JPH1041949A - Virtual connection selecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select a specific virtual connection among a plurality of virtual connections by selecting the virtual connection in which a protocol header of a packet is in matching with a protocol header condition. SOLUTION: A virtual connection(VC) selection section 132 of an ATM adaptor control processor(ADP) 130 retrieves an address solution table to acquire a VC number in pairs with a communication destination address or a group of an ATM address and retrieves an extended address solution table 145. Then a protocol header condition in a table and a protocol header of a packet are compared and a definite VC number of ATM address in pairs with the matching protocol header condition is acquired and it is used for a destination address in an ATM network 150 and packet transmission is instructed to an ATM interface controller (ACTL) 120.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a host computer, a server, a terminal or a network relay device for performing routing and bridging, which is connected to a star type ATM (Asynchronous).
Transfer Mode) LAN (Local A
In particular, the present invention relates to a virtual connection selecting device for connecting a network (rear network) or a cell relay network, and in particular, a plurality of virtual connections (VC: Virtual) between the same destinations.
Bandwidth guarantee in an ATM network, such as setting a connection and assigning a VC according to the type of traffic, QoS (Quality of Se)
The present invention relates to a technology that is effective when applied to a virtual connection selection device that is effective for a network system that requires control.

[0002]

2. Description of the Related Art In recent years, when performing data communication by connecting a plurality of computers, an ATM network is formed by connecting a plurality of computers via an ATM switch or the like. High-speed data communication is being performed between computers.

In the ATM network, IP (I
As a conventional technique using a higher-level protocol such as Internet Protocol (RFC), RFC (Requests) is used.
tFor Comment) 1483 and RFC157
The method described in No. 7 is available.

[0004] RFC 1483 defines a system for multiplexing multi-protocol packets on an ATM network, and a VCM described in RFC 1483 is described.
In multiplexing, communication by a plurality of upper protocols is performed on an ATM network by assigning each higher protocol of the plurality of higher protocols to a specific VC.

[0005] RFC1577 stipulates the use of ATM as one logical IP subnet (LIS: Logical).
A method limited to IP subnetwork is defined, and a plurality of computers having IP addresses communicate on an ATM network by assigning each of the plurality of IP addresses to a specific VC.

[0006]

The present inventor has found the following problems as a result of studying the above prior art.

That is, in VC Multiplexing described in the RFC 1483, since the VC selection from the VC group connecting the same ground is performed according to the type of the upper protocol, the packet of the same upper protocol is divided into a plurality of different VCs. There is a problem that can not be sent.

[0008] The LIS described in RFC1577 has the following three problems.

First, the LIS described in RFC1577 is a method for IP only,
There is a problem that it cannot be used in a multi-protocol environment.

[0010] Second, in the LIS described in RFC1577, a packet of the same higher-level protocol can be transmitted to a plurality of different VCs only for IP, but a plurality of VCs are used between the same destinations. Since each VC must use a different IP address, a computer that communicates using a plurality of VCs between the same destinations needs the same number of IP addresses as the number of VCs to be used. There is a problem that it cannot be introduced to a system that is lacking.

Third, in the LIS described in RFC1577, when the IP address of the transmission destination is determined,
Since C is automatically selected, it cannot be applied to the dynamic routing environment, and if the routing table is set in advance in the configuration definition that defines the network configuration, the selectable VC is determined. Therefore, there is a problem that it is not possible to flexibly set a reference for VC selection.

Therefore, in the above-mentioned prior art, for example, the problems to be solved by the present invention are as follows.

(1) A plurality of VCs can be set between the same destinations without consuming a large number of addresses in an upper layer of the ATM layer, and different types of traffic are divided and communicated with the respective VCs.

(2) The criterion for selecting a VC is RFC 1483.
As described above, a VC can be selected not only according to the type of protocol in the upper layer of the ATM layer but also according to the type of application.

Further, as in the case where a routing table is set in the RFC1577 system, not only VCs can be divided according to IP destination addresses, but also the present invention can be applied to a multi-protocol environment, and VC selection conditions can be applied to source addresses, destination addresses, and sockets. To be able to set flexibly according to the protocol such as number.

An object of the present invention is to provide a technique capable of selecting a specific virtual connection from a plurality of virtual connections according to the contents of a protocol header of a packet of a multi-protocol data communication.

Another object of the present invention is to provide a technique capable of easily changing the condition for selecting a virtual connection by changing the configuration definition information set in a computer that performs communication.

Another object of the present invention is to provide a technique capable of using a plurality of virtual connections between a plurality of computers between the same locations.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0020]

SUMMARY OF THE INVENTION Among the inventions disclosed by the present application, the outline of a representative one will be briefly described.
It is as follows.

(1) In a virtual connection selection device for selecting a specific virtual connection from among a plurality of virtual connections set between a plurality of computers performing data transfer, protocol header conditions of a higher-level protocol performing data transfer and virtual connection An extended address resolution table creation unit for creating an extended address resolution table for associating a connection with a connection, and selecting a virtual connection in which a protocol header of a packet transmitted during data transfer matches a protocol header condition in the extended address resolution table And a virtual connection selection unit for performing the connection.

