JPH11177562A - Communication network control method - Google Patents

Abstract

(57) Abstract: The present invention relates to a communication network control system, and aims to enable high-speed END-TO-END path setting when a communication network is divided into layer networks and configured. . SOLUTION: Each layer network collects network information from a system 1 in a network domain (function 2), and creates the layer network based on the collected network information and connectability information from a lower layer (function 3). ), Explore connectivity between access points in the created layer, create connectivity information,
It notifies the upper layer network (function 4) and generates virtual objects as connectability information between access points of the created layer based on the collected connectability information (function 5). A communication path in the layer network is set based on the generated virtual object (function 6).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication network control system, and more particularly to a control system for setting an END-TO-END communication path when a communication network is divided into layer networks. FIG. 12 is a configuration example of a communication network. The communication network is shown in FIG.
As shown in, multiple domains (DOMAIN-A,
Synchronous Digital Hierarchy (SDH) to interconnect B, C, D,.
y), asynchronous digital hierarchy (PDH: Presynchro
nous Digital Hierarchy), Asynchronous Transfer Mode (ATM: A
synchronous transfer mode) and various cross-connect devices with different transfer speeds (PDH-2MXC,
PDH-45MXC, SDH-52MXC, SDH-156
MXC) and a multiplexer / demultiplexer (MUX / DMUX). The operating system (OpS) of the communication network includes a main operating system (Main-OpS) that manages and controls communication procedures and the like of the entire communication network, and a sub-system that manages and controls communication procedures and the like for each domain (DOMAIN). Operating system Sub-
OpS (Sub-OpS-A, B, C, D...) Are connected in parallel. In such a communication network, EN
The D-TO-END communication path setting is based on the Sub-
OpS is realized by controlling the plurality of cross-connect devices under the direction of Main-OpS.

[0002]

2. Description of the Related Art By the way, in order to consider a complicated communication network as shown in FIG. 12, the concept of a sub-network is introduced, and for example, a network is formed by using a layering (hierarchical structure) relationship as shown in FIG. The movement to organize the structure is described in ITU-T Recommendation G. 805.

FIG. 13 shows a configuration example of a layer network included in the communication network shown in FIG. FIG.
As shown in (1), the domain (DOMAIN) -A and the domain (DOMAIN) -D have sub-networks of PDH-2M, respectively. The domain (DO
MAIN) -B includes PDH-45M and PDH-100
There are M sub-networks each. Domain (DOMAIN) -C has SDH-52M and SDH-1
There are 56M sub-networks each. Then, the domain (DOMAIN) -A and the domain (DOM)
AIN) -D are connected via a domain (DOMAIN) -B and a domain (DOMAIN) -C, respectively.

That is, the communication network shown in FIG. 12 includes a PDH-2M layer, a PDH-45M layer,
H-100M layer, SDH52M layer, SDH-1
In the PDH-45M layer, a domain (DOMAIN) -A and a domain (DOMAI) exist.
N) -D and domain (DOMAIN) -B are connected.

Accordingly, a layer network as shown in FIG. 13 is obtained. In FIG. 13, the PDH-100M layer and the SDH-156M layer are not shown,
Each subnetwork contains access groups (a
ccess group), access point (access point), LT
A P (Link Termination Point) is provided. Then, the LTP of the subnetwork of each layer and an access point (access point) are connected by an adaptation (layer conversion unit) R.

In FIG. 13, LTP-a in domain-A of the PDH-2M layer and LTP-a in domain-D
d, a path via the PDH-45M layer and a domain of the PDH-45M layer
A subnetwork, SDH-52M layer, PDH-
It is shown that there is a 45M layer domain-path via the D subnetwork.

[0007]

[Problems to be Solved by the Invention] ITU-T Recommendation G. 8
In the layer network based on P.05, the path between two sub-networks in the PDH-2M layer is a lower layer network (P
DH-45M layer, SDH52M layer) path is E
It is not generated until it is set to ND-TO-END.

Therefore, in the upper layer network (PDH-2M layer), the cross-connect devices (PDH-45MXC, SDH) of the lower layer network (PDH-45M layer, SDH52M layer)
H-52MXC), the LTP-a of the domain-A becomes the LTP-a of the domain-D.
It is unknown which of TP-c and LTP-d can be connected.

That is, when an END-TO-END path is set, the layer in which the path setting request is issued inquires of the lower layer network management device for each sub-network relay point (LTP) as to whether or not connection is possible. A procedure for searching for connection availability in the lower layer is required.

