JP2874569B2 - ATM connection bandwidth management method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a second network for exchanging information with a service supply terminal in accordance with a predetermined protocol with a first network in which a service is exchanged using an ATM cell as an information transmission unit of a predetermined size. The present invention relates to a bandwidth management method of an ATM connection used in a network environment in which clients representing a plurality of terminals connected to a network are connected.
L for realizing interconnection between N MAC layers and ATM-LAN
The present invention relates to a bandwidth management method for an ATM connection used in a network environment in which a service is provided between a service supply terminal existing on an ATM-LAN and a service client terminal accommodated in an existing LAN by using AN Emulation technology.

[0002]

2. Description of the Related Art MA of an existing LAN (Local Area Network)
While supporting existing protocols and application assets higher than the C (Media Access Control) layer, ATM (Asy
nchronous Tranfer Mode) To realize interoperability between multi-vendors on the network, the MAC of the existing LAN
LANE that interconnects the ATM layer and the physical layer of ATM-LAN
Mulation technology is being considered.

[0003]

According to the current rules, L
No bandwidth is assigned to the ATM connection set by the AN Emulation function. Therefore, when a service is exchanged between a service supply terminal existing on the ATM-LAN and a service client terminal accommodated in the existing LAN, the existing LAN and the ATM-LAN are exchanged.
Let alone the boundaries of ATM-LAN, for example,
There has been a problem that the communication quality of data requiring high quality such as video cannot be guaranteed.

Accordingly, an object of the present invention is to provide an application which requires a high level of communication quality assurance, such as a video service, by using an LA that is a mixture of an ATM-LAN and an existing LAN.
ATM that enables operation in an environment like N environment
An object of the present invention is to provide a bandwidth management method for a connection.

[0005]

According to the present invention, there is provided an ATM connection bandwidth management method comprising the steps of: providing a service supply terminal to a first network in which service transfer using an ATM cell as an information transmission unit of a predetermined size is performed; A method for exchanging services in a system in which a plurality of terminals representing a plurality of terminals connected to a second network in which information is exchanged according to a protocol is provided, wherein a bandwidth is provided from a client to a service supply terminal. It is characterized in that only one control signal ATM connection without assignment is set, and only one service variable ATM connection for bandwidth change is set from the service supply terminal to the client.

That is, according to the present invention, since the traffic of the service control command transmitted from the service client terminal to the service supply terminal is discrete and generated in a very small amount, the client accommodating a plurality of terminals receives The bandwidth of the control signal ATM connection directed to the service supply terminal on the first network is not specifically reserved, and the bandwidth of the service supply ATM connection directed from the service supply terminal to the client on the first network is changed. The bandwidth in the first network can be effectively used by ensuring that only the necessary bandwidth capacity is secured in a timely manner in response to a service supply request or a service stop request from a terminal in the second network. To

[0007] Even when the same client accommodates a plurality of terminals, only one service supply ATM connection is set, so that a limited number of VC resources can be effectively used.

As a specific method of changing the bandwidth of the service-supplying ATM connection, a service-supplying ATM connection is provided to the service-supplying terminal, as in the ATM connection-bandwidth management method described in claim 1. Is provided with an ATM connection band management table for managing the band of each of the addresses used for the designation of the terminal in the second network. When a service supply request or a service stop request occurs, the service supply terminal refers to the information in the ATM connection bandwidth management table and increases or decreases the bandwidth of the service supply ATM connection. be able to.

According to a second aspect of the present invention, a service supply terminal is provided with a service supply ATM connection band which is provided for each port from a client to a terminal in the second network. AT managed by address used for terminal designation
When a new service supply request is issued from a terminal in the second network, the service supply terminal refers to the information in the ATM connection band management table, and May be adopted under the condition that the bandwidth of the service-supplying ATM connection to which is connected does not exceed the maximum allowable bandwidth of the second network. .

[0010] Then, as in the bandwidth management method of the ATM connection according to the third aspect, the client is provided with:
An ATM connection bandwidth management table for managing the bandwidth of the service supply ATM connection for each port from a client to a terminal in the second network and for each address used for designating the terminal; When a new service supply request is issued from the client, the client refers to the information in the ATM connection bandwidth management table and determines the bandwidth of the service supply ATM connection allocated to the port to which the terminal is connected. Under the condition that the allowable maximum bandwidth of the two networks is not exceeded, a method of permitting an increase in the bandwidth of the ATM connection for service provision may be adopted.

[0011] Further, as in the bandwidth management method for an ATM connection according to claim 4 ,
A first ATM connection bandwidth management table for managing the bandwidth of the ATM connection for service supply for each port from the client to the terminal in the second network is provided, and the bandwidth of the ATM connection for service supply is provided to the service supply terminal. A second management for each address used for designating a terminal in the second network
An ATM connection bandwidth management table is provided, and when a new service supply request is issued from a terminal on the second network, the service supply terminal on the first network transmits information in the second ATM connection bandwidth management table. The client refers to the first ATM connection bandwidth management table and performs a process of increasing the bandwidth by referring to the first ATM connection bandwidth management table. Under the condition that the maximum allowable bandwidth is not exceeded, a method of permitting an increase in the bandwidth of the ATM connection for service provision may be adopted.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. In the following description, terminal A having MACxx as the MAC address will be referred to as “terminal A (MAC address: MACxx)”.

First Embodiment

FIG. 1 shows an AT according to a first embodiment of the present invention.
1 shows a configuration example of a system for realizing an M-connection bandwidth management method.

In the system for realizing the ATM connection bandwidth management method of the embodiment, the existing LAN
Similarly to the Emulation technology, a LAN emulation client 13 that performs bridge connection with the ATM-LAN 11 on behalf of a plurality of existing LAN segments, and an ATM address-MAC address correspondence table (FIG. LAN with 2)
The existence of the Emulation server 14 is specified, and the LAN E
The ATM address of the mulation client is an existing LAN
It is defined as the ATM address of the terminal 12.

Further, in the ATM connection bandwidth management method of the present invention, since the existing ATM transmission technology is used, each ATM-LAN directly connected terminal has an ATM address-VCI correspondence table.
mulation client 13 and service supply terminal 15
Is the ATM address-as shown in FIGS.
It will have a VCI correspondence table.

In the ATM connection bandwidth management method according to the first embodiment, the service supply terminal 15 in the ATM-LAN 11 manages the bandwidth information of the service supply ATM connection 21 so that the communication quality in the ATM-LAN can be improved. Guarantee. For this reason, an ATM connection band management table is prepared in the service supply terminal 15.

As shown in FIG. 5, the AT of the first embodiment
The ATM connection bandwidth management table used in the M connection bandwidth management method includes a service supply terminal 15
VC of ATM connection for service supply starting from
I and its destination terminal (LANEmulation client)
ATM address, the distribution of connection bandwidth by MAC address, and the total bandwidth.

Hereinafter, the existing LAN terminal 12 (MAC address: MAC0) is connected to the LAN emulation client 1
3 (MAC address: MAC3, ATM address: AT
A new service supply request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via M3).
The details of the bandwidth management method of the ATM connection according to the first embodiment will be described by taking as an example a case where a connection bandwidth (2 Mbps) required for service supply is secured.

First, referring to FIG. 6 and FIG.
A bandwidth management method for an ATM connection according to the first embodiment when an ATM connection is not established between the emulation client 13 and the service supply terminal 15 will be described.

In this case, as schematically shown in FIG. 6, the existing LAN terminal 12 (MAC address: MAC0)
Is the MAC address of the service supply terminal 15 (MAC
When the packet including the new service request information is transmitted by designating 5) (process 1-1), the L which has received the packet is transmitted.
The AN Emulation client 13 is a LAN Emula
The ATM address of the service supply terminal 15 is resolved from the ATM address-MAC address correspondence table (see FIG. 2) in the tion server 14 (Processing 1-2: Address Resolution P
Then, a two-way ATM connection (a control signal ATM connection (VCI: VC0) and a service supply ATM connection (VCI: VC1)) between the LAN Emulation client 13 and the service supply terminal 15 without bandwidth allocation is performed. Make settings (process 1-3).

