JPH09107359A - Atm switch and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the ATM switch and the control method in which a data packet is transferred from an ATM equipment of the SVC system to an ATM equipment of the PVC system. SOLUTION: An address extract section 11 extracts an IP address of an ATM equipment 1 being a sender from a data packet sent from an ATM equipment 1 of the PVC system and the address is registered in an address information management table 13 with a logic channel number of the ATM equipment 1. The address information management table 13 is referenced in response to a logic channel number inquiry by an IP address from the ATM equipment 3 of the SVC1 system or data packet transmission by the transmission destination IP address designation from the ATM equipment 4 of the SVC2 system to acquire a logic channel number corresponding to the IP addresses.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an ATM switch and a control method, and more particularly to an ATM switch and a control method for transmitting data from an SVC type ATM device to a PVC type ATM device.

[0002]

2. Description of the Related Art In B-ISDN (broadband ISDN) and the like constructed based on ATM (Asynchronous Transfer Mode) technology, a user can build a unique network.
C (Virtual Channel) service is provided. To this end, a PVC (Permanent Virtual Chan- nel) in which the ground of a VC connecting ATM devices is fixedly determined.
nel) method and SVC (Switched
Virtual Channel) method.

In the PVC system, the correspondence between ATM devices and logical channel numbers (VCI and VPI) is fixed, the logical channel numbers of all destination ATM devices are registered in each ATM device, and the The ATM device specifies a logical channel corresponding to the destination ATM device and transmits fixed-length packet data called an ATM cell. The ATM switch has a logical channel number specified at the time of input. The packet data is transmitted to the logical channel.

The SVC system includes the SVC1 system and the SVC system.
There is the VC2 system. In the SVC1 system, only the IP address for identifying each destination ATM device on the network is registered in each ATM device, and the IP address of the destination ATM device is transmitted from the source ATM device. Receiving the logical channel number of the destination ATM device from the ATM switch, and transmitting the packet data by designating the logical channel number. In the SVC2 system, the source ATM device transmits the packet data of the destination ATM device. The packet data is transmitted by designating the IP address, and the ATM switch transmits the packet data to the logical channel of the logical channel number corresponding to the IP address.

The ATM switch manages correspondence information between an IP address registered when each ATM device is connected and a logical channel number assigned to each ATM device in both the SVC1 system and the SVC2 system. In the SVC1 system, the logical channel number corresponding to the destination IP address is notified in response to the inquiry about the logical channel number. In the SVC2 system, the logical channel number corresponding to the destination IP address of the input packet data is indicated. Acquisition and transfer of packet data to the corresponding logical channel.

[0006]

Therefore, in such a conventional ATM switch, when a data packet is transmitted from a PVC type ATM device, a destination logical channel which is directly designated without recognizing an IP address is used. ATM for transferring data packets based on number
The switch does not know the correspondence information between the IP address and the logical channel number regarding the ATM device of the PVC system,
PV from SVC1 or SVC2 ATM
When transmitting packet data to a C-system ATM device, there is a problem that the logical channel number of the destination ATM device cannot be obtained, and the packet data cannot be transmitted. An object of the present invention is to solve such a problem, and an object of the present invention is to provide an ATM switch which can transfer packet data from an SVC type ATM device to a PVC type ATM device.

[0007]

In order to achieve such an object, an ATM switch and a control method according to the present invention include an address information management table for storing correspondence information between the IP address of each ATM device and a logical channel number. And the data packet sent from any ATM device to IP
An address extractor for extracting an address, the correspondence information between the IP address of the source ATM device extracted by the address extractor and the logical channel number of the source ATM device is registered in the address information management table, and the destination is also registered. And an address management unit that acquires a logical channel number for the IP address indicating the destination from the address information management table as a logical channel number indicating the destination.
When packet data is transmitted from the ATM device of the system, the address extracting unit extracts the IP address of the source ATM device from the packet data, and manages this IP address and the logical channel number of the source ATM device. The logical channel number corresponding to the destination IP address is acquired from the address information management table according to the transmission of the packet data in which the destination IP address is designated from the ATM device registered in the table, and the logical channel number is acquired. Packet data is transferred as a destination, and the logical channel number corresponding to the destination IP address is acquired from the address information management table in response to an inquiry from the arbitrary ATM device about the logical channel number corresponding to the destination IP address, ATM with this logical channel number as the destination
The device is notified.

