JPH0783357B2 - Switching node restart recognition method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a TCP / IP (Transmissi) as a protocol between a switching node and a network management device.
The present invention relates to a method of recognizing the restart initialization of a switching node in a network system using on Control Protocol / Internet Protocol.

[0002]

2. Description of the Related Art Conventionally, as a TCP / IP, a connection or port is provided between a switching node and a network management device of such a system, a network management device side is a client, and a network management device side is a client.
Communication was performed by setting the exchange node side as a server.

[0003]

Therefore, when the restart initialization of the switching node occurs due to a failure or the like in the switching node, in TCP / IP, the port on the switching node side is the server side, and therefore the client side. Could not be notified. That is, the network management device monitors the switching node and the like, and it is necessary to collect data from the switching node in order to analyze the cause when a failure occurs. However, when the restart initialization of the switching node occurs during the normal operation as described above,
Since the switching node side cannot notify the network management device of the restart processing setting, there is a problem that the network management device cannot recognize the restart initialization of the switching node.

An object of the present invention is to make it possible for the network management device side to automatically recognize the restart initialization of a switching node.

[0005]

According to the present invention, a network management device and a switching node are connected to each other through an information transfer port, and both of them are provided with means for transferring information by TCP / IP protocol. In the restart recognition method,
The network management device and the switching node each include a port for restart initialization notification separately from the information transfer port, and the network management device sends a connection request from the switching node to the restart initialization notification port. The switching node is provided with means for monitoring, performing a restart initialization process for the switching node when there is a connection request, and transmitting a response signal from the restart initialization notification port to the switching node. In order to disconnect the restart initialization notification port by making a connection request with the restart initialization from the restart initialization notification port after setting and receiving a response signal from the network management device. And a means for transmitting the disconnection request signal from the restart initialization notification port.

[0006]

The restart initialization notification of the switching node is performed not by the normal information notification port, but by the restart initialization notification port of which the network management device is the server and the switching node is the client. When the restart initialization is performed, the switching node makes a connection request to the network management device through this port, and the network management device recognizes the restart initialization of the switching node by this notification. The network management device notifies the response signal through this port and resets the information notification port of the switching node. Upon receiving the response signal from the network management device, the switching node issues a disconnection request for this port to the network management device and releases the restart initialization notification port. As a result, the network management device recognizes the restart initialization of the switching node by a connection request from the switching node via a port other than the normal port, so that information can be collected or commands, etc. can be notified using the normal information notification port. it can.

[0007]

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

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, showing a connection relationship between a network management device 1 and a switching node 2. The network system configured in this embodiment is T
This is an information transfer system based on the CP / IP protocol.
The network management device 1 includes a socket monitoring device (SCS) 11 that monitors arrival of a connection request signal, and the switching node 2 includes a restart initialization control device (IPS) 21 that controls restart initialization of the node. ing. Further, the network management device 1 has ports A and B as TCP / IP ports, and the exchange node 2 corresponds to these TCP / IP.
Ports C and D are provided as ports. However, these port A and port D are clients,
Ports B and C function as servers.

In this embodiment, as a feature of the present invention, the network management device 1 and the switching node 2 are provided with an information transfer port A,
Separately from C, ports B and D for restart initialization notification are provided,
The network management device 1 monitors a connection request (SYN (2)) from the switching node to the restart initialization notification port B, and when there is a connection request, performs restart initialization processing of the switching node 2 and The switching node 2 includes means for transmitting a response signal (ACK (2)) from the restart initialization notification port B to the port D of the switching node, and the switching node 2 sends the restart initialization notification port D to the network management device 1 after restart initialization. By making a connection request (SYN (2)) by restart initialization and receiving a response signal (ACK (2)) from the network management device,
A disconnection request signal (FIN) for disconnecting the restart initialization notification port is sent to the restart initialization notification port D.
And means for sending from.

Next, the operation of this embodiment will be described with reference to the drawings.