LA receiving ATM connection setting reply
The N Emulation client 13 sends a control signal ATM connection 20 (VC
I: VC0), the packet from the existing LAN terminal is transferred to the service supply terminal 15 (processing 1-4). The service supply terminal 15 that has received the service supply request knows the MAC address (MAC0) of the requesting existing LAN terminal from the contents.

Further, the service supply terminal 15 is connected to a LAN.
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
2 knows that the ATM address is ATM3, and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself to check the ATM address such as ATM3.
It is known that the service connection ATM connection 21 (VCI: VC1) not yet allocated to the terminal having the TM address is set (process 1-5).

The service supply terminal 15 performs signaling processing to provide a service supply ATM connection 21 (VCI: VC) to a terminal having an ATM address of ATM3.
1) Allocates a bandwidth of 2 Mbps required for service supply (processing 1-6). After receiving a bandwidth setting reply, FIG.
As schematically shown in FIG. 5, the ATM connection bandwidth management table stores the VC of the service connection ATM connection.
I (VC1), the MAC address (MAC0) of the requesting existing LAN terminal 12, and the bandwidth (2 Mbps) allocated for it are registered (processing 1-8).

In the ATM connection bandwidth management table shown in FIG. 7, the ATM address of the destination terminal is set to Des
The distribution of the connection bandwidth by MAC address is abbreviated as the distribution by MAC.

Next, referring to FIG. 8 and FIG.
Between the emulation client 13 and the service supply terminal 15, a control signal connection 20 (VCI: VC
0) and the ATM connection 21 for service supply (VCI
Is a VC1, and a bandwidth of 2 Mbps is allocated to only one existing LAN terminal (MAC address: MAC2). ) Is described below.

In this case, as schematically shown in FIG. 8, the existing LAN terminal 12 (MAC address: MAC0)
Is the MAC address of the service supply terminal 15 (MAC
When the packet including the new service request information is transmitted by designating 5) (processing 2-1), the L which has received the packet is transmitted.
The AN Emulation client 13 is a LAN Emula
From the ATM address-MAC address correspondence table (FIG. 2) in the
Resolve M address (Process 2-2) and hold A
By referring to the TM address-VCI correspondence table (FIG. 3), the V of the control signal ATM connection 20 is determined.
CI (VC0) is acquired, and the existing LAN
The packet from the terminal is transferred to the service supply terminal 15 (process 2-3). Upon receiving the service supply request, the service supply terminal 15 determines, based on the content, the existing LAN that is the request source.
It knows the MAC address (MAC0) of the terminal.

After that, the service supply terminal 15
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
2 knows that the ATM address is ATM3, and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself and the ATM connection bandwidth management table (FIG. 9 (a)) to determine the ATM address of ATM3.
It knows the bandwidth allocation of the service-supplying ATM connection 21 (VCI: VC1) set with the terminal having the address (processing 2-4).

The service supply terminal 15 that has obtained such a series of information uses the signaling processing to change the band of the service supply ATM connection 21 (VCI: VC1) to the already allocated band (2 Mbps) to supply a new service. 2
Mbps is added to the total of 4 Mbps (process 2-5), and as shown schematically in FIG. 9, the V of the ATM connection for service supply is stored in the ATM connection bandwidth management table.
The CI (VC1), the MAC address (MAC0) of the requesting existing LAN terminal 12, and the bandwidth (2 Mbps) allocated for it are additionally written (process 2-6).

Next, referring to FIG. 10 and FIG. 11, the existing LAN terminal 12 (MAC address: MAC0) receiving the service is switched to the LAN emulation client 13 (MAC address: MAC3, ATM address: A).
A service stop request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via the TM3) to release the secured connection bandwidth (2 Mbps). The operation procedure will be described.

In the following description, the existing LAN terminal (MAC address: MAC0) is the
TM connection 21 (VCI is VC1, and two existing LAN terminals (MAC address: MAC0, MAC
For 2), a bandwidth of 2 Mbps is assigned to each. ).

In this case, as schematically shown in FIG. 10, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
Specify C5) and issue a service stop request (Process 3-1)
And the LAN Emulation client 13 receiving the packet,
The ATM address of the service supply terminal 15 is resolved from the M address-MAC address correspondence table (FIG. 2) (process 3-2), and the ATM address-VCI held by itself is resolved.
The VCI (VC0) of the control signal ATM connection 20 is acquired by referring to the correspondence table (FIG. 3), and the packet from the existing LAN terminal is transferred to the service supply terminal 15 via the VCI (VC0). 3). Upon receiving the service stop request, the service supply terminal 15 knows the MAC address (MAC0) of the requesting existing LAN terminal from the content thereof.

After that, the service supply terminal 15 is
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
2 by knowing that the ATM address is ATM 3 (ARP processing), and by referring to the ATM address-VCI correspondence table (FIG. 4) held by itself and the ATM connection bandwidth management table (FIG. 11A). , ATM
ATM connection 21 for service provision (VCI: VC
Know the bandwidth allocation of 1) (Process 3-4).

The service supply terminal 15 having obtained such a series of information changes the band of the service supply ATM connection 21 (VCI: VC1) from the allocated band (4 Mbps) to the existing LAN terminal 12 (4 M
AC address: MAC0) is changed to a total of 2 Mbps by subtracting 2 Mbps assigned to (process 3-5),
As schematically shown in FIG. 11, from the ATM connection column for service supply in the ATM connection band management table, the MAC of the requesting existing LAN terminal 12 is obtained.
The address (MAC0) and the description of the band (2 Mbps) allocated for it are deleted (processing 3-6).

Second Embodiment

FIG. 12 shows A according to the second embodiment of the present invention.
1 shows a configuration example of a system for realizing a method of managing a bandwidth of a TM connection.

In a system for realizing the ATM connection bandwidth management method of the second embodiment, a LAN
The emulation client 13 uses the table (ATM address-VCI correspondence table) described in the first embodiment.
In addition, a MAC address-port number correspondence table is provided.

FIG. 13 shows an outline of the MAC address-port number correspondence table. In this manner, the MAC address-port number correspondence table stores the correspondence between the MAC address and the port number of the existing LAN terminal accommodated therein. The ATM used in the second embodiment
The connection bandwidth management table is different from the table of the first embodiment, and as shown in FIG. 14, with respect to the bandwidth of the service connection ATM connection, the LAN Emulati
on Client Distribution by Existing LAN Port and Existing LA
The distribution of N terminals by MAC address is explicitly stored.

In the bandwidth management method of the ATM connection according to the second embodiment, the service supply terminal 15 in the ATM-LAN 11
ATM-LAN by managing the bandwidth information of
Guarantee the communication quality within.

Hereinafter, the existing LAN terminal 12 (MAC address: MAC0) is connected to the LAN emulation client 1
3 (MAC address: MAC3, ATM address: AT
A new service supply request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via M3).
The details of the ATM connection bandwidth management method according to the second embodiment will be described with reference to an example in which a connection bandwidth (2 Mbps) required for service supply is secured.

First, LA will be described with reference to FIGS.
N Emulation client 13 and service supply terminal 1
The bandwidth management method of the ATM connection when the ATM connection is not established between the ATM connection and the ATM connection will be described.

In this case, as schematically shown in FIG. 15, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
When the packet containing the new service request information is transmitted by designating C5) (processing 4-1), the LAN Emulation client 13 that has received the packet transmits the LAN Emu
From the ATM address-MAC address correspondence table (see FIG. 2) in the lation server 14, the service supply terminal 15
Resolves the ATM address (process 4-2) and returns to LANEmula
A two-way ATM connection without bandwidth allocation is set between the option client 13 and the service supply terminal 15 (processing 4-
3).