The extended address solution table creating section of the virtual connection selecting device creates an extended address solution table for associating a protocol header condition of an upper layer protocol for data transfer with a virtual connection.

Here, the protocol header condition includes a source address, a destination address, a socket number obtained by combining an address and a port number, and the like, a protocol header of a packet set according to an upper layer protocol or application software to be executed. Is set.

[0024] The extended address resolution table creation unit includes:
While setting information such as source address, destination address or socket number as protocol header conditions,
An extended address resolution table is created by associating a virtual connection for transferring a packet that matches the set protocol header condition.

For example, when moving image data is transferred by a moving image server using a virtual connection with a high transmission speed, or when character data is input using a virtual connection with a low transmission speed by interactive processing in a terminal device. Selects a virtual connection as follows.

First, the extended address resolution table creation section includes an entry in which a protocol header condition in which an address of a moving picture server is set and a virtual connection having a high transmission speed are associated, a protocol header condition in which an address of a terminal device is set, and An extended address resolution table having an entry associated with a virtual connection having a low transmission speed is created.

Next, the virtual connection selection unit compares the protocol header of the packet transmitted at the time of data transfer with a plurality of protocol header conditions in the extended address resolution table.

The address indicated by the protocol header is
When the address of the moving image server matches the set protocol header condition, a virtual connection with a high transmission speed corresponding to the protocol header condition is selected to transfer the data of the packet.

If the address indicated by the protocol header matches the protocol header condition in which the address of the terminal device has been set, a virtual connection having a low transmission speed corresponding to the protocol header condition is selected, and the Perform data transfer.

The virtual connection selection device selects a virtual connection according to protocol header conditions such as a source address, a destination address, and a socket number. Therefore, the virtual connection is selected without giving an upper address for each virtual connection. It is possible to make a selection.

Also, the content of the protocol header of a packet created using a specific upper protocol is different from the content of the protocol header of a packet created using another upper protocol. It is possible to select a virtual connection for a multi-protocol according to the header condition.

As described above, according to the virtual connection selecting device, a virtual connection whose protocol header matches the protocol header condition is selected, so that the virtual connection is selected according to the contents of the protocol header of the multi-protocol data communication packet. It is possible to select a specific virtual connection from a plurality of virtual connections.

(2) In the virtual connection selection device described in (1), the virtual connection selection device further comprises storage means for storing configuration definition information set in a computer that performs communication, and the extended address resolution table creating section includes: A protocol header condition is created with reference to the configuration definition information stored in the means.

In the virtual connection selection device, first, the configuration definition information set in the computer that performs communication is loaded, and the loaded configuration definition information is stored in the storage unit.

Next, the extended address solution table creating means creates an extended address solution table by referring to the configuration definition information stored in the storage means.

In the case of performing data communication by connecting a plurality of computers to a network, the address and name of the computer connected to the network, the type of higher-level protocol, and when the specific application software is executed, the specific application software Configuration definition information that defines a port number and the like to be used is set in advance.

In the virtual connection setting device, after loading the preset configuration definition information into the storage unit, the virtual connection setting device refers to the loaded configuration definition information and sets the protocol header condition.

When data transfer is performed using a different upper-level protocol, configuration definition information of a different upper-level protocol is loaded into the storage unit, and the extended address resolution table creating unit refers to the loaded configuration definition information and refers to the protocol. By resetting the header condition, it is possible to select a virtual connection using a different upper-level protocol.

As described above, according to the virtual connection selecting device, the protocol header condition is created with reference to the configuration definition information set in the computer, so that the configuration definition information set in the communicating computer is changed. By doing so, it is possible to easily change the selection condition of the virtual connection.

(3) In the virtual connection selection device according to (1) or (2), the extended address resolution table creating unit sets different protocol header conditions for a plurality of virtual connections set between the same destinations. Is what you do.

The extended address solution table creating section of the virtual connection selecting device, when creating an extended address solution table for associating a protocol header condition of an upper layer protocol for data transfer with a virtual connection,
Different protocol header conditions are set for a plurality of virtual connections between two computers between the same pair of locations.

Next, the virtual connection selection unit compares the protocol header of the packet sent at the time of data transfer with the protocol header condition in the extended address resolution table, and specifies a plurality of virtual connections between the same destinations. And perform data transfer.

For example, when a plurality of virtual connections are associated with a specific device and it is desired to use different virtual connections depending on the application software to be executed, a socket number used by the specific application software is set as a protocol header condition. Keep it.

Next, when the virtual connection selection unit compares the protocol header of the packet transmitted at the time of data transfer with the protocol header condition in the extended address resolution table, the protocol header condition is determined by the application software to be executed. Since they are different, a virtual connection is selected depending on the type of application software performing the data transfer.

