JP2001045009A - Atm communication network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically execute changeover connection of a path between nodes in a short time. SOLUTION: Permanent virtual channels(PVC) are grouped into a small group consisting of collection of a plurality of permanent virtual channels and an integrated group consisting of collection of a plurality of small groups, and the PVC connection can be established in the unit of the small groups or the global groups. The PVC connection by a global group GA is set up between nodes 1 and 2. A network management unit 50 receiving a notice of a node failure transmits an instruction of switching connection from the node 2 to a node 3 up to the node 1. The node 1 releases the PVC connection by the global group GA and sets up the PVC connection by a global group GB. The network management unit 50 receiving a notice of a node restoration transmits an instruction of switchback connection from the node 3 to the node 2 up to the node 1. The node 1 releases the PVC connection by the global group GB and sets up the PVC connection by the global group GA.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an ATM communication network system, and more particularly to a backup method when an ATM communication network system fails.

[0002]

2. Description of the Related Art A conventional ATM communication network system has a working station node and a backup station node in order to enhance its reliability, and switches to a backup side when a station node fails. For this reason, it is necessary to perform path switching connection. The switching of the path is performed when an individual fixed virtual channel (PVC;
Permanent Virtual Channel
This is performed by releasing the connection in l) and then establishing a new PVC connection to the backup path.

[0003]

SUMMARY OF THE INVENTION Such a conventional AT
The M communication network system has a problem that when the number of PVCs becomes enormous, the processing time required for releasing the PVC connection or establishing the PVC connection increases, which hinders the operation of the ATM communication network system. Was.

In addition, there is a problem that a simple operation error occurs because an operator is always involved in the path switching.

[0005] In addition, in the path switching, the network management device sequentially performs the path switching,
There is a problem in that the load on the node due to the switching instruction from the network management device increases, which hinders the operation of the ATM communication network system.

An object of the present invention is to provide an ATM communication network system which solves the above-mentioned conventional problems and automatically executes a path switching connection between nodes in a short time.

[0007]

The ATM communication network system of the present invention comprises a plurality of fixed virtual channels (PV).
C: Permanent Virtual Channel
e) fixed virtual channel group means for grouping the plurality of fixed virtual channels into a small group formed by collecting and forming a plurality of small groups, and a plurality of fixed groups formed by collecting and forming the plurality of small groups. A small group fixed virtual channel connection means for establishing a channel connection and a general group fixed virtual channel connection means for establishing a fixed virtual channel connection in the general group unit.

An ATM communication network system according to the present invention has a plurality of ports for
In an ATM communication network system having a plurality of nodes for processing M cells and a network management device for managing a network, according to an instruction of the network management device, the supervising group fixed virtual channel connection means establishes a supervision group between the nodes. A fixed virtual channel connection is made in units of small groups, and the small group fixed virtual channel connection means connects fixed virtual channels between the ports of the nodes in small group units.

An ATM communication network system according to the present invention includes an ATM communication network system having a plurality of nodes for processing ATM cells having a plurality of ports for interfacing with the outside and a network management device for managing a network; The network management device includes a node switching instruction for generating a node switching instruction for instructing switching or changing the connection between nodes and a node switching instruction for returning the connection between nodes to the connection before switching or before the change. Return instruction means; according to the node switching instruction from the node switching return instruction means,
A control group fixed virtual channel switching connection means for releasing a fixed virtual channel connection between nodes already established in a control group unit and establishing a fixed virtual channel connection between new nodes in a control group unit; In response to the node switch-back instruction from the switch-back switch instruction unit, the fixed virtual channel connection between nodes for which the switching connection has already been established by the general group fixed virtual channel switching connection unit is released in units of the general group, and before the switching. Alternatively, there is provided an integrated group fixed virtual channel return connection means for re-establishing a fixed virtual channel connection between nodes before the change in units of the integrated group.

Further, an ATM communication network system according to the present invention is an ATM communication network system having a plurality of nodes for processing ATM cells having a plurality of ports for interfacing with the outside, and a network management device for managing a network; The network management device generates a port switching instruction for switching or changing the connection between the ports of the node, and a port switching instruction for returning the connection between the ports of the node to the connection before the switching or before the change. A port switching switchback instructing unit that releases a fixed virtual channel connection between ports that have already been established in units of small groups in accordance with the port switching instruction from the port switching switchback instructing unit; Group fixed to establish a fixed virtual channel connection for each small group Virtual channel switching connection means; fixed virtual channel connection between ports for which a switching connection has already been established by the small group fixed virtual channel switching connection means in response to the port switching instruction from the port switching switching instruction means. And a small group fixed virtual channel reverting connection means for releasing a fixed virtual channel connection between ports before switching or before changing in a small group unit.