LA receiving ATM connection setting reply
The N Emulation client 13 transfers the packet from the existing LAN terminal to the service supply terminal 15 using the established control signal ATM connection 20 (VCI: VC0) directed to the service supply terminal 15 (processing 4-4).
I do. The service supply terminal 15 that has received the service supply request knows the MAC address (MAC0) of the requesting existing LAN terminal from the contents.

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
It knows that the ATM address of ATM 2 is ATM 3 (ARP processing), and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself to determine whether the terminal 3 has an ATM address such as ATM 3. Assigned service supply ATM connection 21 (VCI: VC
You will know that 1) is set (Process 4-
Five).

The service supply terminal 15 is an ATM 3
Whether the terminal having the M address is the request source,
In order to recognize whether or not the client is the Emulation client, a message is sent to the terminal requesting confirmation of whether or not its own MAC address is the MAC address (MAC0) of the requesting terminal (processing 4-6). .

The terminal having the ATM address of the ATM 3 that has received the message, if it is the requester, replies with a message indicating that. If it is not the requesting terminal, it refers to the MAC address-port number correspondence table (FIG. 13) as schematically shown in FIG. MAC
A port number in which the terminal having the address is accommodated (in this case, port number 1: port 1) is returned.

[0047] The service supply terminal 15 receiving such a series of information executes the A3 of the ATM 3 by the signaling process.
A bandwidth of 2 Mbps required for service supply is allocated to an ATM connection 21 (VCI: VC1) for service supply to a terminal having a TM address (processing 4-8),
After receiving the bandwidth setting reply, as schematically shown in FIG. 17, the ATM connection bandwidth management table stores the VCI (VC1) of the ATM connection for service supply, the MAC address (MAC0) of the requesting existing LAN terminal 12, and the The port number (port1) and the band (2 Mbps) allocated for it are registered (processing 4-9).

Next, referring to FIG. 18 and FIG.
N Emulation client 13 and service supply terminal 1
5, a control signal connection 20 (VCI: V
C0) and service connection ATM connection 21 (VC
I is VC1 and the existing LA accommodated in port 1
2 Mbps for N terminals (MAC address: MAC1)
, The existing LAN terminal (MAC
Address: 2Mbps for MAC1), 4Mbps in total
s bandwidth is allocated. ) Will be described below in connection with a method of managing the bandwidth of an ATM connection in the case where (1) is already established.

In this case, as schematically shown in FIG. 18, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
C5) is specified, new service request information is issued (process 5-1), and LAN Emulation receiving the packet is performed.
The client 13 resolves the ATM address of the service supply terminal 15 from the ATM address-MAC address correspondence table (FIG. 2) in the LAN emulation server 14 (processing 5-2), and furthermore, the ATM address held by itself.
By referring to the VCI correspondence table (FIG. 3),
VCI of control signal ATM connection 20 (VC0)
, And the packet from the existing LAN terminal is transferred to the service supply terminal 15 via this (process 5-3). The service supply terminal 15 that has received the service supply request,
From the contents, the MAC address (MAC0) of the requesting existing LAN terminal is known.

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
2 knows that the ATM address is ATM3, and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself and the ATM connection bandwidth management table (FIG. 19A) to determine the ATM address of ATM3.
It knows the bandwidth allocation of the service-supplying ATM connection 21 (VCI: VC1) set with the terminal having the M address (processing 5-4).

The service supply terminal 15 is connected to the ATM
Whether the terminal having the ATM address of 3 is the request source,
In order to recognize whether the client is a LAN emulation client, the terminal sends a message requesting confirmation of whether its own MAC address is the MAC address (MAC0) of the requesting terminal (processing 5-5). ).

AT of ATM3 which received the message
If the terminal having the M address is the request source, the terminal replies with a message indicating that fact. If the terminal is not the requesting terminal, it refers to the MAC address-port number correspondence table (FIG. 13) (processing 5-6) to determine the port number in which the terminal having the MAC address of the requesting terminal is accommodated. (In this case, port number 1: port1) is returned.

The service supply terminal 15 having obtained such a series of information refers to the connection column of VC1 in the ATM connection bandwidth management table and determines that the bandwidth of 2 Mbps has already been allocated to port 1. Confirm that this allocated amount is 2Mbps for new service supply
s bandwidth, the maximum allowable bandwidth of the existing LAN (1
0 Mbps (processing 5-7).

Then, the service supply terminal 15 performs the signaling process to allocate the band of the service supply ATM connection 21 (VCI: VC1) to the already allocated band (4M
(bps) plus 2 Mbps for new service supply to a total of 6 Mbps (processing 5-8), and as shown schematically in FIG.
In the service connection ATM connection field, the MAC address (MAC0) of the requesting existing LAN terminal 12, its port number (port1), the bandwidth (2 Mbps) allocated for it, and the total bandwidth of the ATM connection (2 Mbps)
s) is additionally written (process 5-9).

Next, referring to FIG. 20 and FIG. 21, the existing LAN terminal 12 (MAC address: MAC0) receiving the service is switched from the LAN emulation client 13 (MAC address: MAC3, ATM address: A).
A service stop request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via the TM3) to release the secured connection bandwidth (2 Mbps). The operation procedure will be described.

In the following explanation, the existing LAN terminal (MAC address: MAC0)
TM connection 21 (VCI is VC1, total bandwidth is 6 Mbps, and two existing LAN terminals (MAC address: MAC0, MAC
For each of 1), a bandwidth of 2 Mbps is assigned to an existing LAN terminal (MAC address: MAC address) accommodated in port N.
2) (a bandwidth of 2 Mbps is allocated to 2)).

In this case, as schematically shown in FIG. 20, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
Specify C5) and issue a service stop request (Process 6-1)
And the LAN Emulation client 13 receiving the packet,
The ATM address of the service supply terminal 15 is resolved from the M address-MAC address correspondence table (FIG. 2) (processing 6-2), and the ATM address-VCI held by itself is resolved.
The VCI (VC0) of the control signal ATM connection 20 is obtained by referring to the correspondence table (FIG. 3), and the packet from the existing LAN terminal is transferred to the service supply terminal 15 via the VCI (VC0). 3). Upon receiving the service stop request, the service supply terminal 15 knows the MAC address (MAC0) of the requesting existing LAN terminal from the content thereof.

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
2 by knowing that the ATM address is ATM 3 (ARP processing), and by referring to the ATM address-VCI correspondence table (FIG. 4) held by itself and the ATM connection bandwidth management table (FIG. 21 (a)). , ATM
ATM connection 21 for service provision (VCI: VC
The bandwidth allocation of 1) is known (processing 6-4).

The service supply terminal 15 having obtained such a series of information changes the band of the service supply ATM connection 21 (VCI: VC1) from the allocated band (6 Mbps) to the existing LAN terminal 12 ( M
AC address: MAC0) is changed to a total of 4 Mbps by subtracting 2 Mbps allocated to MAC0) (processing 6-5),
As schematically shown in FIG. 21, the service connection ATM connection column in the ATM connection band management table is used to check the MAC address of the request source existing LAN terminal 12.
The address (MAC0) and the description of the band (2 Mbps) allocated for it are deleted (processing 6-6).

Third Embodiment

FIG. 22 is a diagram showing an example of A according to the third embodiment of the present invention.
1 shows a configuration example of a system for realizing a method of managing a bandwidth of a TM connection.

In the bandwidth management method of the ATM connection according to the third embodiment, the LAN emulation client 13
Manages the bandwidth information of the service-supplying ATM connection 21 to guarantee the communication quality in an environment where a plurality of similar service-supply terminals exist on the ATM-LAN. Therefore, LAN Emulation Client 1
3 has an ATM connection bandwidth management table in addition to the tables described in the second embodiment (ATM address-VCI correspondence table, MAC address-port number correspondence table).
Only the M address-VCI correspondence table is provided.

FIG. 23 shows an outline of the ATM connection band management table provided in the LAN Emulation client. As described above, the ATM connection bandwidth management table used in the third embodiment includes LAN E
LANE of connection bandwidth of service connection ATM connection 21 ending with mulation client 13
The distribution by the existing LAN port number of the mulation client and the distribution by MAC address of the existing LAN terminal are stored.