Therefore, when packet data is transmitted from a PVC-based ATM device, the IP address of the source ATM device is extracted from the packet data by the address extraction unit, and this IP address and the logical channel of the source ATM device are extracted. The number is registered in the address information management table. In response to transmission of packet data specifying a destination IP address from an arbitrary ATM device, a logical channel number corresponding to the destination IP address is acquired from the address information management table, and packet data is transmitted with this logical channel number as the destination. Is transferred. Also, any A
In response to the inquiry about the logical channel number corresponding to the destination IP address from the TM device, the logical channel number corresponding to the destination IP address is acquired from the address information management table, and the ATM is used with this logical channel number as the destination.
The device is notified.

[0009]

Next, the present invention will be described with reference to the drawings. FIG. 1 shows an AT according to an embodiment of the present invention.
FIG. 3 is a block diagram of an M switch, where 1 is an I switch;
A PVC type ATM device having "IP1" as a P address and "# 1" as a logical channel number, and a PVC type ATM having "IP2" as an IP address and "# 2" as a logical channel number. The device 3 is an SVC1 ATM device having "IP3" as an IP address, and the SVC2 ATM device having "IP4" as an IP address.

Reference numeral 10 denotes each of the ATs 1 to 4
An ATM switch for exchanging and connecting packet data exchanged between M devices. In the ATM switch 10, an address extraction unit 11 extracts an IP address from packet data transmitted from an arbitrary ATM device.
Stores the correspondence information between the IP address of the source ATM device extracted by the address extraction unit 11 and the logical channel numbers (VPI and VCI) physically allocated to the source ATM device in the address information management table 13 Address management unit.

Further, when packet data is received from an arbitrary ATM device, a check 14 checks whether or not the transmission destination logical channel number is designated, and if not, searches the address information management table 13. The data transmission management unit acquires the logical channel number corresponding to the destination IP address and transfers the packet data to the logical channel indicated by the destination logical channel number.

FIG. 2 is a block diagram showing an ATM cell.
Reference numeral 1 denotes a header section in which information necessary for call control of packet data (ATM cells) is stored, and reference numeral 25 denotes a payload section which can be arbitrarily used by a user. In the header section 21,
22 is a VPI (logical path identifier / 8 bits) for identifying a logical path, and 23 is a VC for identifying a logical line.
I (logical channel identifier / 16 bits), and these VPI and VCI constitute a logical channel number.

FIG. 3 is a block diagram showing an IP packet defined by the TCP / IP protocol.
IP storing information required for call control of P packets
The header section 32 is an IP data section that can be used arbitrarily by the user. In the IP header section 31, reference numeral 32 denotes an IP address indicating the source of the IP packet, and reference numeral 33 denotes an IP address indicating the destination of the IP packet.

Actually, an IP packet in which information to be transmitted is stored in an IP data section 35 is generated by a source ATM device, and this IP packet is divided into packet data (ATM cell) payload sections 25, respectively. It is stored and transmitted to the ATM switch 10. The information stored in the payload section 25 of the packet data received from the ATM switch 10 is combined in a predetermined order to generate an original IP packet, and the information stored in the IP data section 35 thereof. Is obtained.

Referring to FIG. 4, as an operation of the present invention, the ATM device 3 of the SVC1 system transmits the AT device of the PVC system.
An operation when transmitting packet data to the M device 1 will be described. FIG. 4 is a sequence diagram showing the operation of the ATM switch. In particular, FIG.
4 shows a sequence when transmitting packet data to a VC-based ATM device.

It is assumed that the other party's logical channel number is registered in advance in the PVC ATM devices 1 and 2. In this case, the ATM device 1
“# 2” is registered as the logical channel number of the device 2,
"# 1" is registered in the ATM device 2 as the logical channel number of the ATM device 1. Also, SVC1, SVC
The two-system ATM devices 3 and 4 have the I
It is assumed that the P address is registered as “IP1”.

First, the ATM device 3 of the SVC1 system
For the TM switch 10, its own IP address "IP
A predetermined self IP address registration request storing "3" is transmitted (step 51). ATM switch 1
0 from the received registration request.
The IP address of the M device 3 is extracted, and the extracted IP address “IP3” and the logical channel number “#” of the ATM device 3 are extracted.
The information corresponding to "3" is registered by the address management unit 12 in the address information management table 13 as shown in FIG.

In this case, an IP packet is divided into lower-layer data link layer packets, here, ATM layer packet data and input to the ATM switch 10. Therefore, the address extracting unit 11 extracts the original IP from each packet data based on the TCP / IP protocol.
A packet is generated and the source ATM is determined from the IP header.
The IP address of the device, here the IP address of the ATM device 3, is extracted.

