JP2000354050A - Atm network management system and method for controlling automatic disconnection of pvc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce line capacity of an ATM network by making a long way only around a high priority PVC(permanent virtual channel), when a line fault occurs on the network. SOLUTION: In a method for controlling automatic disconnection of PVC, the states of each of ATM nodes 2 is monitored, and when a fault is detected in one ATM node 2, a network management device 1 actuate a PVC disconnection control shell 13 by taking this opportunity, reads out a relevant SG file based on the node name and port number of a received trap, and executes disconnection of a relevant low priority PVC. In addition, the management device 1 connects the low priority PVC to another disconnected junction circuit by taking a detour around the high priority PVC of the junction circuit in which the fault occurred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION ATM (Asynchronous Transf)
ATM) In a network of nodes, an ATM that enables efficient circuit design by giving priority to PVC (Permanent Virtual Channel), which is highly important in the event of a circuit failure,
The present invention relates to a network management system and a PVC automatic disconnection control method.

[0002]

2. Description of the Related Art When constructing a network in an ATM node, there are cases in which two routes are provided between ATM nodes in consideration of security at the time of a line failure. At this time, if a failure occurs on one of the routes, the PV set on that route is
C detours to the other route. However, if the line capacity of the detour route is insufficient, a PVC that cannot be connected occurs.

[0003]

However, if all PVCs are rescued at the time of detour, the circuit capacity becomes large at the time of network design, which is uneconomical.

Accordingly, the present invention reduces the line capacity by disconnecting a low-priority PVC on a detour relay line and detouring only a high-priority PVC when a line failure occurs on a network. An object of the present invention is to provide a possible ATM network management system and a PVC automatic disconnection control method.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a data storage means in which ATM nodes are stored in a manner corresponding to PVC priorities in a network in which each ATM node is connected by a trunk line; Trap receiving means for receiving a failure detection trap from the node and instructing the PVC disconnection control means to start, and receiving this start instruction,
Based on the data in the data storage means, the other non-failed relay circuit executes disconnection processing of the low-priority PVC, and transmits the failed relay to the other relay circuit that disconnected the low-priority PVC. PVC disconnection control means for bypassing and connecting a high priority PVC of the circuit.

[0006] The apparatus further comprises an end trap issuing means for issuing an end trap after the PVC disconnection and connection processing is completed.

With the above configuration, when a line failure occurs on the network, a low-priority PVC is cut off on a detour relay circuit, and only a high-priority PVC of the faulty relay circuit is detour-connected. , ATM node can recognize the completion of the reconnection.

[0008]

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

FIG. 1 shows the configuration of an ATM network management system according to the present invention. An ATM node is constructed by three nodes A, B and C, and each node is connected by a relay line to form a triangle. Type network.

FIG. 1A shows a communication pattern at the time of normal operation, in which there is communication between each node, and a circle indicates a breakdown of the line capacity of each relay line. FIG. 1B shows a node A-
The line connection when a failure occurs in the relay line between the nodes C is shown.

Next, the operation of this embodiment will be described with reference to FIG.

At the time of normal operation shown in FIG. 1A, the line capacity of each relay line is set to a high priority PVC band (this is called a PVC band).
1, 2, 4, 5, 7, 8) and low priority PVC
The bandwidth is filled with the bandwidth (to be PVC 3, 6, 9) and the free capacity bandwidth. PVC between node A and node B
1, 2 and 3 and the rest are free space. A-Node B
-Between nodes C, PVCs 7, 8 and 9 and the rest are free space. Between nodes A and C, PVCs 4, 5, and 6 have free space.

When a fault occurs in the relay line between node A and node C shown in FIG. 1B, the PVCs 4, 5, and 6 extended between the nodes are replaced with the relay line between node A, node B, and node C. Try to make a detour.

However, since it is impossible to rescue all PVCs due to free space, all PVCs with high priority are rescued by cutting PVCs with low priority. The network management unit receives a trap issued from a node when a line failure is detected at the relay line ports of the nodes A and C, and defines the trap in advance in response to the trap reception at the time of the trunk line failure. The low priority PVCs 3, 6, and 9 are disconnected based on the set SG data.