Hereinafter, the existing LAN terminal 12 (MAC address: MAC0) is connected to the LAN emulation client 1
3 (MAC address: MAC3, ATM address: AT
A new service supply request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via M3).
The details of the ATM connection bandwidth management method according to the third embodiment will be described with reference to an example in which a connection bandwidth (2 Mbps in the following description) required for service supply is secured.

First, LA will be described with reference to FIGS.
N Emulation client 13 and service supply terminal 1
The bandwidth management method of the ATM connection when the ATM connection is not established between the ATM connection and the ATM connection will be described.

In this case, as schematically shown in FIG. 24, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
Specifying C5) and issuing a new service request (Process 7-
1) and the LAN Emulation client 13 that has received the packet
From the TM address-MAC address correspondence table (FIG. 2), the ATM address of the service supply terminal 15 is resolved (process 7-2), and a bidirectional ATM without bandwidth allocation between the LAN emulation client 13 and the service supply terminal 15 is obtained.
Connection (control signal ATM connection 20 (V
CI: VC0) and ATM connection 2 for service supply
1 (VCI: VC1)) (processing 7-3).

LA receiving ATM connection setting reply
The N Emulation client 13 transfers the packet from the existing LAN terminal to the service supply terminal 15 using the control signal ATM connection 20 (VCI: VC0) directed to the established service supply terminal 15 (processing 7-4). . Service supply terminal 1 that has received a service supply request
5 is based on the content, and indicates the M
The user will know the AC address (MAC0).

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
The ATM address of ATM2 is ATM3 (existing LAN Emula
In the technology, ATM-LA on behalf of existing LAN terminals
LAN Emulation Client A that connects to N
It is assumed that the TM address is the ATM address of the existing LAN terminal. ) (ARP processing), and by referring to the ATM address-VCI correspondence table (FIG. 4) held by itself, the ATM such as ATM3
It is known that a service-supplying ATM connection 21 (VCI: VC1) for which a band has not been allocated has been set up with the LAN emulation client 13 having the address (processing 7-5).

After that, the service supply terminal 15 is connected to the LAN
Even if the VCI (VC1) of the ATM connection for service supply, the MAC address (MAC0) of the requesting terminal, and the band (2 Mbps) to be allocated for it are declared to the emulation client 13, the connection band may be increased. Ask if it is okay (processing 7-
6).

Upon receiving the report, the LAN emulation client 13 changes its MAC address to the MA of the requesting terminal.
If the MAC address is the C address, the ATM connection bandwidth increase permission is transmitted. If the MAC address of the own terminal does not match the MAC address of the requesting terminal, the internal M
Referring to the AC address-port number correspondence table (FIG. 13), the port number accommodating the terminal having the MAC address of the requesting terminal is recognized, and further, the ATM connection bandwidth management table (FIG. 26 (a)) See
The total of the bandwidth already allocated to the corresponding port by a plurality of ATM connections is calculated.

If the value obtained by adding the bandwidth of 2 Mbps for supplying the new service to the already allocated bandwidth does not exceed the allowable maximum bandwidth of the existing LAN, the LAN Emulati.
The on client 13 replies the connection bandwidth increase permission (ACK) and the new setting value of the bandwidth to the service supply terminal 15, and replies a connection bandwidth increase rejection (NACK) if the allowable bandwidth of the existing LAN is exceeded. I do.

In this embodiment, each table is referred to (processing
7-7) Then, the requesting terminal (MAC address: MAC0)
Is accommodated in the port 1 and the bandwidth already allocated to the port 1 is found to be “0”.
As schematically shown in FIG. 5, the service supply terminal 15
In response to the request, the connection bandwidth increase permission (ACK) and the new set value (2 Mbps) are returned.

As a result, the service supply terminal 15 performs 2 Mbps required for service supply to the service supply ATM connection 21 (VCI: VC1) toward the LAN Emulation client 13 having the ATM address of ATM 3 by the signaling process. (Processing 7-8), LAN Emulation client 13
26, the VCI (VC1) of the service connection ATM connection 21 and the request source existing LAN terminal 1 are stored in the ATM connection band management table, as schematically shown in FIG.
2 MAC address (MAC0) and its port number (por
t1) and the band (2 Mbps) allocated for it are registered (processing 7-9).

In this embodiment, the service supply terminal 15 is
Processing for asking the AN Emulation client 13 whether the bandwidth may be increased (processing 7-6) and processing for increasing the bandwidth of the connection by signaling
(Processing 7-8) is separated. For example, if the standard signaling process is extended so that the MAC address of the requesting terminal and the band to be allocated can be described in the signaling message, these processes are reduced to one. In this case, the service supply terminal 15 applies the bandwidth increase permission and increases the bandwidth at the same time as the LAN emulation client 13.
Will only need to allow or deny the bandwidth increase signaling.

Next, referring to FIGS. 27 and 28, LA
N Emulation client 13 and service supply terminal 1
5, a control signal connection 20 (VCI: V
C0) and service connection ATM connection 21 (VC
I is VC1 and the total bandwidth is 4 Mbps (existing LAN terminal (MAC address: MAC address accommodated in port 1)
2 Mbps for 1), 2M for existing LAN terminals (MAC address: MAC1) accommodated in port N
The bandwidth management method of the ATM connection in the case where the bandwidth of bps is allocated) has already been established.

In this case, as schematically shown in FIG. 27, the existing LAN terminal 12 (MAC address: MAC address:
0) is the MAC address (MA) of the service providing terminal 15.
C5) is designated and new service request information is issued (process 8-1). When the packet is received, the LAN emulation is received.
The client 13 resolves the ATM address of the service supply terminal 15 from the ATM address-MAC address correspondence table (FIG. 2) in the LAN emulation server 14 (processing 8-2), and furthermore, the ATM address held by itself.
By referring to the VCI correspondence table (FIG. 3),
VCI of control signal ATM connection 20 (VC0)
, And the packet from the existing LAN terminal is transferred to the service supply terminal 15 via this (process 8-3). The service supply terminal 15 that has received the service supply request,
From the contents, the MAC address (MAC0) of the requesting existing LAN terminal is known.

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
It knows that the ATM address of ATM 2 is ATM3 (APR processing), and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself to communicate with the LAN emulation client 13 having the ATM address of ATM3. Service connection ATM connection 2
1 (VCI: VC1) is found to be set (process 8-4).

After that, the service supply terminal 15 is connected to the LAN
Even if the VCI (VC1) of the ATM connection for service supply, the MAC address (MAC0) of the requesting terminal, and the band (2 Mbps) to be allocated for it are declared to the emulation client 13, the connection band may be increased. Ask if it is OK (Process 8-
Five).

Upon receiving the declaration, the LAN emulation client 13 changes its MAC address to the MA of the requesting terminal.
If the MAC address is the C address, the ATM connection bandwidth increase permission is transmitted. If the MAC address of the own terminal does not match the MAC address of the requesting terminal, the internal M
Referring to the AC address-port number correspondence table (FIG. 13), the port number accommodating the terminal having the MAC address of the requesting terminal is recognized, and further, the ATM connection bandwidth management table (FIG. 28 (a)) See
The total of the bandwidth already allocated to the corresponding port by a plurality of ATM connections is calculated.

If the value obtained by adding the bandwidth of 2 Mbps for supplying the new service to the already allocated bandwidth does not exceed the allowable maximum bandwidth of the existing LAN, the LAN Emulati.
The on client 13 replies the connection bandwidth increase permission (ACK) and the new setting value of the bandwidth to the service supply terminal 15, and replies a connection bandwidth increase rejection (NACK) if the allowable bandwidth of the existing LAN is exceeded. I do.

In this embodiment, each table is referred to (processing
8-6) Then, the requesting terminal (MAC address: MAC0)
Is accommodated in the port 1, and the bandwidth already allocated to the port 1 is 2 Mbps, and it is found that the allocated bandwidth + the new allocated bandwidth <the maximum allowable bandwidth is established. The Emulation client 13
For the service supply terminal 15, the connection bandwidth increase permission (ACK) and the new setting value (4 Mbps + 2 Mbps = 6)
Mbps).