Specifically, in the example of FIG. 13, PDH
-When a path setting request occurs in the 2M layer,
When the PDH-2M layer issues a route search request to the PDH-45M layer, the PDH-45M layer issues a route search request to a lower SDH-52M layer. Then, from the SDH-52M layer to the PDH-45M
When a response is returned to the layer, a response is returned from the PDH-45M layer to the PDH-2M layer.

The PDH-2M layer confirms a response to the route search request and issues a route setting request to the PDH-45M layer. Then, the PDH-45M layer issues a route setting request to the lower SDH-52M layer. Then, from the SDH-52M layer to the PDH-45
When a response is returned to the M layer, a response is returned from the PDH-45M layer to the PDH-2M layer. Thereby, PD
In the H-2M layer, the EN between LTP-a and LTP-d
It can be seen that the D-TO-END path has been set. In such a path setting procedure, there is a problem that it takes time to set a path.

According to the present invention, when a communication network is managed as a layer network, connectability information is provided for each layer, thereby enabling high-speed END-T.
It is an object of the present invention to provide a communication network control method that enables O-END path setting.

[0013]

FIG. 1 is a block diagram showing the principle of the first to fifth aspects of the present invention.

According to the first aspect of the present invention, the communication network is managed by dividing it into networks having a layer structure created based on network information collected from the operating system 1 of each network domain, and in each layer network, END-TO- A communication network control method for setting an END path, wherein each layer network has at least a layer network information collection function 2 for collecting network information from an operating system 1 of a network domain, a collected network information and a lower layer network If there is a layer network creation function 3 for creating the layer network based on the connectability information collected from the lower layer network, and a layer network creation function 3 if there is an upper layer network. A connectable point search function 4 for searching for connectability between access points of the layer network, generating connectability information, and notifying the layer network of the access points, and connectability information between the created access points of the layer network A virtual object generation function 5 for generating a virtual object link based on the connectability information collected from the lower layer network,
A path setting function for setting a communication path in the layer network based on the virtual object link generated in response to the path setting request.

That is, according to the first aspect of the present invention, when the layer network information collecting function 2 collects network information (type of transmission speed, distinction between synchronous network and asynchronous network, etc.) from the operating system 1 in the network domain. Sends a layer network creation request to the layer network creation function 3. In response to the creation request, the layer network creation function 3 creates the layer network based on the network information and the connectivity information collected from the lower layer network when there is a lower layer network.

The connectability information from the lower layer may be directly collected by the layer network information collection function 2 and provided to the layer network creation function 3 together with the network information.
However, the information may be collected through the layer network information collection function 2. Then, the virtual object generation function 5
Generates a virtual object link as the created connectivity information between the access points of the layer network based on the connectivity information collected from the lower layer network.

That is, a layer network having a function of generating a virtual object has a lower layer network. In this lower layer network as well, the layer network creation function 3 similarly creates a layer network and establishes a connectable point. The search function 4 searches for a connection possibility between the access points of the created layer network, generates connection possibility information, and notifies the higher layer network of the connection possibility information.

As described above, when the communication network is divided into networks having a layer structure created based on the network information collected from the operating system 1 of each network domain and managed, the present invention employs each layer network (more precisely, (Excluding the lowest layer network), a virtual object link is set as connectability information.

Therefore, when an END-TO-END path setting request is made, the path setting function 6 does not send a special route search request to a lower layer network, but sends a special path search request to each lower layer network. The END-TO-END path setting can be performed only by setting the communication path in the layer network based on the virtual object link generated by the virtual object generating function 5. In other words, since the route search procedure could be omitted, END
-Path setting of TO-END can be performed quickly.

According to a second aspect of the present invention, in the communication network control method according to the first aspect, when a change occurs in the layer network, the layer network creation function 3 detects a change in the layer network. The virtual object generation function 5 updates the generated virtual object link by reconfiguring the layer network by using the virtual network.

That is, according to the invention described in claim 2, when a change occurs in the layer network, the layer network creation function 3 reconfigures the layer network,
As a result, a search for a connectable point is performed and notified to an upper layer, so that a new virtual object link is generated in the upper layer. That is, when a change occurs in the layer network, the contents of the change can be notified to an upper layer, so that the network can be reliably managed and operated.

According to a third aspect of the present invention, there is provided a communication network control system according to the first or second aspect,
The connectable point search function 4 searches for connectability information again when the searched connectability information is used for path setting, and the virtual object generation function 5 determines whether the generated virtual object link is an actual link. When used as, a virtual object link is generated again.

That is, according to the third aspect of the present invention, when the searched connectability information is used for path setting, the connectability information is searched again, and a virtual object link is generated. Therefore, it is possible to smoothly cope with a case where a plurality of path setting requests are made. According to a fourth aspect of the present invention, in the communication network control method according to any one of the first to third aspects, a connectable point search function 4
When searching for connectivity between access points of the created layer network, if a failure, quality deterioration, etc. is detected, it is necessary to generate connectivity information in which state information of the detected location is updated. Features.

