Method of maintaining PVC status packetized communication system

United States Patent m

Burwell et al.

[54] METHOD OF MAINTAINING PVC STATUS PACKETIZED COMMUNICATION SYSTEM

[75] Inventors: Wayne Burwell, Ottawa; Darren Helmer, Nepean, both of Canada

[73] Assignee: Newbridge Networks Corporation,

Kanata, Canada

[21] Appl. No.: 278,492
[22] Filed: Jul. 21,1994

[51] Int. CI.6 G06F 13/00

[52] U.S. CI 370/60; 370/60.1; 370/94.1

[58] Field of Search 370/60, 60.1, 94.1,

370/95.2

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US005539734A [ii] Patent Number: 5,539,734 [45] Date of Patent: Jul. 23, 1996

Primary Examiner—Jack B. Harvey
Assistant Examiner—John Travis
Attorney, Agent, or Firm—Marks & Clerk

[57] ABSTRACT

A method of managing an interface to an internal message pipe, such as an FDDI bus, comprises sending a status enquiry message to request the status of each PVC having a DLCI in a specified range, receiving a subset status message containing sequence exchange numbers corresponding to the last status message sent out, updating the contents of a station's PVC's in response to the received subset status message, and propagating PVC status changes between entities on the pipe.

6 Claims, 3 Drawing Sheets