protocol and said apparatus uses a second network protocol different from said first network protocol, said apparatus comprising:

an input component that receives identification of a node such that the apparatus can communicate with said identified node, and scheduling information specifying first network information to be discovered;

a scheduler that creates at least one discovery action corresponding to the identified node and received scheduling information;

an action executer that executes a created discovery action in accordance with the scheduling information corresponding thereto such that the identified node corresponding to the discovery action is contacted using the second network protocol and a transmittal of the specified first network information to the apparatus is arranged;

an importer that receives first network information from the identified node; and

an object modeler that models received first network information and uses modeled information to determine nodes accessible to the apparatus.

15. The apparatus of claim 14 wherein the received scheduling information further specifies conditions under which a corresponding discovery action is to be executed and wherein the apparatus further comprises:

an action monitor that determines when specified conditions of the scheduling information corresponding to the created discovery action are satisfied and notifies the action executer of said determination.

16. The apparatus of claim 14 wherein arrangement of a transmittal of specified first network information during execution of a discovery action is accomplished by requesting that the identified node corresponding to the discovery action transmit the specified first network information.

17. The apparatus of claim 14 wherein arrangement of a transmittal of specified first network information during execution of a discovery action is accomplished by executing a function specific to the first network protocol on the identified node corresponding to the discovery action.

18. The apparatus of claim 14 wherein modeling received first network information involves creating a plurality of objects such that each object has a type specified by a stored object model and said created objects are logical representations of received information for a plurality of first network nodes, and wherein said object model includes object type definitions which represent first network information and are specific to the first network protocol.

19. The apparatus of claim 18 wherein the apparatus further comprises:

an object presenter that uses created objects to determine nodes accessible from the apparatus.

20. A computer system for discovering information about a first computer network having a plurality of nodes, the system being remotely located from the first network, wherein said first network uses a first network protocol and said computer system uses a second network protocol different from said first network protocol, said computer system comprising:

an input component that receives identification of a node such that the computer system can communicate with said identified node, and scheduling information specifying first network information to be discovered;

a scheduler that creates at least one discovery action corresponding to the identified node and received scheduling information;

an action executer that executes a created discovery action in accordance with the scheduling information corresponding thereto such that the identified node corresponding to the discovery action is contacted using the second network protocol and a transmittal of the specified first network information to the computer system is arranged;

an importer that receives first network information from the identified node, including node connection information and node type information for a plurality of first network nodes; and

an object modeler that models received first network information by creating a plurality of objects that represent the received first network information, and uses created objects to identify nodes accessible to the computer system.

21. The computer system of claim 20 wherein:

the computer system is a node on a second computer network;

communication between the identified node and the computer system uses the second network protocol;

each created object is a logical representation of node connection and type information for a plurality of first network nodes; and

the logical representations are nodes identified to be accessible from the second computer network.

22. The computer system of claim 21 wherein:

the first network protocol is IPX;

the second network protocol is IP;

the first network does not have the capability to respond to IP network protocol requests for first network information; and

the identified node provides first network information by using IPX network functionality to collect network information and transmit the collected information to remote devices.

23. An article of manufacture comprising a computer-readable medium and a computer program embodied therein, for discovering information about a first computer network having a plurality of nodes, the computer-readable medium located remotely from the first network, wherein said first network uses a first network protocol and said computer program uses a second network protocol different from said first network protocol, said computer program comprising:

an input functionality that receives identification of a node such that the computer program can communicate with said identified node, and scheduling information specifying first network information to be discovered and conditions under which the discovery of first network information is to be accomplished;

a schedule functionality that creates at least one discovery action corresponding to the identified node and received scheduling information;

an execute functionality that executes a created discovery action in accordance with the scheduling information corresponding thereto such that the identified node corresponding to the discovery action is contacted using the second network protocol and a transmittal of the specified first network information to the computer program is arranged;

an import functionality that receives first network information originating from the identified node; and

an object modeling functionality that models received first network information and uses modeled information to determine nodes accessible to the computer program.

24. The article of manufacture of claim 23 wherein arrangement of a transmittal of specified first network information during execution of a discovery action is accomplished by requesting that the identified node corresponding to the discovery action transmit the specified first network information.

25. The article of manufacture of claim 23 wherein:

modeling of received first network information involves creating a plurality of objects such that each created object has a type specified in a stored object model;

the object model includes object type definitions specific to the first network protocol;

the created objects represent received first network information; and

each created object is a logical representation of received first network information for a plurality of first network nodes.