JP2817727B2 - Redundant control method of address resolution device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex system, and more particularly to a duplex system for a local area network device using an ATM (Asynchronous Transfer Mode) system.

[0002]

2. Description of the Related Art FIG. 4 shows an example of this type of conventional duplex system. Referring to FIG. 4, in the conventional dual system of the local network device of the ATM system, the first and second clients 15 and 16, the ATM switch 14, the duplexer 13, and between the ATM address and the network address (IP address). The first and second address resolution devices 11 and 12 for performing the address resolution are provided.

As shown in FIG. 4, in the conventional system, the first and second address resolution devices 11,
A duplex device 13 is provided so that the first or second client 15 or 16 can connect to the ARP server 12 (ARP server) with the same address. The first
The address resolution device 11 is an ACT system (active system), and the second address resolution device 12 is an STB system (standby system).

[0004]

However, the above-mentioned conventional system has the following problems.

(1) The first problem is that, in the above-mentioned conventional method, in order for the clients 5 and 6 to access the duplicated address resolution devices 11 and 12 with the same address, addresses having different addresses are used. Solution device 1
This means that it is necessary to newly provide a duplexing device 13 for selecting 1, 12.

(2) The second problem is that since the duplexer 13 is connected to the ATM switch 14 by one physical medium, if there is a failure in this connection path, the address resolution device is duplicated. However, the client may not be able to connect to the network and the availability may be reduced.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-described problems, and has as its object to provide a dual control system for realizing the duplex of the address resolution device without newly providing a duplicate connection device. It is to provide a method.

[0008]

In order to achieve the above object, a duplex control system according to the present invention is connected to an ATM switch and performs first and second address resolution for performing an address resolution between an ATM address and a network address. Device, and a plurality of clients that make an address resolution request to the address resolution device, comprising: the address resolution device and the client respectively assigned a unique address, the address resolution device, the client Are connected by an ATM switch that is dynamically or statically connected by a virtual circuit (VC) using the address, and a representative address is assigned to the ATM switch by the ATM switch. The address of the second address resolution device is associated, and the client represents the ATM switch. If there is a connection request by dress, the first 1, ACT among the second address resolution device
It is characterized in that a connection is made to a system specified as a system.

According to the present invention, the ATM switch holds the addresses of the ACT address resolution device and the STB address resolution device in an address table, and when a connection request is received from a client at one representative address,
An address of the ACT address resolution device is obtained from the representative address, and a connection request is made based on the address.

Further, in the present invention, an inter-system communication VC is set between the first and second address resolution devices, and A
The CT-based address resolution device transfers the address resolution information to the STB-based address resolution device using the inter-system communication VC, and synchronizes the address resolution table between the first and second address resolution devices. It is characterized by taking.

In the present invention, when the ATM switch detects a failure of the ACT address resolution device, a virtual channel to the ACT address resolution device is sent to the STB address resolution device, and the ATM switch is Thereafter, when there is a connection request using the representative address, control is performed so as to connect to the STB type address resolution device.

[0012]

Embodiments of the present invention will be described below. In the preferred embodiment of the present invention, two address resolution devices are provided (first and second address resolution devices shown in FIG. 1).
In order to synchronize the address resolution tables between the two address resolution devices, one of them is an ACT system and the other is an STB system. ) Is set.

An ACT address resolution device (FIG. 1)
Then, the address of the first address resolution device 1) and the address of the STB system address resolution device (the second address resolution device 2 in FIG. 1) are held in the address resolution device address table of the ATM switch (6 in FIG. 1). 3), when there is a connection request from a client at one representative address, there is provided a means for obtaining the address of the ACT address resolution device from this representative address and making a connection request using this address.

The operation principle of the embodiment of the present invention will be described below.

Referring to FIG. 1, the address table of ATM switch 6 (see FIG. 3) stores the first address
2 are registered, and one of them is designated as an ACT system (ACT system server address).

The first or second client 3, 4 sends a connection request to the address resolution device using the representative address,
Sends it to ATM switch 6.

The ATM switch connects from the input representative address (B1 in FIG. 3) to the ACT address resolution device according to the address table (see FIG. 2).

The client registers address resolution information in an ACT address resolution device (first address resolution device 1 in FIG. 1).

An ACT address resolution device (first address resolution device 1 in FIG. 1) uses an inter-system communication VC 5 to convert address resolution information to an STB type address resolution device (second address resolution device in FIG. 1). Transfer to device 2).

