JPH1028122A - Pvc easy setting method of atm network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent erroneous connection by permitting a substitutional signalling function to be incorporated in the software of an ATM exchange, adopting only UNI connected to an ATM terminal side as PVC and permitting UNI between the ATM exchanges to be SVC. SOLUTION: At the time of a PVC easy setting system, the ATM terminals 14 and 15 are connected to the ATM exchanges 11 and 13 as PVC and provided with a fixed logical path. But, connection is executed by SVC from the ATM exchange 11 till the exchange 13 being NNI. Therefore, only a routing table for permitting an ATM address to correspond to a line exists so that the fixed logical path over the ATM exchanges is not provided. So, complicated logical path information is not required to be set in the exchanges 11, 12 and 13. The logical path is set after signalling procedure using the incorporated software VPI=O and VCI=5 is executed. Thus, an ATM network where a high-speed ATM line band is effectively used is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ATM (Async).
(Transfer Mode) network, and more particularly, in an asynchronous transfer mode network connection using an ATM switch, an ATM switch and an ATM switch are used.
UNI (User Network Int) between terminals
(Permanent Vi)
trueConnection) Logical path setting and NNI (Network) over a plurality of ATM switches
The present invention relates to a PVC simple setting method for an ATM network suitable for setting a logical path in a network interface and dynamically setting and releasing a PVC logical path in an ATM terminal.

[0002]

2. Description of the Related Art In a network using an asynchronous transfer mode, the following method has been used for setting a PVC.

[0003] A first method is to use the exchange definition information created in advance by the user to specify the next line to be transferred and
VPI (Virtual Pat) which is an ATM header
hIdentifier) / VCI (Virtual)
Channel Identifier) to the corresponding A
Starting from the ATM exchange connected to the TM terminal, it is strictly and uniquely determined to the target ATM terminal via the relay ATM exchange, and is built into the software of the ATM exchange in the form of a table. In this system, when the exchange is started up, the software incorporated in the exchange sets the hardware of the ATM exchange to fixedly set the PVC which is a logical path.

A second method is an IAB (Internet).
(Architecture Board)
IETF examining technical issues related to LAN
(Internet Engineering Tas
k Force) is the RFC (Request For
Comment), RF
As disclosed as C1695, a network monitoring device connected to an ATM switch sends a MIB (Man
(Agement Information Base)
In the format of the ATM switch, the corresponding AT
From the ATM exchange to which the M terminal is connected,
In this system, the logical path information to the target ATM terminal is passed via the exchange, and the software inside the ATM exchange is converted and created into a table format and is set in the ATM exchange hardware at the same time. is there.

In either method, it is necessary to strictly define the logical path of the relay ATM exchange and verify by another means whether the setting has been correctly performed after PVC setting. If the settings are not correct, it is necessary to review and correct the logical path settings from the beginning. In the first case, A
In the second case, it is necessary to change the table information set in the MIB and start over, so that much work and time are required. .

[0006]

In an ATM network, logically, one line has two VPIs.
56, and 65,536 VCI logical paths can be set for each VPI. When the number of PVCs set in the ATM switch increases due to the expansion of the use of the ATM and the improvement of the capacity of the ATM switch, the defined amount of the PVC call setting information and the M
The number of IB information becomes enormous, and as a result, it is difficult to eliminate any human error, and it is obvious that it is extremely difficult to correctly and uniquely set the logical path of the PVC correctly. is there.

[0007] If there is a partial error in the setting information,
In the case of a multistage relay logical path that passes through many ATM exchanges, there is also a problem that it takes a lot of time to find the cause of a failure.

As a technique for strictly and uniquely defining a logical path, a logical path information obtained by using a dedicated computer for path setting and a dedicated software for path setting separately from an ATM exchange is referred to as user-defined information. However, it is also possible to input MIB information of the network monitoring device, but this leads to an increase in the cost of using the ATM on the user side.

[0009] On the other hand, in order to solve the above-mentioned problem of PVC, ATM terminals are connected not by PVC procedure but by SVC (Sw).
itticed Virtual Connection
n) When connecting to the ATM network by the procedure,
Since it is necessary to install software supporting the signaling procedure for call setup in each ATM terminal device, there is a problem that the price of the ATM terminal device becomes expensive,
When the standardized specification of the signaling protocol for ATM call setting is changed, there is a problem that software of the ATM terminal device must be replaced. Also, ATM
AT, an industry association promoting standardization of technical specifications
In the proxy signaling procedure proposed by the M Forum's signaling technology subcommittee, where the proxy signaling agent is implemented and in what procedure the call is made is not defined, the proxy signaling procedure agent is provided at both ends of the ATM terminal. And calls originating from each other asynchronously, a call collision may occur, the call connection may fail, and a logical path may not be set.

[0010] An object of the present invention is to change the software on the ATM exchange side so that the user can easily set the logical path of the PVC, and avoid call collision by proxy signaling in a simple manner. It is still another object of the present invention to provide a method for easily setting a PVC of an ATM network, which enables a user to dynamically schedule a PVC setting time, so that a high-speed ATM line band can be effectively used.