As described above, according to the virtual connection selection device, different protocol header conditions are specified for each of a plurality of virtual connections set between the same destinations.
It is possible to use a plurality of virtual connections between a plurality of computers between the same one place.

[0046]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A virtual connection selection device according to an embodiment for selecting a virtual connection of an ATM network in a virtual connection selection device according to the present invention will be described below.

FIG. 1 is a diagram showing a schematic configuration of the virtual connection selection device of the present embodiment. In FIG. 1, 10
0 is an ATM connection adapter (hereinafter referred to as ATMA),
110 is a bus interface controller (hereinafter BCT)
L), 120 denotes an ATM interface controller (hereinafter referred to as ACTL), 130 denotes an ATM adapter control processor (hereinafter referred to as ADP), 13
1 is an extended address solution table creation unit, 132 is a VC selection unit, 140 is a shared memory, 141 is configuration definition information,
42 is a descriptor area, 143 is a data buffer area, 144 is a control table area, 145 is an extended address resolution table, 150 is an ATM network,
00 is a CPU, 210 is a CPU-ATM adapter connection bus.

As shown in FIG. 1, the virtual connection selection device of this embodiment comprises an ATMA 100, a BCTL 110
, ACTL 120, ADP 130, extended address resolution table creation unit 131, VC selection unit 132, shared memory 140, configuration definition information 141, descriptor area 142, data buffer area 143,
It has a control table area 144 and an extended address resolution table 145.

Also, as shown in FIG. 1, in the virtual connection selection device of the present embodiment, the ATMA 100 is built in or connected to a host computer, a server, a terminal or a network relay device having a routing and bridging function. It is connected via an ATM adapter connection bus 210 to the CPU 200 of the device.

The ATMA 100 is connected to the ATM network 150, and is connected to the ATM network 150.
It communicates with other host computers, servers, terminals, or network relay devices having routing and bridging functions connected to the server.

ATMA100 has BCTL110, AC
It is composed of a TL 120, an ADP 130 and a shared memory 140.

The BCTL 110 stores the control packet and the data packet from the CPU 200 in the shared memory 140 and reports the same to the ADP 130, and reads the data packet and the control packet specified by the ADP 130 from the shared memory 140 to the CPU 200. This is the controller that transfers data.

ACTL 120 is an ATM network 1
AAL-PDU (ATM Ad)
application Layer-Protocol D
data unit), stored in the shared memory 140 and reported to the ADP 130. Also, the AAL-PDU instructed to be transmitted from the ADP 130 is read out from the shared memory 140 and divided into cells.
This is the controller that sends to 0.

The VC selection section 132 of the ADP 130
The control information added to the head of the packet reported from the TL 110 is checked, and in the case of a data packet, the destination address is checked.

At this time, the VC selector 13 of the ADP 130
2 is a network layer address or a MAC (Media Access).
(Control) address or the like, which is an address of an upper layer of the ATM layer.

The VC selection unit 132 of the ADP 130 looks up the address resolution table by the transmission destination address, thereby obtaining one VC associated with the transmission destination address.
Number (VPI: Virtual Path Ident)
ifier / VCI: Virtual Channel
Identifier) or an ATM address, and instructs the ACTL 120 to transmit the packet, using this as the destination of the packet in the ATM network 150.

The address resolution table is previously input as configuration definition information 141 that defines the configuration of the ATM network 150, or is separately created using an existing address resolution protocol.

In the virtual connection selection device of this embodiment, the address solution table associates one destination address with a group of a plurality of VC numbers (VPI / VCI) or a group of a plurality of ATM addresses. Extended address resolution table 145 for each group
have.

The VC selection unit 132 of the ADP 130 looks up the address resolution table, obtains a VC number (VPI / VCI) or a group of ATM addresses to be paired with the destination address, and then expands the address resolution table 145.
Is compared, the protocol header condition in the table is compared with the protocol header of the packet, and a unique VC number (VPI / VC) paired with the matching protocol header condition
I) or obtain an ATM address, and use this as the destination address in the ATM network 150.
0 is instructed to transmit a packet.

If the packet reported from the BCTL 110 is a control packet, the ADP 130
00, the response packet is created in the shared memory 140, and the BCTL 110 is transferred to the CPU 200 so as to transfer the created response packet to the CPU 200.
To

The ADP 130 receives the AAL-PDU in the shared memory 140 reported from the ACTL 120.
Is converted into a data packet to be reported to the CPU 200, and the BCTL 110 is instructed to transfer the converted data packet to the CPU 200.

The shared memory 140 includes the BCTL 110, A
Accessible from CTL 120, ADP 130,
Configuration definition information 141 including the definition of the VC to be used, protocol header condition designation, etc., a descriptor area 142 for securing the required number of descriptors for storing control information on packets, a packet for storing data packets, control packets, and AAL-PDUs A data buffer area 143 for securing the required number of buffers and a control table area 144 for storing a control table of the ADP 130 such as an extended address resolution table 145 are provided.

