JPH09321761A - Intra-device path monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute bi-directional routing check on the transmission side of a cell for monitoring inside a device in the case of monitoring a path in the device by transmitting the cell for monitoring the inside of the device every fixed time within the device in an ATM(asynchronous transferring mode) with a routing function. SOLUTION: The transmission side 1 of the cell for monitoring inside the device transmits a port number P and VPI number VP being a transmission destination address 5 to a port number P' and VPI number (transmission destination address information) VP' being a transmission destination routing data of a transmission side routing table by adding to a cell (a) for monitoring inside the device. The reception side 2 of the cell for monitoring inside of the device sends back a cell (b) for monitoring inside the device obtained by adding the port number P' and the VPI number VP on the receiving side to the port number P and the VPI number VP added to the sent up cell (a). Thereby bi- directional routing check is enabled on the insertion side of a path monitoring cell within the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-device path monitoring system, and more particularly to an in-device path monitoring cell by transmitting and receiving an in-device path monitoring cell between a transmitting side and a receiving side. The present invention relates to an in-apparatus path monitoring system for path monitoring.

[0002]

2. Description of the Related Art A conventional path monitoring system in a device of this type is an ATM (Asynchr) having a routing function.
In an empty transfer mode device, a cell for performing in-device monitoring is transmitted in the device at regular intervals to monitor the path in the device.

Generally, an example of this type of intra-device path monitoring method will be described with reference to FIG. Referring to the system schematic diagram of FIG. 3A, an intra-device path monitoring cell transmission side interface unit (hereinafter, simply referred to as a transmission side interface unit)
1, a cell switch unit 3, and an in-device path monitoring cell reception side interface unit (hereinafter, simply referred to as a reception side interface unit) 2.

The transmission side interface unit 1 uses a port number as address information and a VPI (Vertical Pas).
s Identifier) number as P and V respectively
P is assigned in advance. Receiving side interface unit 2
Similarly, P ′ and VP ′ are assigned respectively.

The transmitting side interface section 1 is based on the transmitting side routing table 4 shown in FIG. 3B, and has routing data 12 consisting of a port number and a VPI number.
An in-device monitoring cell c composed of (see the cell format in FIG. 3C) and the in-device monitoring pattern 11 is generated and sent to the cell switch unit 3.

As shown in FIG. 3B, the routing table 4 comprises an address section 5 and a data section 6, the address section 5 indicating the address information of the source interface section, and the data section 6 of the destination interface section. The address information is shown.

The cell switch section 3 sends out the cell c to the corresponding receiving side interface section 2 based on the received routing data 12 of the monitoring cell c.

The receiving side interface unit 2 judges the port number and VPI number which form the received routing data 12 of the cell c and checks the in-device monitoring pattern 11.

That is, the routing data 1 of the cell c
2 port number and VPI number (destination address information)
Is the port number P ′ and VP of the reception side interface unit 2
It is determined whether or not it matches the I number VP ', and
It is checked whether or not the in-device monitoring pattern 11 matches a predetermined pattern.

[0010]

In such a conventional intra-device path monitoring system, between the transmission side interface section 1 and the reception side interface section 2 which are arranged to face each other with the cell switch section 3 interposed therebetween. In the case of performing bidirectional intra-device path monitoring, as described above, in addition to generating the intra-device path monitoring cell c from the transmission side interface unit 1 and transmitting it to the reception side interface unit 2, The interface unit 2 also needs to generate an intra-device path monitoring cell and send it to the transmitting side interface unit 1.

It is an object of the present invention to provide a path monitoring system capable of bidirectional intra-device path monitoring by generating an intra-device path monitoring cell only in the transmission side interface section.

[0012]

According to the present invention, the in-device path monitoring cell is checked by transmitting / receiving the in-device path monitoring cell between the transmitting side and the receiving side to check the in-device path monitoring cell. An in-device path monitoring system configured to do so, wherein the transmitting means is provided on the transmitting side, and which adds source address information and destination address information to an in-device path monitoring cell and transmits the cell. Check means for receiving the in-device path monitoring cell and checking the received cell, and source address information and destination address information for the received cell provided on the receiving side. A transmitting unit that adds and returns the received cell to the transmitting side and transmits it, and a transmission means that is provided on the transmitting side and receives the loopback-transmitted in-device path monitoring cell to check the receiving cell. Device path monitoring system which comprises a check means for performing click is obtained.

The source address information is the port number and VP of the side that transmits the in-device path monitoring cell.
It is an I number, and the transmission destination address information is a port number and a VPI number on the side that receives the in-device path monitoring cell.

Further, each of the checking means on the transmitting side and the receiving side is configured to check the destination address information added to the in-device path monitoring cell.

Further, the in-device path monitoring cell has a predetermined monitoring pattern, and each of the checking means on the transmitting side and the receiving side is configured to check the monitoring pattern. It has a feature.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The operation of the present invention will be described. First, the in-device path monitoring cell is transmitted from the transmitting side interface section to the receiving side interface section, and the receiving side interface section simply returns the received cell and sends it to the transmitting side interface section. At this time, the address information of the transmission destination and the transmission source is replaced in the cell to be returned.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining an embodiment of the present invention. (A) is a system block diagram, (B) is a transmission side routing table, and (C) is a format diagram of a path monitoring cell in a device. Is. 1, the same parts as those in FIG. 3 are designated by the same reference numerals.

