JP3466927B2 - Transmission management device and transmission management method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission management apparatus and a transmission management method for managing a network in a multicast type network for transmitting a transmission signal from one transmitter to a plurality of receivers. .

[0002]

2. Description of the Related Art For example, SDH (Synchronous Digital Hi)
erarchy) / SONET (Synchronous Optical NETwor
In the conventional transmission system such as the one conforming to k), the transmitter and the receiver are in one-to-one correspondence, and the transmission line is composed of the up line and the down line. In such a transmission system, when a failure occurs, it is possible to identify a failure point and transfer a failure alarm.

Such a conventional transmission system will be described with reference to FIG. FIG. 6 is a schematic configuration diagram of a conventional optical transmission system. 101 is a terminal station device, 102 is a relay device, and 103 is a management device. In this management device 103, an ECC (Embedded Communication Channel) or DC
Fault management, configuration management, etc. are performed using means such as N (Data Communication Network). By the way, these means have been specialized only for the one-to-one communication method in which bidirectional links exist.

Here, the ECC is an in-apparatus communication channel, and is a communication path for maintenance / monitoring installed in a transmission system to be managed. For example, SDH / SONET
For equipment, D1-12 in SOH (Section OverHead)
Byte (DCC) corresponds to this. DCN is a data communication network for maintenance / monitoring provided in addition to the transmission system to be managed (ITU-T Recommendation
See G.782,784).

A transmission system using the wavelength division multiplexing method in optical communication is one in which a plurality of optical signals of different wavelengths pass through one optical transmission line. Such a conventional transmission system will be described with reference to FIG. FIG. 7 is a schematic configuration diagram of a conventional transmission system using the wavelength division multiplexing method. 111 and 112 are optical transmission terminal stations using the wavelength division multiplexing method, and 113 to 116 are repeaters. In such a transmission system, for example, when the transmission path between the repeaters is cut off, the wavelength-multiplexed channels are cut off, but the transmission paths of the repeaters 113 and 114 are managed. It was By the way, in such a transmission system, it may be possible to consider a virtual transmission line, but in this case, transmission and reception are one-to-one, and bidirectional communication paths (paths) form a pair. Then, the failure point is determined by monitoring each transmission path.

On the other hand, conventionally, some devices such as LANs can perform multicast type communication which is one-to-many type communication. However, the method of managing the device manages individual devices, and the management device collects all the device information and manages the entire network.

A conventional communication system in a LAN will be described with reference to FIG. FIG. 8 is a schematic configuration diagram of a communication system in a conventional LAN. 201 is a network, 202 is a transmitting device, 203 is a receiving device, 204 is a network management device, and 205 is a router. The network management device 204 includes a transmission device 202 and a reception device 2.
03, the router 205 is individually managed, and the network 201 is monitored and managed by considering all the obtained information.

[0008]

However, the conventional transmission system is applied in the one-to-one type communication as described above, and the management method has been established in the one-to-many type communication system. It was difficult to apply to this.

On the other hand, in the conventional management device in a LAN or the like, there is a limit in identifying a failure point in various devices (or systems) and realizing an automatic recovery function, and high reliability is not satisfied. Further, the transmission route itself is not monitored, and it is determined that the transmission route is normal only by the normal communication between the terminals. Also in this respect, it was difficult to secure high reliability.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a multicast type network for transmitting a transmission signal from one transmitter to a plurality of receivers. It is an object of the present invention to provide a transmission management device and a transmission management method capable of surely managing the above.