As a result, the service supply terminal 15 performs signaling processing to add the bandwidth of the service supply ATM connection 21 (VCI: VC1) to the already allocated bandwidth (4 Mbps) plus 2 Mbps for new service supply. Change to 6Mbps (processing 8-7)
As schematically shown in FIG. 28, the lation client 13 stores the VCI (VC1) of the service-supplying ATM connection 21 and the MAC address (MAC) of the requesting existing LAN terminal 12 in the ATM connection band management table.
0), its port number (port1), and the bandwidth (2 Mbps) allocated for it are registered (processing 8-8).

The service supply terminal 15 is connected to the LAN E
Processing for asking the mulation client 13 whether the bandwidth may be increased (processing 8-5) and processing for reducing the bandwidth of the connection by signaling (processing 8-7)
As described above, for example, the standard signaling process is extended so that the MAC address of the requesting terminal and the band to be allocated can be described in the signaling message, so that the process is performed in one signaling process. You may do it.

Next, referring to FIG. 29 and FIG. 30, the existing LAN terminal 12 (MAC address: MAC0) receiving the service supply is switched from the LAN emulation client 13 (MAC address: MAC3, ATM address: A).
A service stop request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via the TM3) to release the secured connection bandwidth (2 Mbps). The operation procedure will be described.

In the following description, the existing LAN terminal (MAC address: MAC0)
TM connection 21 (VCI is VC1, total bandwidth is 6 Mbps, and two existing LAN terminals (MAC address: MAC0, MAC
For each of 1), a bandwidth of 2 Mbps is assigned to an existing LAN terminal (MAC address: MAC address) accommodated in port N.
A bandwidth of 2 Mbps is allocated to 2). )
It is assumed that the service is supplied through.

In this case, as schematically shown in FIG. 29, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
Specify C5) and issue a service stop request (Process 9-1)
And the LAN Emulation client 13 receiving the packet,
The ATM address of the service supply terminal 15 is resolved from the M address-MAC address correspondence table (FIG. 2) (processing 9-2), and the ATM address-VCI held by itself is resolved.
The VCI (VC0) of the control signal ATM connection 20 is acquired by referring to the correspondence table (FIG. 3), and the packet from the existing LAN terminal is transferred to the service supply terminal 15 via the VCI (VC0) (processing 9-). 3). Upon receiving the service stop request, the service supply terminal 15 knows the MAC address (MAC0) of the requesting existing LAN terminal from the content thereof.

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
It knows that the ATM address of ATM 2 is ATM 3 (ARP processing), and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself to communicate with the LAN emulation client 13 having the ATM address of ATM 3. Service connection ATM connection 2
1 (VCI: VC1) is found to be set
(Processing 9-4).

The service supply terminal 1 that has obtained such information
5 is for the LAN emulation client 13
VCI of service connection ATM connection (VC1)
And the MAC address (MAC0) of the requesting terminal, and asks whether the connection bandwidth can be reduced (processing 9-5).

The LAN emulation client 13 having received the report refers to the ATM connection bandwidth management table (FIG. 30 (a)) (processing 9-6), and executes the service supply A.
Among the total bandwidth of the TM connection 21 (VCI: VC1), it recognizes that the bandwidth allocated to MAC0 is 2 Mbps, and allows the service supply terminal 15 to permit connection bandwidth reduction (ACK) and a new set value (ACK). 6Mbp
s -2 Mbps = 4 Mbps).

The service supply terminal 15 performs the service supply ATM connection 21
The bandwidth of (VCI: VC1) is changed to 4 Mbps (processing 9-7), and the LAN emulation client 13 executes the process shown in FIG.
0, the MAC address (MA) of the request source existing LAN terminal 12 is obtained from the service supply connection column in the ATM connection band management table.
C0) and the band (2 Mbps) allocated for it are deleted (processing 9-8).

The service supply terminal 15 is connected to the LAN E
Processing for asking the mulation client 13 whether the bandwidth can be reduced (processing 9-5) and processing for reducing the bandwidth of the connection by signaling (processing 9-7)
As described above, the signaling function may be extended in a single signaling process by extending the signaling function.

Fourth Embodiment

FIG. 31 is a view showing A according to the fourth embodiment of the present invention.
1 shows a configuration example of a system for realizing a method of managing a bandwidth of a TM connection.

In the bandwidth management method of the ATM connection according to the fourth embodiment, the service supply terminal on the ATM-LAN and the LAN Emu which is a boundary between the ATM-LAN and the existing LAN are used.
The lation client divides and manages the bandwidth information of the service connection ATM connection. For this reason, as shown, the LAN emulation client 13
An ATM address-VCI correspondence table, a MAC address-port correspondence table, and an ATM connection band management table are provided, and the service supply terminal 15 is provided with an ATM address-VCI correspondence table and an ATM connection band management table.

FIG. 32 and FIG.
The outline of the ATM connection band management table provided in the Emulation client and the service supply terminal is shown. As described above, in the ATM connection bandwidth management table provided in the LAN emulation client, the distribution of the existing LAN port of the LAN emulation client for the bandwidth of the service supply ATM connection ending at the terminal itself is stored, and the service supply terminal The ATM connection bandwidth management table provided therein stores the distribution of the MAC addresses of the existing LAN terminals with respect to the bandwidth of the ATM connection for service supply starting from itself.

Hereinafter, the existing LAN terminal 12 (MAC address: MAC0) is connected to the LAN emulation client 1
3 (MAC address: MAC3, ATM address: AT
A new service supply request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via M3).
The details of the ATM connection bandwidth management method according to the fourth embodiment will be described, taking as an example a case where a connection bandwidth (2 Mbps in the following description) required for service provision is secured.

First, LA will be described with reference to FIGS.
N Emulation client 13 and service supply terminal 1
The bandwidth management method of the ATM connection when the ATM connection is not established between the ATM connection and the ATM connection will be described.

In this case, as schematically shown in FIG. 34, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
C5) and issue a new service request (Process 10
-1) and the LAN Emulation client 13 receiving the packet sends the ATM address-MAC address correspondence table in the LAN emulation server 14 (FIG. 2).
Resolves ATM address of service supply terminal 15 from
(Processing 10-2) LAN Emulation Client 1
3 and a service providing terminal 15 with no bidirectional ATM connection (control signal ATM connection 2
0 (VCI: VC0) and the service supply ATM connection 21 (VCI: VC1)) are set (process 10-3).

LA receiving ATM connection setting reply
The N Emulation client 13 transfers the packet from the existing LAN terminal to the service supply terminal 15 by using the control signal ATM connection 20 (VCI: VC0) directed to the established service supply terminal 15 (processing 10-4).
I do. The service supply terminal 15 that has received the service supply request knows the MAC address (MAC0) of the requesting existing LAN terminal from the contents.

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
The ATM address of ATM2 is ATM3 (existing LAN Emula
In the technology, ATM-LA on behalf of existing LAN terminals
LAN Emulation Client A that connects to N
It is assumed that the TM address is the ATM address of the existing LAN terminal. ) (ARP processing), and by referring to the ATM address-VCI correspondence table (FIG. 4) held by itself, the ATM such as ATM3
It is informed that the service connection ATM connection 21 (VCI: VC1) to which the bandwidth has not been allocated has been set up with the LAN emulation client 13 having the address (process 10-5).

Thereafter, the service supply terminal 15 is connected to the LAN
For the Emulation client 13, the VCI (VC1) of the ATM connection for service supply, the MAC address (MAC0) of the requesting terminal, the band to be allocated for it (2 Mbps), the new setting value of the connection band (2 Mbps), etc. The processing for increasing the connection bandwidth to the new set value is started using the signaling packet in which the information of the above is described (processing 10-6).