Further, in the ATM communication network system according to the present invention, the node notifies the network management device of node failure information indicating that the node has failed and node recovery information indicating that the failure of the node has been restored. A network alarm device, a mapping table storing unit for storing a general group fixed virtual channel mapping table for specifying a general group corresponding to the connection between the nodes, and a node alarm transmitting unit. Based on the node failure information or the node recovery information, the control group fixed virtual channel mapping table is searched to determine and control which control group is to be switched to which control group. A node switching instruction for instructing or switching back from which control group to which control group. Decide And a node switchover instruction unit for generating a node switchover instruction to be displayed; the supervisory group fixed virtual channel switchover connection unit has already been established by the node switchover instruction from the node switchover instruction unit. The fixed virtual channel connection between the nodes is released in units of the controlling group, the fixed virtual channel connection between the new nodes is established in the unit of the controlling group, and the switching has already been performed by the node switching instruction from the node switching instruction unit. The fixed virtual channel connection between the nodes to which the connection has been established is released in units of the control group, and the fixed virtual channel connection between the nodes before switching or before the change is re-established in the unit of control group.

[0012] In the ATM communication network system according to the present invention, the node notifies the network management device of port failure information indicating that the port of the node is faulty and port recovery information indicating that the fault of the port has been recovered. The network management device comprises: a mapping table storage means for storing a small group fixed virtual channel mapping table for designating a small group corresponding to an inter-port connection; and a port from the node alarm transmission means. Based on the failure information or the port recovery information, the small group fixed virtual channel mapping table is searched to determine which small group is to be switched to which small group, and to perform a port switching instruction to instruct or to switch back from which small group to which small group. Po to determine and direct A small-group fixed virtual channel switching connection means for generating a switching instruction from a port of a node which has already been established in response to the port switching instruction from the port switching switching instruction means. The fixed virtual channel connection between the nodes is released in small group units, and the fixed virtual channel connection between the ports of the new nodes is established in small group units. The fixed virtual channel connection between the ports of the nodes where the switching connection is established is released in small group units, and the fixed virtual channel connection between the ports of the nodes before switching or before the change is re-established in small group units. And

[0013]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an ATM communication network system of the present invention, FIG. 2 is a block diagram of a node of the present invention, and FIG. 3 is a block diagram of a network management device of the present invention. 4 is a configuration diagram of a PVC group table, FIG. 5 is a configuration diagram of an overall group PVC status table, FIG. 6 is a configuration diagram of a small group PVC status table, and FIG. 7 is a configuration diagram of a PVC status table. , FIG.
FIG. 9 is a configuration diagram of a supervising group PVC mapping table, FIG. 9 is a configuration diagram of a small group PVC mapping table, and FIG. 10 is an operation explanatory diagram in the case of switching connection of PVC in supervision group units. ) Is a connection configuration diagram of the control group PVC before switching, and FIG.
(B) is a connection configuration diagram of the control group PVC after switching, and FIG. 11 is an operation flowchart in the case of switching connection of the PVC in the control group unit.
FIG. 11B is a flowchart of a release process of the supervisory group PVC, FIG. 11B is a flowchart of a connection process of the supervisory group PVC, and FIG.
FIG. 12 (a) is an explanatory diagram of the operation when switching connection is performed.
FIG. 12B is a connection configuration diagram of the small group PVC before switching, FIG. 12B is a connection configuration diagram of the small group PVC after switching, and FIG. 13 is an operation in the case of performing PVC switching connection in small group units. In the flowchart, FIG.
Is a flowchart of a release process of the small group PVC,
FIG. 13B is a flowchart of a small group PVC connection process, and FIG. 14 is an operation explanatory diagram in a case where the connection of the PVC is changed in the supervising group unit. FIG.
FIG. 1 is a connection configuration diagram of the control group PVC before the connection change.
FIG. 4B is a connection configuration diagram of the supervising group PVC after the connection is changed.