[0011]

In order to achieve the above object, the present invention receives n (n: an integer of 2 or more) signals from one transmitting means through a transmission line and a branching means. In the network transmitting to the means, n virtual receiving means corresponding to each receiving means, n virtual transmitting means corresponding to each virtual receiving means, and n connecting virtual transmitting means and virtual receiving means corresponding to each other. N virtual paths each of which corresponds to a path from the one transmitting means to each receiving means and which is independent of each other, is provided to prevent occurrence of a failure in the transmitting means and each receiving means. In addition to monitoring, monitoring the occurrence of transmission failure in each virtual path,
When the failure of the transmitting means is detected, the fact that the failure has occurred in the n virtual transmitting means is output, and when the failure of the receiving means is detected, the failure occurs in the virtual receiving means corresponding to the receiving means. In addition to outputting the above, it is proposed that when a transmission failure of a virtual path is detected, the location where the failure has occurred is specified and output based on the detection information of the transmission failure in each virtual path.

According to the present invention, in a network in which a signal is transmitted from one transmitting means to n receiving means, there are n virtual paths consisting of virtual transmitting means, virtual transmission lines, and virtual receiving means. Since n pieces are set in correspondence with the receiving means, it is possible to manage like one-to-one type transmission from the virtual transmitting means to the virtual receiving means. When a failure of the transmitting means is detected, it can be recognized as a failure of the n virtual transmitting means, and when a failure of the receiving means is detected, it can be recognized as a failure of the corresponding virtual receiving means. When a transmission failure occurs, the failure point can be specified based on the detection information of the transmission information in each virtual path.

As an example of a preferred aspect of the present invention, it is proposed that the failure occurrence point is specified by specifying, as a failure point, an overlapping point of a transmission path corresponding to one or more virtual paths in which a transmission failure is detected. . According to this, it is possible to reliably and easily identify the location of the failure.

Further, as an example of a preferred embodiment of the present invention,
It is proposed that the transmission path includes a repeater, and that the virtual path is set so as to include a virtual repeater corresponding to the repeater between a plurality of virtual transmission paths.
According to this, even when a repeater is included in the transmission path, the transmission management can be surely performed.

Further, as an example of a preferred aspect of the present invention, the transmitting means is an optical transmitting means, the transmission path is an optical transmission path, and the receiving means is an optical receiving means. To propose. According to this, the transmission management can be surely performed even in the optical transmission system.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission management device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of a transmission management device. 1 is a transmission management device, 2 is a control unit, 3 is a real device information management unit, 4 is a virtual device information management unit, and 5 is an input / output unit.

The transmission management device 1 is installed in an optical transmission system and manages transmission of a transmission device, a reception device and the like in the optical transmission system. Specifically, the transmission management device 1 exchanges information with the optical transmission system, another control device, an operation system, and the like via the input / output unit 5. The actual device information management unit 3 manages actual device information of devices such as transmitters and receivers provided in the optical transmission system. The virtual device information management unit 4 is a virtual transmission device, a virtual reception device, a virtual relay device, and a virtual XX device that are virtually set in correspondence with a path including an actual transmission device, a reception device, a relay device, and other devices. The virtual path consisting of is set and managed.

In addition, the transmission management apparatus 1 as described above has various devices, such as a transmission device, which are originally shared with the other party who has made an access request to the transmission management device 1 as if only for a specific communication. Gives various management information as used. Here, when there is an access request from another control device or operation system that is not permitted to access the specific real device information, the real device information management unit 3 and the real device information management unit 4 and the real device information management unit 4 Based on the correspondence with the device information management unit 3, the information is constructed in units of virtual paths and is output. In addition, for information that can access the actual device information, various information can be accessed upon request.

Next, management of the transmission system using the transmission management device 1 will be described with reference to FIG. FIG. 2 is a diagram for explaining an actual configuration and a virtual management configuration of various devices in the transmission system, 11 is a transmitting device, 12-
1 to 12-n (n: positive integer) are receiving devices, 13-1
To 13-n are virtual transmitters, 14-1 to 14-n are virtual receivers, 15-1 to 15-n are virtual transmission lines, 1
6-1 to 16-n are virtual paths.