That is, according to the fourth aspect of the present invention, a failure,
When a failure such as quality deterioration occurs, connectability information in which the state information of the failure location is updated is generated. Therefore, when a failure occurs, it is possible to set a path avoiding the failure location. According to a fifth aspect of the present invention, in the communication network control method according to any one of the first to fourth aspects, the virtual object link as the connectability information includes band information. And

That is, according to the fifth aspect of the present invention, when the transmission path is an ATM network, band information can be included, so that path setting is facilitated.

[0026]

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

FIG. 2 shows an example of the configuration of an operating system (OpS) according to the first to fifth aspects of the present invention. In this embodiment, the layer network is assumed to be composed of two layer networks, a PDH2M layer and a PDH45M layer, for the sake of simplicity.
Operating system of communication network (OpS)
As shown in FIG. 12, a Main-OpS 10 and a plurality of Sub-OpSs 11 (DOMAIN-A, B,
C, D...). And Main-OpS10 and each S
The ub-OpS 11, as shown in FIG. 2, is a relationship between a manager and an agent, and sends and receives commands and data to and from each other via a communication line.

More specifically, the Main-OpS 10 includes each Sub-OpS
A path setting command can be issued to control the cross-connect device, etc., and network configuration information from each Sub-OpS 11 {layerNetworkDomain, subNetwork, accessGrou
Control to read｝, LTP, etc. can be performed. In addition, each Sub-OpS
11 can notify the Main-OpS 10 of the change in response to the change in the network configuration information.

Main-OpS 10 is a layer network (P
A path management control 12 and a layer management 13 are provided for each of the DH2M layer and the PDH45M layer. Path management control 12
Are a connectable point search function 12a, a layer network creation function 12b, and a layer network information collection function 1
2c and a path setting function 12c. Further, the layer management 13 is composed of managed objects that manage information to be managed (for example, network configuration information) collected from each Sub-OpS 11. FIG. 2 shows an example of a management target object in the PDH2M layer. These have the following contents:

(1) LayerNetworkDomain—Object class for layer network management Attribute name: LayerNetworkDomainId (LNI) Attribute name: CharacteristicInformation (PDH 2M) (2) subNetwork: Object class for subnetwork management Attribute name: SNId (SN1) Attribute name: LTPList (LTP-a, LTP-b, ...) (3) Trail ... END-TO-END Object class for path management Attribute name: TrailId (pathX-Y) attribute Name: directionality (bi-directionality) Attribute name: a-TP (X) Attribute name: z-TP (Y) (4) LTP ・ ・ ・ Object class for LTP management Attribute name: LTPId (LTP-a) ( 5) accessGroup... Object class for accessGroup management Attribute name: accessGroupId (ag-X) FIG. 3 shows the configuration and relationship of each layer in the embodiment corresponding to claims 1 to 5. In FIG. 3, an upper layer (PDH2M layer) and a lower layer (PDH45M layer) respectively include a layer network information collection function (1) (11), a layer network creation function (2) (12),
Connectable point search function (3) (13) and path setting function (4) (14)
And databases (5) and (15).

Layer network information collection function (1) (11)
Collects the layer network information of its own domain (data rate type, whether it is a synchronous network or an asynchronous network, etc.) from the databases (5) and (15), and collects the layer network information of other domains from outside, A layer network creation request is output to the network creation functions (2) and (12) together with the layer network information.

The layer network information collection function (1) of the lower layer outputs a layer network creation request to the layer network creation function (2) even when an external network change notification is input. On the other hand, the layer network information collection function (11) of the upper layer collects the connectability information from the connectable point search function (3) of the lower layer and provides it to the layer network creation function (12) of the layer network creation function.

The layer network creation functions (2) and (12)
The layer network is created based on the layer network information obtained in response to the creation request, stored in the database (5) (15), and a route search request is made to the connectable point search function (3) (13). . During this time, the layer network creation functions (2) and (12) perform the path setting functions (4) and (1) so that the path setting functions (4) and (14) do not access the databases (5) and (15).
Send a network configuration change notification to 4).

The connectable point search functions (3) and (13) receive the route search request, retrieve the created layer network from the databases (5) and (15), and search for connectability between access points. , Generate connectability information. The lower layer connectable point search function (3) uses the upper layer layer network information collection function
Send to (11). Layer network creation function (12)
A virtual object link is generated from the connectability information obtained from the lower layer via the layer network information collection function (11) and stored in the database (15).

