JP2591451B2 - Network 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 network management system in an optical transmission line network.

[0002]

2. Description of the Related Art In a conventional optical synchronous transmission line network, an example of a plurality of optical signal amplifying devices between optical signal terminating devices and a supervisory control device for monitoring each optical signal terminating device will be described with reference to FIG. In FIG. 10, which is a block diagram showing an example of the configuration of the monitoring and control device, reference numeral 21 denotes a monitoring and control device, which includes an optical signal terminal (LTM) communication means 22, an address table means 23, a secondary address table means 24, and information processing. A section 25 is provided. FIG. 11 is a block diagram showing a conventional packet transfer system. In FIG. 11, the same reference numerals as those in FIG.
Reference numerals 1 and 32 denote two optical signal termination devices (LTMs), 33a,
33b and 33c are serially connected optical signal amplifiers (repeaters) for amplifying optical signals, 34 is a subnet, 3
5 is an optical synchronous transmission line, and 36 is a supervisory control information transfer network.

FIG. 11 shows optical signal amplifiers 33a and 33a.
This figure shows the trajectory of the packet when the monitoring control device 21 transfers the monitoring control information to the optical signal amplifying device 33c when a failure occurs between the packets b. And the monitoring control device 2
1 and a packet transferred to the optical signal termination device 32 are transmitted simultaneously. The optical signal terminator 31 discards the packet because the communication state table cannot communicate. The optical signal terminating device 32 transfers the packet to the optical signal amplifying device 33c because the communication state table is communicable. The crosses indicate that a failure has occurred. In the embodiment of the present invention, there is no packet transmission from the monitoring control device 4 to the optical signal termination device 1.

In the configuration shown in FIG. 10, the supervisory control device 21 transmits the optical signal termination device 31 shown in FIG.
32 or an optical signal amplifying device (repeater) 33a, 33
The case where the monitoring control information is transmitted to b and 33c will be described. First, it is necessary to determine the address of the device as preparation. The address has a format as shown in FIG. 9, and includes a network address section, a subnet address section, and an optical signal terminal (LTM) address section (repeater address section). And subnet 3
4 is determined, and a repeater address is determined for each target optical signal amplifier (repeater) so as to be unique within the subnet. Further, a network address representing the entire network is also determined, and a total of three addresses are combined to determine an address as a repeater (optical signal amplifier). Therefore, the device address includes the subnet address.

[0005] Now, the supervisory control device 21 sends a supervisory control information packet to the supervisory control information transfer network 36. Each of the optical signal terminating devices 31 constituting the supervisory control information transfer network 36,
Reference numeral 32 determines the transfer destination by comparing and referring to the subnet address in the destination address of the received packet and the contents of the network route information table means (not shown), and transfers the packet. Such an operation of each of the optical signal terminating devices 31 and 32 has finally realized the packet transfer on the optimal path (shortest) as a function of the supervisory control information transfer network 36. With such a function of the monitoring control information transfer network 36,
The monitoring control information sent by the monitoring control device 21 is transferred to the subnet 34. Therefore, this subnet 3
The packet from the supervisory control device 21 arriving at No. 4 always reaches only one of the optical signal terminating devices 31 or 32, which is the “device that is the shortest path” due to the function of the supervisory control information transfer network 36 ( Here, it is assumed that the packet addressed to the subnet 34 from the normal monitoring control device 21 reaches the optical signal termination device 31).

In such a configuration, a failure indicated by a cross in FIG. 11 occurs between the optical signal amplifiers 33a and 33b,
If communication is disabled during that time, the occurrence of this failure is notified to the optical signal termination devices 31 and 32 from the optical signal amplification device that has detected the failure, and the communication status table means (not shown) held by each of the optical signal termination devices 31 and 32 ) Is updated according to the communication status. Further, for example, Japanese Patent Application Laid-Open
No. 230, the subnet is divided into two by the repeater stop processing function of the repeater. For example, the communication status table means held by the optical signal termination device 31 is as shown in FIG. FIG. 8 shows the contents of the communication state table means held by the optical signal terminating device 31 (1) in the conventional example and the embodiment. The optical signal terminating device 31 (1) is an optical signal amplifying device (repeater) 33a (3a). Can communicate with the optical signal amplifiers 33b (3b) and 33c
(3c) indicates that communication is not possible.