In this optical transmission system, as shown in FIG. 2A, a transmitter 11 and a plurality of receivers 12 for optical communication are installed at distant places, and a transmission signal from the transmitter 11 is transmitted. Is received by the plurality of receiving devices 12. The transmission system is managed by the transmission management device 1. The transmission management device 1 uses the EC described above.
Communication with each device is performed using means such as C and DCN, and the transmission device 11 and the reception device 12 and transmission failures between them are detected by this ECC and DCN.

As shown in FIG. 2B, management targets for various devices (hardware) in the transmission management device 1 are from the virtual transmission device 13-i, the virtual transmission line 15-i, and the virtual reception device 14-i. Virtual path 16-i (i: 1 to
n is an integer). Here, the substance of the virtual transmission device 13-i is associated with the transmission device 11 that is present only once. In addition, each virtual receiving device 14-i is associated with an actual receiving device 12-i. Further, the virtual transmission line 15-i is connected to the transmitter 11 and the receiver 12, respectively.
It corresponds to a device such as a transmission path to the -i, a repeater, and the like, and does not include a device that is not used for communication between the transmitting device 11 and the receiving device 12-i. Further, the virtual paths 16-i are respectively transmitted from the transmission device 11 to the reception device 12-i.
Is a virtual path (communication path) from the virtual transmission means 13-i to the virtual reception means 14-i. If there is a transmission path in the opposite direction between the transmission device 11 and the reception device 12-i, the corresponding transmission / reception system and transmission path are to be managed.
Manage as if it exists virtually.

In this transmission system, a case where a failure occurs at point A in the transmission line of FIG. 2A will be described. In this case, the failure at the point A does not affect the communication between the transmission device 11 and the reception device 12-1, but the failure between the transmission device 11 and the reception devices 12-2 to 12-n. Communication is cut off. Therefore, the transmission management device 1
Treats the virtual path 16-1 connecting the virtual transmission means 13-1 and the virtual reception device 14-1 as if they are operating normally, but the virtual transmission devices 13-2 to 13-n and the virtual reception device 1 are treated.
Virtual paths 16-2 to 16-2 respectively connecting 4-2 to 14-n
16-n is managed so as to be disconnected, that is, to be abnormal. In this way, the paths between the transmitting device 11 and the receiving device 12 are treated as a plurality of virtual paths 16 independently of each other. Therefore, if the normal / abnormal overlap of the virtual paths 16 is obtained, the location of the failure is identified. Easy to identify.

When a failure occurs in the transmission device 11, it is managed as a failure in each virtual transmission device 13-i. Therefore, a failure occurs in all virtual paths 16-i. As independently managed. Furthermore, when a failure occurs in any of the receiving devices 12-i, the virtual receiving device 14 corresponding to the receiving device 12-i.
Manage i as failed, so
The virtual path 16-i including the virtual reception device 14-i is managed independently of other virtual paths 16 as a failure has occurred.

In this embodiment, the transmission system that performs optical transmission has been described as an example, but transmission may be performed by electrical signals.

Next, management of another transmission system using the transmission management device 1 will be described with reference to FIG. FIG. 3 is a diagram for explaining an actual configuration and a virtual management configuration of various devices in the star network transmission system.
1-3 are transmitting devices, 22-1 to 22-3 are receiving devices,
23 is a concentrator, 24-1 to 24-3 are virtual transmitters, 25-1 to 25-3 are virtual receivers, 26-1 to 26-3 are virtual concentrators, 27-1 to 27-6 are virtual. Transmission lines 28-1 to 28-3 are virtual paths.

As shown in FIG. 3A, this transmission system is in a star-shaped network using a concentrator 23, and each transmitter 21 and receiver 22 is connected to the concentrator 23. It is connected in a star shape. As the concentrator 23, for example, a LAN device such as a switching hub or a router, or an optical branching device such as an optical coupler (splitter) or an arrayed waveguide grating (AWG) is used.