On the ATM network side, the resource management / reservation function is used to secure the required resources in consideration of the required bandwidth, and if the resource cannot be reserved, the connection to the service supply terminal 15 is made. Bandwidth increase rejection is returned, and the process will end at that point.

If resources can be secured, the AT
On the M network side, a connection bandwidth increase request is transmitted to the LAN emulation client 13. LAN Emu
The lation client 13 permits the process of increasing the connection band when its own MAC address is the MAC address of the requesting terminal, and when its own MAC address does not match the MAC address of the requesting terminal. ,
The ATM connection bandwidth management which refers to the internal MAC address-port number correspondence table, recognizes the port number in which the terminal having the MAC address is accommodated as the request source terminal, and further specifies the allocation for each port on the existing LAN side. Referring to the table, the total of the bandwidth already allocated to the corresponding port by the plurality of ATM connections is calculated.

If the value obtained by adding the bandwidth of 2 Mbps for supplying a new service to the already allocated bandwidth does not exceed the allowable maximum bandwidth of the existing LAN, the LAN Emulati.
The on-client 13 permits the connection bandwidth increasing process, and if it exceeds the allowable maximum bandwidth of the existing LAN,
Allow connection bandwidth increase processing.

In this embodiment, the requesting terminal (MAC address: MAC0) is accommodated in port 1;
The bandwidth already allocated to port 1 is “0” (FIG. 3
6 (a)), the LAN emulation client 13
Allows the service supply terminal 15 to increase the connection bandwidth as schematically shown in FIG.

Then, the LAN emulation client 13 sends the VCI (VC1) of the service supply ATM connection 21 as schematically shown in FIG.
And the MAC address of the requesting existing LAN terminal 12 (MAC
0) and the allocated bandwidth (2 Mbps)
It is written into the ATM connection bandwidth management table that internally stores the existing LAN-side port-specific distribution (process 10-8).

At the same time, the service supply terminal 15
As schematically shown in FIG. 37, an ATM provided therein and specifying the MAC address of an existing LAN terminal.
The VCI (VC1) of the service-supplying ATM connection 21, the MAC address (MAC0) of the requesting existing LAN terminal 12, and the bandwidth (2 Mbps) allocated for it are registered in the connection bandwidth management table (processing 10-9). .

Next, referring to FIGS. 38 and 40, LA
N Emulation client 13 and service supply terminal 1
5, a control signal connection 20 (VCI: V
C0) and service connection ATM connection 21 (VC
I is VC1, the total bandwidth is 4 Mbps, and port 1
Existing LAN terminal (MAC address: M
A bandwidth management method for an ATM connection when a bandwidth of 2 Mbps is already established for AC1) and a bandwidth of 2 Mbps is assigned to an existing LAN terminal (MAC address: MAC2) accommodated in port N). explain.

In this case, as schematically shown in FIG. 38, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
When C5) is designated and new service request information is issued (process 11-1), the LAN Emulati receiving the packet
on Client 13 is LAN Emulation server 14
The ATM address of the service supply terminal 15 is resolved from the ATM address-MAC address correspondence table (FIG. 2) (process 11-2), and the ATM address-VCI correspondence table (FIG. 3) held by itself is referred to. Thus, the control signal ATM connection 20 VCI (VC
0), and the packet from the existing LAN terminal is transferred to the service supply terminal 15 via it (process 11-3). Service supply terminal 1 that has received a service supply request
5 is based on the contents, and indicates the M of the existing LAN terminal that is the request source.
The user will know the AC address (MAC0).

After that, the service providing terminal 15
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
It knows that the ATM address of ATM 2 is ATM3 (APR processing), and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself to communicate with the LAN emulation client 13 having the ATM address of ATM3. Service connection ATM connection 2
1 (VCI: VC1) is found to be set (process 11-4).

The service supply terminal 15 further specifies the distribution of the MAC addresses of the existing LAN terminals within itself by A
Referring to the TM connection bandwidth management table (FIG. 40A), the total bandwidth (2 Mbps) of the already set service supply ATM connection 21 (VCI: VC1).
) (Process 10-5).

Further, the service supply terminal 15 is connected to the LAN
For the Emulation client 13, the VCI (VC1) of the ATM connection for service supply, the MAC address (MAC0) of the requesting terminal, the band to be allocated for it (2 Mbps), the new setting value of the connection band (2 Mbps), etc. The processing for increasing the connection bandwidth to the new set value is started using the signaling packet in which the information of the above is described (processing 11-6).

On the ATM network side, the resource management / reservation function is used to secure the required resources in consideration of the required bandwidth, and if it is impossible to secure the resources, the connection to the service supply terminal 15 is made. Bandwidth increase rejection is returned, and the process will end at that point.

If resources can be secured, the AT
On the M network side, a connection bandwidth increase request is transmitted to the LAN emulation client 13. LAN Emu
The lation client 13 permits the process of increasing the connection band when its own MAC address is the MAC address of the requesting terminal, and when its own MAC address does not match the MAC address of the requesting terminal. ,
The ATM connection bandwidth management which refers to the internal MAC address-port number correspondence table, recognizes the port number in which the terminal having the MAC address is accommodated as the request source terminal, and further specifies the allocation for each port on the existing LAN side. Referring to the table, the total of the bandwidth already allocated to the corresponding port by the plurality of ATM connections is calculated.

If the value obtained by adding the bandwidth of 2 Mbps for supplying a new service to the already allocated bandwidth does not exceed the allowable maximum bandwidth of the existing LAN, the LAN Emulati.
The on-client 13 permits the connection bandwidth increasing process, and if it exceeds the allowable maximum bandwidth of the existing LAN,
Allow connection bandwidth increase processing.

In this embodiment, the requesting terminal (MAC address: MAC0) is accommodated in port 1;
Since the bandwidth already allocated to the port 1 is 2 Mbps (FIG. 39A), the LAN emulation client 1
3 permits the service supply terminal 15 to increase the connection bandwidth (process 11-6).

Then, the LAN Emulation client 13 transmits the VCI (VC1) of the service supply ATM connection 21 as schematically shown in FIG.
And the MAC address of the requesting existing LAN terminal 12 (MAC
0) and the allocated bandwidth (2 Mbps)
It is written in the ATM connection bandwidth management table that internally stores the existing LAN-side port-specific distribution (process 11-7).

At the same time, the service supply terminal 15
As schematically shown in FIG. 40, an ATM provided therein and specifying the MAC address of an existing LAN terminal.
In the connection band management table, the VCI (VC1) of the service supply ATM connection 21, the MAC address (MAC0) of the requesting existing LAN terminal 12, the band (2 Mbps) allocated for it, and the service supply ATM connection 21 Total bandwidth (6Mbps
) Is written (process 11-8).

Finally, referring to FIG. 41 to FIG. 43, the existing LAN terminal 12 (MAC address: MAC0) receiving the service is switched from the LAN Emulation client 13 (MAC address: MAC3, ATM address:
A case where a service stop request is issued to the service supply terminal 15 (MAC address: MAC5, ATM address: ATM5) on the ATM-LAN 11 via the ATM 3) to release the secured connection bandwidth (2 Mbps). The operation procedure will be described.

In the following description, the existing LAN terminal (MAC address: MAC0)
TM connection 21 (VCI is VC1, total bandwidth is 6 Mbps, and two existing LAN terminals (MAC address: MAC0, MAC
For each of 1), a bandwidth of 2 Mbps is assigned to an existing LAN terminal (MAC address: MAC address) accommodated in port N.
A bandwidth of 2 Mbps is allocated to 2). )
It is assumed that the service is supplied through.

In this case, as schematically shown in FIG. 41, the existing LAN terminal 12 (MAC address: MAC
0) is the MAC address (MA) of the service providing terminal 15.
Specify C5) and issue a service stop request (Process 12-
1) and the LAN Emulation client 13 receiving the packet sends the ATM address-MAC address correspondence table in the LAN emulation server 14 (FIG. 2).
Resolves ATM address of service supply terminal 15 from
(Process 12-2) Also, the ATM address held by itself
By referring to the VCI correspondence table (FIG. 3),
VCI of control signal ATM connection 20 (VC0)
Then, the packet from the existing LAN terminal is transferred to the service supply terminal 15 via this (process 12-3).
Service supply terminal 15 receiving the service stop request
Is based on the content of the request.
The user will know the C address (MAC0).