In the address resolution table of the virtual connection selection device of the present embodiment, one destination address of a packet is associated with a group of a plurality of VC numbers (VPI / VCI) or a group of a plurality of ATM addresses. The correspondence between the destination address and the plurality of VC numbers needs to be performed in consideration of addressing to a device connected via the ATM network 150.

In the following, in the virtual connection selecting apparatus of the present embodiment, the network layer address given as the address of the upper layer protocol of the communicating apparatus and the ATM shown as the destination in the ATM network 150 will be described.
The relationship between the address and the VC will be described with reference to FIG. 2, Table 1, and Table 2.

FIG. 2 is a diagram showing an example of an ATM network configuration of the virtual connection selection device of the present embodiment. In FIG. 2, 211, 212, and 213 are end systems (hereinafter, referred to as ESs), 221, 222, and 223 are virtual connections, 230 is an ATM switch,
241, 242 and 243 are physical connections.

As shown in FIG. 2, in the ATM network configuration of the virtual connection selection device of the present embodiment, an example is shown in which three ESs 211, 212 and 213 having an ATM interface are interconnected around one ATM switch 230. Represents.

The physical connections 241, 242 and 243
ATM switch 23 from ES 211, 212 and 213
0 shows a physical connection to 0.

The virtual connection 221, the virtual connection 222, and the virtual connection 223
12 shows a VC set between the FBs 12 and 213.

As shown in FIG. 2, in the virtual connection selection device of the present embodiment, the VC set between the same grounds between the ES 211 and the ES 212 in the same manner as when the conventional virtual connection selection device is used. Is one,
Between the ES 211 and the ES 213, a plurality of (two in the example of FIG. 2) VCs are set between the same grounds.

Table 1 is a table showing an example of address assignment in the virtual connection selection device of the present embodiment.

[0071]

[Table 1]

As shown in Table 1, in the virtual connection selection device of the present embodiment, “ESA1” is assigned to the ES 211 as a network layer address, and “ATM-ESA1” is added to the basic portion of the ATM address, and the extended portion is assigned to the ATM address. Two ATM addresses of “1” and “2” are assigned, and the number of ATM addresses is V
C is equal to the number.

The ES 212 is provided with "ESA2" as a network layer address and "ATM-ESA2" as an ATM address.

The ES 213 is provided with "ESA3" as a network layer address, "ATM-ESA3" as a basic part of the ATM address, and "1" as an extended part.
And “2”.

In the case where an ATM address is used as a communication destination in the virtual connection selection device of the present embodiment, the ATM FORUM, UNI (User Net)
NSAP (Network Service) defined in the Work Interface (3.0) and 3.1.
e Access Point (EAccess Point) type network prefix and ESI (End System Ide)
ntifier) to the ATM address basic part, SEL
(Selector) is applied to the ATM address extension part.

When a VPI / VCI is used as a communication destination, VPI is applied to an ATM address basic part and VCI is applied to an ATM address extension part.

In the virtual connection selection device of this embodiment, since the application of the ATM address to the basic portion and the extension portion is performed as described above, the implementation is easy and the virtual connection selection device of this embodiment is easy to implement. It is possible to perform communication without impairing the interconnectivity with a device that does not support.

Table 2 is a table showing the correspondence between network addresses, ATM addresses, and VC numbers in the virtual connection selection device of the present embodiment.

[0079]

[Table 2]

Table 2 shows the correspondence between addresses and VCs managed in the address resolution table created by the ES 211 shown in FIG. 2 and the extended address resolution table 145 of the virtual connection selection device of this embodiment.

In the virtual connection selecting apparatus according to the present embodiment, a case where the network layer address, which is the destination address at the time of transmission, and the basic part of the ATM address are in one-to-one correspondence, and a plurality of VCs are set between the same grounds Identifies the ATM address extension part, and
The TM address extension and the VC number are associated with each other.

In the virtual connection selecting apparatus of the present embodiment, the correspondence between the network layer address and the basic part of the ATM address is a part managed by an address resolution table according to the prior art, and the correspondence between the ATM address extension part and the VC number is: , Extended address resolution table 145
Manage with.

In the virtual connection selection device of the present embodiment, the shared memory 14 is used to determine the VC to perform packet transmission on the basis of the protocol header condition of the packet to be transmitted.
The extended address resolution table 145 is provided in the control table area 144 of 0.

The procedure from the start-up of the ATMA 100 to the setting and retrieval of the extension address resolution table 145 and the execution of packet transmission in the virtual connection selection apparatus of this embodiment will be described below with reference to FIGS. 5 will be described.

FIG. 3 is a diagram showing an outline of an operation sequence in which an address solution table is created based on the configuration definition information 141 of the virtual connection selecting apparatus of the present embodiment and a packet is transmitted. In FIG. 3, reference numeral 310 denotes a configuration definition information load, 320 denotes a port open instruction, 330 denotes a port open processing end report, 340 denotes a transmission instruction, 350 denotes a signaling message exchange, and 360 denotes a data packet transmission.