A port number (Port) P and a VPI number VP are assigned to the transmitting side interface unit 1, and a receiving side interface unit 2 has port numbers P'and V.
The PI number VP 'is assigned.

In the transmitting side interface unit 1, the in-device path monitoring cell a is generated in the format as shown in FIG. 1C based on the transmitting side routing table 4 in FIG. 1B.

That is, the address information P ', VP' of the receiving side interface section 2 is added to the routing data 7 which is the destination address information, and the source address information 8 of the transmitting side interface section 1 is added. Address information P and VP are added.

As the in-apparatus monitoring pattern 11, a predetermined pattern (for example, an alternating pattern such as 0101101 ...) Is inserted.

The cell a thus obtained is transmitted to the cell switch unit 3. The cell switch unit 3 refers to the destination address information 7 of the cell a and sends the cell a to the reception side interface unit 2 having the corresponding port number and VPI number.

The reception side interface unit 2 receives the transmitted cell a, judges the port number and VPI number of the routing data 7 and checks the in-device monitoring pattern 11, thereby performing in-device path monitoring. .

Further, in the receiving side interface section 2, the destination address information is rewritten for the routing data 7 of this cell a, and the source address information is rewritten for the address information 8, and the transmitting side interface section 2 is rewritten. 1
The cell b is to be turned back to.

Therefore, in the routing data 7 of the cell b, the port number P and VPI of the transmitting side interface unit 1 are included.
The number VP is written, and the port number P ′ and VPI number VP ′ of the receiving side interface unit 2 are written in the address information 10.
Will be written.

The cell switch unit 3 receives the cell b transmitted from the reception side interface unit 2 and, based on the routing data 9 thereof, sends it to the transmission side interface unit 1 corresponding to the corresponding port number and VPI number. Send b.

The transmitting side interface unit 1 uses this cell b.
The intra-device path monitoring is performed by determining the port number and VPI number of the routing data 9 of 1. and checking the intra-device monitoring pattern 11. As described above, the bidirectional path can be monitored.

2A and 2B are views for explaining a concrete example of the present invention. FIG. 2A is a system block diagram, FIG. 2B is a diagram showing an example of a transmitting side routing table 4, and FIG. 2C is a bidirectional device. It is a format diagram of the path monitoring cells a and b, and the same parts as those in FIG. 1 are denoted by the same reference numerals.

In this example, the transmission side interface unit 1 is a transmission line side high speed interface unit, and the port number P0 and the VPI number VP0 are assigned to this interface unit. The receiving side interface unit is a subscriber side low-speed interface unit, and the interface unit 2 has port numbers P1 and VPI numbers VP1.
Are assigned. Then, as the monitoring pattern 11, a predetermined “X” is used.

The operation of the concrete example of FIG. 2 is the same as that of the embodiment of FIG. As the monitoring pattern 11, the pattern of the unidirectional cell a from the transmission side interface unit 1 to the reception side interface unit 2 is set to “X”, and the reverse direction from the reception side interface unit 2 to the transmission side interface unit 1 is used. The pattern of the other-direction cell b may be set to "inverted X" which is an inverted pattern of "X" and may be transmitted back.

[0032]

The effect of the present invention is that bidirectional routing check can be performed on the insertion side of the intra-device path monitoring cell.

The reason is that the routing check in the device path monitoring is performed not only in the determination of the port number and the VPI number at the routing destination (the device monitoring cell receiving side) but also in the device monitoring on the device monitoring cell receiving side. This is because, when the reception cell is received, the port number and VPI number of the receiving side are added to the in-device monitoring cell, and the cell is returned to the transmitting side to determine the port number and VPI number on the transmitting side.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.

FIG. 2 is a diagram illustrating a specific example of the present invention.

FIG. 3 is a diagram illustrating an example of a conventional intra-device path monitoring method.

[Explanation of symbols]

 1 transmitting side interface section 2 receiving side interface section 3 cell switching section 4 transmitting side routing table a to c in-device path monitoring cell

Claims (4)

[Claims] 1. An in-device path monitoring system for performing in-device path monitoring by transmitting and receiving an in-device path monitoring cell between a transmitting side and a receiving side to check the in-device path monitoring cell. A transmission means provided on the transmission side for transmitting source address information and destination address information to an in-device path monitoring cell and transmitting; and an in-device path monitoring provided on the receiving side. Checking means for receiving the receiving cell and checking the receiving cell, and a receiving means provided in the receiving side for adding the source address information and the destination address information to the receiving cell to make the receiving cell the transmitting side. Transmitting means for returning to and transmitting to the transmitting side, and checking means provided on the transmitting side for receiving the in-device path monitoring cell transmitted by returning and checking the receiving cell Device path monitoring system, which comprises a. 2. The source address information is a port number and VPI (Vi) of a side transmitting the in-device path monitoring cell.
2. The in-device path monitoring system according to claim 1, wherein the destination address information is a port number and a VPI number on the side that receives the in-device path monitoring cell. 3. The check means on each of the transmission side and the reception side is configured to check the destination address information added to the in-device path monitoring cell. 2. The in-device path monitoring system according to 2. 4. The in-device path monitoring cell has a predetermined monitoring pattern, and each of the checking means on the transmitting side and the receiving side is configured to check the monitoring pattern. The in-device path monitoring system according to any one of claims 1 to 3.