Further, the service supply terminal 15 is connected to the LAN
From the ATM address-MAC address correspondence table (FIG. 2) in the emulation server 14, the requesting LAN terminal 1
It knows that the ATM address of ATM 2 is ATM 3 (ARP processing), and refers to the ATM address-VCI correspondence table (FIG. 4) held by itself to communicate with the LAN emulation client 13 having the ATM address of ATM 3. Service connection ATM connection 2
1 (VCI: VC1) is found to be set
(Processing 12-4).

The service supply terminal 15 has an AT which specifies the distribution of the MAC addresses of the existing LAN terminals within itself.
With reference to the M connection bandwidth management table (FIG. 43A), the total bandwidth (2 Mbps) of the already set service supply ATM connection 21 (VCI: VC1).
(Processing 12-4).

The service supply terminal 1 that has obtained such information
5 is for the LAN emulation client 13
VCI of service connection ATM connection (VC1)
, The MAC address of the requesting terminal (MAC0) and the new setting value of its connection band (6 Mbps-2 Mbps = 4 M
Using a signaling packet in which information such as bps) is described, a process of reducing the connection bandwidth to a new set value is started (process 12-5).

The ATM network uses the resource management / reservation function to release the necessary resources in consideration of the required bandwidth, and transmits a connection bandwidth reduction request to the LAN emulation client 13. The LAN emulation client 13 refers to the internal MAC address-port number correspondence table, recognizes the port number (port1) in which the terminal having the MAC address of the requesting terminal is accommodated, and as shown in FIG. The service connection ATM connection 21 in the ATM connection bandwidth management table in which the distribution by port on the existing LAN side is specified.
The bandwidth value (4 Mbps) assigned to port 1 is changed to a new value (4 Mbps-2 Mbps = 2 Mbps) (processing 12-6).

At the same time, the service supply terminal 15
An ATM connection bandwidth management table provided inside, which specifies the MAC address of the existing LAN terminal (FIG. 4)
3), the MAC address of the requesting existing LAN terminal 12 (MA
C0) and the bandwidth allocated for it (2 Mbps)
s) is deleted and the total bandwidth is changed to the new setting value (4 Mbps).
) (Processing 12-7).

[0127]

As described in detail above, according to the ATM connection bandwidth management method of the present invention, for example, an LA that accommodates a plurality of existing LAN client terminals
A control signal AT directed from a client such as an N emulation client to a service providing terminal on a first network such as an ATM-LAN.
No special M connection bandwidth is secured,
Further, the bandwidth of the ATM connection for service supply from the service supply terminal to the client is made variable, and, for example, in response to a service supply request or a service stop request from a terminal on a second network such as an existing LAN, Since only the necessary bandwidth capacity is secured, the bandwidth in the first network is effectively used.

Even when the same client accommodates a plurality of existing network client terminals, only one service supply ATM connection is set, so that a finite number of VC resources can be effectively used. Has become.

When the band is managed as in the first or second aspect of the present invention, a new service supply request is issued from a terminal on the second network such as an existing LAN terminal. When this occurs, it is possible to instantaneously determine to what extent the bandwidth of the service-supplying ATM connection can be increased. Similarly, when a terminal already receiving a service issues a service stop request, it becomes possible to instantaneously determine to what extent the bandwidth of the ATM connection for service provision is reduced. In addition, for example, ATM-LAN
Since the service providing terminals on the first network as described above perform the processing intensively, the number of messages exchanged between the service providing terminal and the client can be reduced.

In the case where the client manages the bandwidth as in the third aspect of the present invention, the service supply terminal
When a new service supply request or a service stop request is issued from a terminal on the second network, it is possible to instantaneously determine to what extent the bandwidth of the service supply ATM connection may be increased or decreased. Further, since the bandwidth management is performed by the client located at the boundary between the two networks, even if there are a plurality of similar service supply terminals on the first network, messages are not exchanged between the service supply terminals. Thus, the communication quality of each segment can be guaranteed.

[0131] Also, as in the invention in claim 4, wherein, when the parallel to manage bandwidth by the client and service supply terminal, with a small number of processes to be exchanged between the service supply terminal and the client In addition, even when a plurality of similar service supply terminals exist on the first network, it is possible to guarantee the communication quality of each segment without exchanging messages between the service supply terminals. Become.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a system for realizing an ATM connection bandwidth management method according to a first embodiment of the present invention;

FIG. 2 is a diagram illustrating an L provided in a system for realizing an ATM connection bandwidth management method according to each embodiment of the present invention;
ATM address provided by AN Emulation server-MA
FIG. 4 is an explanatory diagram showing an outline of a C address correspondence table.

FIG. 3 is a diagram illustrating an L provided in a system for realizing the ATM connection bandwidth management method according to each embodiment of the present invention;
FIG. 4 is an explanatory diagram showing an outline of an ATM address-VCI correspondence table provided in an AN Emulation client.

FIG. 4 is an explanatory diagram showing an outline of an ATM address-VCI correspondence table provided in a service supply terminal provided in a system for realizing an ATM connection bandwidth management method according to each embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an outline of an ATM connection band management table provided in a service supply terminal provided in a system for realizing the ATM connection band management method of the first embodiment.

FIG. 6 is a processing flow graph for explaining the ATM connection bandwidth management method according to the first embodiment when an ATM connection is not established;

FIG. 7 is an explanatory diagram showing how the contents of an ATM connection band management table in the service supply terminal change according to the processing flow shown in FIG. 6;

FIG. 8 shows a case where an ATM connection is established.
5 is a processing flow graph for explaining a method of managing a bandwidth of an ATM connection according to the first embodiment.

9 is an explanatory diagram showing how the contents of the ATM connection band management table in the service supply terminal change according to the processing flow shown in FIG. 8;

FIG. 10 is a processing flow graph for explaining a method of managing a bandwidth of an ATM connection according to the first embodiment when a secured connection bandwidth is released;

11 is an explanatory diagram showing how the contents of an ATM connection band management table in a service supply terminal change according to the processing flow shown in FIG. 10;

FIG. 12 is a configuration diagram illustrating a system for realizing an ATM connection bandwidth management method according to a second embodiment of the present invention;

FIG. 13 illustrates an LA provided in a system for realizing the ATM connection bandwidth management method according to the second embodiment.
MAC address provided by N Emulation client-
FIG. 4 is an explanatory diagram showing an outline of a port number correspondence table.

FIG. 14 is an explanatory diagram showing an outline of an ATM connection band management table provided in a service supply terminal provided in a system for realizing an ATM connection band management method according to a second embodiment.

FIG. 15 is a processing flow graph for explaining a first half procedure of the ATM connection bandwidth management method according to the second embodiment when an ATM connection is not established;

FIG. 16 is a process flow graph for explaining the latter half of the procedure of the ATM connection bandwidth management method according to the second embodiment when an ATM connection has not been established;

FIG. 17 is an explanatory diagram showing how the contents of the ATM connection band management table in the service supply terminal change according to the processing flows shown in FIGS. 15 and 16;

FIG. 18 is a processing flow graph for explaining the ATM connection bandwidth management method according to the second embodiment when an ATM connection is established.

19 is an explanatory diagram showing how the contents of the ATM connection band management table in the service supply terminal change according to the processing flow shown in FIG. 18;

FIG. 20 is a process flow graph for explaining a bandwidth management method of an ATM connection according to a second embodiment when a secured connection bandwidth is released.

