JPH0148573B2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Technical Field of the Invention The present invention provides an inter-host session establishment processing method, particularly in session establishment processing in inter-system communication, which sends a session establishment request to all hosts constituting a network. The host that receives this request determines whether the request is addressed to itself, and if the request is addressed to itself, returns a response to the requesting host. The present invention relates to a processing method for establishing sessions between hosts that allows a system to be started up by any host.

(B) Problems with the prior art In general, in a complex processing system using multi-host networking, each host sets up a communication management subsystem (DCMS) in advance to manage data communication between the hosts. In doing so, a so-called session is established in order to logically connect each communication management subsystem, etc. The communication management subsystem started on each host has its functions, number of connected terminals, and other environmental conditions determined by a predetermined subsystem definition, and the subsystem is uniquely identified in the system. A name is given.

By the way, conventionally, the network management department determines in advance on which host the communication management subsystem, which is given an identification name and whose attributes are determined by the above-mentioned definition body, is to be launched. Therefore, a host that needs to establish a session with a specific communication management subsystem must be aware of which host the communication management subsystem is under and issue a session establishment request. There was a problem that the processing became complicated. Furthermore, there was a problem in that it was not possible to flexibly handle cases where it became necessary to temporarily start up the above-mentioned communication management subsystem on another host due to, for example, a hardware problem with the host. .

(C) Purpose and Structure of the Invention The present invention aims to solve the above-mentioned problems, and makes it possible to identify which host a specific communication management subsystem is started on without the session establishment requester being aware of it. The purpose of this system is to enable a session to be established with a communications management system, and to enable a specific communications management subsystem to be started up on any host. Therefore, the inter-host session establishment processing method of the present invention is a method for establishing a session between hosts in a network system consisting of a plurality of hosts that operate a communication management subsystem that is started with an identification name given in advance. In response to a session establishment command that logically connects hosts that require this, the session establishment requesting host sends an establishment request by giving the identification name of the communication management subsystem to all other hosts. and a response receiving unit that receives a response from another host to the establishment request, and the other host includes an establishment request receiving unit that receives the session establishment request, and a response receiving unit that receives a response from the other host to the establishment request. A destination determination unit that determines whether the request is addressed to the own host based on the identification name, and a response transmission unit that transmits an acknowledgment to the session establishment requesting host when the request is addressed to the own host. It is a feature.
Embodiments will be described below with reference to the drawings.

(D) Embodiment of the Invention FIG. 1 is a diagram for explaining the outline of the present invention, and FIG. 2 shows the configuration of an embodiment of the present invention.

In the figure, 1A to 1D are hosts, 2A to 2D
3A to 3D are subsystem definition bodies, 4A to 4D are subsystem startup units, 5A to 5D are operator consoles, 10A and 10C are session establishment processing units, 1
1 is an establishment request transmitter, 12 is a response receiver, 13
A, 13C are establishment request receiving units, 14A, 14C are destination determining units, 15A, 15C are response transmitting units, 16
17 is a command processing unit, 17 is a command reception unit, and 18 is a command processing unit.
1 represents a command response section, and 19 represents a directory.

In FIG. 1, each of the hosts 1A to 1D making up the network has an independent processor (CPU) and processes data. Each host 1
The communication management subsystems 2A to 2D operating in A to 1D are components that control input and output of messages between terminals and application programs. In particular, it also controls message transmission and reception in host-to-host communication. Attributes regarding functions, environmental conditions, etc. of each communication management subsystem 2A to 2D are determined in advance by subsystem definition bodies 3A to 3D, respectively. The subsystem startup units 4A to 4D are connected to each host 1A to 1.
After IPLing D, e.g. operator console 5
The START command from A to 5D refers to each definition body 3A to 3D, and the communication management subsystem 2A has attributes according to the contents of definition bodies 3A to 3D.
~2D is started. Here, each of the hosts 1A to 1D can have a plurality of types of subsystem definition bodies, and the plurality of types of definition bodies are distinguished by predetermined subsystem identification names. Then, the attributes according to the definition body corresponding to the identification name specified at startup are set for each host 1A.
~Communication management subsystem 2A launched in 1D
~Given to 2D. Note that operating conditions are set so that two or more communication management subsystems 2A to 2D having the same identification name do not exist at the same time in the network system.

For example, communication management subsystem 2 of host 1A
Assume that A receives a session establishment command from the application program or the operator console 5A to instruct the establishment of a session with the communication management subsystem whose identification name is DCC. According to the conventional system, a host on which a communication management subsystem operates having a specific attribute represented by an identification name is fixedly determined in a network system. In the case of the present invention, a communication management subsystem defined by an identification name corresponding to a specific attribute can be started up on any host within the network system. The communication management subsystem 2A of the host 1A then communicates with the communication management subsystem whose identification name is DCC, which is the other party to establish the session.
There is no need to be aware of which host it currently exists on. Therefore, in establishing a session, the communication management subsystem 2A and the like process as follows.