Next, the optical signal terminators 31 and 32 change their own subnet addresses based on their own host address table means (not shown). Then, the subnet address of the optical signal termination device 31 is not changed in SUB-1,
The subnet address of the optical signal termination device 32 is SUB-2
And change it to These two optical signal termination devices 31 and 3
When the second subnet address is changed, the subnet SUB-1, which was originally one subnet, is divided into two subnets of SUB-2. Thereafter, SUB-1
And SUB-2, the two subnets behave as if they were two different subnets from the beginning. this
Causes a failure in any subnet and
Signal amplification that can transfer packets only from the signal termination equipment
Even if a device occurs, it is different by dividing the subnet
Both subnets that have been assigned an address and are separated
By transmitting the same packet to the
Any packet is forwarded to the width device.
You.

Hereinafter, description will be made with reference to FIG. First, when the optical signal terminators 31 and 32 are notified of a failure from the optical signal amplifiers (repeaters) 33a to 33c, they notify the supervisory control device 21 of the occurrence of the failure. When the failure information is notified to the monitoring control device 21, the subnet in which the failure has occurred can be identified from the notification source address included in the failure information, and the information processing unit 25 registers the failure occurrence in the address table means 23 (FIG. 4).

[0009] By registering the failure occurrence in the address table means 23, the contents registered in the secondary address table means 24 have meaning. Thereafter, when sending a packet to the optical signal amplifying device 33b, the address SUB-1 registered in the address table means 23 is under failure and the address SUB-1
Is used as a key, the address SUB-2 is checked from the secondary address table means 24, and the addresses SUB-1, SUB-
The two packets having different subnet addresses are transmitted to both subnets (see FIGS. 4 and 5).
reference).

Next, a network address information table means (not shown) in a plurality of optical signal terminating devices constituting the supervisory control information transfer network 36 stores a subnet address SUB- newly generated in the event of a communication network failure in advance. 1, information for determining the route of a packet addressed to SUB-2 is registered (FIG. 6).
reference). As a result, the packet destined for the subnet of the address SUB-1 reaches the optical signal termination device 31, and the packet destined for the subnet of the address SUB-2 reaches the optical signal termination device 32.

The optical signal terminating device 31 checks the communication status table means (not shown) and discards the packet because it cannot communicate with the optical signal amplifying device 33b. Optical signal termination device 3
2 is communicable with the optical signal amplifying device 33b, and is thus transferred to the optical signal amplifying device 33c. As a result, only the response packet to the packet passed through the optical signal termination device 32 is returned to the monitoring control device 21. In the event of a failure, the unreachable optical signal termination device and the optical signal amplification device are used by using the function of autonomously changing the address of the optical signal termination device and the function of transferring packets to the two subnets of the supervisory control device 21. Control of the device was enabled.

[0012]

In such a conventional network management system, the optical signal terminating device and the optical signal terminating device in a certain subnet composed of a plurality of optical signal amplifying devices (optical signal amplifying device 33a- When a failure occurs between the optical signal amplifiers 33b), two monitoring control information packets to a certain repeater are simultaneously transmitted from the monitoring control device. This 2
One of the packets is information that is finally discarded by the optical signal termination device, and there is a problem that the transfer processing of the packet itself is wasted. Also, such transmission of two packets may cause network congestion when a plurality of failures occur between the optical signal terminators and when a large amount of monitoring control information is transferred. As a result, there is a problem that transfer performance as a network is reduced.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a network management system for efficiently transferring monitoring control information from a monitoring control device to a failed subnet.

[0014]

The network management system of the present invention comprises:
With each optical signal termination device via a predetermined supervisory control information transfer network
Connected, and each optical signal termination device is connected via a supervisory control information transfer network.
To exchange various information with the
A monitoring control device that monitors and controls each subnet
In addition, the optical signal terminating device adds the address of the subnet to which it belongs.
Host address holding own address including address
Table means and subnet to which it belongs when a failure occurs
Holding the address information for changing the address of
Next address table means, and an opposing optical signal termination device
Each optical signal amplifier provided on the optical synchronous transmission line between
Monitoring means for monitoring these failure notifications, and
If harm notification is detected, self or opposing light
See secondary address table means on one side of signal termination device
To change its own address autonomously and change its own host address.
The local host address table
Light that can communicate with its own address stored in
Sends predetermined notification information indicating the signal amplifying device to the supervisory control device.
And a communication processing means for communicating with each other.
An address that holds the net address and whether or not a failure has occurred.
Table and address when a failure occurs in each subnet.
Address table means for holding addresses,
Information on optical signal amplifiers that can communicate for each packet address
Communication status management table means for storing
A predetermined signal received from any optical signal termination device via the transmission network
Address table means, secondary address based on notification information
Of the communication table and the communication status management table
Updates the held contents and sends the specified monitoring control information to any subnet.
When transmitting to optical signal amplifiers belonging to
Refer to the table on the
Inspect for any harm and check if a
Address table means and communication
Address of the subnet obtained from the status management table
And information processing means for transmitting monitoring control information based on the
Is what you do.