In response to the path setting request, the path setting functions (4) and (14) perform path setting based on the created virtual object link of the layer network, and notify the completion of the setting to the layer network generating functions (2) and (12). ) To give. The lower layer path setting function (4) also sends the path setting end to the upper layer path setting function (14).

The correspondence between the above configuration and the claims is as follows. Operating system 1 includes:
Databases (5) and (15) correspond. The layer network information collection function 2 includes a layer network information collection function.
(1) and (11) correspond. Layer network creation function 3,
The layer object creation functions (2) and (12) correspond to the virtual object creation function 5. The connectable point search function 4 corresponds to the connectable point search functions (3) and (13). The path setting function 6 corresponds to the path setting functions (4) and (14).

[Embodiment Corresponding to Claim 1] FIG.
2 is a configuration example of a layer network according to the embodiment corresponding to claim 1. This layer network includes the PDH2M layer and the PDH45M layer as described above. In FIG. 4, SN is a subnetwork (Sub Net).
work). The PDH2M layer includes SN-1 and S
It has two sub-networks, N-2. SN-1 and SN-2 each have an access group (X, Z), and a virtual link (Vir
tual Link-1, 2) is set.

In the PDH45M layer, SN-
Four sub-networks A, SN-B, SN-C, and SN-D are shown. The SN-D includes access points (AP-B, AP-C). Also, in SN-A,
There is an access point (AP-A). In SN-C,
There is an access point (AP-D). SN-A and SN
-C is connected via SN-B and SN-A
And SN-C, a virtual link (Virtual
Link) is set.

In the above configuration, the creation of the layer network information and the path setting are performed as follows. (Creation of Layer Network Information) FIG. 5 shows a network information collection sequence according to the first embodiment. Creation of the layer network information is performed when the system is started. 3 to 5, PD
Layer network information collection function for H45M layer
(1) is the Sub-OpS (Sub-OpS-A, Sub-OpS-B,
-OpS-C, Sub-OpS-D), collects the above-mentioned managed objects relating to the PDH45M layer network (layer network information collection), and gives it to the layer network creation function (2) (layer network creation request). Store in database (5).

The layer network creation function (2) performs one PDH 45 from the collected information of the management target object.
Create an M-layer network. At this time, the layer network creation function (2) sends a layer network configuration change notification (DB-locked) to the path setting function (4) during creation of the layer network, and the path setting function (4) ) To prevent access.

Then, a layer network creation function (2)
When the creation of the layer network is completed, it stores it in the database (5) and requests the connectable point search function (3) for a route search. Further, the layer network creation function (2) sends a layer network configuration change end notification (DB-unlocked) to the path setting function (4), so that the path setting function (4) can access the database (5). .

The connectable point search function (3) is a database
From (5), the created PDH45M layer network is extracted, and a search is made to determine which access point can be connected. In FIG. 4, AP-A of the access point,
Connection is possible between AP-D and between AP-B and AP-C.
Therefore, the connectable point search function (3) provides the following connectability information connectability information to the layer network information collection function (11) of the PDH2M layer: (AP-A, AP-D), (AP-B ,
AP-C).

Next, in the PDH2M layer, the layer network information collecting function (11) receives the notification of the connectability information from the lower layer and receives the Sub-OpS (S
ub-OpS-A, Sub-OpS-B, Sub-OpS-C, Sub-OpS-D) to PDH
The above-mentioned managed objects relating to the 2M layer network are collected (layer network information collection) and given to the layer network creation function (12) together with the connectability information obtained from the lower layer (layer network creation request), and the database ( Store in 15).

The layer network information collection function (1
1) is AP-A → LTP-a, AP-B → LTP-b,
Conversion between layers is performed as in AP-C → LTP-c, AP-D → LTP-d, the information is notified to the layer network creation function (12), and stored in the database (15). The layer network creation function (12) generates a PDH2M layer network based on the layer network information acquired from the layer network information collection function (11), and connects the PDH45M layer acquired via the layer network information collection function (11). The possible point information is deployed on the layer network created as described above.
Thus, in the present example, two sub-networks SN
LTP-a and LTP-d, LTP- between -1 and SN-2
It turns out that it is possible to connect with b by LTP-c.

Therefore, a layer network creation function (12)
Is connected to the subNetwork class
List) attribute is newly provided, and the attribute is registered. Also, LTP-a and LTP-d, LTP-b and LTP-c
Virtual link object (Vi
rtualLink-1,2) is generated and managed. Note that the layer network creation function (12) provides “DB-locked”, “DB-u” to the path setting function (14) as in the case of the PDH45M layer.
"nlocked" to manage the database (15).

