Systems and methods for interpreting communications packets

• US 6,931,574 B1
• Filed: 10/24/2001
• Issued: 08/16/2005
• Est. Priority Date: 10/24/2001
• Status: Expired due to Term

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Stager, Jim, Coupal, Dominic, Farley, Mark, Durham, Doug
• Primary Examiner(s): Beausoliel, Robert
• Assistant Examiner(s): Bonura, Timothy M.
• Application Number:
  US10/001,454
• Time in Patent Office: 1,392 Days
• Field of Search: 714/37, 714/39, 709/224, 709230-232, 715/530
• US Class Current: 714/39
• CPC Class Codes: H04L 41/0213 Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 43/045 for graphical visualisation of monitoring data
• CPC Class Codes: H04L 43/18 Protocol analysers
• CPC Class Codes: H04L 69/03 Protocol definition or specification protocol conformance testing H04L1/244

Abstract

Presently preferred embodiments of the current invention are directed to a protocol analyzer for interpreting data frames captured on a communications network. The protocol analyzer includes a network interface connection for providing the electrical and physical connection to the communications network and for receiving data frames from the network in a particular physical layer protocol format. The protocol analyzer further includes analysis software for providing an interpretation of received data frames. The interpretation of a frame is based upon a series of definition constructs that are stored in a protocol definition file and a protocol database of the protocol analyzer. The definition constructs collectively define the characteristics of a data frame for a given physical layer protocol. Also, the constructs provide a means for identifying any one of a number of higher level protocols that may be embedded within the data frame.

Also disclosed is a graphical user interface for use as a protocol editor for assembling the necessary definition constructs for inclusion in a protocol definition file. Further, embodiments of a graphical interface for displaying the results of interpreted frames is also disclosed.

Claims

1. A method for describing the content of a data frame present on a communications network having a predetermined physical layer protocol, the method comprising the following steps:

providing a protocol definition file, the protocol definition file including;

a first definition construct that defines the format of a data frame that is structured in accordance with the requirements of the predetermined physical layer protocol, and a second definition construct that defines a plurality of message protocol types;

storing the protocol definition file within a protocol database;

capturing a data frame present on the communications network;

ascertaining whether at least one protocol type of at least one message contained within the data frame from the plurality of message protocol types is defined by at least one of the plurality of message protocol types in the second definition construct;

providing a user with a protocol editor for creating a new message protocol type in the protocol definition file if at least one protocol type of at least one message contained within the data frame from the plurality of message protocol types is not defined by at least one of the plurality of message protocol types in the second definition construct; and

providing the content of the captured data frame with descriptions of the content of the captured data frame based upon the definitions of the first and the second definition constructs.

2. The method of claim 1, wherein providing a user with a protocol editor comprises providing the user with a text editor.

3. The method of claim 1, wherein providing a user with a protocol editor comprises providing the user with a graphical user interface that includes constructs corresponding to manipulatable fields and options.

4. The method of claim 1, wherein providing the content of the captured data frame comprises displaying graphical controls to allow the user to select what portions of the content of the captured data are displayed.

5. A method for describing the content of a data frame present on a communications network, the method comprising the following steps:

identifying a physical layer protocol;

ascertaining whether a corresponding protocol definition file exists for the identified physical layer protocol;

providing a user with a protocol editor for creating a new protocol definition file for the identified physical layer protocol if a corresponding protocol definition file does not exist for the identified physical layer protocol;

obtaining the data frame from the communications network;

interpreting the data frame according to at least one of the existing protocol definition file and the created protocol definition file; and

displaying frame contents and descriptions of the frame contents in accordance with at least one of the existing protocol definition file and the created protocol definition file.

6. The method of claim 5, wherein identifying a physical layer protocol comprises receiving information from a network interface module of a network analyzer.

7. The method of claim 5, further comprising loading at least one of the existing protocol definition file and the created protocol definition file into a database for use by a network analyzer.

8. The method of claim 5, wherein providing a user with a protocol editor comprises providing a user with a text editor.

9. The method of claim 5, wherein providing a user with a protocol editor comprises providing a user with a graphical user interface that includes constructs corresponding to manipulatable fields and options.

10. The method of claim 5, wherein displaying frame contents and descriptions of the frame contents comprises providing a high level description to a user to describe various fields of the frame and its contents.

11. The method of claim 5, wherein displaying frame contents and descriptions of the frame contents comprises displaying graphical controls to allow the user to select what portions the frame contents are displayed.

12. The method of claim 5, further comprising checking for additional frames on the communication network and displaying the additional frame contents and descriptions of the additional frame contents.

13. In a computer system having a graphical user interface including a video display device and a user input device, method of creating and/or editing protocol definition files used for displaying frame contents from a network with descriptions of the data frame contents, the method comprising:

displaying a graphical representation of one or more base constructs;

receiving a user selection of one of the one or more base constructs and displaying structures belonging to a hierarchy under the selected base construct;

receiving a user selection of one of the structures and displaying manipulatable fields and options for describing characteristics of the selected structure;

receiving user input in the fields and options describing characteristics of the selected structure; and

building a protocol definition file, that defines the organization of a data frame physical layer protocol, from the user inputs.

14. The method of claim 13, further comprising:

capturing a data frame from a network; and

interpreting the data frame according to the protocol definition file.

15. The method of claim 14, further comprising displaying frame contents and descriptions of the frame contents in accordance with the protocol definition file.

16. The method of claim 13, wherein the one or more base constructs comprise constructs for describing at least one of structures, fields, interpretations, padding, alternatives and arrays.

17. The method of claim 13, wherein the one or more base constructs comprise constructs for describing at least one of switches and groups.

18. The method of claim 13, further comprising receiving a description user input with a high-level description of the selected structure.

19. The method of claim 13, wherein displaying a graphical representation of one or more base constructs comprises displaying one or more base constructs with characteristics previously described for structures in the constructs.

20. The method of claim 13, wherein receiving user input in the fields and options describing characteristics of the selected structure comprises receiving at least one of a short name with a unique indentifier for the selected structure, a long name that provides a high-level description of the structure, a length that specifies the length of a structure, and a display flag that determines if data from a data frame corresponding to the structure will be displayed.