In the transmission management device 1, for example, one transmitter 21-1 of the transmitters 21 performs multicast transmission to a plurality (for example, three) of receivers 22 via the concentrator 23. In this case, as shown in FIG. 3B, devices and paths are virtually set and managed. That is, a plurality of virtual transmitters 24-i corresponding to the transmitter 21-1, a plurality of virtual concentrators 26-i corresponding to the concentrator 23, and a virtual one-to-one correspondence with each receiver 22-i. Receiving device 25-i and virtual transmission line 2 connecting them
Virtual path 28-consisting of 7- (2i-1) and 27-2i
i (i: 1 to 3) is managed.

The transmission management device 1 is, for example, a concentrator 23.
When a failure occurs in the virtual line concentrator 26-1 to 26-3, a process such as issuing an alarm is performed assuming that all the virtual line concentrators 26-1 to 26-3 have failed. Further, when a failure occurs in the transmission line connecting the concentrator 23 and the receiver 22, an alarm is issued only to the relevant virtual path 28-i, and the other virtual paths 28-i are operating normally. Manage as if they exist.

Next, management of another transmission system using the transmission management device 1 will be described with reference to FIG. FIG. 4 is a diagram illustrating an actual configuration and a virtual management configuration of various devices in the transmission system using the add / drop device.
1 is a transmitter, 32-1 to 32-2 are receivers, 33
-1 to 33-5 are add / drop multiplexers, 34-1 to 34-
2 is a virtual transmitter, 35-1 to 35-2 are virtual receivers, 36-1 to 36-5 are virtual add / drop multiplexers, 37-
1 to 37-7 are virtual transmission lines, and 38-1 to 38-2 are virtual paths.

This transmission system is in a ring network using the add / drop device 33, and here, a case will be described in which multicast transmission is performed from the transmission device 31 to the reception devices 32-1 and 32-2. In this transmission system, as shown in FIG. 4A, the communication from the transmitter 31 to the receiver 32-1 is performed by the add / drop multiplexer 33-1,
33-2. Further, the communication from the transmission device 31 to the reception device 32-2 is performed by the add / drop device 33-1,
33-2 and 33-3.

In the transmission management device 1, as shown in FIG. 4B, both the virtual transmission devices 34-1 and 34-2 are associated with the transmission device 31, and the virtual add / drop device 3
Both 6-1 and 36-3 are associated with the drop / insert device 33-1 and virtual drop / insert devices 36-2 and 36-4.
Are both associated with the drop / insert device 33-2, the virtual add / drop device 36-3 is associated with the add / drop device 33-3, and the virtual receivers 35-1 and 35-2 are respectively the receiver 32-1. , 32-2. The transmission management device 1 includes a virtual path 38-1 received by the virtual reception device 35-1 from the virtual transmission device 34-1 via the virtual add / drop devices 36-1 and 36-2, and a virtual transmission device 34-.
The virtual path 38-2 is received by the virtual receiving device 35-2 from the second via the virtual add / drop devices 36-3 to 36-5.

Drop-and-insert device 33 used in the present embodiment
Is a time division multiplexing (T) used in SDH / SONET networks.
In addition to the DM) add / drop device, a device that performs add / drop using optical means can be used. FIG. 5 shows a configuration example of the add / drop multiplexer 33. In FIG. 5, 331 is a separating means, 332 is a branching means, 333 is a multiplexing means, 334.
Is an add / drop circuit. The multiplexed signal is input to the demultiplexing means 331 and the branching means 332 is applied to the desired signal.
It is bifurcated by. One of the two branched signals is again multiplexed with the other signal by the multiplexed signal 333 and output to the other add / drop multiplexer 33. The other signal is output to the receiving device or another device. In addition, in the present embodiment, the ring type configuration is used, but the ring type is not particularly required, and the same can be applied to a bus type system.