[0011]

According to the present invention, software installed in an ATM switch includes an ATM Forum UNI 4.0.
By implementing the agent function to execute the proxy signaling procedure proposed in the above, a strictly unique PVC logical path is established between ATM exchanges connected to each of ATM terminals communicating using ATM. Instead of setting correctly, using the signaling SVC performed by the software of the ATM exchange, the logical path is defined in the ATM exchange in advance, the table information is built in the software of the ATM exchange, and the start of the ATM exchange is started. It is no longer necessary to set up the hardware at the time of call up or to create table information in the software of the ATM switch from the MIB information of the network monitoring device and set it in the hardware. By setting the method, artificial logical paths Thereby preventing a constant error, a dedicated computer for setting the logical path is also not required, it does not require verification.

[0012] In addition to the conventional PVC definition, the user adds the ATM address of the partner ATM terminal with which communication is desired and the partner ATM terminal.
The VPI / VCI information used by the terminal and the use request of the proxy signaling procedure are defined to the connected ATM exchange. The software in the ATM switch uses this information and the information in its own routing table to
Obtain route information to the TM terminal.

[0013] The routing table information indicates which ATM
ATM connected to the other party's ATM terminal via the exchange
Have information on how to get to the exchange. This information can be stored in advance in the ATM switch software as table information in a user-defined manner.
orum's P-NNI (Private
-Network Network Interface
e) The configuration information of the ATM exchange is transmitted to the AT using the protocol.
AT is dynamically exchanged by exchanging M exchange software
Table information can also be created inside the M exchange software.

VPI / V used by the partner ATM terminal
The CI information is used to determine a logical path on the called side ATM switch.

Further, by using software built in the ATM exchange as software used for SVC signaling, each of the ATM terminal devices is provided with SVC.
Since there is no need to install signaling software, the cost of the ATM terminal device can be reduced, and the problem that the software of the ATM terminal device must be replaced even when the protocol standardization specification is changed can be avoided.

Further, in addition to the above PVC definition, the user
By setting the valid time of PVC from the definition information or the network monitoring device, the PVC can be eliminated in the time zone that the user does not use for communication, and the ATM switch has a function of automatically setting again when the specified time is reached. A
The bandwidth of the line between the TM exchanges can be effectively used.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a network configuration diagram showing an ATM switching device and an ATM terminal device in an ATM network according to the present invention.

In the network of this embodiment, the ATM terminals 14 and 15 are connected to the ATM switches 11, 12, and 13 respectively.
And are connected by a logical path. ATM terminal 14
Is connected to the ATM switch 11 via a line 21, and the ATM terminal 15 is connected to the ATM switch 13 via a line 24. The ATM switch 11 and the ATM switch 12 are connected by a line 22, and the ATM switch 12 and the ATM switch 13 are connected by a line 23.

The ATM terminals 14 and 15 are recognized by an ATM address uniquely set for each terminal, and each ATM exchange has a routing table corresponding to each ATM address. Therefore, the information from the ATM terminal 14 to the ATM terminal 15 inputted from the line 21 is selected by the ATM exchange 11 from the routing table using the routing table using the ATM address as a key.
Similarly, the information to the ATM terminal 15 input from the line 22 is selected and output from the line 23 according to the routing table of the ATM exchange 12. Further, the information input to the ATM switch 13 is based on the ATM address.
The ATM terminal 15 is recognized, and the line 24 to which the ATM terminal 15 is connected is selected. Thus, the ATM terminal 14
And the ATM terminal 15 are connected by a logical route via an ATM exchange.

In the case of PVC connection, the above-mentioned route information is defined in advance as table information of the ATM exchange for each VPI and VCI, and is set when the exchange is started, or is set to each ATM exchange as MIB information from the network monitoring device. It is a method to do. On the other hand, in the case of the SVC connection, this is a method of setting a logical path as needed, and it is also possible to dynamically change the routing table by using the P-NNI.

In the case of the simple PVC setting method, the ATM terminals 14 and 15, which are UNIs, transmit the PVs to the ATM switches 11 and 13.
C, which has a fixed logical path, but the SVCs from the ATM exchanges 11 to 13 which are NNIs
Because there is only a routing table for associating ATM addresses with lines, there is no fixed logical path across ATM switches. ATM exchange 1
There is no need to set complicated logical path information for 1, 12, and 13. The logical paths are the ATM switches 11, 12, 13
Is set after executing a signaling procedure using the built-in software VPI = 0 and VCI = 5.

FIG. 2 shows an ATM logical path.

The ATM terminal 14 transmits the ATM
The ATM terminal 15 is connected by the exchange 11 and the logical path 34
Is connected to the ATM exchange 13. The logical paths 32 and 34 on the UNI side are PVCs, and individual VPI / V
The CI is set in advance in the software of the ATM switches 11 and 13 in the form of a table.

