JP3173499B2 - ATM device supporting multiple IP addresses - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchro
The present invention relates to a network device, and more particularly to a multiple IP address support device that uses a plurality of IP (Internet Protocol) addresses and can perform ATM communication.

[0002]

2. Description of the Related Art An AT having an IP over ATM function for communicating IP packets using an ATM connection.
The M terminal device uses ATM-NI as its own ATM address.
MAC (Media Access Card) of C (ATM Network Interface Card)
Control) address is the ESI (End System) of the ATM address for specifying the destination terminal (end system).
Identifier (terminal identifier).

For example, as an address format in an ATM network such as an ATM-LAN and a company / university, the ATM is
Forum standard 20 octet (byte) private ATM addresses are used, DCC ATM format, ICD ATM format, 164 ATM
There are three formats, of which 6 bytes are ESI
Is a terminal identifier of the end system determined to be unique within each routing area.
Address is used, and 1-byte SEL (Se
lecter) identifies a higher-level protocol / service on the terminal. The ATM-NIC is an interface card for transmitting and receiving cells to and from an ATM network, and includes a physical media dependent transmission / reception unit (PMD-TX, PMD-PM).
D-RX) and SAR (Segmentation And Reass)
A processing device for performing AAL-5 adaptation processing and the like is mounted.

[0004]

By the way, conventionally, AT
Devices connected to M network (ATM node)
When using a plurality of IP addresses assigned to the ATM-NIC,
AC addresses are statically associated with each other, and an ATM-NIC for an IP address to be used is mounted on the device.

As described above, since only one IP address is assigned to one ATM-NIC,
To support multiple IP addresses on one device,
It is necessary to mount a plurality of ATM-NICs on the device, which increases the size and cost of the device.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and has as its object the purpose of one ATM-N.
It is an object of the present invention to provide a device capable of performing ATM communication using a plurality of IP addresses with a smaller number of ICs or ATM-NICs than the assigned IP address.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an ATM terminal having an IP over ATM function for performing IP packet communication using an ATM connection. ESI
The unit uses the IP address assigned to the own terminal device instead of the MAC address of the ATM network interface card mounted on the own terminal device,
The required number of network interface cards is smaller than the number of a plurality of IP addresses assigned to the own terminal device, and the IP address for the ATM network assigned to the own station device is changed to an AT used by the own station device.
There are provided means for creating the own station ATM address by setting the ATM address of the own station of the M network in the ESI section, and means for registering the created own station ATM address in a server device of the ATM network to be connected.

[0008]

Embodiments of the present invention will be described. In the preferred embodiment, the ATM terminal device of the present invention is provided with a plurality of IP addresses assigned to the own station device and a plurality of IP addresses corresponding to the IP over ATM function of performing IP packet communication using an ATM connection. It manages the ATM addresses of the ATM server devices existing in the ATM network, creates a group of ATM addresses for the ATM network corresponding to the plurality of IP addresses, and registers them in the ATM server devices of the corresponding ATM network. Means to do (21)
And analyze the transmission data passed from the upper protocol,
Means (22) for determining the ATM network to be connected, acquiring the ATM address of the own station corresponding to the ATM network, and adding the ATM address to the transmission data, and data for requesting the establishment of an ATM connection from an ATM terminal device existing in a certain ATM network. Means for analyzing a predetermined header in the received data, determining an ATM network in which the terminal exists, and controlling to establish an ATM connection with the terminal. Be composed.

In a preferred embodiment of the present invention, the ATM network IP address assigned to the own station device is set in the ESI portion of the own station ATM address of the ATM network used by the own station device. Create the own station ATM address.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of one embodiment of the present invention. Referring to FIG. 1, an apparatus according to an embodiment of the present invention includes an upper protocol 10 such as TCP / IP and an IP over A
The IP over ATM function 20, which includes a TM function 20, an ATM-NIC 40, and a device driver 30 for controlling the NIC 40, and performs IP packet communication using an ATM connection set between apparatuses by an ATM address. It is provided with its own station ATM address registration means 21, transmission data processing means 22, and ATM connection establishment request reception processing means 23.