As described above, in the PDH2M layer, layer network information is created, and an SN1 connection possibility table and an SN2 connection possibility table are respectively set as shown in FIG. Is as follows. (1) SN1 object subNetwork attribute name: SNId (SN1) attribute name: LTPList (LTP-a, LTP-b, ...) attribute name: connectivityList (LTP-a, LTP-d) (LTP-b, LTP-c ) (2) SN2 object subNetwork attribute name: SNId (SN2) attribute name: LTPList (LTP-c, LTP -d, ··) attribute name: connectivityList (LTP-d, LTP -a) (LTP-c, LTP- b) (3) VirtualLink1 object Attribute name: VirtualLinkId (Link-1) Attribute name: A-TP (LTP-a) Attribute name: Z-TP (LTP-d) (4) VirtualLink2 object Attribute name: VirtualLinkId (Link- 2) Attribute name: A-TP (LTP-b) Attribute name: Z-TP (LTP-c) If there is a lower layer network in the PDH45M layer, layer network information is also created in the PDH45M layer. Needless to say, a virtual object link as shown by a broken line in FIG. 4 is generated.

(Path Setting) FIG. 6 shows a path setting sequence according to the first embodiment. In FIGS. 3, 4, and 6, when a path is set between X and Z in the PDH2M layer, the path setting function (14) of the PDH2M layer receives the 2M path setting request and receives the SN object connection possibility information. (ConnectivityList), X, LT
The path of Pa, LTP-b and the path of X, LTP-b, LTP-c are immediately searched, and a 45M path setting request is sent to the path setting function (4) of the PDH 45M layer.

Then, the path setting function (4) of the PDH45M layer provides the Sub-OpS (Sub-OpS-A, Sub-OpS-B, S
ub-OpS-C, Sub-OpS-D), sends a control request for the cross-connect device related to the PDH45M layer, and, when a response of completion is received from the Sub-OpS of each domain, notifies the PDH2 of the completion.
It notifies the path setting function (14) of the M layer.

Therefore, the path setting function of the PDH2M layer
(14) Sub-OpS (Sub-OpS-A, Sub-OpS-B, S
ub-OpS-C, Sub-OpS-D), and sends a control request of the cross-connect device related to the PDH2M layer, and receives a completion response from the Sub-OpS of each domain. This gives X,
The path of the specified path is set among the paths of LTP-a and LTP-b and the paths of X, LTP-b and LTP-c.

As described above, in the path setting, the connectability information is pre-deployed, so that a layer in which a path setting request has occurred can immediately make a path setting request specifying a route to a lower layer. Fast END-TO-EN
D path setting can be performed. [Embodiment Corresponding to Claim 2] FIG. 7 shows a configuration example of a layer network according to an embodiment corresponding to claim 2.
This layer network shows a configuration example of a modified network in the case where a device is introduced or an optical fiber is added in the layer network shown in FIG.

In FIG. 7, in the PDH45M layer,
SN-B and SN-
A link is generated between the LTP-D and the LTP-d.
PC can be connected, and similarly, LTP-b is LT
It is shown that connection to LTP-d other than PC is possible.

FIG. 8 is a network information change sequence showing a procedure for performing such a network reconfiguration. 3 and 8, when there is an optical fiber addition or the like that causes a change in the network configuration in the PDH45M layer, the change is notified to the layer network information collection function (1). The layer network information collection function (1) gives the received changes to the layer network creation function (2).

The layer network creation function (2) sends "DB-locked" to the path setting function (4) to re-create the PDH45M layer network while preventing the database (5) from being changed. When the re-creation is completed, the layer network creation function (2) sends “DB-unlocked” to the path setting function (4), permits access to the database (5), and searches for a connectable point search function ( Send search request (change notification) to 3). The connectable point search function (3) receives the change notice of the 45M layer network, searches again for connectable points, updates the connectability information, and updates the PDH2M layer network information collection function (11). Notify the connected connectivity information.

As a result, in the PDH2M layer, the layer network creation function (12) receives the layer network creation request from the layer network information collection function (11), and sends “DB-locked” to the path setting function (14). To re-create the PDH2M layer network while preventing changes to the database (15). When the layer network creation function (12) ends the re-creation, the path setting function (14)
Sends "DB-unlocked" to, and permits access to the database (15). If there is a layer network above the PDH2M layer, the layer network creation function (12) requests the connectable point search function (13) to search for a route again. This is because it is necessary to notify the upper layer of the change.

In the re-creation by the layer network creation function (12), as described above, the layer network information collection function (12) is placed on the PDH2M layer network created based on the layer network information acquired from the layer network information collection function (11). 11) PD obtained via
The connectable point information of the H45M layer is deployed. Thus, in the present example, the two sub-networks SN-1 and S
LTP-a and LTP-d, LTP-a and L between N-2
TP-c, LTP-b and LTP-c, LTP-b and LT
It turns out that connection is possible with Pd.