As shown in FIG. 3, in the operation sequence in which the address resolution table is created based on the configuration definition information 141 of the virtual connection selecting apparatus of the present embodiment and the packet is transmitted, the configuration is executed when the ATMA 100 is started up. In the definition information load 310, the configuration definition information 141 is loaded from the CPU 200 into the shared memory 140 of the ATMA 100.

Thereafter, CPU 200 issues a port open instruction 32 to ATMA 100 using the control packet.
Notify 0.

AT receiving port open instruction 320
MA 100 is an extended address resolution table creation unit 131
As a control table in the shared memory 140, the extended address resolution table 1 based on the configuration
45, and then an address resolution table.

Further, ATMA100 is ACTL120.
After confirming the connection to the ATM network 150, the CPU 200 notifies the CPU 200 of a port open process end report 330 using a control packet.

After receiving the port open processing end report 330 from the ATMA 100, the CPU 200
00 can be instructed to transmit a packet.

A packet transmission instruction 340 from CPU 200 to ATMA 100 is notified using a data packet storing data to be transmitted.

After receiving the data packet, ATMA1
00, the VC selection unit 132 searches the address resolution table using the destination address of the transmission destination, and if there is an extended address resolution table 145 corresponding to the address resolution table, searches this address and transmits the packet. Acquire a VC number (VPI / VCI) or ATM address.

SVC (Switched Virtual)
l Connection), the acquired ATM
The signaling message exchange 350 with the relay system and the communication partner of the ATM network 150 using the address.
And after establishing the VC, the data packet transmission 360
And execute PVC (Permanent Virtual
l Connection), the data packet transmission 360 is executed for the VC that has already been established.

FIG. 4 shows an outline of an operation sequence for creating an address resolution table using the existing address resolution protocol of the virtual connection selection device of the present embodiment, connecting to a communication partner for address resolution by PVC, and transmitting a packet. FIG. In FIG. 4, reference numeral 410 denotes configuration information loading, 420 denotes a port open instruction, 430 denotes a port open processing end report, 440 denotes an address resolution protocol packet transmission / reception, 450 denotes a transmission instruction, and 460 denotes a data packet transmission.

As shown in FIG. 4, an operation for creating an address resolution table using the existing address resolution protocol of the virtual connection selecting apparatus of the present embodiment, connecting to a communication partner for address resolution by PVC, and transmitting a packet. The sequence shows an operation sequence in the case where the ATMA 100 creates an address resolution table using an existing address resolution protocol, and particularly in a case where a communication partner for address resolution is connected by PVC.

As shown in FIG. 4, the ATMA 100 loads the configuration information 1
41 from the CPU 200 to the shared memory 1 of the ATMA 100
Load into 40.

Thereafter, CPU 200 issues a port open instruction 42 to ATMA 100 using the control packet.
Notify 0.

AT that received port open instruction 420
MA 100 is an extended address resolution table creation unit 131
As a control table in the shared memory 140, the extended address resolution table 1 based on the configuration
Create 45.

Further, ATMA100 is ACTL120.
After the connection to the ATM network 150 has been confirmed, the CPU 200 notifies the CPU 200 of a port open processing end report 430 using a control packet.

After notifying the port open processing end report 430, the ATMA 100 transmits and receives the address resolution protocol packet to and from the communication partner connected to the PVC already set.
Perform 40.

The ATMA 100 sequentially sets the address resolution table upon receiving an address resolution response packet from the communication partner in response to the transmitted address resolution request packet. At this time, the extension address corresponding to each entry of the address resolution table is set. A pointer to the solution table 145 is set.

A packet transmission instruction 450 from CPU 200 to ATMA 100 is notified using a data packet storing data to be transmitted.

After receiving the data packet, ATMA1
00, the VC selection unit 132 searches the address resolution table using the destination address of the transmission destination, and if there is an extended address resolution table 145 corresponding to the address resolution table, searches this address and transmits the packet. Acquire a VC number (VPI / VCI) or ATM address.

Next, the ATMA 100 executes a data packet transmission 460 to the acquired PVC already established.

FIG. 5 shows an outline of an operation sequence for creating an address resolution table using the existing address resolution protocol of the virtual connection selecting apparatus of the present embodiment, connecting to a communication partner for address resolution by SVC, and transmitting a packet. FIG. In FIG. 5, reference numeral 510 denotes a configuration definition information load, 520 denotes a port open instruction, 530 denotes a port open processing end report, 550 denotes a transmission instruction, 540 and 570 exchange signaling messages, 560 denotes an address resolution protocol packet transmission / reception, and 580 denotes a data packet. Transmission.

As shown in FIG. 5, an operation sequence for creating an address resolution table using the existing address resolution protocol of the virtual connection selection device of the present embodiment, connecting to a communication partner for address resolution by SVC, and transmitting a packet. 5 shows an operation sequence in a case where the ATMA 100 creates an address resolution table using an existing address resolution protocol, and particularly in a case where a communication partner to be addressed is connected by SVC.