Referring to FIG. 1, an ATM communication network system 100 according to the present invention has a plurality of nodes 10 for processing ATM (Asynchronous Transfer Mode) cells and a network management device 50 for managing a network.

Referring to FIG. 2, node 10 has a plurality of ports P1, P2,... Which interface with other nodes.
, An alarm transmitting unit 24 and a PVC release connection processing unit 22
And a group table storage unit 12 and a state table storage unit 17.

The alarm transmitting unit 24 notifies the network management device 50 of the failure of the own node or the failure of the ports P1, P2,... Of the own node as failure information or recovery information that the failure has been recovered. I do.

The group table storage unit 12 stores a PVC group table 13.

As shown in FIG. 4, the PVC group table 13 includes a plurality of fixed virtual channels (PVC;
3 is a table for grouping into a small group formed by collecting an anent virtual channel and a supervising group formed by collecting and forming a plurality of the small groups. There are a plurality of supervision groups, and some of the small groups are independent small groups that do not belong to the supervision group but are independent. Each of the small groups and each of the supervising groups are assigned a group index to distinguish the groups. For example, each of the small groups has a small group index of A.
1, A2,..., And a supervising group index is given to each of the supervising groups as GA, GB,..., And an independent small group index is given to each of the independent subgroups, I1, I2,. ... is given.

The status table storage unit 17 stores an overall group PVC status table 18, a small group PVC status table 19, and a PVC status table 20.

The control group PVC status table 18
As shown in FIG. 5, a rewritable table representing a state in which a PVC connection is established in the control group unit as active and a state in which a PVC connection is released in the control group unit as inactive. is there.

The small group PVC status table 19, as shown in FIG. 6, expresses a state in which a PVC connection is established in small group units, and displays the PVC in small group units.
Is a rewritable table inactively indicating a state where the connection is released.

As shown in FIG. 7, the PVC status table 20 represents a state in which a PVC connection is established as active and a rewritable table representing a state in which the PVC connection is released as inactive. It is.

The PVC release connection processing unit 22 establishes a PVC connection in units of a supervising group or a small group in accordance with an instruction from the network management device 50.

Referring to FIG. 3, network management device 5
0 is the group PVC mapping table storage unit 51
, An alarm receiving unit 56, and a group determining unit 58.

The group PVC mapping table storage unit 51 stores an overall group PVC mapping table 52.
And a small group PVC mapping table 53.

Control group PVC mapping table 5
As shown in FIG. 8, reference numeral 2 is a table showing a relationship between a node name and a supervising group index for designating a supervising group used between nodes. For example, this table indicates that the controlling group GA
To use.

Small group PVC mapping table 53
FIG. 9 is a table showing a relationship between a port name and a small group index for designating a small group used between ports of a node, as shown in FIG. For example, this table shows that port P1 of node 1 and port P1 of node 2
In the interval between 1, the small group A1 is specified to be used.

The alarm receiving unit 56 receives the failure information or the recovery information from the node, and notifies the group determination unit 58 of the failure information or the recovery information.

The group deciding unit 58 includes the alarm receiving unit 5
When the notification of the trouble information or the recovery information from 6 is received,
The control group PVC mapping table 52 or the small group PVC mapping table 53 is searched to determine which group is to be switched to which group, and to issue an instruction based on the determination result to the node PVC release connection processing unit 22 of the node.
Send to

Next, the operation of the embodiment of the present invention will be described in detail with reference to the drawings.

The operation in the case where the PVC is switched and connected in the supervising group unit will be described in detail mainly with reference to FIGS. 10 and 11, with reference to FIGS.

Referring to FIG. 10A, the ATM communication network
In the network system 100, the node 10₁(No
Node 1) and node 10_Two(Node 2) is the supervising group in FIG.
Control group based on the loop PVC mapping table 52
A connection has been established with the PVC of the loop GA. At the port
In the figure, port P1 of node 1 and port P1 of node 2
Means the small group PVC mapping table 53 in FIG.
Is the PVC of the small group A1 based on
C_a11, PVC_a12, PVC_a13Are connected by
Port P2 and port P2 of node 2 are in small group A
PVC which is PVC of 2 _a21, PVC_a21, PVC_a23so
It is connected. Therefore, the controlling group PV shown in FIG.
In the C status table 18, the status of the control group GA
Is alive and the small group PVC condition table of FIG.
In Rule 19, the states of the small groups A1 and A2 are respectively
Active and in the PVC status table 20 of FIG.
And PVC _a11, PVC_a12, PVC_a13, PVC_a21, P
VC_a21, PVC_a23Are live.