21 is an explanatory diagram showing how the contents of the ATM connection band management table in the service supply terminal change according to the processing flow shown in FIG. 20;

FIG. 22 is a configuration diagram illustrating a system for realizing an ATM connection bandwidth management method according to a third embodiment of the present invention;

FIG. 23 is a diagram illustrating an LA provided in a system for realizing the ATM connection bandwidth management method according to the third embodiment;
FIG. 9 is an explanatory diagram showing an outline of an ATM connection band management table provided in the N Emulation client.

FIG. 24 is a processing flow graph for explaining a first half procedure of the ATM connection bandwidth management method according to the third embodiment when an ATM connection is not established;

FIG. 25 is a process flow graph for explaining a latter half of a procedure of the ATM connection bandwidth management method according to the third embodiment when an ATM connection is not established;

FIG. 26 is an explanatory diagram showing how the contents of the ATM connection bandwidth management table in the LAN Emulation client change according to the processing flows shown in FIGS. 24 and 25.

FIG. 27 is a processing flow graph for explaining a bandwidth management method for an ATM connection according to the third embodiment when an ATM connection is established.

FIG. 28 shows an example of a LAN according to the processing flow shown in FIG.
FIG. 9 is an explanatory diagram showing a state where the contents of an ATM connection band management table in the Emulation client change.

FIG. 29 is a processing flow graph for explaining a method of managing a bandwidth of an ATM connection according to the third embodiment when a secured connection bandwidth is released;

FIG. 30 shows an example of a LAN according to the processing flow shown in FIG.
FIG. 9 is an explanatory diagram showing a state where the contents of an ATM connection band management table in the Emulation client change.

FIG. 31 is a configuration diagram illustrating a system for realizing an ATM connection bandwidth management method according to a fourth embodiment of the present invention;

FIG. 32 illustrates an LA provided in a system for realizing the ATM connection bandwidth management method according to the fourth embodiment.
FIG. 9 is an explanatory diagram showing an outline of an ATM connection band management table provided in the N Emulation client.

FIG. 33 is an explanatory diagram showing an outline of an ATM connection band management table provided in a service supply terminal provided in a system for realizing the ATM connection band management method according to the fourth embodiment.

FIG. 34 is a processing flow graph for explaining a first half procedure of the ATM connection bandwidth management method according to the fourth embodiment when an ATM connection is not established;

FIG. 35 is a process flow graph for explaining a latter half of a procedure of the ATM connection bandwidth management method according to the fourth embodiment when an ATM connection is not established;

FIG. 36 is an explanatory diagram showing how the contents of the ATM connection band management table in the LAN Emulation client change according to the processing flows shown in FIGS. 34 and 35.

FIG. 37 is an explanatory diagram showing how the contents of the ATM connection band management table in the service supply terminal change according to the processing flows shown in FIGS. 34 and 35.

FIG. 38 is a processing flow graph for explaining the ATM connection bandwidth management method according to the fourth embodiment when an ATM connection is established.

FIG. 39 shows an example of a LAN according to the processing flow shown in FIG. 38;
FIG. 9 is an explanatory diagram showing a state where the contents of an ATM connection band management table in an emulation client change.

40 is an explanatory diagram showing how the contents of the ATM connection band management table in the service supply terminal change according to the processing flow shown in FIG. 38.

FIG. 41 is a processing flow graph for explaining a bandwidth management method of an ATM connection according to a fourth embodiment when a secured connection bandwidth is released.

FIG. 42 shows an example of a LAN according to the processing flow shown in FIG.
FIG. 9 is an explanatory diagram showing a state where the contents of an ATM connection band management table in an emulation client change.

FIG. 43 is an explanatory diagram showing how the contents of the ATM connection band management table in the service supply terminal change according to the processing flow shown in FIG. 41.

[Explanation of symbols]

 10 Existing LAN 11 ATM-LAN 12 Existing LAN Terminal 13 LAN Emulation Client 14 LAN Emulation Server 15 Service Supply Terminal 16 Hub 20 Control Signal ATM Connection 21 Service Supply ATM Connection

Claims (4)

(57) [Claims] An ATM which is an information transmission unit of a predetermined size.
In a system in which a service providing terminal and a client representing a plurality of terminals connected to a second network in which information is exchanged according to a predetermined protocol are connected to a first network in which service exchange using cells is performed, A method for performing service exchange, comprising: setting only one ATM connection for a control signal without bandwidth allocation from the client to the service supply terminal, and from the service supply terminal to the client. In addition to setting only one band-variable service-supplying ATM connection , the service-supply terminal sets the service-supplying ATM connection.
The bandwidth of the connection in the second network
ATM connector to manage for each address used to specify the address
Equipped with an action bandwidth management table, already for service supply
Stored in a client with an ATM connection
A new service supply request or service from the terminal
If a service stop request is issued, the service
The end is the information in the ATM connection bandwidth management table
Of the service connection ATM connection
A bandwidth management method for an ATM connection, characterized by increasing or decreasing a bandwidth. 2. An ATM which is an information transmission unit of a predetermined size.
The first network in which services are exchanged using cells
Then, the information is provided to the service supply terminal according to a predetermined protocol.
Multiple networks connected to the second network
In a system where a client representing a terminal is connected
A method for giving and receiving a service, wherein the client sends the service to the service providing terminal.
In the direction, ATM connection for control signal without bandwidth allocation
Only one is set, and the service
To provide services with variable bandwidth to clients
Only one ATM connection is set, and the service supply terminal is connected to the service supply ATM core.
The bandwidth of the connection from the client to the second network
Used for port designation to terminals in the work and terminal designation.
ATM connection bandwidth management for each address
With a new table from a terminal in the second network.
If a service supply request is issued, the service
The supply terminal is in the ATM connection bandwidth management table.
Service to which the terminal is connected
The bandwidth of the supply ATM connection is
The service shall not exceed the maximum allowable bandwidth.
To increase the bandwidth of the ATM connection for service supply
A bandwidth management method for an ATM connection. 3. An ATM which is an information transmission unit having a predetermined size.
The first network in which services are exchanged using cells
Then, the information is provided to the service supply terminal according to a predetermined protocol.
Multiple networks connected to the second network
In a system where a client representing a terminal is connected
A method for giving and receiving a service, wherein the client sends the service to the service providing terminal.
In the direction, ATM connection for control signal without bandwidth allocation
Only one is set, and the service
To provide services with variable bandwidth to clients
Only one ATM connection is set, and the client connects to the service-supplying ATM connector.
From the client to the second network
Used to specify the terminal by port to the terminal in the network and the terminal
ATM connection bandwidth management data managed by address
A new service from a terminal on the second network.
When a service supply request occurs, the client
Refer to the information in the ATM connection bandwidth management table.
To the port to which the terminal is connected
The service connection ATM connection bandwidth is
Condition that does not exceed the allowable maximum bandwidth of 2 networks
Under the above, the bandwidth of the ATM connection for service provision is increased.
ATM connection band characterized by permitting
Area management method. 4. An ATM which is an information transmission unit having a predetermined size.
The first network in which services are exchanged using cells
Then, the information is provided to the service supply terminal according to a predetermined protocol.
Multiple networks connected to the second network
In a system where a client representing a terminal is connected
Oite, I method der performing service transfer, from the client, headed to the service supply terminal
In the direction, ATM connection for control signal without bandwidth allocation
Only one is set, and the service
To provide services with variable bandwidth to clients
Only one ATM connection is set, and the client connects to the service-supplying ATM connector.
From the client to the second network
First ATM connector that manages by port to terminals within the network
A service bandwidth management table;
Is the bandwidth of the ATM connection for service provision,
Used for specifying a terminal in the second network
Second ATM connection bandwidth management for each address
A table on the second network,
When a service supply request is issued, the first network
The service providing terminal on the network is connected to the second ATM connector.
Increase bandwidth by referring to information in the bandwidth management table
The client performs the first
Referring to the ATM connection bandwidth management table,
The service allocated to the port to which the terminal is connected
The bandwidth of the ATM connection for service supply is the second network
Under the condition that the maximum allowable bandwidth is not exceeded.
Allow the bandwidth increase of the service connection ATM connection.
And a bandwidth management method for an ATM connection.