As shown in FIG. 4, the ATMA 100 loads the configuration information 1
41 from the CPU 200 to the shared memory 1 of the ATMA 100
Load into 40.

Thereafter, CPU 200 issues a port open instruction 52 to ATMA 100 using the control packet.
Notify 0.

AT receiving port open instruction 520
MA 100 is an extended address resolution table creation unit 131
As a control table in the shared memory 140, the extended address resolution table 1 based on the configuration
Create 45.

Further, ATMA100 is ACTL120.
After the connection to the ATM network 150 is confirmed, the CPU 200 notifies the CPU 200 of a port open process completion report 530 using a control packet.

The ATMA 100 notifies the ATM network 150
Exchange 540 of a signaling message with an address resolution server connected to the server to establish a VC.

The packet transmission instruction 550 triggers
Address resolution protocol packet transmission / reception 560 is performed with the address resolution server.

As soon as an address resolution response packet is received from the address resolution server, the address resolution table is sequentially set. At this time, a pointer to the extended address resolution table 145 corresponding to each entry of the address resolution table is set. deep.

The packet transmission instruction 550 from the CPU 200 to the ATMA 100 is notified using a data packet storing data to be transmitted.

The CPU 2 issues a packet transmission instruction 550
The transmission packet received from 00 is registered in the waiting queue in the ATMA 100 until the address resolution table is set, and after the address resolution table is set, the address resolution table is searched.

The ATMA 100 uses the VC selection unit 132 to search the address resolution table using the destination address of the transmission destination, and if there is an extended address resolution table 145 corresponding to the address resolution table, searches the address resolution table. VC number (VPI / VCI) or ATM to send
Get the address.

The ATMA 100 performs signaling message exchange 570 with the relay system and the communication partner of the ATM network 150 using the obtained ATM address, establishes a VC, and executes data packet transmission 580.

Hereinafter, the extended address resolution table 145 referred to when selecting a VC in the virtual connection selection device of the present embodiment will be described.

FIG. 6 is a diagram showing the relationship between each section of the extended address solution table of the virtual connection selection device of this embodiment. In FIG. 6, reference numeral 610 denotes an extended address resolution table management table, 611 denotes a first entry pointer, 612 denotes a last entry pointer, 613 denotes the number of entries, 620 denotes an extended address resolution table entry,
621 is a previous entry pointer, 622 is an ATM address type, 623 is an ATM address length, 624 is an ATM address basic part, 625 is an ATM address extension part, 6
26 is a protocol header condition, and 627 is a next entry pointer.

As shown in FIG. 6, the extended address resolution table of the virtual connection selection device of the present embodiment includes an extended address resolution table management table 610, a first entry pointer 611, a last entry pointer 612,
The number of entries 613, the extended address resolution table entry 620, the previous entry pointer 621, the ATM address type 622, the ATM address length 623, the AT
It has an M address basic part 624, an ATM address extension part 625, a protocol header condition 626, and a next entry pointer 627.

As shown in FIG. 6, in the extended address resolution table of the virtual connection selection device according to the present embodiment, the leading entry pointer 611 stored in the extended address resolution table management table 610 is different from the extended address resolution table entry 620. The last entry pointer 612 indicates the storage location of the last entry of the extended address resolution table entry 620.

The extension address resolution table 145 of the virtual connection selection device of the present embodiment is managed by a head entry pointer 611, a last entry pointer 612, and the number of entries 613 that constitute the extension address resolution table management table 610.

Extended address resolution table entry 620
Is the extended address resolution table management table 610
After the first entry pointer or the last entry pointer 612 searches for the first entry or the last entry, if necessary, it has a previous entry pointer 621 and a next entry pointer 627 used when searching for another entry.

The extended address resolution table entry 620 has an ATM address type 622 and an ATM address length 623 for identifying an ATM address or a VC number.

Extended address resolution table entry 620
Here, the ATM address or the VC number has a table structure capable of identifying the basic part and the extended part like the ATM address basic part 624 and the ATM address extended part 625.

After setting the address resolution table, the ATM address basic part 624 searches the extended address resolution table entry 620, determines the extended address resolution table entry 620 having the same value of the ATM address basic part 624, and Used when searching from a table.

Further, a protocol header condition 626 is provided in the extension address resolution table entry 620, and the provided protocol header condition 626 is associated with the ATM address extension portion 625.

Extension address resolution table entry 620
In the protocol header condition 626, the source address, the destination address, the socket number, and the like are set as conditions for selecting a VC with reference to the configuration definition information 141 loaded from the CPU 200 according to the upper layer protocol.

