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Converter and communication control method

a technology of converters and control methods, applied in the field of converters and communication control methods, can solve the problems of increasing costs, high maintenance costs of lines connecting a plurality of atm exchanges or a plurality of sites, and the cost of mac address management servers is relatively high, so as to reduce the cost of a network system and simplify the configuration.

Inactive Publication Date: 2009-02-12
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028]Summarizing the effects of the invention, there is provided a converter connecting an ATM network including an ATM exchange with a plurality of other converters through a LAN and having a relative simple configuration and including an address translation table. Therefore, it is possible to reduce the costs of a network system. The address resolution for transmitting cells across ATM networks as frames through the LAN can be performed by the address translation tables of the converters. The address translation tables for this address resolution can be built efficiently and autonomously by the transfer of VPI-MAC resolution frames or other special frames.
[0029]Turning now to the best mode for working the invention, referring to FIG. 1 and FIG. 2, the converter of the present invention is a converter (any one of 2-1 to 2-3) connecting an ATM network with a plurality of other ATM networks through a LAN 3 and provided with an address translation table 24 storing external VPI / VCIs showing the destinations of cells for transmission from the ATM network, internal VPI / VCIs uniquely assigned to the LAN 3, and opposing MAC addresses for opposing converters (others of 2-1 to 2-3) connected to the LAN 3 in correspondence and a processing unit 21 for performing control for transmitting, to the LAN 3, frames changed from the external VPI / VCIs of headers of cells from ATM network to internal VPI / VCIs by referring to the address translation table 24 and having opposing MAC addresses corresponding to the internal VPI / VCIs attached, removing the opposing MAC addresses of frames received from the LAN 3 by referring to the address translation table 24, and transmitting cells changed from internal VPI / VCIs to external VPI / VCIs to its ATM network.
[0030]Further, the communication control method of the present invention is achieved in a network system comprised of a plurality of ATM networks connected by converters 2-1 to 2-3 to a LAN 3, comprising a step of having each of the converters 2-1 to 2-3 be provided with an address translation table 24 and control processing unit 21, broadcast, to the LAN 3, a VPI-MAC resolution frame or other special frame including an internal VPI / VCI corresponding to an external VPI / VCI indicating the destination of a cell transmitted from its ATM network and uniquely assigned to the LAN and its own MAC address, a step of having a converter recognizing the internal VPI / VCI of the special frame and receiving the frame transmit, to the LAN 3, a reply frame having a source MAC address of the special frame as a destination MAC address and having its own MAC address as a source MAC address, and a step of having a converter receiving the reply frame register and set in an address translation table 24 the external VPI / VCI, the internal VPI / VCI, and the source MAC address of the reply frame as the opposing MAC address in correspondence.

Problems solved by technology

It has various advantages, but the cost of maintenance of lines connecting a plurality of ATM exchanges or a plurality of sites is high, so there is the problem of increased costs.
However, a MAC address management server would be relatively expensive and would have to be provided for each ATM exchange, so there would be the problem that even use of a LAN would not enable the costs to be sufficiently reduced.

Method used

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Examples

Experimental program
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Effect test

example 1

[0031]FIG. 1 shows a network system of the present invention. In the figure, 1-1 to 1-3 show ATM exchanges or ATM networks including ATM exchanges, 2-1 to 2-3 show converters, and 3 shows a LAN serving as the above-mentioned Ethernet® network. That is, the network is configured by a plurality of ATM networks including the ATM exchanges 1-1 to 1-3 connected through the converters 2-1 to 2-3 and the LAN 3. Note that the ATM exchanges can be provided in a greater number and be connected through the converters by the LAN 3 as well. Alternatively, all or part of the LAN 3 can be comprised by a wide area LAN.

[0032]FIG. 2 shows principal parts of a converter 2 corresponding to the converters 2-1 to 2-3 in FIG. 1. Reference numeral 21 shows a control processing unit (CPU), 22 an ATM interface (ATMIF) for connecting with the ATM networks 1-1 to 1-3, 23 a LAN interface (LANIF) for connecting with the LAN 3, and 24 an address translation table.

