Loop status monitoring apparatus

• US 20060026471A1
• Filed: 11/24/2004
• Published: 02/02/2006
• Est. Priority Date: 07/30/2004
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kubota, Satoshi, Shikada, Hirotaka
• Granted Patent: US 7,475,328 B2
• Time in Patent Office: Days
• US Class Current: 714/724
• CPC Class Codes: H04L 12/437 Ring fault isolation or reconfiguration for SDH/SONET ring networks H04J3/085
• CPC Class Codes: H04L 43/0811 by checking connectivity

Abstract

A loop status monitoring apparatus monitors a status of an arbitration loop that includes a plurality of devices and a switch that controls connections between the devices, has at least one of loop status detection data, primitive detection data, and frame count data, and includes a failure detecting unit that detects whether an initialization failure, which is a connection failure, has occurred during an initialization of the arbitration loop from the loop status detection data; and a device identifying unit that identifies, when the initialization failure is detected, a device with the initialization failure occurred from the primitive detection data or the frame count data.

Claims

1. A loop status monitoring apparatus that monitors a status of an arbitration loop that includes a plurality of devices and a switch that controls connections between the devices, the loop status monitoring apparatus having at least one of loop status detection data that is a result of detecting a status of the arbitration loop, primitive detection data that is a result of detecting whether a primitive has been received at each of a plurality of ports of the switch, and frame count data that is a result of detecting a frame count received by each of the ports, the loop status monitoring apparatus comprising:

a failure detecting unit that detects whether an initialization failure, which is a connection failure, has occurred during an initialization of the arbitration loop from the loop status detection data; and

a device identifying unit that identifies, when the initialization failure is detected, a device with the initialization failure occurred from the primitive detection data or the frame count data.

2. The loop status monitoring apparatus according to claim 1, further comprising:

a data reading unit that reads the loop status detection data in the initialization from the switch, and attaches identification information to the loop status detection data read; and

a data storing unit that adds sequentially the loop status detection data with the identification information attached, and stores the loop status detection data as loop initialization data, wherein

the failure detecting unit detects whether the initialization failure has occurred based on the loop status detection data of the loop initialization data stored in the data storing unit, and

the device identifying unit identifies, when the initialization failure is detected, the device with the failure occurred from primitive detection data or the frame count data of the loop initialization data.

3. The loop status monitoring apparatus according to claim 2, wherein the identification information includes an index that identifies the loop initialization data as time series data, and address information at the beginning of the loop initialization data.

4. The loop status monitoring apparatus according to claim 1, wherein

the switch includes a device segregating unit that segregates the device with the initialization failure occurred, and

the device identifying unit controls the device segregating unit in such a manner that the device with the initialization failure occurred is segregated from the arbitration loop.

5. The loop status monitoring apparatus according to claim 1, further comprising a data counting unit that counts the primitive relating to the initialization, the primitive detection data-without detecting a reception of the primitive, or the frame count data for each of the devices, wherein

the device identifying unit identifies a device as the device with the initialization failure occurred when number of the primitive detection data or the frame count data counted by the data counting unit is greater than a predetermined value.

6. The loop status monitoring apparatus according to claim 5, wherein the data counting unit counts the primitive detection data without detecting a reception of a loop-initialization commencing primitive that commences the initialization for each of the devices.

7. The loop status monitoring apparatus according to claim 5, wherein the data counting unit counts the frame count data without detecting a reception of the frame in the initialization for each of the devices.

8. The loop status monitoring apparatus according to claim 5, wherein the data counting unit counts the primitive detection data without detecting a reception of an initialization ending primitive that ends the initialization for each of the devices.

9. A loop status monitoring method for a loop status monitoring apparatus that monitors a status of an arbitration loop that includes a plurality of devices and a switch that controls connections between the devices, the loop status monitoring apparatus having at least one of loop status detection data that is a result of detecting a status of the arbitration loop, primitive detection data that is a result of detecting whether a primitive has been received at each of a plurality of ports of the switch, and frame count data that is a result of detecting a frame count received by each of the ports, the loop status monitoring method comprising:

detecting whether an initialization failure, which is a connection failure, has occurred during an initialization of the arbitration loop from the loop status detection data; and

identifying, when the initialization failure is detected, a device with the initialization failure occurred from the primitive detection data or the frame count data.

10. A computer-readable recording medium that stores a status monitoring program for a loop status monitoring apparatus that monitors a status of an arbitration loop that includes a plurality of devices and a switch that controls connections between the devices, wherein

the loop status monitoring apparatus has at least one of loop status detection data that is a result of detecting a status of the arbitration loop, primitive detection data that is a result of detecting whether a primitive has been received at each of a plurality of ports of the switch, and frame count data that is a result of detecting a frame count received by each of the ports, and

the loop status monitoring program makes a computer execute

detecting whether an initialization failure, which is a connection failure, has occurred during an initialization of the arbitration loop from the loop status detection data;

and

identifying, when the initialization failure is detected, a device with the initialization failure occurred from the primitive detection data or the frame count data.