System and method for resolving the location of a station on a local area network

• US 5,437,046 A
• Filed: 02/24/1993
• Issued: 07/25/1995
• Est. Priority Date: 02/24/1993
• Status: Expired due to Term

• Current Assignee: Computer Associates Think Inc. (Broadcom, Inc.)
• Original Assignee: LEGENT Corp. (Broadcom, Inc.)
• Inventors: Boyce, Keith S., Bright, Norman T., Clark, Robert
• Primary Examiner(s): Coleman, Eric
• Assistant Examiner(s): HARRITY, JOHN E
• Application Number:
  US08/021,786
• Time in Patent Office: 881 Days
• Field of Search: 395/800, 395/650, 395/200, 370/17, 364/242.95, 364/DIG. 1
• US Class Current: 709/224
• CPC Class Codes: H04L 12/462 LAN interconnection over a bridge based backbone
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/06 Generation of reports
• CPC Class Codes: H04L 43/12 Network monitoring probes

Abstract

A network monitor, for use in a network comprised of a plurality of segments, each segment connected to at least one other segment by a bridge operating transparently to stations on the network, and for resolving the location of a station on the network, includes a primary resolver for generating and sending a primary probe to the station, a primary observer for monitoring primary probes and for generating and sending a primary observation report in response to the primary probes, a first receiver for receiving the primary observation reports, and a circuit, responsive to the received primary observation reports, for generating and sending secondary probe requests. The network monitor also includes secondary resolvers for receiving the secondary probe requests and for generating and sending secondary probes in response thereto, secondary observers for monitoring secondary probes and for generating and sending a secondary observation report in response thereto, a second receiver for receiving the secondary observation reports, a circuit for creating and transmitting a summary of the received secondary observation reports, a third receiver for receiving the summaries, and a resolver for determining the location of the station based on the primary observation reports and the summaries.

Claims

1. A system for resolving a location of one of a plurality of stations on a network wherein said network comprises a plurality of segments, each segment connected to at least one other segment by a bridge operating transparently to the stations, said system comprising a plurality of network monitors, one being attached to each segment of said network, each of said network monitors comprising:

primary resolution means for generating and sending a primary probe via said network to a station to be resolved.;

primary observing means for monitoring primary probes and for generating and sending a primary observation report, said primary observing means being responsive to said primary probes;

first means for receiving said primary observation reports;

request means, responsive to said first means for receiving, for generating and sending secondary probe requests;

secondary resolution means for receiving secondary probe requests and for sending secondary probes via said network, said secondary resolution means being responsive to said secondary probe requests;

secondary observing means for monitoring said secondary probes and for generating a secondary observation report, said secondary observing means being responsive to said secondary probes;

second means for receiving said secondary observation reports;

means for creating and transmitting a summary of received secondary observation reports, said means for creating being responsive to said second means for receiving;

third means for receiving said summaries; and

resolving means for resolving the location of said station based on said primary observation reports and said summaries.

2. The system of claim 1 wherein at least one primary observing means observes said primary probe and wherein said secondary probe requests are directed to each of said primary observing means which observe said primary probe;

and whereby said resolving means resolves station ownership to be said primary observing means which observes said primary probe but does not observe each of said secondary probes.

3. The apparatus of claim 1 wherein no primary observing means observes said primary probe and wherein a secondary probe request is directed to one of said primary observing means and said secondary probe is observed by said primary resolution means;

and whereby said resolving means resolves said primary resolution means to be owner of said station.