First, the communication management subsystem 2A sends a session establishment request including the identification name of the intended session establishment partner=DCC to all other hosts 1B to 1D in the network system. The communication management subsystems 2B to 2D of each of the hosts 1B to 1D that received the session establishment request extract whether the request is addressed to its own host from the definitions 3B to 3D used at startup, or from the definitions. This is determined by referring to the created table and checking the identification name. If the identification names do not match, the session establishment request is ignored as the request is not addressed to the host itself. In this embodiment, since the identification name is DCC, the communication management subsystem 2C determines that the request is addressed to its own host, and returns an affirmative response to the host 1A. At this time, the physical ID of the host 1C is specified in the acknowledgment. The physical ID is an identifier that uniquely identifies each host within the network system, and the communication management subsystem 2A that received the acknowledgment uses the physical ID of the host at this time to determine the identification name = DCC. Recognize hosts with communication management subsystems. Thereafter, a session with the host 1C can be established and messages can be sent and received between the hosts.

For the above processing explained with reference to FIG.
The communication management subsystem etc. has a configuration as shown in FIG. 2, for example.

In FIG. 2, a host 1A is a host that issues a session establishment request, and the host 1A shown in FIG.
It corresponds to A. The host 1C corresponds to the host 1C shown in FIG. 1 with which the session is established. Note that the same applies to other hosts although they are not shown. The session establishment processing units 10A and 10C are
When performing communication between hosts, it processes requests for establishing a session and responses to those requests in order to logically connect communication subjects.

In accordance with the session establishment command notified from the command receiving unit 17 of the command processing unit 16, the establishment request transmitting unit 11 specifies the identification name of the subsystem specified at that time and sends a session establishment request to all other hosts. It is intended to send out. Note that the type of hosts existing in the network is notified in advance from the network management unit (not shown) through open processing at startup.
The response receiving unit 12 receives an affirmative response to a session establishment request. Since the positive response includes the physical ID of the host that has the communication management subsystem with the specified identification name, the identification name and physical ID are associated with each other, thereby recognizing the host with which the communication partner is communicating. When the session establishment is completed, the command response unit 18 is notified of the completion, and the command response unit 18
Notify the result to the session establishment command issuer such as the console.

The establishment request receiving section 13C receives a session establishment request from another host and activates the destination determining section 14C. The destination determination unit 14C recognizes the identification name of its own communication management subsystem 2C from the definition body 3C indicated by the directory 19 or a table created based on the information of the definition body, and determines the identity name of the communication management subsystem 2C. and the identification name specified in the session establishment request to determine whether the session establishment request is for the host itself. If the request is not for the own host,
ignore the request. On the other hand, if the identification names match and it is determined that the request is addressed to the own host,
Activate the response transmitter 15C. Response transmitter 15C
is used to return an affirmative response to the session establishment request to the host 1A using the physical ID of the host 1C as data. This makes it possible to establish a session between the hosts 1A and 1C.

Note that the establishment request receiving unit 13 in the host 1A
A, the destination determining unit 14A and the response transmitting unit 15A process session establishment requests from other hosts in the same way. The same applies to other hosts not shown.

(E) Effects of the Invention As explained above, according to the present invention, it is possible to start up a communication management subsystem with specific attributes on any host, and when a session establishment request is made, the communication management subsystem Since there is no need to be aware of which host the system resides on, communication between hosts can be made more flexible.
For example, it becomes easier to construct complex systems such as load balancing.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the outline of the present invention, and FIG. 2 shows the configuration of an embodiment of the present invention. In the figure, 1A to 1D are hosts, 2A to 2
D is a communication management subsystem, 3A to 3D are subsystem definition bodies, 4A to 4D are subsystem startup units, 5A to 5D are operator consoles, 10A and 10C are session establishment processing units,
11 is an establishment request transmitter, 12 is a response receiver, 13
A, 13C are establishment request receiving units, 14A, 14C are destination determining units, 15A, 15C are response transmitting units, 16
is a command processing unit, 17 is a command reception unit, 18
1 represents a command response section, and 19 represents a directory.

Claims (1)

[Claims] 1 Logically connects hosts that require data communication in a host-to-host session establishment processing method in a network system consisting of multiple hosts that operate a communication management subsystem that is activated with an identification name given in advance. In response to the session establishment command, the session establishment requesting host sends the session establishment request to all other hosts by giving the identification name of the communication management subsystem, and the establishment request sending unit that sends the session establishment request to all other hosts by giving the identification name of the communication management subsystem, and and a response receiving section for receiving a response, and
The other host includes an establishment request reception unit that receives the session establishment request, a destination determination unit that determines whether the request is addressed to the host itself based on the identification name of the received establishment request, and 1. A response transmitter that transmits an acknowledgment to the session establishment requesting host when the request is a request for a host-to-host session establishment processing method.