When the ATM switch 6 detects a failure in the ACT address resolution device, it switches the VC to the ACT address resolution device to the STB address resolution device.
The ATM switch 6 functions to connect to the STB-based address resolution device using the address table (see FIG. 3) when a connection request using the representative address is issued thereafter.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;

FIG. 2 is a diagram for explaining an embodiment of the present invention. This is the ATM specified in RFC1577
ARP (Address Resolution Protocol) function is duplicated.

In FIG. 2, reference numerals 1 and 2 denote first and second ATs.
M-ARP server, 3, 4 are ATM-ARP clients, 5 is VC (virtual channel) for inter-system communication, 6 is ATM
Switch.

Referring to FIG. 3, addresses of the first and second ATM-ARP servers 1 and 2 are registered in an address table of ATM switch 6, and one of them is designated as an ACT system.

The first and second ATM-ARP clients 1 and 2 send a connection request to the ATM-ARP server to the ATM switch 6 using the representative address.

The ATM switch 6 connects to an ACT-based ATM-ARP server according to an address table.

The ATM-ARP clients 3 and 4
It registers its own ATM address and IP address in a CT-based ATM-ARP server.

The ACT type ATM-ARP server transfers the ATM ARP information to the STB type address ARP server using the inter-system communication VC5.

The ATM switch 6 is an ACT type ATM-A
If a failure of the RP server is detected, an ACT AT
The VC (virtual channel) to the M-ARP server is switched to the ARP server of the STB system.

Thereafter, the ATM switch 6 uses the address table (see FIG. 3) when a connection request using the representative address is received from the client side, for example.
Connect to the STB ATM-ARP server.

[0031]

As described above, according to the present invention,
The following effects are obtained.

(1) A first effect of the present invention is that, when the address resolution devices are duplicated, it is not necessary to prepare a duplicate device for selecting an address resolution device having a different address.

The reason for this is that, in the present invention, an address table is provided in the ATM switch, and connection to the address resolution device is made by a representative address.

(2) A second effect of the present invention is that the availability of the address resolution device is improved.

The reason is that, in the present invention, two address resolution devices are connected to the ATM switch by independent physical media.

[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 showing a configuration of one embodiment of the present invention.

FIG. 3 is a diagram showing a representative address table provided in an ATM switch in one embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional duplex system.

[Description of Signs] 1, 2 Address Resolution Device 3, 4 Client 5 VC 6 ATM Switch for Intersystem Communication

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H04L 12/28 H04L 12/46

Claims (5)

(57) [Claims] A client device requests a connection to an address resolution device by sending a representative address of a duplicated address resolution device for performing address resolution between an ATM address and a network address to an ATM switch. The ATM switch further includes means for retrieving the address of an ACT-based address resolution device from the representative address among the duplicated address resolution devices, and receives the representative address from the client to resolve the ACT-based address resolution. A duplex control method, wherein the system is connected to an address resolution device designated as a device. 2. A first system which is connected to an ATM switch and performs address resolution between an ATM address and a network address.
A second address resolution device, and a plurality of clients for making an address resolution request to the address resolution device, wherein the address resolution device and the client each have a unique address, and the address A solution device and the client are connected by an ATM switch that connects dynamically or statically by a virtual circuit (VC) using the address, and a representative address is given by the ATM switch;
The addresses of the first and second address resolution devices are associated with the representative address, and when the client issues a connection request to the ATM switch using the representative address, the first and second address resolution devices are used. Wherein a connection is made to one designated as an ACT system. 3. The ATM switch holds the addresses of an ACT-based address resolution device and an STB-based address resolution device in an address table, and when a connection request is received from a client at one representative address, the ACT address is determined from the representative address. 2. The duplex control system according to claim 1, further comprising means for obtaining an address of the system address resolution device and making a connection request based on the address. 4. An inter-system communication virtual channel (VC) is set between the first and second address resolution devices, and the ACT system address resolution device is connected to the inter-system communication virtual channel (V).
2. The method according to claim 1, wherein the address resolution information is transferred to the address resolution device of the STB system using C), and the address resolution table between the first and second address resolution devices is synchronized. Redundant control method described. 5. When the ATM switch detects a failure in the ACT address resolution device, it switches a virtual channel (VC) to the ACT address resolution device to the STB address resolution device side, and 3. The dual control system according to claim 2, wherein when a connection request using a representative address is made thereafter, control is performed so as to connect to the STB type address resolution device.