[0033]The control processing unit 21 is comprised ...

example 2

[0047]FIGS. 7A and 7B show flow charts of Example 2 of the present invention and shows the case of application of the IPv6 based on the RFC (Request for Comments) 2373. FIGS. 8A and 8B show the address configuration of this IPv6 . As shown in FIG. 8A, this is a 128-bit configuration comprised of a 64-bit network part and a 64-bit host part. The network part is comprised of a 48-bit public topology and an 18-bit site topology. FIG. 8B shows the case of setting the internal VPIs in the site topology and making the host part (interface ID) all “1” for broadcasting.

[0048]In FIGS. 7A and 7B, the converters 2-1 to 2-3 shown in FIG. 1 are designated as A, B, and C. Each of these converters A, B, and C, as shown in FIG. 2, is configured including a control processing unit 21, ATM interface 22, LAN interface 23, and address translation table 24. The control processing unit 21 in Example 2 has the function of generating addresses based on the IPv6. In the same way as the initial state of the ...

example 3

[0053]FIG. 9 shows a flow chart of Example 3 of the present invention. Here, the converters 2-1 to 2-3 shown in FIG. 1 are designated as A, B, and C. Each of the converters A, B, and C, as shown in FIG. 2, is configured including a control processing unit 21, an ATM interface 22, a LAN interface 23, and an address translation table 24. The control processing unit 21 in Example 3 has the function of broadcasting a VPI-MAC resolution frame (Request) for a predetermined period. The function in this case may also be provided at all of the converters. In this case, each converter preferably is given a different transmission cycle or transmission timing. It is also possible to provide this function at just the important converters.

[0054]In the same way as the initial state in FIGS. 5A and 5B, the address translation table of the converter A is set with the internal VPI: 70 corresponding to the external VPI: 100 and the internal VPI: 71 corresponding to the external VPI: 101, the address t...

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Abstract

A converter for connecting its ATM network with other ATM networks through a LAN, which is provided with an address translation table storing external VPIs, internal VPIs uniquely assigned to the LAN, and opposing MAC addresses for opposing converters in correspondence and a processing unit for performing control for transmitting, to the LAN, frames changed from the external VPI / VCIs of headers of cells from its ATM network to the internal VPI / VCIs by referring to the address translation table and having opposing MAC addresses corresponding to the internal VPI / VCIs attached, removing the opposing MAC addresses of frames received from the LAN by referring to the address translation table, and transmitting cells changed from internal VPI / VCIs to external VPI / VCIs to its ATM network.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a converter having an address translation function and a communication control system in a network system including such a converter.[0003]2. Description of the Related Art[0004]In the past, as a network system for transmitting various types of data, for example, an asynchronous transfer mode (ATM) network, Ethernet® network (hereinafter explained as a “local area network (LAN)” or “wide area LAN”), etc. are known. An ATM network breaks down data into 48-byte cells, adds 5-byte headers to these, and transmits the resultant 53-byte cells. It transmits the data to the opposing side at a high speed in accordance with virtual path identifiers (VPI) and virtual channel identifiers (VCI) at headers of the cells. Further, a LAN adds the source address and destination address to the headers to compose frames for transmission. For example, there are known the 100BASE-FX, 100BASE-T, 1000BASE-LX, 1...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L12/56H04L12/46H04L12/70
CPCH04L12/5601H04L2012/5618H04L2012/5685H04L2012/5665H04L2012/5642
Inventor NAKAGAKI, SHINYAINOUE, TOSHIKAZUKUMAZAKI, KAZUYAHATTORI, MINEHARUICHIKAWA, TETSUJIIGUCHI, NOBUOMORIMOTO, AKIOKUSAYANAGI, MICHIO
Owner FUJITSU LTD