Inter-network connecting device

Details Inter-network connecting device Inter-network connecting device

1998-04-17

2000-05-16

Maung, Zarni

Electrical computers and digital processing systems: multicomput

Multiple network interconnecting

709250, G06F 1300

Patent

active

060650648

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an inter-network connecting devise which transmits a message having a protocol according to a plurality of protocol layers respectively defined as a physical layer to upper layers. The inter-network connecting device is disposed between plural networks and has a function of connecting these networks to each other at a specific protocol layer, and which is used for transmitting a message including its destination address data from a sender to its destination which are in different networks. The invention relates particularly to a network connecting apparatus which makes it possible to efficiently perform such processes as a transmission path determining process and the like in a network connecting apparatus by reducing looping processes or replacing them with comparatively simple processes mainly with regard to such processes which have been up to now complicated and time-consuming as a process of extracting a network address or a subnetwork address from the destination address of a received message (received frame) and the like, and thereby makes it possible to improve the processing speed and make a cost reduction by simplification of the hardware to be used, and be formed into hardware as a whole.


BACKGROUND ART

Such a telephone network built for the purpose of intercommunication by voice as a public line of telephone communication, a leased line, and the like is restricted in transmission quality and transmission speed when being used in data communication. Therefore, public digital data networks more adaptive in such characteristics specific to data communication as data traffic characteristics and the like are being built up in various countries including Japan. The public digital data network uses transmission paths and switching systems for digital signals, and some services by circuit switching networks or packet switching networks are provided in Japan. For international connection also, international standardization is promoted by the International Telegraph and Telephone Consultative Committee (CCITT), and at present has been almost provided as recommendations (X-series Recommendations) related to such new data networks as circuit switching systems, packet switching systems, leased digital lines, and the like.
In recent years, a network called a Local Area Network (LAN) has been widely used for the purpose of sharing such information (data) as a database or the like and peripheral apparatuses. The LAN is a network for connecting digital apparatuses such as computers, communication terminals and the like distributed in such a limited specific area as an office, a factory, a laboratory, a university and the like, and has a kind of switching function. In such a LAN also, standardization of protocols and the like has been performed by Committee 802 of the Institute of Electrical and Electronic Engineers (IEEE), the International Standardization Organization (ISO) and the like.
The reference model for the Open Systems Interconnection (OSI) being applied to a public digital data network and the above-mentioned LAN protocol standardized by IEEE are defined by plural protocol layers which are defined as a physical layer to upper layers. Protocols used widely in Wide Area Networks (WAN) or other LANs and the like also are generally defined according to plural protocol layers. In such a way, most network protocols are defined according to plural protocol layers.
Plural networks such as LANs, WANs, public digital networks, or the like have been connected with one another up to now. For example, even networks which have at least a few protocol layers different from one another out of a plurality of protocol layers to define a protocol for a message to be transmitted have been connected with one another up to now.
Hereupon, an inter-network connecting device for connecting with each other through the second layer two networks which have the same Media Access Control (MAC) layer which is the second layer for OSI is called a bridge or the like. An inter-netw

REFERENCES:
patent: 5103444 (1992-04-01), Leung et al.
patent: 5251205 (1993-10-01), Callon et al.
patent: 5684954 (1997-11-01), Kniserswerth et al.
patent: 5822319 (1998-10-01), Nagami et al.
patent: 5835710 (1998-11-01), Nagami et al.

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