The plural self-station ATM address registration means 21 comprises:
A plurality of IP addresses assigned to the device 100 and the ATM addresses of the ATM server devices existing in the ATM network corresponding to the plurality of IP addresses are managed in an address table or the like. And create them as AT
Register with the ATM server device of the M network.

When the apparatus 100 performs transmission processing, the transmission data processing means 22 transmits a higher-level protocol (eg, TCP / IP) 1
The transmission data passed from 0 is analyzed, an ATM network to be connected is determined, and the own-station ATM address corresponding to the ATM network is obtained from the plural-station ATM address registration means 21 and added to the transmission data.

When the apparatus 100 receives data requesting the establishment of an ATM connection from a terminal in a certain ATM network, the ATM connection establishment request reception processing means 23 receives an LLC (Logical Lin) in the received data.
k Control) Analyzes the header, determines the ATM network in which the requesting terminal exists, and establishes an ATM connection with the requesting terminal. Note that this LLC header is I
In a method for transmitting a P packet by ATM, an IEEE 802.2 LLC header and an IEEE 802.1
a LLC / multiplexed in combination with SNAP header
This is based on the SNAP capsule method, and uses PVC (Perm
Anent Virtual Connection) is used by default.

Next, the operation of one embodiment of the present invention will be described.

First, registration of the own station ATM address will be described. In order to register the own-station ATM address, the plural-self-station ATM address registration means 21 performs the following processing.

The apparatus 100 creates its own ATM address. FIG. 2 is a diagram for explaining creation of the own station ATM address in one embodiment of the present invention. Regarding the IP address assigned to the device, the one set in the ESI portion of the ATM address of the ATM server device existing in the corresponding ATM network is defined as the own station ATM address, and this is the number of IP addresses assigned to the device. create.

Since the IP address (IPv4) is 4 bytes and the ESI area is 6 bytes, there is a blank area of 2 bytes, and 0 is set in the blank area of 2 bytes. Keep it. As shown in FIG.
The 1st to 5th bytes of the part are the IP address.

A self-station ATM address is registered in the ATM server device via the ATM network. FIG.
FIG. 4 is a diagram schematically showing a state in which 00 registers its own ATM address in each ATM server device. As shown in FIG.
The created self-station ATM address (group) is registered in an ATM server device existing in each corresponding ATM network.

Next, processing for transmitting data from the apparatus 100 will be described. FIG. 4 is a diagram schematically showing a state of the transmission processing in one embodiment of the present invention.

Processing during transmission, transmission data processing means 22
Determines the ATM network to send. That is, the transmission data processing means 22 is provided with a higher-level protocol (TCP / IP)
When the transmission data is received from 10, the ATM network to be transmitted is determined from the transmission IP address in the IP header included in the transmission data.

Next, the transmission data processing means 22 obtains the own-station ATM address corresponding to the determined ATM network from the plurality of own-station ATM address registration means 21.

The transmission data processing means 22 adds its own ATM address to the transmission data. The local station ATM address acquired from the plural local station ATM address registration means 21 is set in the source ATM address area in the LLC header added to the transmission data, sent to the device driver 30 that controls the NIC, and transmitted from the ATM-NIC 40. I do. The transmission data is transmitted to the destination ATM network via the ATM switch device.

Next, a process of receiving an ATM connection establishment request from a terminal device of the ATM network will be described.

ATM connected to an ATM network
Upon receiving the ATM connection establishment request from the terminal device, the ATM connection establishment request receiving means 23
Determine the ATM network where the M terminal is located.

Next, the ATM connection establishment request receiving means 23 establishes an ATM connection, that is, establishes an ATM connection with the requesting terminal.