In the ATM communication network system 100 in which the nodes 1 and 2 are connected and operating as described above, when the node 2 fails, the node 2 is disconnected and the switching connection to the node 3 is performed in units of the supervising group. P
The operation of the ATM communication network system 100 executed by the VC switching connection will be described.

Referring to FIG. 10A, FIG. 2 and FIG.
In the ATM communication network system 100, when the node 2 fails, the alarm transmission unit 24 of the node 2
Notifies the network management device 50 of node failure information indicating that the node 2 has failed.

The alarm receiving section 56 of the network management device 50 receives the node failure information from the alarm transmitting section 24 of the node 2 and notifies the group determining section 58 of the node failure information.

Upon receiving the node failure information and recognizing that the node 2 has failed, the group determining unit 58 searches the supervision group PVC mapping table 52 to find out which supervision group is to be switched. As a result of the search, the group determination unit 58 recognizes that the controlling group GA corresponding to the failed node 2 is to be switched, and instructs the switching of the node. Therefore, the controlling group release command instructing the release of the PVC of the controlling group GA. To the node 1.

The PVC release connection processing unit 22 of the node 1
From the group determination unit 58 of the network management device 50,
When the group release command is received, FIG.
According to the control group PVC release processing flowchart,
Target group from the group group PVC status table 18
Read the status of the group, here the controlling group GA
(Step S10), the status of the target supervising group
State, here the state of the controlling group GA, is alive
(Step S11), and the PVC
To the target supervising group with reference to the
Find all the small groups that belong to these small groups
State, here, the state of small groups A1 and A2 is inactive
(Step S12), and again the PVC glue
Referring to the table 13, these small groups A1,
Search for all PVCs belonging to A2 and check the status of these PVCs
The state is set to inactive (step S13).
VC _a11, PVC_a12, PVC_a13, PVC_a21, PVC
_a21, PVC_a23Set the state to inactive, and finally,
Status of the supervising group, here the supervising group G
The state of A is set to inactive (step S14), and the target
The release processing of the PVC of the supervising group to be ended. S
In step S11, the status of the target supervising group
If is already inactive, the process ends immediately. P
The VC release connection processing unit 22
State, that is, the state of the controlling group GA is inactive.
Is notified to the network management device 50.

When the group determining unit 58 of the network management device 50 receives from the PVC release connection processing unit 22 of the node 1 that the state of the control group GA is inactive,
With reference to the supervising group PVC mapping table 52, a new node candidate connected to the node 1 is searched. When determining the node 3 as a new node as a candidate, the group determining unit 58 refers to the control group PVC mapping table 52 and recognizes that the control group for connecting the nodes 1 and 3 is the control group GB. Then, a control group connection command for instructing connection of the PVC of the control group GB is transmitted to the node 1.

The PVC release connection processing unit 22 of the node 1
When the control group connection command is received from the group determination unit 58 of the network management device 50, the control group, which is the control group GB in this case, is controlled from the control group PVC status table 18 according to the control group PVC connection processing flowchart of FIG. , Is read out (step S20), and it is confirmed that the state of the supervising group GB is inactive (step S21), and
Refer to the PVC group table 13 and control group G
All small groups belonging to B are searched, and the state of these small groups is set to active (step S22).
The state of the small groups B1 and B2 belonging to the supervising group GB is set to active, and the PVC group table 1 is again set.
3, all PVCs belonging to these small groups
Is set, and the status of these PVCs is set to _active (step S23). In this case, PVC _b11 , PVC _b12 , PVC
_{b1 3,} the state of the PVC _b21, PVC _b21, PVC _b23 set to Katsusei, finally, the state of the dominating group GB is set to Katsusei (step S24), and terminates the PVC connection process of the dominating group GB. In step S21, if the status of the target supervising group is already active, the P
The VC connection processing ends.

When the PVC release connection processing unit 22 completes the PVC connection processing for each control group, in the ATM communication network system 100, as shown in FIG. 10B, the nodes 1 and 3 are connected to the control group GB. P
Connected by VC.