Therefore, a layer network creation function (12)
Is connected to the subNetwork class
List) Update the attributes and register the updated attributes. Also,
A virtual link object (Virtua) as connection possibility information of LTP-a and LTP-d, and LTP-b and LTP-c.
lLink-1, 2), LTP-a and LTP-c, LTP
Generate and manage a virtual link object (VirtualLink-3, 4) as connection possibility information between -b and LTP-d.

As described above, in the PDH2M layer, the layer network information is recreated, and the SN1 connection possibility table and the SN2 connection possibility table are respectively changed and set as shown in FIG. The specific contents of each object are as follows. (1) SN1 object subNetwork attribute name: SNId (SN1) attribute name: LTPList (LTP-a, LTP-b, ...) attribute name: connectivityList ( (LTP-a, (LTP-c, LTP-d)), (LT
Pb, (LTP-c, LTP-d)) ) (2) SN2 object subNetwork attribute name: SNId (SN2) Attribute name: LTPList (LTP-c, LTP-d, ...) Attribute name: connectivityList ( (LTP- c, (LTP-a, LTP-b)), (LT
Pd, (LTP-a, LTP-b) )) (3) VirtualLink1 object Attribute name: VirtualLinkId (Link-1) Attribute name: A-TP (LTP-a) Attribute name: Z-TP (LTP-d) ( 4) VirtualLink2 object Attribute name: VirtualLinkId (Link-2) Attribute name: A-TP (LTP-b) Attribute name: Z-TP (LTP-c) (5) VirtualLink3 object attribute name: VirtualLinkId (Link-3) attribute Name: A-TP (LTP-a) Attribute Name: Z-TP (LTP-c) (6) VirtualLink4 Object Attribute Name: VirtualLinkId (Link-4) Attribute Name: A-TP (LTP-b) Attribute Name: Z -TP (LTP-d) [Embodiment Corresponding to Claim 3] FIG. 9 is a configuration example of a layer network according to an embodiment corresponding to claim 3.
This layer network is the PDH45M shown in FIG.
In the layer, SN-E is added, and as shown in FIG. 7, a link is generated between SN-B and SN-D in the PDH45M layer by device introduction or optical fiber addition, and as a result, in the PDH2M layer, LTP-a
Can be connected to LTP-c besides LTP-d,
Similarly, LTP-b is not only LTP-c but also LTP-d
When it becomes possible to connect with the access point D of SN-D and the access point E of SN-E,
As a result of setting the actual path using the link generated between SN-B and SN-D, AP-A, AP-D
And between AP-B and AP-C only, and as a result, in the PDH2M layer, LTP-a
It is possible to connect only to Pd, and similarly, LTP-b is
This shows a state in which connection with only LTP-c is possible.

FIG. 10 is a connection possibility information update sequence showing a procedure for updating the connection possibility information in such a case. 3 and 10, the PDH 45M layer path setting function (4) is a sub-OpS based on the 45M path setting request from the PDH 2M layer path setting function (14), and requests the sub-OpS to set a cross-connect device (cross-connect control). Request). As a result, in the PDH45M layer, as shown in FIG. 9, the SN-B is located between the access point D of the SN-D and the access point E of the SN-E.
The actual path using the link generated between the SN and the SN-D is set.

When the path setting function (4) receives the setting completion notification (end of the cross-connect control) from the sub-OpS, it notifies the layer network creation function (2) of the path setting. Upon receiving this path setting notification, the layer network creation function (2) sends a re-search request to the connectable point search function (3). As a result of the re-search of the connectable point search function (3), AP-A,
It turns out that connection is possible only between AP-D and between AP-B and AP-C. The connectable point search function (3) notifies such connectability information to the layer network information collection function (11) of the 2M layer.

2M layer network creation function
(12) generates a changed PDH2M layer network in response to a creation request from the layer network information collection function (11), and generates a layer network information collection function.
The connectable point information of the PDH45M layer obtained through (11) is deployed on the changed PDH2M layer network.

Thus, in the present example, LTP-a and LTP between the two sub-networks SN-1 and SN-2
-D, LTP-b and LTP-c can be connected. Therefore, layer network creation function (12)
Is the connectivity information of the subNetwork class (connectivity
List) Update the attributes and register the updated attributes. Also,
A virtual link object (Virtual Link Object) as connection possibility information of LTP-a and LTP-d, and LTP-b and LTP-c.
Link-1, 2), and other LTP-a and LTP-c, LT
The virtual link object (VirtualLink-3, 4) as the connection possibility information between Pb and LTP-d is deleted. During this time,
The layer network creation function (12) has a path setting function (1
In response to 4), “DB-locked” and “DB-unlocked” are sent to manage the database (15).