As a result, the free capacity band generated between node A and node B and between node B and node C
-PVCs 4, 5 which are high-priority PVCs between nodes C
Can be extended.

FIG. 2 shows the flow of processing in the network management device and the ATM node. In the network management device 1, the monitoring unit 11 always controls each ATM.
The status of the node 2 is monitored. By detecting a failure in the ATM node 2, in the network management device 1, the trap receiving unit 12 receives the failure trap. Upon receiving the failure trap, the network management device 1
A C disconnection control shell (PVC disconnection control means) 13 is started and its routine is executed. The data storage unit 14 stores the priorities corresponding to the respective PVCs, and the PVC disconnection control shell 13 reads out the corresponding SG file based on the node name and port number of the received trap. If the corresponding SG file does not exist, the process ends. The PVC disconnection control shell 13 executes the disconnection processing of the corresponding low-priority PVC based on the SG data, and gives the other relay circuits that have disconnected the low-priority PVCs the priority of the failed relay circuit. To bypass the high PVC. The PVC disconnection control shell 13 issues an end trap after the PVC disconnection / connection process is completed. This allows AT
The M node 2 recognizes that the reconnection has been completed, and can resume communication.

According to the above-described processing, when a network is constructed by an ATM node, a high-priority PVC set on a failed line at the time of a detour at the time of a line failure is preferentially rescued. Efficient line design becomes possible.

When a relay line failure occurs in a network constructed by ATM nodes, the ATM network management system receives a trap from the ATM node that has detected the line down and triggers an SG defined for each node name and port number. Based on the data, a PVC disconnection process is automatically performed according to the priority.

The disconnection / connection processing of PVC is realized by a UNIX shell on the ATM network management system. Therefore, it can be realized by changing the program on the UNIX system without adding new hardware.

With this function, a low-priority PVC on the network can be disconnected at the time of failure, so that at the time of network design, it can be constructed with a circuit capacity that is the original PVC that should pass through the route plus a high-priority PVC at the time of detour. The line capacity can be reduced.

[0021]

As described above, according to the present invention, when a network is constructed, a priority is set according to the necessity of bypassing a PVC, and when a line failure occurs on a network, a PVC having a low priority is disconnected. By designing the network so that only high priority PVCs are bypassed, it is possible to reduce the trunk line capacity and reduce the line charge.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an ATM network management system according to the present invention, in which (a) shows a line connection at the time of normal operation, and (b) shows a line connection at the time of occurrence of a fault.

FIG. 2 is a diagram showing a flow of processing in a network management device and an ATM node.

[Explanation of symbols]

 Reference Signs List 1 network management device 2 ATM node 11 monitoring unit 12 trap receiving unit 13 PVC disconnection control shell 14 data storage unit

Claims (6)

[Claims] In a network in which ATM nodes are connected by a trunk line, a data storage means storing a PVC in correspondence with a priority and a failure detection trap from each ATM node are received.
Trap receiving means for instructing the VC disconnection control means to start, and receiving this start instruction, based on the data in the data storage means, a PVC having a lower priority in another non-failed relay circuit.
An ATM network management system, comprising: PVC disconnection control means for executing a disconnection process. 2. The method according to claim 1, wherein said PVC disconnection control means connects to another relay circuit that has disconnected said low-priority PVC, bypassing a high-priority PVC of said failed relay circuit. The ATM network management system according to claim 1. 3. The ATM network management system according to claim 2, further comprising an end trap issuing means for issuing an end trap after PVC disconnection and connection processing is completed. 4. The ATM network management system according to claim 1, wherein said PVC disconnection control means is a UNIX shell. 5. In a network in which ATM nodes are connected by trunk lines, data is stored in correspondence with PVCs, and a failure detection trap is received from each ATM node.
A PVC automatic disconnection control method, in which a VC disconnection control routine is instructed to start, and in response to the activation instruction, a low priority PVC disconnection process is executed by another non-failed relay circuit based on the data. 6. A high-priority PV of a faulty relay circuit is provided to another relay circuit that has disconnected the low-priority PVC.
The PVC automatic disconnection control method according to claim 5, wherein the connection is made by bypassing C.