Next, when the failure of the node 2 is recovered, the alarm transmission unit 24 of the node 2 transmits node recovery information to the effect that the node 2 has been recovered to the network management device 50.

The alarm receiving unit 56 of the network management device 50 receives the node recovery information from the node 2, recognizes the recovery of the node 2, and notifies the group determining unit 58 of the recovery of the node 2.

When the group decision unit 58 recognizes that the node 2 has been recovered, the supervising group PVC mapping table 5
With reference to FIG. 2, in order to recognize that the control group currently used for connection between the node 1 and the node 3 is the control group GB and instruct the node to switch back, the PVC of the control group GB is instructed. The release command for instructing release is transmitted to the node 1.

The PVC release connection processing unit 22 of the node 1
When the control group release command is received from the group determination unit 58 of the network management device 50, the status of the control group GB is set to inactive according to the control group PVC release processing flowchart of FIG. 11A, and the device belongs to the control group GB. The state of all small groups is set to inactive, the state of all PVCs belonging to these small groups is set to inactive, and the network management is performed to indicate that the state of the control group GB is inactive. Notify the device 50.

When the group determining unit 58 of the network management device 50 receives the notification that the state of the control group GB is inactive and recognizes that the state of the control group GB is inactive, the group determination unit 58 recovers with the node 1. To reconnect with the node 2, a control group connection command for instructing connection of the PVC of the control group GA is transmitted to the node 1.

The PVC release connection processing unit 22 of the node 1
When the control group connection command is received from the group determination unit 58 of the network management device 50, the state of all the small groups belonging to the control group GA is set to active according to the control group PVC connection processing flowchart of FIG. All the PVCs belonging to these small groups are set to active, and finally, the state of the control group GA is set to active, and the PVC connection processing ends.

When the PVC release connection processing unit 22 of the node 1 completes the PVC connection processing for each control group, the AT
In the M communication network system 100, FIG.
As shown in (a), the node 1 and the node 2 are connected again by the PVC of the control group GA, and are switched back to the connection of the control group PVC before the failure.

Next, the operation of switching connection of PVC in small group units will be described in detail mainly with reference to FIGS. 12 and 13 and also with reference to FIGS.

Referring to FIG. 12 (a), in the ATM communication network system 100, the connection of the PVC between the nodes before the failure is the same as that of FIG. 10 (a). The port P1 of the node 1 and the port P1 of the node 2 are connected by the PVC of the GA, and the port P2 of the node 1 is connected by the PVC of the small group A1.
And the port P2 of the node 2 correspond to the PVC of the small group A2.
Connected by

In the ATM communication network system 100 connected and operating as described above, if the port P2 of the node 2 fails, the alarm transmission unit 24 of the node 2
Notifies the network management device 50 of port failure information indicating that the port P2 of the node 2 has failed.

The alarm receiving unit 56 of the network management device 50 receives the node fault information from the alarm transmitting unit 24 of the node 2 and notifies the port fault information to the group determining unit 58.

When receiving the port fault information and recognizing that the port P2 of the node 2 is faulty, the group determining unit 58 searches the small group PVC mapping table 53 to find out which small group is to be switched. As a result of the search, the group determination unit 58 recognizes that the small group A2 corresponding to the port P2 of the failed node 2 is to be switched, and instructs the switching of the port.
A small group release command instructing release of the second PVC is transmitted to the node 1.

The PVC release connection processing unit 22 of the node 1
When the small group release command is received from the group determination unit 58 of the network management device 50, the state of the target small group, here small, is determined from the small group PVC status table 19 according to the small group PVC release processing flowchart of FIG. The state of the group A2 is read (step S30), and it is confirmed that the state of the target small group, here, the state of the small group A2, is active (step S31), and the PVC group table 13 is referred to. To find all PVCs belonging to the target small group, and to check the status of these PVCs,
The states of C _a21 , PVC _a21 , PVC _a23 ,... Are set to inactive (step S32), and finally, the state of the target small group, here, the state of small group A2, is inactive. (Step S33), and terminates the PVC release processing. In step S31, if the state of the target small group is already inactive, the PVC release processing ends immediately. The PVC release connection processing unit 22 notifies the network management device 50 that the state of the target small group, that is, the small group A2 is inactive.