The logical channel number is, as shown in FIG. 2, the V stored in the header 21 of the packet data.
It is composed of a PI 22 and a VCI 23, and is registered together with the corresponding IP address. After registration is complete, A
The TM switch 10 notifies the ATM device 3 of the completion of the registration (step 52). Thus, the SV
An explicit IP address is registered in the ATM switch 10 from the C1 type ATM device.

On the other hand, before and after this, the AT of the PVC system
When the packet data is transmitted from the M device 1 to the ATM device 2 of the PVC system by designating the destination logical channel (step 53), the address extraction unit 11 is similarly operated.
Extracts the IP address of the ATM device 1 and
The address “IP1” and the logical channel number “# 1” are stored in the address information management table 13 by the address management unit 12.
Registered in. Subsequently, the data transmission management unit 14
The packet data from the ATM device 1 is transferred to the logical channel "# 2" which is the designated destination.

In this way, the explicit IP address registration processing from the SVC type ATM device and the PVC
Automatic registration of IP addresses in response to packet data transmission by the ATM system
The correspondence information between the IP address of the device and the logical channel number is stored in the address information management table 1 of the ATM switch 10.
3 will be registered. Therefore, after these registrations are completed, the ATM switch 10 can notify the desired logical channel number in response to the inquiry of the logical channel number of the destination ATM device from the SVC1 type ATM device 3, that is, the acquisition request. It becomes possible.

That is, PVC is used as a destination ATM device.
A logical channel number acquisition request from the ATM device 3 specifying the IP address “IP1” of the
When transmitted from the TM device 3 (step 54), the AT
The logical channel number “# 1” corresponding to the IP address “IP1” by the address management unit 12 of the M switch 10
(VPI1 and VCI1) is retrieved from the address information management table 13 and notified to the requesting ATM device 3 (step 55).

In response, the ATM device 1 sends the destination A
Transmission of the packet data designating the logical channel number “# 1” indicating the TM device 1 is started (step 56).
The data transmission management unit 14 of the TM switch 10
The packet data from the M device 1 is transferred to the designated logical channel number “# 1”, and the ATM device 1 of the PVC system to which the logical channel number “# 1” is assigned is the ATM device of the SVC1 system. 3 is received (step 57).

Next, referring to FIG. 6, A of the SVC2 system will be described.
The operation when packet data is transmitted from the TM device 4 to the PVC-based ATM device 1 will be described. FIG. 6 is a sequence diagram showing the operation of the ATM switch. In particular, FIG.
4 shows a sequence for transmitting packet data to a TM device.

As described above, first, the ATM of the PVC system is used.
When packet data is transmitted from the device 1 to the PVC-based ATM device 2 by designating a destination logical channel (step 61), the IP address of the ATM device 1 is extracted by the address extraction unit 11, and the IP address "I
P1 ”and the logical channel number“ # 1 ”are registered in the address information management table 13 by the address management unit 12. Subsequently, the data transmission management unit 14 transfers the packet data from the ATM device 1 to the logical channel “# 2” which is the designated transmission destination.

As described above, the correspondence information between the IP address of each ATM device and the logical channel number is stored in the ATM switch 10 by the automatic IP address registration process according to the packet data transmission by the PVC ATM device. It is registered in the address information management table 13. Therefore, after these registrations are completed, S
I of the destination ATM device from the VC2 ATM device 4
According to the packet data transmission specifying the P address, A
The packet data can be transferred to the logical channel number corresponding to the destination ATM device by the TM switch 10.

That is, as the transmission destination, the AT of the PVC system is used.
AT of SVC2 system specifying the IP address of M device 1
In response to the transmission of the packet data from the M device 4 (step 62), the IP address "IP1" of the destination ATM device 1 is extracted by the address extraction unit 11 of the ATM switch 10, and based on the IP address "IP1". The address management table 13 is searched by the address management unit 12 and the corresponding logical channel number “# 1” (VPI
1 and VCI1) are extracted.

Therefore, the packet data transmitted from the ATM device 4 is transferred to the logical channel number "# 1" corresponding to the specified IP address "IP1" by the data transmission management unit 14 of the ATM switch 10. The PVC-based ATM device 1 to which the logical channel number "# 1" is assigned receives packet data from the SVC2-based ATM device 4 (step 63).