[0015]

According to the present invention, in a network (subnet) composed of an optical signal amplifying device and an optical signal terminator connected to an optical synchronous transmission line, the subnet is divided by an optical synchronous transmission line (optical fiber) or the like. If a failure occurs, each divided device group is treated as a different subnet, and the supervisory control device receives the failure occurrence notification and the communication status with the optical signal amplifier from each optical signal termination device, and It should be registered in the management table means.

[0016]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a network management system according to the present invention. In FIG. 1, reference numerals 1 and 2 denote two terminals for terminating an optical signal from a repeater connected through a plurality of optical signal amplifiers (repeaters) 3a, 3b, and 3c connected in series for amplifying an optical signal. Optical signal termination device (L
TM), 4 are a plurality of repeaters 3a to 3c between the LTMs and a monitoring control device (CO) for monitoring and controlling the LTMs 1 and 2.
NT), 7 is a supervisory control information transfer network realized by using the overhead of an optical synchronous transmission frame for transferring repeater fault information from each optical signal termination device 1, 2 to the supervisory control device 4. A subnet 6, which is constituted by one optical signal termination device 1, 2 and a plurality of repeaters 3a to 3c and is also a component of the supervisory control information transfer network 7, is an optical synchronous transmission line.

FIG. 2 shows the optical signal termination devices 1 and 2 in FIG.
FIG. 3 is a block diagram illustrating a configuration example of FIG. In FIG.
8 is a communication processing unit, 9 is a CONT communication means for communicating with the monitoring control device 4, 10 is an LTM communication means, 1
1 is a repeater monitoring means for monitoring the optical signal amplifying apparatus, 12 is a communication state table means, 13 is a network path information table means, and 14 is an address for the optical signal terminator itself to change its own address autonomously. This is an own host address table means for holding information.

FIG. 3 is a block diagram showing a configuration example of the monitoring control device 4 in FIG. In FIG. 3, reference numeral 15 denotes an LTM communication unit for performing communication with the optical signal terminal, 16 denotes an address table unit for registering a subnet address representing a subnet, and 17 denotes a communication failure between the repeater and the LTM. If CONT recognizes the occurrence,
Of the two LTMs belonging to the failed subnet,
Secondary address table means for registering data for changing the subnet address of one of the LTMs, 18 is an information processing section, and 19 is communication for recording the communication status between the repeater and the LTM. This is a status management table means.

FIGS. 4 to 9 are explanatory views for explaining the operation of the embodiment shown in FIGS. FIG. 4 is an example of the contents of an address table for registering subnet addresses managed by CONT in the embodiment, and addresses used when no failure has occurred are registered. In addition, information for managing whether a failure is occurring for each subnet is also registered. And the address of subnet A is S
UB-1, which indicates that a failure has occurred. FIG. 5 is an example of the contents of a secondary address table for registering the secondary addresses of the respective subnets managed by the CONT in the embodiment. The addresses used when a failure occurs are registered. From FIGS. 4 and 5, it can be seen that a failure is occurring also at the address SUB-2.

FIG. 6 shows an example of the contents of the network route information table means 13 held by each LTM, indicating that a packet addressed to the SUB-1 subnet may be sent to SUB-A. FIG. 7 shows CONT in the embodiment.
9 shows an example of the contents of the communication status management table means 19 in which the repeater 3a belongs to SUB-1 after the occurrence of a failure.
This indicates that the repeater 3b and the repeater 3c belong to SUB-2. FIG. 8 shows an example of the contents of the communication state table means 12 held by the optical signal terminating device 31 (1) in the conventional example and the embodiment.
(1) indicates that communication is possible with the optical signal amplifier (repeater) 33a (3a), but not with the repeaters 33b (3b) and 33c (3c). FIG. 9 shows an address format used in the conventional example and the embodiment, and is composed of a network address section, a subnet address section, and an LTM address section.

Next, the operation of the embodiment shown in FIGS. 1 to 3 will be described with reference to FIGS. First, operation when no failure occurs and each optical signal termination device (LT
The address autonomous change function of M) is the same as the conventional example. Next, the operation of the optical signal termination device (LTM) differs from the conventional example in that the repeater 3a and the repeater 3 in FIG.
When a failure occurs between b and L, each LTM transmits the contents of the communication status table means 12 updated to the monitoring control unit (CONT) 4 due to the failure.