As a result, as shown in FIG. 9, the SN1 connection possibility table and the SN2 connection possibility table are respectively changed and set. The specific contents of each SN object after the change are as follows.

(1) SN1 object subNetwork attribute name: SNId (SN1) attribute name: LTPList (LTP-a, LTP-b,...) Attribute name: connectivityList ((LTP-a, LTP-d), (LTP- b, LTP-
d)) (2) SN2 object subNetwork attribute name: SNId (SN2) attribute name: LTPList (LTP-c, LTP-d, ...) attribute name: connectivityList ((LTP-d, LTP-a), (LTP- c, LTP-
b)) When the layer network creation function (12) finishes updating the SN object of the PDH2M layer, the end notification is sent to the layer network information collection function (11) and the PDH45M
It is transmitted to a path setting function (4) via a layer connectable point search function (3) and a layer network creation function (2). Upon receiving the end notification, the path setting function (4) notifies the path setting function (14) of the PDH2M layer of the end of the path setting.

[Embodiment Corresponding to Claim 4] FIG.
Is a configuration example of the layer network of the embodiment corresponding to claim 4. This layer network is the same as the layer network shown in FIG.
A virtual link object (Virtual link-3) set between LTP-a and LTP-c as a result of the link between NB and SN-D failing due to failure, quality degradation, or the like.
And a virtual link object (Virtual link-4) set between LTP-b and LTP-c.

The failure of the link between SN-B and SN-D is detected and notified by the lower layer or the device management unit. In the PDH45M layer, when the layer network information collection function (1) detects a link failure by a failure notification, it sends a creation request to the layer network creation function (2). Layer network creation function (2)
Sends a re-search request to the connectable point search function (3).

As a result, the connectable point search function (3)
A search is made again for a connectable point that does not pass through the failed link, and new connectability information is sent to the layer network information collection function (11) of the PDH2M layer. The layer network creation function (12) of the PDH2M layer receives the creation request from the layer network information collection function (11), reconfigures the layer network, and obtains the PDH45M acquired via the layer network information collection function (11). The layer connectable point information is deployed on the reconstructed PDH2M layer network.

Thus, in the present example, LTP-a and LTP between the two sub-networks SN-1 and SN-2 are used.
-D, LTP-b and LTP-c are found to be connectable, so the virtual link (Virtua
l link) Disable the enabled state of the object. This is achieved by providing the operationalState attribute as a usable state and changing from enable to disable. In the route search by the connectable point search function (3), a route passing through the unusable virtual link (Virtual link) is not selected.

As a result, the specific contents of each virtual link object are as follows. (1) VirtualLink1 object Attribute name: VirtualLinkId (Link-1) Attribute name: operationalState (enable) Attribute name: A-TP (LTP-a) Attribute name: Z-TP (LTP-d) (2) VirtualLink2 object Attribute name : VirtualLinkId (Link-2) attribute name: operationalState (enable) attribute name: A-TP (LTP-b) attribute name: Z-TP (LTP-c) (3) VirtualLink3 object attribute name: VirtualLinkId (Link-3) Attribute name: operationalState (disable) Attribute name: A-TP (LTP-a) Attribute name: Z-TP (LTP-c) (4) VirtualLink4 object Attribute name: VirtualLinkId (Link-4) Attribute name: operationalState (disable) Attribute name: A-TP (LTP-b) Attribute name: Z-TP (LTP-d) [Embodiment Corresponding to Claim 5] In an ATM layer network, since a band is basically variable, a virtual link is used. Bandwidth information (trafficDes) in the (VirtualLink) object
cription). For example, the layer network shown in FIG. 11 is as follows.

(1) VirtualLink1 object Attribute name: VirtualLinkId (Link-1) Attribute name: operationalState (enable) Attribute name: trafficDescription (2Mb / s) Attribute name: A-TP (LTP-a) Attribute name: Z-TP (LTP-d) (2) VirtualLink2 object Attribute name: VirtualLinkId (Link-2) Attribute name: operationalState (enable) Attribute name: trafficDescription (10Mb / s) Attribute name: A-TP (LTP-b) Attribute name: Z -TP (LTP-c) (3) VirtualLink3 object Attribute name: VirtualLinkId (Link-3) Attribute name: operationalState (disable) Attribute name: trafficDescription (6Mb / s) Attribute name: A-TP (LTP-a) Attribute name : Z-TP (LTP-c) (4) VirtualLink4 object Attribute name: VirtualLinkId (Link-4) Attribute name: operationalState (disable) Attribute name: trafficDescription (5Mb / s) Attribute name: A-TP (LTP-b) Attribute name: Z-TP (LTP-d) With this, in the path setting in the ATM layer network, the usable bandwidth of each virtual link can be determined, so that the path setting can be simplified. So as to.