As described above, according to the transmission management apparatus according to the present embodiment, in a network in which a signal is transmitted from one transmitter to n receivers, a virtual transmitter, a virtual transmission line, and a virtual transmitter are provided. The virtual path consisting of the receiving device is n
Since n units are set corresponding to the number of receiving devices, it is possible to manage like one-to-one type transmission from the virtual transmitting device to the virtual receiving device. When a failure of the transmitter is detected, it can be recognized as a failure of the n virtual transmitters, and when a failure of the receiver is detected, it can be recognized as a failure of the corresponding virtual receiver. ,
When a transmission failure occurs, the failure location can be specified based on the detection information of the transmission information in each virtual path. That is, it is possible to identify, as a failure point, an overlapping point of the transmission path corresponding to one or more virtual paths in which a transmission failure is detected.

Further, in the conventional technique, since many paths pass through the transmission path, it is necessary to narrow down what is wrong while taking the path information into consideration. This narrowing down work took a lot of time as the number of passes increased. However, according to the present invention, since each is treated as a virtual path independently of each other, there is an effect that the failure point can be easily determined only by obtaining the overlapping of the failure portions of each virtual path.

By the way, when interconnecting a network with another person, there has been a demand for transmitting only the minimum configuration information of the own network necessary for the operation of the network to the other party. In the management device or method, when the receiving side is the partner of the network of the other person, it is necessary to convey the extra configuration information. By managing the multicast communication as a collection of multiple virtual paths and providing it as information for other interconnected networks, the configuration information can be managed easily.

[0036]

As described in detail above, according to the present invention,
In a network in which a signal is transmitted from one transmitting means to n receiving means, a virtual transmitting means, a virtual transmission line,
Since n virtual paths formed by the virtual receiving means are set corresponding to the n receiving means, it is possible to manage the virtual paths from the virtual transmitting means to the virtual receiving means like one-to-one type transmission. When a failure of the transmission means is detected, it can be recognized as a failure of the n virtual transmission means,
When a failure of the receiving means is detected, it can be recognized as a failure of the corresponding virtual receiving means, and when a transmission failure occurs, the failure location can be identified based on the detection information of the transmission information in each virtual path. You can That is, it is possible to identify, as a failure point, an overlapping point of the transmission path corresponding to one or more virtual paths in which a transmission failure is detected.

Further, in the conventional technique, since many paths pass through the transmission path, it is necessary to narrow down what is wrong while taking the path information into consideration. This narrowing down work took a lot of time as the number of passes increased. However, according to the present invention, since each is treated as a virtual path independently of each other, there is an effect that the failure point can be easily determined only by obtaining the overlapping of the failure portions of each virtual path.

By the way, when interconnecting a network with another person, there has been a demand for transmitting only the minimum configuration information of the own network necessary for operation of the network to the other party. In the management device or method, when the receiving side is the partner of the network of the other person, it is necessary to convey the extra configuration information. By managing the multicast communication as a collection of multiple virtual paths and providing it as information for other interconnected networks, the configuration information can be managed easily.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmission management device.

FIG. 2 is a diagram illustrating an actual configuration and a virtual management configuration of various devices in a transmission system.

FIG. 3 is a diagram illustrating an actual configuration and a virtual management configuration of various devices in a star network transmission system.

FIG. 4 is a diagram illustrating an actual configuration and a virtual management configuration of various devices in a transmission system using the add / drop device.

FIG. 5 is a block diagram of a drop-and-insert device.

FIG. 6 is a schematic configuration diagram of a conventional optical transmission system.

FIG. 7 is a schematic configuration diagram of a conventional transmission system using a wavelength multiplexing method.

FIG. 8 is a schematic configuration diagram of a communication system in a conventional LAN.

