JPH0371744A - network address method - Google Patents

Abstract

PURPOSE:To use one and same line in common by using an identifier expressing a network architecture being a communication means as a selector value added to a network address and designating the identifier at the start of communication so as to identify up to the end system. CONSTITUTION:Network architecture identifies alpha, beta, gamma are added to a network address of its own system in which communication parties make communication at the start of communication so as to identify dynamically the network architecture. The network architecture identifies alpha, beta, gamma added to the network address. They are used as selectors for the network address and specified as optional codes on a protocol as N selector. The network architecture identifies alpha, beta, gammaadded to the address act like part of the protocol at the start of communication and when the systems unable to recognize act like dissident communication protocol. Thus, malfunction making illegal communication with the systems not interpreting the network architecture identifies alpha, beta, gamma is not caused.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention identifies different network architectures when they exist in the same system, and communicates with each other without contradiction even when multiple network architectures coexist. Regarding network addressing schemes.

[Prior art] In order to connect computers and workstations through communication lines and perform data communication, the logical structure of a network,
There are network architectures that define protocols, and each company defines their own network architecture to enable communication between systems. For example, Hitachi, Ltd. uses HNA (Hitachi Network Arc
A network architecture called Nikkei DataPro Datacom
HMA/EX (DCl-250-801-12)J
(Published by Nikkei McGraw-Hill, June 1988). On the other hand, r
SO (International Organization for Standardization) is a 08I (○pen S ys
tems interconnection) is being established as an international standard.

Conventionally, as a network architecture, for example, HMA
When ○SI is newly implemented in a product that uses ○SI, HMA and O8I are identified by providing separate connection ports for devices and systems. For example, in the case of a computer connected to a packet-switched network, it has separate lines to the packet-switched network to which HMA is applied and to the packet-switched network to which O8I is applied. From the perspective of the person communicating with the computer, the computer is given two or more numbers, making it appear as if it were a separate device.

○The most relevant standardization activity of SI is rIso 15, which specifies the format and content of network addresses used to identify end systems connected to networks.
There is 8348/AD2J.

According to this regulation, it is assumed that one system is composed of one end system.

In other words, addressing in a configuration where multiple end systems coexist within one system is not considered.

[Problems to be Solved by the Invention] The above-mentioned conventional technology does not consider the configuration in which multiple architectures exist on the same system and they share the same line, resulting in duplication of equipment and high costs. There's a problem.

It is an object of the present invention to provide a network addressing system that shares the same line and optimizes the necessary equipment when a plurality of network architectures coexist on the same system.

[Means for solving the problem] In order to achieve the above purpose, a network architecture identifier is added to the network address of the own system that communicates between communication partners at the start of communication, and the network architecture is dynamically identified. This is what I did. The network architecture identifier is added to the network address. This is defined as a network address selector, and is defined as an N selector as an option on the protocol.

[Operation] The network architecture identifier added to the address operates as part of the protocol at the start of one communication, and between systems that cannot recognize it, it operates as a mismatch in communication protocols. This prevents malfunctions such as unauthorized communication with systems that cannot interpret the identifier.

The reason why it is specified as an option is that the future direction is basically to apply ○SI for mutual communication between different types of systems, and in order to maintain interconnectivity when using O8I, O8I Consideration must be given to not specifying the identifier. That is, in a system where O8I and other network architectures coexist, it is necessary to identify the end system of a network architecture other than O8I.

[Example] An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, data communication systems (hereinafter simply referred to as systems) 11, 12, and 13 are connected to a network 10. When each of the systems 1 to 13 communicates data with other systems, the data communication is performed based on a protocol that determines the rules for data communication.

There are various data communication regulations, such as those based on network architectures specific to each manufacturer (for example, HMA), those based on the international standard ○SI network architecture, and even those based on market standard network architectures. Each of these architectures has its own characteristics, and until they are unified into a single network architecture, they will coexist while exhibiting the characteristics of each architecture.

There are two types of coexistence of multiple network architectures: cases in which they coexist in the same network, and cases in which they coexist in the same system. The way each system is identified within a network is by the number that the network assigns to each system. Regarding this numbering, there are standards established by international organizations such as the International Numbering System, and unique numbers are assigned based on these standards. In FIG. 1, system 11
1 coexists two end systems each employing different network architectures, OSI and HMA, and systems 12 and 13 each include one end system. Nl, N2. N3 indicates the network address that each system has.