First, the extended address resolution table creation unit 1
Reference numeral 31 denotes an extended address resolution table entry 620 that associates a protocol header condition 626 in which an address of a VOD server is set with a VC with a high transmission speed, a protocol header condition 626 in which an address of a terminal device is set, and a VC with a low transmission speed. An extension address resolution table 145 having an extension address resolution table entry 620 corresponding to

Next, the VC selection unit 132 compares the protocol header of the packet transmitted at the time of data transfer with a plurality of protocol header conditions 626 in the extended address resolution table 145.

The address indicated by the protocol header is
When the address of the VOD server matches the set protocol header condition 626, a VC number having a high transmission speed is selected from the ATM address extension part 625 of the matching protocol header condition 626 to transfer the data of the packet. I do.

On the other hand, when the address indicated by the protocol header matches the protocol header condition 626 in which the address of the terminal device is set, the corresponding transmission rate is transmitted from the ATM address extension part 625 of the matching protocol header condition 626. , The data transfer of the packet is performed.

In addition, when moving image data is transferred using a VC with a high transmission speed or character data is transferred using a VC with a low transmission speed via a router connecting a plurality of LAN segments. Selects the VC as follows.

First, the extension address resolution table creation unit 1
Reference numeral 31 denotes a protocol header condition 626 in which a socket number used by software for executing VOD processing is set.
An extended address resolution table entry 620 that associates a VC with a high transmission speed with a protocol header condition 626 that sets a socket number used by software that transfers character data and a VC with a low transmission speed. An extended address resolution table 145 having an address resolution table entry 620 is created.

Next, the VC selection unit 132 compares the protocol header of the packet transmitted at the time of data transfer with a plurality of protocol header conditions 626 in the extended address resolution table 145.

When the address indicated by the protocol header is
If the protocol header condition 626 in which the socket number used by the software executing the VOD process is set matches the protocol header condition 626,
The corresponding VC number having a high transmission rate is selected from the ATM address extension part 625 of the corresponding section to perform data transfer of the packet.

On the other hand, if the address indicated by the protocol header matches the protocol header condition 626 in which the socket number used by the software for transferring character data is set, the ATM address extension of the matching protocol header condition 626 is performed. From the part 625, the corresponding VC number with a low transmission rate is selected and the data transfer of the packet is performed.

An address resolution table storing a pointer to the extension address resolution table 145 of the virtual connection selection device according to the present embodiment will be described below.

FIG. 7 is a diagram showing the relationship between each part of the address resolution table of the virtual connection selection device of this embodiment. 7, reference numeral 710 denotes an address resolution table entry, 711 denotes an upper address type, and 712.
Is the upper address length, 713 is the ATM address type, 7
14 is the ATM address length, 715 is the upper address, 71
6 is the ATM address, 717 is the number of waiting packets, 718
Is the waiting packet pointer, 719 is the number of extended entries, 7
20 is an extended address resolution table pointer, and 730 is an address resolution table management table.

As shown in FIG. 7, the address resolution table of the virtual connection selection device of this embodiment has an address resolution table entry 710 and an upper address type 71.
1, an upper address length 712, an ATM address type 713, an ATM address length 714, and an upper address 7
15, the ATM address 716, and the number of waiting packets 71
7, a queued packet pointer 718, an extended entry number 719, and an extended address resolution table pointer 720.
And an address resolution table management table 730.

As shown in FIG. 7, in the address resolution table of the virtual connection selection device of the present embodiment, referring to FIG. 7, the configuration of the address resolution table relates to the virtual connection selection device of the present embodiment. Parts and
The table association with the extended address resolution table 145 is shown.

The main components of the address resolution table entry 710 are an upper address 715 and an ATM address 716.

The higher address 715 includes the ATMA1
00 stores the address of the upper layer protocol supported as the ATM layer.

The address resolution table entry 710 is
The address resolution table management table 730 manages each type of the upper layer protocol address to be stored.

In order to identify the type of this address, the address resolution table entry 710 has an upper address type 711 and an upper address length 712.

The address resolution table entry 71
0 has an ATM address type 713 and an ATM address length 714 in order to identify the ATM address 716, and the number of waiting packets 717 and the waiting packet pointer 718 in order to suspend the packet to be transmitted because the address resolution has not been completed. have.

Further, when setting the address resolution table, the extension address resolution table 145 having the ATM address basic part 624 of the same value is obtained, and the address resolution table is referred to immediately afterwards when the address resolution table is indexed. In order to perform this operation, an extension entry number 719 and an extension address resolution table pointer 720 are provided.

As described above, the address resolution table of the virtual connection selection device of the present embodiment has the extended address resolution table pointer 720 that refers to the extended address resolution table 145, and performs address resolution with the address resolution table. After that, it is possible to refer to the extended address resolution table entry 620 corresponding to the resolved address.

As described above, according to the virtual connection selection device of the present embodiment, a virtual connection whose protocol header matches the protocol header condition is selected, so that the protocol header of the packet for multi-protocol data communication is selected. It is possible to select a specific virtual connection from a plurality of virtual connections according to the content.