When the group determining unit 58 of the network management device 50 receives from the PVC release connection processing unit 22 of the node 1 that the state of the small group A2 is inactive, it refers to the small group PVC mapping table 53. Search for a new port candidate to be connected to the port P2 of the node 1. When the group determining unit 58 determines the port P1 of the node 3 as a new port as a candidate, the group determining unit 58 refers to the small group PVC mapping table 53 and
It recognizes that the small group for connecting the port 2 and the port P1 of the node 3 is the independent small group I1, and transmits to the node 1 a small group connection command instructing the connection processing of the independent small group I1.

The PVC release connection processing unit 22 of the node 1
When the small group connection command is received from the group determination unit 58 of the network management device 50, the state of the target small group, here independent, is determined from the small group PVC status table 19 according to the small group PVC connection processing flowchart of FIG. The state of the small group I1 is read out (step S40), it is confirmed that the state of the independent small group I1 is inactive (step S41), and it belongs to the independent small group I1 by referring to the PVC group table 13. All PVC states, here PV
The state of C _i11 , PVC _i12 , PVC _i13 ,... _Is set to _active (step S42).
The state of 1 is set to active (step S43), and the PVC connection process ends. In step S41, if the state of the target small group, here, the state of the independent small group I1, is already active, the PVC connection process is immediately terminated. At this time, the state of the supervising group GA is alive.

When the PVC release connection processing unit 22 of the node 1 completes the PVC connection processing in small group units, the ATM
In the communication network system 100, FIG.
As shown in (b), the port P1 of the node 1 and the node 2
Port P1 is a small group A in the controlling group GA
1 and connected to the port P2 of the node 1
And the port P1 of the node 3 are connected to the PV of the independent small group I1.
Connected with C.

Next, when the failure of the port P1 of the node 2 is recovered, the alarm transmitting unit 24 of the node 2 transmits port recovery information to the effect that the port P1 of the node 2 has been recovered to the network management device 50.

The alarm receiving unit 56 of the network management device 50 receives the port recovery information from the node 2, recognizes the recovery of the port P1 of the node 2, and determines that the port P1 of the node 2 has been recovered by the group determining unit 58. Notify to

When the group determining unit 58 recognizes that the port P1 of the node 2 has been restored, the group determining unit 58 refers to the small group PVC mapping table 53, and the port P2 of the node 1 is
In order to recognize that the small group used for connection between the port and the port P1 of the node 3 is the independent small group I1, and to instruct the switchback of the port, the small group I is used.
A small group release command instructing the release of the first PVC is transmitted to the node 1.

The PVC release connection processing unit 22 of the node 1
When the small group release command is received from the group determination unit 58 of the network management device 50, the state of the small group I1 is read from the small group PVC status table 19 according to the small group PVC release processing flowchart of FIG. 13A (step S30). It is confirmed that the state of the independent small group I1 is active (step S31).
Then, the state of all PVCs belonging to the independent small group I1, PVC _i21 , PVC _i21 , PVC _i23 ,... _Is set to inactive (step S32), and finally, the state of the independent small group I1 is inactive. Set to raw (step S33),
The PVC release processing ends. When the PVC release processing ends, the PVC of the independent small group I1 is released. The PVC release connection processing unit 22 notifies the network management device 50 that the state of the independent small group I1 is inactive.

When the group decision unit 58 of the network management device 50 receives the information that the state of the independent small group I1 is inactive, the small group A2 connects the port P2 of the node 1 and the port P2 of the node 2 again. Is transmitted to the node 1 instructing the connection of the PVC.

The PVC release connection processing unit 22 of the node 1
When the small group connection command is received from the group determination unit 58 of the network management device 50, the state of the small group A2 is read from the small group PVC state table 19 according to the small group PVC connection processing flowchart of FIG. 13B (step S40). It is confirmed that the state of the small group A2 is inactive (step S41), and the state of all the PVCs belonging to the small group A2 by referring to the PVC group table 13, here, PVC
The states of _a21 , _PVCa22 , _PVCa23 ,... are set to active (step S42), and finally, the state of the small group A2 is set to active (step S43), and the PVC connection process ends.

When the PVC release connection processing unit 22 of the node 1 completes the PVC connection processing in small group units, the ATM
In the communication network system 100, FIG.
As shown in (a), the port P2 of the node 1 and the node 2
Port P2 is again connected with the PVC of the small group A2, and is switched back to the connection of the control group PVC before the failure.