FIG. 2 shows an identification method when a plurality of types of end systems 21 to 23 exist within the same system 20. An end system refers to a system that uses a network. Specifically, an end system that is higher than the network layer is composed of a specific network architecture and one or more applications based on it. Traditional systems consist of only one end system. If the system consists of one end system, end system identification within the system is not required, and system identification within the network is sufficient. This is an N5AP that the network layer presents as a service access point to upper end systems.
This can be achieved by associating the address attached to the ce Access Port) with the system identification. However, when multiple end systems coexist within the same system, end system identification within the system is required in addition to system identification. This is α, β, γ in Figure 2.
corresponds to

Figure 3 shows the network address (N
This shows an address format consisting of an SAP address (abbreviated as N address) and an N selector that identifies an end system. Network addresses are OSI international standards (
The format and contents are defined in ISOl58348/AD2), and the format and content thereof shall be followed. According to this provision,
There are multiple end systems within the system and the idea of identifying them is not included.

The N selector is 1 octet long, and is based on the type of network architecture unique to the end system (α above).
, β, γ). The N selector is required when multiple end systems exist within the same system. Even if there are multiple end systems in the same system, if the end system is OSI, or if there is only a single end system in the same system, the N selector can be omitted. . This results in
It maintains interoperability with other systems based on OSI.

The address including the N selector is transferred in a connection establishment request when establishing a network connection. The system that receives the connection establishment request interprets the first network address (N address) based on the O8I regulations, and then checks whether there is an N selector and interprets the N selector. If the N selector is null, it means that there is only a single end system in the system, or that it represents an OSI end system even if there are multiple end systems. The system issuing the connection establishment request similarly adds the identification (N selector) of the end system issuing the connection establishment request as the address of the originator δ and transmits it.

FIG. 4 is a flow diagram showing the processing of the system when a call establishment request is received. First, upon receiving a call establishment request, it is determined whether there are multiple end systems in the own system (step 40). If there is one end system, step 4
Proceed to step 1 and select the end system that your system has. If there are multiple end systems in the own system, the process advances to step 42 and it is determined whether the N selector is specified. If not specified, the internal N selector is set to ○SI end system (step 43).

If the N selector is specified, the end system corresponding to the N selector (or the O
8I end system) is present in the own system (
Step 44). If there is, the end system to be specified is selected (step 45), and if not, a response to the partner system is sent to deny establishment of the connection (step 46).

[Effects of the Invention] The present invention enables a configuration in which a plurality of end systems coexist within the same system. This allows the existing network architecture and the various applications built on top of it to continue to be used as is. and.

New network architectures and higher-level applications can be developed and used on the same system. This has the effect of allowing users to maintain continuity in the use of existing applications and new applications during the transition period when switching network architectures.

Furthermore, the network architecture is not primarily a part that users directly touch, but rather has many factors that depend on the product specifications of the provider (manufacturer). However, the reality is that the types and contents of higher-level applications are closely related to the network architecture, and from the user's perspective, there are many cases in which the network architecture is determined as a result of selecting an application. In other words.

The use of different applications results in the use of different network architectures. The present invention has made it possible to run multiple applications on the same system.

According to the present invention, it is possible to unify the connection ports (lines, etc.) between the network and the system. Conventionally, the same system was identified by providing connection ports corresponding to the type of end system, but now they can be integrated into one, which has the effect of simplifying the configuration and reducing configuration costs.

[Brief explanation of drawings]

Fig. 2 shows an embodiment of the present invention, and shows the configuration of a system connected to a network. Fig. 2 shows a configuration in which multiple network architectures coexist in the same system. Fig. 3 shows network addresses and selectors. FIG. 4 is a flowchart showing the processing of the system when a call establishment request is received. 10...Network, 11.12.13.20...System, Kura1me Sai2(2) Sai3('i

Claims (1)

[Claims] 1. In a configuration where systems such as computers and workstations are connected to a network, and multiple end systems with different network architectures coexist in one system, in order for any system to communicate with each other, it is necessary to connect the system of the communication partner. In addition to the identifying number (network address), an identifier that uniquely expresses the network architecture used as the means of communication is specified, and this is added as a selector value to the network address, and by specifying it at the start of communication, the end system A network address system that is characterized by the ability to identify up to