[0070]

As described above, according to the first aspect of the present invention, when a communication network is managed by being divided into networks having a layer structure created based on network information collected from the operating system 1 of each network domain. In each layer network,
Since a virtual object link is set as connectability information, when a path setting request of END-TO-END is requested, a special path search request is generated without sending to a lower layer network. The END-TO-END path setting can be performed only by setting the communication path in the layer network based on the virtual object link. That is, since the route search procedure can be omitted, the END-TO-END path setting can be quickly performed.

According to the second aspect of the invention, when a change occurs in the layer network, the contents of the change can be notified to the upper layer, so that the network can be reliably managed and operated. According to the third aspect of the present invention, when the searched connectability information is used for path setting, the search for the connectability information is performed again, and the virtual object link is generated. If there is
We can respond smoothly.

According to the fourth aspect of the present invention, when a failure such as a failure or quality deterioration occurs between the created access points of the layer network, the connection possibility information in which the state information of the failure location is updated is transmitted. Since a fault is generated, when a fault occurs, a path can be set while avoiding the fault location. According to the fifth aspect of the present invention, when the transmission path is an ATM network, band information can be included, so that path setting is facilitated.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of the invention according to claim 1;

FIG. 2 is a configuration example of an operating system (OpS) according to an embodiment corresponding to claims 1 to 5;

FIG. 3 is a diagram showing a configuration and a relationship of each layer according to an embodiment corresponding to claims 1 to 5;

FIG. 4 is a configuration example of a layer network according to an embodiment corresponding to claim 1;

FIG. 5 is a network information collection sequence in the embodiment corresponding to claim 1;

FIG. 6 is a path setting sequence in the embodiment corresponding to claim 1;

FIG. 7 is a configuration example of a layer network according to an embodiment corresponding to claim 2;

FIG. 8 is an update sequence of connectable information in the embodiment corresponding to claim 2;

FIG. 9 is a configuration example of a layer network according to an embodiment corresponding to claim 3;

FIG. 10 is an update sequence of connectable information in the embodiment corresponding to claim 3;

FIG. 11 is a configuration example of a layer network according to an embodiment corresponding to claim 4;

FIG. 12 is a configuration example of a communication network.

FIG. 13 is a configuration example of a layer network.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Operating system 2 Layer network information collection function 3 Layer network creation function 4 Connectable point search function 5 Virtual object generation function 6 Path setting function 10 Main operating system (Main-O)
pS) 11 Sub-operating system (Sub-Op)
S) 12 Path management control 13 Layer management (PDH2M, PDH45M) 12a, (3), (13) Connectable point search function 12b, (2), (12) Layer network creation function 12c, (1), (11) Layer network information collection function 12d, (4), (14) Path setting function (5) (15) Database

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kyohei Iseda 4-1-1 Kamikadanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Takafumi Nakajo 4-chome, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 in Fujitsu Limited

Claims (5)

[Claims] 1. A communication network is divided and managed in a layered network created based on network information collected from operating systems of respective network domains, and each layer network has an END.
A communication network control method for setting a path of -TO-END, wherein each layer network has at least a layer network information collection function of collecting network information from an operating system of a network domain; A layer network creation function for creating the layer network based on the connectivity information collected from the lower layer network when there is a layer network, and an access point between the created layer network when there is an upper layer network. A connectability point search function for searching for connectability, generating the connectability information, and notifying the upper layer network, and as connectability information between access points of the created layer network. A virtual object generation function for generating a virtual object link based on connectability information collected from a lower layer network, and a path setting for setting a communication path in the layer network based on the generated virtual object link in response to a path setting request And a communication network control method having a function. 2. The communication network control method according to claim 1, wherein when a change occurs in the layer network, the layer network creation function detects a change in the layer network and reconfigures the layer network. Communication network control method, wherein the virtual object generation function updates the generated virtual object link. 3. The communication network control method according to claim 1, wherein the connectable point search function is performed again when the searched connectability information is used for path setting. A virtual object generating function for generating a virtual object again when the generated virtual object link is used as an actual link. 4. The communication network control method according to claim 1, wherein the connectable point search function searches for a connectability between the created access points of the layer network. In this case, when a failure, quality deterioration, or the like is detected, the communication network control method is characterized by generating connectability information in which state information of the detected location is updated. 5. The communication network control method according to claim 1, wherein the virtual object link as the connectability information includes band information. Network control method.