The ATM exchange 11 and the ATM exchange 13 are connected by a logical path 33. The logical path 33 on the NNI side
Is the SVC, and its VPI / VCI is the ATM switch 1
It is determined after the built-in software executes the signaling procedure between 1 and 13. Therefore, a complicated user definition of the logical path can be omitted.

The logical connection of the logical paths 32, 33, and 34 is performed by the built-in software 3 of the ATM switches 11 and 13.
0,40. ATM exchanges 11 and 13
Embedded software 30 and 40 have a signaling procedure for setting the SVC. In addition to the conventional PVC definition, the user can specify the A
TM address, VPI / VC used by partner ATM terminal
The I information, the request for proxy signaling, and the calling method are defined in the ATM exchange. When the built-in software recognizes that the PVC simple setting procedure is requested by the user definition after the start of the ATM exchange, it knows the ATM addresses of the ATM terminals 14 and 15 from the user definition. If the calling method is defined, the call is made according to the user's specification. If the calling method is not specified, the built-in software autonomously uses the size relationship of the ATM address,
Determine which is the calling party and which is the called party. This A
A method utilizing the magnitude relationship between TM addresses can prevent call collision.

Also, by setting the validity time of the UNI PVC in the software 30 or 40 built in the ATM switch connected to the ATM terminal from the user definition information or the network monitoring device, the time during which a specific task is not used for communication is set. The PVC in the belt is canceled and used for another business. At the designated time, the ATM switch automatically re-
By providing the built-in software with a scheduling function for setting C, the bandwidth of the line between the ATM switches can be effectively used.

FIG. 3 is a flowchart showing a processing sequence of proxy signaling in the ATM exchange 11. A
When the startup of the device itself is completed (step 210), the software in the TM switch sets a PVC logical path for each line, and verifies whether or not a request for proxy signaling (step 211) is user-defined in the PVC. If the proxy signaling is not defined, the conventional PVC setting (step 212) is performed. If proxy signaling has been defined, verify whether the calling method has been defined (step 220). If not defined, a comparison is made between the local ATM address and the counterpart ATM address (step 230). If the local ATM address is large, the signaling frame of VPI = 0, VCI = 5 is also stored in the user-defined information. After the line is selected by the routing table, it is transmitted to the other party. When the own side waits for an incoming call from the other party, the process proceeds to the setting of the PVC logical path of another line as a state of waiting for the call from the other party (step 231).

When the call setup by signaling is completed (step 250), the VPI of the PVC defined in the UNI is set.
/ VCI and VPI / VCI of SVC set by NNI
(Step 251), and a path is set in the hardware.

As described above, in a network using the asynchronous transfer mode, the proxy signaling function is implemented in the software of the ATM exchange, the UNI connected to the ATM terminal is PVC, and the NNI between the ATM exchanges is S.
The effect of setting a virtual PVC logical path by using VC, preventing erroneous connection without defining complicated path information in a relay ATM exchange between ATM terminals, and keeping the price of the ATM terminal device low. There is.

In realizing this connection form, if the built-in software of the ATM exchanges connected to the ATM terminals at both ends make outgoing calls independently and asynchronously, there is a possibility that call collision of signaling may occur. In order to prevent this, the software installed in the exchange determines the originating exchange based on the logical comparison of the ATM address of the ATM terminal or the user's designation, avoids call collision of signaling, and establishes a logical path easily. There is an effect that can be done.

Also, the validity time of the UNI PVC is stored in software in the ATM switch connected to the ATM terminal.
By the user setting from the definition information or the network monitoring device, the PV during the time period when the user does not use for communication is set.
C is eliminated, and the ATM exchange has a function of automatically setting again at the designated time, so that the bandwidth of the line between the ATM exchanges can be effectively utilized.

[0033]

According to the present invention, by changing the software on the ATM exchange side, the user can easily set the logical path of the PVC, and the call collision by the proxy signaling can be avoided in a simple manner. Further, by enabling the user to dynamically schedule the PVC setting time, it is possible to provide a PVC simple setting method for an ATM network that can effectively use the bandwidth of a high-speed ATM line.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a connection form of an ATM network using an asynchronous transfer mode according to an embodiment of the present invention.

FIG. 2 shows a logical path in an ATM network according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a processing sequence of proxy signaling in the ATM exchange according to one embodiment of the present invention.

[Explanation of symbols]

11, 12, 13 ... ATM exchange, 14, 15 ... ATM
Terminals, 21, 24 ... lines (terminal lines), 22, 23 ... lines (relay lines), 30, 40 ... ATM switch software, 32, 33, 34 ... logical paths.

Claims (1)

[Claims] 1. In an ATM network using an asynchronous transfer mode, a proxy signaling function is built in software of an ATM exchange, and a U.S.M.
Only NI is PVC and NNI between ATM exchanges is SV
C, a semi-fixed logical path is set, and AT
A simple PVC setting method for an ATM network, wherein an artificial erroneous connection is prevented without defining complicated route information in a relay ATM exchange between M terminals.