JPH09331360A - Inter-network relay device - Google Patents

Abstract

(57) An object of the present invention is to provide an inter-network relay device that can normally transfer asynchronous data or data requiring isochronism. An inter-network relay device that connects a LAN and an ATM network to each other and relays and transfers a data frame is divided into ATMs when the data frame is relayed from the LAN to the ATM network. Cellizing means, input physical port, destination physical address in data frame, protocol type, destination network address, application identifier, and means for discriminating data, and statically or dynamically during signaling to ATM network. , And a means for setting the QOS class by the above-mentioned data discriminating elements individually or in combination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-network relay device for performing LAN-ATM conversion in a communication system.

[0002]

2. Description of the Related Art In an existing data-centric LAN,
When relaying the data frame from the LAN line to the ATM network, the inter-network connecting device converts the data frame into ATM cells without setting the QOS class.

[0003]

In recent years, even computer networks have come to handle multimedia data such as voice and image data. Such multimedia data is required to have a low delay quality of service (QOS) with respect to transmission performance. However, as described above, in the conventional inter-network relay device, even when the relay data is data such as a voice moving image, isochronism is not guaranteed because the QOS class is not set, and normal communication cannot be performed. There is a problem that there is.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to normally perform asynchronous data transfer or data transfer requiring isochronism.

[0005]

In order to achieve the above object, an inter-network relay device of the present invention connects a LAN (local area network) and an ATM (asynchronous transfer mode) network to each other to relay and transfer a data frame. An inter-network relay device for performing processing, means for dividing a data frame into ATM cells when the data frame is relayed from the LAN to the ATM network, an input physical port, and a destination physical address in the data frame Means for discriminating data according to the protocol, protocol type, destination network address, application identifier, and ATM
When signaling to the network, the QOS can be statically or dynamically obtained by individually or in combination with the above data discriminating elements.
And means for setting a class.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a flow chart from the reception of a data frame from the LAN line of the present embodiment to the start of the data transfer to the ATM network. Hereinafter, a description will be given along the flow chart.

FIG. 2 is a block diagram showing an example of the configuration of an inter-network connecting device according to an embodiment of the present invention. The LAN may be Ethernet, FDDI, token ring, or the like.

In FIG. 2, an inter-network connection device 20 is provided.
In the case of 0, the LAN controller 203 receives a data frame from the LAN line 201. LAN controller 20
3 transfers the data frame to the buffer 205 and sends an interrupt signal to the control unit 207. The control unit 207 checks the destination physical address of the data frame in the buffer 205 through the buffer management 206. If a call has already been set up for the destination physical address, the control unit 2
07 sends an interrupt signal to the ATM controller 204 and sends a data frame to the ATM controller 204 through the buffer management 206.
Transfer to the TM controller 204. The ATM controller 204 converts the data frame into ATM cells and starts data transfer through the ATM line 202. When the call is not yet set up for the destination physical address of the data frame, the control unit 207 determines the QOS based on the following information.
Get the class.

(1) When setting a QOS class for each input physical port The QOS management table 208 is referred to based on the input physical port number notified from the LAN controller 203.

(2) When setting a QOS class for each destination physical address The destination physical address in the frame header is checked to determine the QOS class.
Refer to the management table 208.

(3) When setting the QOS class for each protocol type The protocol type (I
POS, IPX, Appletalk, etc.)
Refer to the management table 208.

(4) When setting a QOS class for each destination network I if the data part in the data frame is an IP packet
The destination IP address in the P header is checked and the QOS management table 208 is referenced.

(5) QOS for each application identifier
When setting a class I if the data part in the data frame is an IP packet
The destination port number in the UDP / TCP header in the data portion of the P packet is checked and the QOS management table 208 is referenced.

This QOS class is put in and the ATM controller 204 is used to send an ATM to the destination physical address.
Make a call setup request to the network.

When the call setup is established, data transfer is started according to the above procedure. If the call setup request is rejected because the QOS class does not match, a QOS class that is one class lower is set, and if the QOS class is the lowest, no QOS class is set and the call setup request is repeated until the call is established. . When the call setup is established, the data transfer is started according to the above procedure.

FIG. 3 shows the QOS class setting conditions 4 and 5 described above.
It is an example of the QOS management table which combined. Here, when the voice data as shown in FIG. 4 is received and the call setup request is not rejected and data transfer is performed based on the above procedure,
QOS class 1 is set from Figure 3 and voice data is AT
L is guaranteed to be transferred isochronously over the M network,
A voice call via AN-ATM becomes possible.

[0018]

According to the present invention, data requiring isochronism such as voice and moving images and asynchronous data such as file transfer can be transmitted by A
Since it is possible to mix in the TM line, LAN terminal-
Multimedia data can be communicated between LAN terminals, and between LAN terminals and ATM terminals, and the availability of communication systems is enhanced. By setting the QOS class so as to increase the priority of online data, real-time processing can be efficiently used.

[Brief description of drawings]

FIG. 1 is a flowchart of QOS class setting according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an inter-network connection device according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating a QOS management table according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of a data frame in an embodiment of the present invention.

[Explanation of symbols]

200: inter-network connection device, 201: LAN line, 202: ATM line (ATM network), 203: LAN
Controller, 204: ATM controller, 205:
Buffer 206: buffer management, 207: control unit, 20
8: QOS management table.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yasushi Shibata 810 Shimoimaizumi, Ebina City, Kanagawa Prefecture Office Systems Department, Hitachi, Ltd. (72) Nobuhiko Yamamura 810 Shimoimaizumi, Ebina City, Kanagawa Hitachi, Ltd. Office System Division

Claims (1)

[Claims] 1. An inter-network relay device for interconnecting a LAN (local area network) and an ATM (asynchronous transfer mode) network to perform a relay transfer process of a data frame, wherein the data frame is transferred from the LAN to the ATM.
Means for dividing the data frame into ATM cells when relaying to the network, and means for discriminating data based on the input physical port, the destination physical address in the data frame, the protocol type, the destination network address, and the application identifier, At the time of signaling to the ATM network, QOS (Quality Of S
service) an inter-network relay device having means for setting a service class.