Next, in the ATM communication network system 100 in which the nodes 1 and 2 are connected and operating, if the node 2 fails, the connection between the nodes 1 and 2 is abandoned and the nodes 3 and 4 are newly added. That connects to the ATM by connecting PVCs at the supervision group level
The operation of the communication network system 100 will be described.

Referring to FIG. 14 (a), when node 2 fails in ATM communication network system 100, alarm transmitting section 24 of node 2 transmits node failure information indicating that node 2 has failed to the network. Notify the management device 50.

The network management device 50 receives the node failure information, and transmits to the node 1 a general group release command for releasing the PVC of the general group GA.
The node 1 releases the connection of the PVC of the controlling group GA according to the controlling group PVC release processing flowchart of FIG. As a result, the connection between the nodes 1 and 2 is disconnected.

Next, the group decision unit 58 of the network management device 50 refers to the supervising group PVC mapping table 52 to search for new nodes 3 and 4 in place of the nodes 1 and 2, and Recognizing that the control group for connection 4 is the control group GC, it transmits a control group connection command instructing the connection processing of the control group GC to the node 3.

The PVC release connection processing unit 22 of the node 3
According to the flowchart of the control group PVC connection process of FIG. 11B, the process of connecting the PVC of the control group GC is performed. As a result, instead of the connection between node 1 and node 2, node 3 and node 4 are newly
Are connected by PVC.

As described above, according to the present invention, it is possible to construct several independent networks in the ATM communication network system 100.

[0071]

As described above, the present invention manages a plurality of PVCs to be switched as a group,
Since the network management apparatus automatically issues an instruction to release the PVC and connect the PVC to the group, it is possible to quickly switch and connect a large number of PVCs.

In the present invention, the switching connection between the nodes is performed in a two-stage manner, in which the nodes are switched and connected in the unit of a general group, and the ports of the nodes are switched and connected in the unit of a small group. Switching connection is possible even if the group is designated, and the PVC connection can be changed for various uses.

Furthermore, according to the present invention, it is possible to select whether to switch and connect in units of a supervising group or in units of small groups according to the degree of node failure. Switching connection becomes possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an ATM communication network system of the present invention.

FIG. 2 is a configuration block diagram of a node according to the present invention.

FIG. 3 is a configuration block diagram of a network management device of the present invention.

FIG. 4 is a configuration diagram of a PVC group table.

FIG. 5 is a configuration diagram of a supervisory group PVC status table.

FIG. 6 is a configuration diagram of a small group PVC status table.

FIG. 7 is a configuration diagram of a PVC status table.

FIG. 8 is a configuration diagram of a supervisory group PVC mapping table.

FIG. 9 is a configuration diagram of a small group PVC mapping table.

FIG. 10 is an explanatory diagram of an operation in a case where a PVC is switched and connected in an integrated group unit.

FIG. 11 is an operation flowchart in a case where a PVC is switched and connected in an integrated group unit.

FIG. 12 is an explanatory diagram of an operation in the case of switching connection of PVC in small group units.

FIG. 13 is an operation flowchart in the case of performing PVC switching connection in small group units.

FIG. 14 is an explanatory diagram of an operation in a case where a connection of a PVC is changed in a unit of a supervisory group.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 ATM communication network system 10 node 12 group table storage unit 17 state table storage unit 22 PVC release connection processing unit 24 alarm transmission unit 50 network management device 51 group PVC mapping table storage unit 52 supervising group PVC mapping table 53 small group PVC mapping table 56 Alarm receiving unit 58 Group determining unit

Claims (6)