As described above, the address extracting unit 11
The IP address of the source ATM device 1 is extracted from the data packet transmitted from the VC ATM device 1, and the IP address and the logical channel number of the source ATM device 1 are registered in the address information management table 13. Therefore, the correspondence information between the IP address and the logical channel number of the source ATM device is automatically registered in the address information management table 13 in response to the packet data transmission from the PVC ATM device. Becomes

Therefore, in response to a logical channel number inquiry from the SVC1 ATM device, the logical channel number corresponding to the PVC ATM device indicated by the IP address is notified by referring to the address information management table 13. be able to. In addition, the address information management table 13 is sent in response to the data packet transmission from the ATM device of the SVC2 system designating the destination IP address.
, Packet data can be transferred to a logical channel of a logical channel number corresponding to the ATM device of the PVC system.

[0031]

As described above, according to the present invention, an address extraction unit for extracting the IP address of the source ATM device from a data packet transmitted from an arbitrary ATM device, and the address extraction unit for extracting the IP address. An address management unit that registers correspondence information between the IP address and the logical channel number of the source ATM device in the address information management table is provided, and packet data specifying a destination IP address from any ATM device is transmitted. According to the above, the logical channel number corresponding to the destination IP address is acquired from the address information management table, the packet data is transferred with this logical channel number as the destination, and the destination IP address is transmitted from any ATM device. Responsive IP address from the address information management table in response to the inquiry about the logical channel number Retrieve the corresponding logical channel number, in which to notify the logical channel number to the ATM device as a destination.

Therefore, when a data packet is transmitted from a PVC ATM device, the address extracting unit automatically extracts the correspondence information between the IP address of the source ATM device and the logical channel number, and Since the information is registered in the management table, it is not necessary to previously register the correspondence information between the IP address and the logical channel number for all the PVC type ATM devices to be accommodated, and the logical channel numbers of the PVC type ATM devices cannot be known. Even if the SVC ATM device is PVC
It becomes possible to transmit packet data to the ATM device of the system.

[Brief description of the drawings]

FIG. 1 is a block diagram of an ATM switch according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a cell.

FIG. 3 is an explanatory diagram showing a configuration of an IP data packet.

FIG. 4 is a sequence diagram showing an operation of the ATM switch.

FIG. 5 is an explanatory diagram showing an address information management table.

FIG. 6 is a sequence diagram showing another operation of the ATM switch.

[Explanation of symbols]

1, 2 ... ATM device (PVC system), 3 ... ATM device (SVC1 system), 4 ... ATM device (SVC2 system),
10 ATM switch, 11 Address extraction unit, 12
Address management unit, 13 ... address information management table, 1
4: Data transmission management unit

Claims (2)

[Claims] 1. An ATM for accommodating a PVC type ATM device and an SVC type ATM device, and transferring packet data transmitted from an arbitrary ATM device to a predetermined ATM device based on a logical channel number indicating a transmission destination. In the switch, the address information management table storing the correspondence information between the IP address of each ATM device and the logical channel number, and the data packet transmitted from any ATM device
An address extractor for extracting the P address, and correspondence information between the IP address of the source ATM device extracted by the address extractor and the logical channel number of the source ATM device are registered in the address information management table and transmitted. The logical channel number for the IP address indicating the destination is acquired from the address information management table as the logical channel number indicating the transmission destination, and the IP address corresponding to the logical channel number inquiry corresponding to the predetermined IP address from any ATM device is transmitted. Obtain the logical channel number corresponding to the address from the address information management table,
An AT including an address management unit for notifying the ATM device of the logical channel number.
M switch. 2. An ATM for accommodating a PVC type ATM device and an SVC type ATM device, and transferring packet data transmitted from an arbitrary ATM device to a predetermined ATM device based on a logical channel number indicating a transmission destination. In the switch, the address information management table storing the correspondence information between the IP address of each ATM device and the logical channel number, and the data packet transmitted from any ATM device
An address extracting unit for extracting a P address, and an address managing unit for registering the correspondence information between the IP address of the source ATM device extracted by the address extracting unit and the logical channel number of the source ATM device in the address information management table. When packet data is transmitted from a PVC ATM device, the IP address of the source ATM device is extracted from the packet data by the address extraction unit.
The P address and the logical channel number of the source ATM device are registered in the address information management table, and the transmission is performed from the address information management table in response to the transmission of packet data specifying the destination IP address from any ATM device. The logical channel number corresponding to the destination IP address is acquired, the packet data is transferred with this logical channel number as the destination, and in response to the inquiry about the logical channel number corresponding to the destination IP address from any ATM device, A method for controlling an ATM switch, characterized in that a logical channel number corresponding to the destination IP address is acquired from an address information management table and the logical channel number is notified to the ATM device as a destination.