[Explanation of symbols]

1 ... Transmission management device, 2 ... control unit, 3 ... actual device information management unit, 4 ... virtual device information management unit, 5 ... input / output unit 11,2
1-1 to 21-3, 31 ... Transmitting device, 12-1 to 12-
n, 22-1 to 22-3, 32-1 to 32-2 ... Receiving device, 23 ... Concentrator, 33-1 to 33-5 ... Drop and add device, 13-1 to 13-n, 24-1 to 24-3, 34-
1 to 34-2 ... Virtual transmission device, 14-1 to 14-n, 2
5-1 to 25-3, 35-1 to 35-2 ... Virtual receiving device, 15-1 to 15-n, 27-1 to 27-6, 37-
1 to 37-7 ... Virtual transmission lines, 16-1 to 16-n, 28
-1 to 28-3, 38-1 to 38-2 ... Virtual path, 26
-1 to 26-3 ... Virtual concentrator, 36-1 to 36-5 ...
Virtual add / drop device

Continuation of the front page (56) Reference JP-A-9-233094 (JP, A) JP-A-8-331152 (JP, A) JP-A-8-237251 (JP, A) JP-A-6-268747 (JP , A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 12/00-12/66 H04B 1/60 H04B 3/46-3/48 H04B 17/00-17/02

Claims (8)

(57) [Claims] 1. A transmission management device for managing transmission of a network for transmitting a signal from one transmitting means to n (n: an integer of 2 or more) receiving means via a transmission line and a branching means, It comprises n virtual receiving means corresponding to the receiving means, n virtual transmitting means corresponding to each virtual receiving means, and virtual transmitting means corresponding to each other and n virtual transmission lines connecting the virtual receiving means. , N corresponding to the paths from the one transmitting means to each receiving means and independent from each other.
Means for setting individual virtual paths, transmission monitoring means for monitoring the occurrence of failure in the transmitting means, reception monitoring means for monitoring the occurrence of failure in each receiving means, and virtual path monitoring for monitoring the occurrence of transmission failure in each virtual path Means for outputting a failure of the n virtual transmission means when the failure of the transmission means is detected by the transmission monitoring means, and a failure of the reception means by the reception monitoring means Means for outputting the fact that a failure has occurred in the virtual receiving means corresponding to the receiving means, and when the virtual path transmission failure is detected by the virtual path monitoring means, the transmission failure detection information in each virtual path And a means for identifying and outputting the location where the failure has occurred based on the transmission management apparatus. 2. The identification of the failure occurrence point is to specify an overlapping point of a transmission path corresponding to one or more virtual paths in which a transmission failure is detected as a failure point.
The described transmission management device. 3. The transmission path includes a repeater, and the virtual path is set so as to include a virtual repeater corresponding to the repeater between a plurality of virtual transmission paths. 2. The transmission management device according to any one of items. 4. The transmission means is an optical transmission means, the transmission path is an optical transmission path, and the reception means is an optical reception means. Transmission management device. 5. A network transmission management method for transmitting a signal from one transmitting means to n (n: an integer of 2 or more) receiving means via a transmission line and a branching means, corresponding to each receiving means. And n virtual transmission means corresponding to the respective virtual reception means, and n virtual transmission lines connecting the virtual transmission means and the virtual reception means corresponding to each other, each of the above-mentioned 1 N corresponding to the paths from the individual transmission means to the respective reception means and independent from each other
Number of virtual paths are set, the occurrence of a failure in the transmission means and each of the reception means is monitored, and the occurrence of a transmission failure in each virtual path is monitored. When a failure in the transmission means is detected, the n virtual transmission means When a failure of the receiving means is detected, the failure of the virtual receiving means corresponding to the receiving means is output, and when a transmission failure of the virtual path is detected. Is a transmission management method characterized by identifying and outputting a location where the failure has occurred based on detection information of the transmission failure in each virtual path. 6. The identification of the failure occurrence point is performed by specifying, as a failure point, an overlapping point of a transmission path corresponding to one or more virtual paths in which a transmission failure is detected.
The described transmission management method. 7. The transmission path includes a repeater, and the virtual path is set so as to include a virtual repeater corresponding to the repeater between a plurality of virtual transmission paths. 6. The transmission management method according to any one of 6 above. 8. The transmission unit is an optical transmission unit, the transmission line is an optical transmission line, and the reception unit is an optical reception unit. Transmission management method.