The CONT 4 having received this information records the contents in the communication status management table means 19. The communication state table means 12 held by the LTM 1 at this time
8 is as shown in FIG. 8, and the communication status management table means 19 in the CONT 4 is as shown in FIG. After the occurrence of the failure is notified to CONT4, the repeater 3
Since it is known from the conventional example that the packet should be sent to either SUB-1 or SUB-2 when the packet is sent from CONT4 to b, the communication status management table means 19 is checked, and the repeater 3b It turns out that it belongs to SUB-2 (FIG. 7). Therefore, the monitoring control information for the repeater 3b is transmitted only to SUB-2. As described above, by managing the communication status between the LTM and the repeater in the CONT4, the number of packet transmissions from the CONT4 can be reduced to one.

[0023]

As described above, the present invention provides a method for disconnecting an optical synchronous transmission line (optical fiber) in a network (subnet) including an optical signal amplifying device and an optical signal termination device connected by an optical synchronous transmission line. In the event of a failure that would result in the division of a subnet due to a failure, each divided device group is treated as a different subnet, and the monitoring and control unit notifies the failure notification and the communication status with the optical signal amplifier to each optical signal termination. Since the packet is received from the device and registered in the communication status management table, the transmission process of the packet after the occurrence of the failure can be performed only once by referring to the communication status management table when transmitting the packet. Having. In addition, since there is no need to perform a packet transmission process from the monitoring control device to the optical signal termination device 1, the packet transfer process can be eliminated, and the network use efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a network management system according to the present invention.

FIG. 2 is a block diagram illustrating a configuration example of an optical signal termination device in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration example of a monitoring control device in FIG. 1;

FIG. 4 is an explanatory diagram for explaining the operation of the embodiment of the present invention.

FIG. 5 is an explanatory diagram for explaining the operation of the embodiment of the present invention.

FIG. 6 is an explanatory diagram for explaining the operation of the embodiment of the present invention and the conventional example.

FIG. 7 is an explanatory diagram for explaining the operation of the embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining the operation of the embodiment of the present invention and the conventional example.

FIG. 9 is an explanatory diagram for explaining the operation of the embodiment of the present invention.

FIG. 10 is a block diagram illustrating a configuration example of a monitoring control device in a conventional example.

FIG. 11 is a block diagram showing an example of a conventional packet transfer system.

[Explanation of symbols]

 Reference numerals 1 and 2 Optical signal termination devices 3a to 3c Optical signal amplifiers 4 Monitoring and control devices 5 Subnets 6 Optical synchronous transmission lines 7 Monitoring and control information transfer network 9 Cont communication means 12 Communication status table means 14 Own host address table means 16 Address table Means 17 Secondary address table means 19 Communication status management table

Claims (1)

(57) [Claims] 1. A method in which a unique address is assigned to each of
Number of subnets and each subnet
Are connected in opposition via an optical synchronous transmission line.
Two optical signal terminators for terminating optical signals from the
Optical signal from the optical synchronous transmission line provided on the optical synchronous transmission line
And a plurality of optical signal amplifiers that amplify and transmit
In the optical synchronous transmission line network, each optical signal terminating device is connected via a predetermined supervisory control information transfer network.
Connected, and each optical signal termination device is connected via a supervisory control information transfer network.
To exchange various information with the
A monitoring control device that monitors and controls each subnet
In addition, the optical signal terminal includes its own address including the address of the subnet to which it belongs.
Host address table means to maintain the address and the address of the subnet to which it belongs when a failure occurs
Secondary address table that holds address information for
On the optical synchronous transmission line between the optical unit and the opposing optical signal termination device.
Monitoring to monitor failure notifications from each optical signal amplifier
If the failure notification is detected by the
Or, the secondary address text on one of the opposing optical signal termination devices
Autonomously change its own address with reference to
Is stored in the own host address table means.
Address stored in the address table
Notification information indicating the optical signal amplifier that can communicate with the
Communication control means for transmitting to the monitoring and control device , the monitoring and control device stores the address of each subnet and the presence / absence of occurrence of a failure.
Address table means and a secondary address for holding an address at the time of occurrence of a failure in each subnet.
Dress table means and an optical signal amplifier capable of communicating with each address of each subnet.
Communication status management table means for holding the information of the device, and from any optical signal terminating device through the supervisory control information transfer network.
Based on the received predetermined notification information , an address table
Stage, secondary address table means, and communication status management table.
Update the contents stored in the
When transmitting to an optical signal amplifier belonging to an arbitrary subnet
In this case, referring to the address table means,
Check whether a failure has occurred in the
Secondary address table means if a failure has occurred
And the subnet obtained from the communication status management table.
Information processing that sends monitoring control information based on the
Network management system characterized by having a physical means.