JPH0595360A - Network control device - Google Patents

Abstract

PURPOSE:To make it possible to control all the nodes on a network by plural sets of control device on the same network without a mismatching. CONSTITUTION:A communication information processing part 12 monitors information to be communicated on a coaxial cable 6 via a coaxial cable interface part 8 connected with a transceiver for coaxial cable 7. When a control information transmission request from a node and a response to the node of the control information from other network control devices as information exist, the information is transferred to a main storage part 10 via a system bus 9 and is stored. Next, the communication information processing part 12 retrieves a corresponding control information from a node control information storage part 11 and transmits it if the control information of the other network control devices is not received when the transmission request of the control information from the node exists. If the control information is received, the part 12 stores the control information received from the other control devices in a node control information storage part 11 of the present device and updates it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network management device, and more particularly to a network management device in a network having a bus type communication function.

[0002]

2. Description of the Related Art Conventionally, in this type of network management system, one management device on the network manages information about nodes belonging to a preset range, and nodes within the preset range are managed by the management device. This is a method of managing the entire network by communicating the management information in response to a request for transmission of the management information from the.

[0003]

In the above-mentioned conventional method, since one management device on the same network manages information related to communication about a preset node,
When a plurality of networks are connected by a bridge or the like, there is a drawback that a node which is not set in the management device or is out of the preset management range cannot be managed.

Further, when a plurality of management devices are set on the same network, there is a possibility that a plurality of management devices will respond to a transmission request of the management information from one node, and the information at that time. However, if the contents are different in the management device, there is a drawback that inconsistency of information occurs on the network and some nodes cannot communicate.

[0005]

A first aspect of the present invention is a composite network system in which a plurality of bus type communication systems using one transmission line as a communication medium are mutually connected by communication lines or the like. A network management device installed in each bus communication system that receives and responds to requests for transmission of management information such as an address for node identification used by the node for communication from all nodes connected to each bus communication system In the case of receiving a request for transmission of the management information from the node, if the response management information to the node of the other network management device has not been received, the node management information including the corresponding management information in advance. Transmitting the management information retrieved from the storage unit,
It is characterized by further comprising communication information processing means for updating the node management information storage unit with the response management information received from the other network management device if it has been received.

[0006]

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

FIG. 1 is a network system configuration diagram showing an embodiment using a network management apparatus of the present invention. FIG. 2 is an internal configuration diagram of a network management device showing an embodiment of the present invention.

In the network system of FIG. 1, the network management devices (1-1, 1-2, 1-) of the present invention are used.
3) is connected via a coaxial cable transceiver 5, coaxial cables (2-1, 2-2, 2-3) and repeaters or bridges (4-1, 4-2), and all of them are connected to the network. The node management is performed by recognizing the transmission request of the management information regarding the address and the like from the nodes (3-1 to 3-4) and returning the management information to the requesting node. At this time, all management devices on the network monitor the response to the request from the node of the other management device, and when it detects the response of the other management device, it prohibits its own response and responds to that node. Capture information,
By updating with the response information, each network management device manages all the nodes of the network with the same management information.

Next, the operation of the network management device will be described with reference to FIG.

First, the communication information processing unit 12 connected to the system bus 9 monitors the information communicated on the coaxial cable 6 via the coaxial cable interface unit 8 connected to the coaxial cable transceiver 7, and detects the information from the node. When there is a management information transmission request and a response of the management information from another network management device to the node, the information is transferred to the main storage unit 10 via the system bus 9 and stored therein. Then, in the case of a transmission request for the management information from the node, the communication information processing unit 12 searches the node management information storage unit 11 for the corresponding management information, and before transmitting the information, the management information of another network management device If not received, the management information of the own device is transmitted, and if received, the management information received from another management device is stored and updated in the node management information storage unit 11 of the own device.

With the above operation, the request for the management information from the node is responded to by the network management device which is the earliest one to transmit the information on the network, and the other network management device updates it with the response information. It becomes possible for each network management device to manage the entire network without inconsistency in information regarding nodes among all the network management devices connected to each other.

[0012]

As described above, according to the present invention, a request for management information from a node is responded by a network management device which is the earliest one on the network, and another network management device updates it with the response information. By doing so, there is an effect that each management device can manage all the nodes connected to the network without inconsistency.

[Brief description of drawings]

FIG. 1 is a network system configuration diagram showing an embodiment using a network management device of the present invention.

FIG. 2 is an internal configuration diagram of a network management device showing an embodiment of the present invention.

[Explanation of symbols]

 1-1, 1-2, 1-3 Network management device 2-1, 2-2, 2-3 Coaxial cable 3-1, 3-2, 3-3, 3-4 Node 4-1, 4-2 Repeater or bridge 5 Coaxial cable transceiver 6 Coaxial cable 7 Coaxial cable transceiver 8 Coaxial cable interface section 9 System bus 10 Main storage section 11 Node management information storage section 12 Communication information processing section

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H04L 12/24 12/26

Claims (1)

[Claims] 1. A complex network system in which a plurality of bus type communication systems using one transmission line as a communication medium are mutually connected by communication lines or the like, all of which are connected to each of the bus type communication systems. In the network management device installed in each of the bus type communication systems that receives and responds to a request for transmission of management information such as an address for node identification used by the node for communication from the node, When the transmission request is received, if the response management information to the node of the other network management device has not been received, the corresponding management information is searched from the node management information storage unit provided in advance and the searched management is searched. If the information is transmitted, and if received, the node management information is obtained from the response management information received from the other network management device. Network management apparatus characterized by having a communication processing means for updating the 憶部.