FIG. 1 shows a network management device 1 and a switching node 2 which is a management target thereof. The network management device 1 includes a client port A for performing normal information transfer and a server port B for notifying restart initialization. Similarly, the exchange node 2 also includes a server port C for performing normal information transfer and a client port D for notifying restart initialization. The socket monitoring device 11 of the network management device 1 uses the port B
It monitors whether or not there is a connection request, that is, whether a socket has been created, and if so, the switching node 2
Resuming that the initialization has occurred, the connection from port A to port C is reset (this means resetting the communication path). When the restart initialization occurs in the switching node, the restart initialization control device 21 of the switching node 2 sends a connection request signal SYN (2) from the clant port D to the port B of the network management device 1 and sends a response signal to the connection request signal SYN (2). ACK
When (2) arrives, the port release operation is performed in preparation for the next restart initialization.

First, the normal information communication operation will be described with reference to the system state diagram of FIG. 2 and the sequence diagram of FIG. This operation is the same in the conventional case.

In the case of normal information transfer, a connection request signal SY
N (1) and a response signal ACK (1) thereto are transmitted and received between port A and port C (FIG. 2 (a)).
As a result, normal information transmission becomes possible, and data (1) and data (2) are transmitted and received (FIG. 2 (b)).
When a connection request signal is generated in each port, port A is expressed as "A '", for example.

Next, referring to FIGS. 4 and 5, the operation of the switching node at the time of restart initialization will be described.

FIG. 4A shows a state immediately after the switching node 2 is restarted and initialized in the state shown in FIG. 3B. At this time, the port C of the exchange node 2 is initialized, and since it is the server side, no signal is output to the port A of the network management device 1. At this time, the port A of the network management device 1 remains in the "A '" state. At this time, the restart initialization control device (IPS) 21 sends a connection request signal SYN (2) to the port B of the network management device 1 using the port D which is the client port. Connection request signal SYN
The network management device 1, which has received (2) at the port B, returns the response signal ACK (2) from the port B, and the socket monitoring device (SCS) 11 confirms this, and the switching node 1 restarts initial stage. Recognize that it has been set. As a result, the ports B and D are once brought into the "B '" and "D'" states.

After that, the socket monitoring device 11 recognizes the restart initialization of the exchange node 1 and then resets the port A (resets the communication path from the port A), sets the port A to "A '", and connects. Request signal SYN (3), response signal A
Receive CK (3). This enables normal information transfer. Also, this time, the switching node 2 side initializes the release of ports B and D. That is, the restart initialization control device 21 initializes the port D by sending a disconnection signal FIN from the port D to the port B and receiving a response signal ACK (4) in preparation for the next restart initialization. That is, the state of "D '" is set to the state of "D".

By this series of operations, even when the switching node 2 is restarted and initialized, data can be transmitted and received as shown in the sequence of FIG. 5, and the network management device 1 can collect necessary information.

In this way, the switching node 2 is provided with a client port and the corresponding network management device 1 is provided with a server port, and the generation of the connection request signal for that port is monitored to recognize the restart initialization of the switching node 1. It is possible to collect information for necessary monitoring and control.

[0019]

As described above, there is an effect that the network management device side can recognize the occurrence of the restart initialization of the switching node, which cannot be recognized by the client port for the original information transfer.

[Brief description of drawings]

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

FIG. 2 is a diagram illustrating a normal information transfer operation.

FIG. 3 is a sequence diagram illustrating a normal information transfer operation.

FIG. 4 is a diagram illustrating an operation after restart initialization.

FIG. 5 is a sequence diagram illustrating an operation after restart initialization.

[Explanation of symbols]

 1 Network Management Device 2 Switching Node 11 Socket Monitoring Device 21 Restart Initialization Control Device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04M 3/00 E 7406-5K 3/22 Z

Claims (1)

[Claims] 1. A network management device and a switching node are connected via an information transfer port, respectively, and both are TCP / IP.
In a restart recognition method for a switching node including means for performing information transfer according to a protocol, the network management device and the switching node each include a port for restart initialization notification separately from the information transfer port, and the network management device Monitoring a connection request from the switching node to the restart initialization notification port, performing a restart initialization process on the switching node when there is a connection request, and sending a response signal thereof to the restart initialization notification port. From the network management device to the switching node after the restart initialization, the switching node sends a connection request by the restart initialization to the network management device from the restart initialization notification port. By receiving a disconnect request signal for disconnecting the restart initialization notification port, the restart initialization notification port Resume Recognition of switching node comprising means for sending from.