Network analysis scalable analysis tool for multiple protocols

• US 7,352,706 B2
• Filed: 09/12/2003
• Issued: 04/01/2008
• Est. Priority Date: 09/16/2002
• Status: Active Grant

• Current Assignee: Viavi Solutions, Inc. (Lumentum Holdings Inc.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Mann, Jason David, McDaniel, Timothy Lane, Klotz, Steve
• Primary Examiner(s): Patel; Ajit
• Application Number:
  US10/661,907
• Publication Number:
  US 20040057389A1
• Time in Patent Office: 1,663 Days
• Field of Search: 370/241, 370/244, 370/245, 370/250, 370/252, 370/254, 370/464, 370/469, 714/48
• US Class Current: 370/254
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 41/20 Network management software packages
• CPC Class Codes: H04L 41/22 comprising specially adapted graphical user interfaces [GUI]

Abstract

Embodiments of the invention provide a scalable method for analyzing a network. The method includes generating a data trace representative of the network, determining a topology for the network from the data trace, and sequentially analyzing each frame in the data trace to determine at least one of network errors, warnings, and metrics. The analysis of each frame generally includes analyzing a first protocol layer of the frame with a first expert engine, determining if a second protocol layer is present in the frame, passing the frame to a second expert engine, and passing the frame to additional expert engines if the frame contains additional protocol layers.

Claims

1. A scalable method for analyzing a network, comprising:

generating a data trace representative of the network;

determining a topology for the network by analyzing a sequence of data in the data trace;

sequentially analyzing each multilayer protocol frame in the data trace to determine at least one of network errors, warnings, and metrics, the analysis of each multilayer protocol frame comprising;

analyzing a first protocol layer of the multilayer protocol frame with a first expert engine;

determining if a second protocol layer is present in the multilayer protocol frame;

passing the multilayer protocol frame to a second expert engine; and

passing the multilayer protocol frame to additional expert engines if the multilayer protocol frame contains additional protocol layers, and

identifying the location of the at least one of network errors, warnings, and metrics in the topology for the network.

2. The method of claim 1, wherein each of the protocol layers comprise one of the layers in the OSI seven layer or Fibre Channel FC-0 to FC-4 protocol standards.

3. The method of claim 1, wherein each expert engine is configured to analyze a specific protocol layer.

4. The method of claim 3, wherein each expert engine is configured to analyze a protocol layer for at least one of errors, warnings, and metrics, and then pass the multilayer protocol frame onto other engines for analysis of additional protocol layers in the multilayer protocol frame.

5. The method of claim 1, wherein the first expert engine is configured to analyze a first protocol layer taken from any data format.

6. The method of claim 1, wherein the expert engines are configured to analyze specific protocol layers regardless of the data format origin.

7. A method for analyzing a network, comprising:

capturing a data trace representative of network operation;

determining a topology for the network by analyzing a sequence of data in the data trace;

parsing through the data trace on a frame by frame basis;

analyzing each protocol layer of each multilayer protocol frame for errors using a protocol specific engine to analyze each protocol layer of each multilayer protocol frame, wherein analyzing further comprises;

a) analyzing a first protocol layer of the multilayer protocol frame with a first protocol engine specifically configured to analyze the first protocol layer to determine errors for the first protocol layer;

b) determining if the multilayer protocol frame has additional protocol layers; and

passing the multilayer protocol frame to a second protocol engine specifically configured to analyze the second protocol layer for errors if additional protocol layers are determined, and

identifying the location of the errors in the topology for the network.

8. The method of claim 7, further comprising repeating steps (a) and (b) for additional protocols until each protocol of the multilayer protocol frame has been processed.

9. The method of claim 7, wherein each protocol engine is configured to analyze a specific protocol layer regardless of the data format origin.

10. The method of claim 7, wherein analyzing comprises using the determined topology of the network to determine errors for each protocol layer.

11. The method of claim 7, wherein determining the topology further comprises analyzing the data trace for indicators of devices on the network.

12. The method of claim 7, wherein capturing the data trace comprises positioning at least one analyzer in communication with the network.

13. The method of claim 12, further comprising positioning the analyzers such that bidirectional communication for each device on the network is captured in the data trace.

14. A method for analyzing a network having multilayer protocol frames, comprising:

capturing a data trace from the network;

determining a topology of the network by analyzing a sequence of data in the data trace;

stepping through each multilayer protocol frame in the data trace to determine errors at each level of the multilayer protocol frame, wherein stepping through each multilayer protocol frame in the data trace comprises;

parsing a first protocol layer from the multilayer protocol frame;

analyzing the first protocol layer for errors using a first protocol layer expert engine;

storing errors determined by the first protocol engine;

determining if the multilayer protocol frame contains additional protocols;

passing the multilayer protocol frame to a second protocol engine if the multilayer protocol frame is determined to contain additional protocols;

parsing a second protocol layer from the multilayer protocol frame for processing by the second protocol engine;

and analyzing the multilayer protocol frame with the second protocol engine to determine errors in the second protocol layer; and

presenting the determined and the location of the errors in the topology for the network errors to a user via a graphical interface.

15. The method of claim 14, further comprising repeating the analyzing and passing steps until each protocol layer of the multilayer protocol frame has been analyzed.

16. The method of claim 14, wherein each protocol layer may originate from various data sources and protocols.

17. The method of claim 14, wherein the analyzing steps include using the determined network topology.