AT connected to ATM network
Conventionally, when the M terminal device uses a plurality of IP addresses,
Although the same number of ATM-NICs as the number of IP addresses had to be implemented, according to the present embodiment, a plurality of IP addresses can be used with a smaller number of ATM-NICs than the number of IP addresses. Can be connected to the ATM network, and the number of ATM-NICs can be reduced, so that the cost can be reduced.

[0027]

As described above, according to the present invention,
In an ATM terminal device connected to an ATM network and using a plurality of IP addresses, an AT used by its own device
IP in ESI part of own station ATM address of M network
By using addresses, a plurality of IP addresses can be used by a smaller number of ATM-NICs than the number of IP addresses, and the device can be connected to a larger number of ATM networks, and the number of ATM-NICs can be reduced. By reducing the size, it is possible to reduce the cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a local station ATM address in one embodiment of the present invention.

FIG. 3 is a diagram for explaining a process of registering a local ATM address in one embodiment of the present invention;

FIG. 4 is a diagram for explaining a transmission process in one embodiment of the present invention.

FIG. 5 is a diagram for explaining an ATM connection establishment request accepting process in one embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 10 upper layer protocol 20 IP over ATM function 21 plural self-station ATM address registration means 22 transmission data processing means 23 ATM connection establishment request receiving means 30 NIC control device driver 40 ATM-NIC 100 device (ATM terminal device) 101 _{1 to} 101 ₃ ATM network

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/28 H04L 12/46

Claims (5)

(57) [Claims] In a network system including an ATM terminal having an IP over ATM function for performing IP packet communication using an ATM connection, an ESI (Ensured Encoding) of an ATM address of a local station of the ATM terminal is provided.
d System Identifier;
The IP (Internet Protocol) address assigned to the ATM terminal device is used in place of the MAC (Media Access Control) address of the ATM network interface card mounted on the M terminal device, and the required ATM network interface card is used. A network system, wherein the number is smaller than the number of a plurality of IP addresses assigned to the ATM terminal device. 2. An ATM terminal device having an IP over ATM function for performing IP packet communication using an ATM connection, comprising: an IP terminal for an ATM network assigned to its own station device;
The ESI (End System Identifier) of the own station ATM address of the ATM network to which the own station device is connected
ifier; terminal identifier) unit, and means for registering the created own-station ATM address in an ATM server device on the ATM network to be connected. An ATM terminal device. 3. An ATM terminal device comprising: an ATM network interface card; an ATM network interface card control means; an IP over ATM function for performing IP packet communication using an ATM connection; In the IP over ATM function, the IP address for the ATM network assigned to the own station device is used as the E of the own station ATM address of the ATM network used by the own station device.
Means for creating an own-station ATM address by setting in the SI section, and registering the created own-station ATM address in a server device of an ATM network to be connected, wherein the IP address of the ESI section in the own-station ATM address is provided. Wherein the required number of the ATM network interface cards is made smaller than the number of a plurality of IP addresses assigned to the own station device. 4. An ATM provided with an IP over ATM function for communicating an IP packet using an ATM connection.
The terminal device manages a plurality of IP addresses assigned to the own station device and ATM addresses of ATM servers corresponding to the plurality of ATM addresses, and manages a plurality of ATM addresses corresponding to the plurality of IP addresses. First, a group of station ATM addresses is created and registered in an ATM server device of the corresponding ATM network.
A second means for analyzing transmission data passed from a higher-order protocol, determining an ATM network to be connected, obtaining an ATM address of the own station corresponding to the ATM network, and adding the ATM address to the transmission data; When data requesting the establishment of an ATM connection is received from an ATM terminal device existing in the network, a header in the received data is analyzed, an ATM network in which the terminal device exists is determined, and an ATM connection with the terminal device is established. An ATM terminal device, comprising: third means for performing control to perform establishment. 5. The first means stores an ATM network IP address assigned to the own station device into an ATM address of the own station ATM address of the ATM network used by the own station device.
4. The ATM terminal device according to claim 3, wherein an ATM address of the own station is created by setting the ATM address in the SI unit.