[Claims] A plurality of fixed virtual channels (PVC; Per)
fixed virtual channel group means for grouping the plurality of fixed virtual channels into a small group formed by collecting a plurality of virtual groups (manual virtual channels) and a plurality of control groups formed by collecting and forming a plurality of the small groups; An ATM communication network system comprising: a small group fixed virtual channel connection means for establishing a fixed virtual channel connection; and a general group fixed virtual channel connection means for establishing a fixed virtual channel connection for each general group. 2. An ATM having a plurality of nodes for processing ATM cells having a plurality of ports for interfacing with the outside, and a network management device for managing a network.
In a communication network system, according to an instruction of the network management device, the general group fixed virtual channel connection means connects a fixed virtual channel between the nodes in a general group unit, and the small group fixed virtual channel connection means 2. A fixed virtual channel connection between ports in small group units.
An ATM communication network system as described. 3. An ATM having a plurality of nodes having a plurality of ports for interfacing with the outside and processing ATM cells, and a network management device for managing a network.
In the communication network system, the network management device includes a node switching instruction for instructing switching or change of connection between nodes and a node switching instruction for instructing to return connection between nodes to a connection before switching or before switching. A node switchover instructing unit that is generated; releases a fixed virtual channel connection between nodes that have already been established in a unit of a control group according to the node switchover instruction from the node switchback instructing unit; Control virtual channel switching connection means for establishing a fixed virtual channel connection between the control group units in a control group unit; in response to the node switching instruction from the node switching switching instruction means, the control group fixed virtual channel switching connection means Controls the fixed virtual channel connection between nodes for which a switching connection has already been established. 3. An integrated group fixed virtual channel return connection means for releasing in a group unit and re-establishing a fixed virtual channel connection between nodes before switching or before change in an integrated group unit. An ATM communication network system as described. 4. An ATM having a plurality of nodes for processing ATM cells having a plurality of ports for interfacing with the outside, and a network management device for managing a network.
In the communication network system, the network management device includes a port switching instruction for switching or changing the connection between the ports of the node and a port disconnecting instruction for returning the connection between the ports of the node to the connection before the switching or the change. And a port switching / return instructing means for generating a return instruction; releasing the fixed virtual channel connection between the already established ports in small group units by the port switching instruction from the port switching / return instructing means. Having a small group fixed virtual channel switching connection means for establishing a fixed virtual channel connection between new ports in small group units;
In response to the port switching instruction from the port switching switching instruction unit, the fixed virtual channel connection between ports for which switching connection has already been established by the small group fixed virtual channel switching connecting unit is released in units of small groups, and switching is performed. 2. A small group fixed virtual channel return connection means for re-establishing a fixed virtual channel connection between ports before or before change in small group units.
Alternatively, the ATM communication network system according to 2. 5. The node has node alarm transmission means for notifying the network management device of node failure information indicating that the node has failed and node recovery information indicating that the failure of the node has been restored; The network management device includes: a mapping table storage unit that stores a general group fixed virtual channel mapping table that specifies a general group corresponding to the connection between nodes; and node failure information or node recovery information from the node alarm transmitting unit. A node switching instruction for searching and searching the heading group fixed virtual channel mapping table to determine which heading group is to be switched to which heading group, or a node switchback for determining and instructing which heading group is to be switched back to which heading group. Switchover of node switching that generates an instruction Instructing means; the controlling group fixed virtual channel switching connecting means releases the fixed virtual channel connection between the established nodes in the controlling group unit according to the node switching instruction from the node switching switching instruction means. A fixed virtual channel connection between new nodes is established in a unit of a control group, and a fixed virtual channel connection between nodes for which a switching connection has already been established is established by the node switching instruction from the node switching switching instruction means. 4. The ATM communication network system according to claim 1, wherein said ATM communication network system is released in units of a control group, and a fixed virtual channel connection between nodes before switching or before change is re-established in units of a control group. 6. The node has port alarm transmission means for notifying the network management device of port failure information indicating that the port of the node is in failure and port recovery information indicating that the failure of the port has been recovered. The network management device includes a mapping table storage unit that stores a small group fixed virtual channel mapping table that specifies a small group corresponding to the connection between ports, and port failure information or port recovery information from the node alarm transmission unit. A port switching instruction for searching and searching the small group fixed virtual channel mapping table to determine which small group is to be switched to which small group, or a port switching instruction for determining and indicating which small group is to be switched back to which small group. Port switching failback instruction that generates return instruction The small group fixed virtual channel switching connection means releases the fixed virtual channel connection between the ports of the already established nodes in small group units according to the port switching instruction from the port switching switching instruction means. Then, a fixed virtual channel connection between the ports of the new node is established in small group units, and the port switchover instruction from the port switchover instruction instructs the port switchover between the ports of the nodes for which the switching connection has already been established. 5. The ATM according to claim 1, wherein the fixed virtual channel connection is released in small group units, and the fixed virtual channel connection between the ports of the nodes before switching or before change is re-established in small group units. Communication network system.