Further, according to the virtual connection selecting device of the present embodiment, since the protocol header condition is created with reference to the configuration definition information set in the computer, the configuration definition information set in the communicating computer is changed. By doing so, it is possible to easily change the selection condition of the virtual connection.

Further, according to the virtual connection selecting apparatus of the present embodiment, different protocol header conditions are specified for each of a plurality of virtual connections set between the same destinations, so that a plurality of virtual connections are made between a plurality of computers between the same destinations. It is possible to use a connection.

As described above, the present invention has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention. It is.

[0153]

The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

(1) Since a virtual connection whose protocol header matches the protocol header condition is selected, a specific virtual connection is selected from a plurality of virtual connections according to the contents of the protocol header of a multi-protocol data communication packet. It is possible to do.

(2) The protocol header condition is created by referring to the configuration definition information set in the computer.
By changing the configuration definition information set in the computer that performs the communication, it is possible to easily change the selection condition of the virtual connection.

(3) Since different protocol header conditions are specified for each of a plurality of virtual connections set between the same destinations, a plurality of virtual connections can be used between a plurality of computers between the same destinations.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a virtual connection selection device according to an embodiment.

FIG. 2 illustrates an AT of the virtual connection selection device according to the embodiment;
It is a figure showing an example of M network composition.

FIG. 3 is a diagram showing an outline of an operation sequence for creating an address solution table based on the configuration definition information 141 of the virtual connection selection device of the embodiment and transmitting a packet.

FIG. 4 is a diagram showing an outline of an operation sequence of creating an address resolution table using an existing address resolution protocol of the virtual connection selection device of the present embodiment, connecting to a communication partner whose address is to be resolved by PVC, and transmitting a packet. It is.

FIG. 5 is a diagram showing an outline of an operation sequence of creating an address resolution table using an existing address resolution protocol of the virtual connection selection device of the present embodiment, connecting to a communication partner for address resolution by SVC, and transmitting a packet. is there.

FIG. 6 is a diagram showing the relationship between each section of an extended address solution table of the virtual connection selection device of the embodiment.

FIG. 7 is a diagram showing the relationship between each part of an address resolution table of the virtual connection selection device according to the embodiment;

[Explanation of symbols]

100 ATMA, 110 BCTL, 120 ACT
L, 130: ADP, 131: Extended address resolution table creation unit, 132: VC selection unit, 140: Shared memory,
141: Configuration information, 142: Descriptor area, 143: Data buffer area, 144: Control table area, 145: Extended address resolution table, 15
0: ATM network, 200: CPU, 210: C
PU-ATM adapter connection bus, 211, 212 and 2
13 ES, 221, 222 and 223 virtual connection, 230 ATM switch, 241, 242 and 2
43 ... physical connection, 310 ... configuration information loading, 32
0 ... Port open instruction, 330 ... Port open processing end report, 340 ... Transmission instruction, 350 ... Signaling message exchange, 360 ... Data packet transmission, 410 ...
Configuration information loading, 420 ... Port open instruction, 4
30: Port open processing end report 440: Address resolution protocol packet transmission / reception, 450: Transmission instruction, 4
60: Data packet transmission, 510: Configuration information loading, 520: Port open instruction, 530: Port open processing end report, 550: Transmission instruction, 540 and 57
0 ... Signaling message exchange, 560 ... Address resolution protocol packet transmission / reception, 580 ... Data packet transmission, 610 ... Extended address resolution table management table, 611 ... Top entry pointer, 612 ... Last entry pointer, 613 ... Number of entries, 620 ... Extended address Resolution table entry, 621 ... previous entry pointer, 622 ... ATM address type, 623 ... ATM address length, 624 ... ATM address basic part, 625 ...
ATM address extension part, 626: protocol header condition, 627: next entry pointer, 710: address resolution table entry, 711: upper address type, 7
12 ... upper address length, 713 ... ATM address type, 714 ... ATM address length, 715 ... upper address, 716 ... ATM address, 717 ... waiting packet number, 718 ... waiting packet pointer, 719 ... extension entry number, 720 ... extension address Resolution table pointer,
730: Address resolution table management table.

Claims (3)

[Claims] 1. A virtual connection selection device for selecting a specific virtual connection from a plurality of virtual connections set between a plurality of computers performing data transfer, wherein a protocol header condition of a higher-level protocol performing data transfer and a virtual connection An extended address resolution table creating unit for creating an extended address resolution table for associating the protocol address, and selecting a virtual connection in which a protocol header of a packet transmitted during data transfer matches a protocol header condition in the extended address resolution table. A virtual connection selection device, comprising: a virtual connection selection unit. 2. An apparatus according to claim 1, further comprising: storage means for storing configuration definition information set in a computer that performs communication, wherein said extended address resolution table creating unit refers to the configuration definition information stored in said storage means and stores protocol configuration information. The virtual connection selection device according to claim 1, wherein 3. The extended address resolution table creation unit according to claim 1, wherein different protocol header conditions are set for a plurality of virtual connections set between the same destinations. Virtual connection selection device.