KR20140092690A - Method and apparatus for synchronizing path information in multi hierarchical network - Google Patents

Abstract

A method and apparatus for synchronizing path information in a multi-layer network. The path information synchronization method according to an embodiment of the present invention includes a step of matching path information for path synchronization between a network management system and a node and a step of synchronizing path planes of respective planes including a management plane, And matching each of the corresponding planes of the adjacent nodes with the path information for each plane.

Description

[0001] The present invention relates to a method and apparatus for synchronizing path information in a multi-layer network,

The present invention relates to a multi-layer network, and more particularly, to an automation technique for preventing path state mismatch in a multi-layer network.

Packet and optical communication networks are becoming more automated and advanced due to the development of transmission technology elements such as Automatic Switched Optical Network (ASON), and are being used for auto-discovery and one-click provisioning ) Function, and it aims to reduce operation and investment cost by using a lot of intelligent factors.

Systems in the delivery network can perform route setting management functions through a command line interface (CLI) command or can remotely manage route setting functions using an element management system (EMS) . Permanent-Connection (PC) based on management plane and Soft-Permanent Connection (SPC) based on control plane use network management system.

In general, the PC-based connection is provided to guarantee integrity in an all-or-nothing manner in the central management system, but the SPC method based on the distributed protocol does not allow for a rollback inconsistent state Can exist. This is a significant factor in the operation of defect-free systems. In particular, in a network in which a multi-layer system is integrated, for example, an optical-line-packet switching integrated network, errors may occur due to the complexity of interrelated components inherent in the operation automation. Inefficient error handling procedures can be repeated. Accordingly, there is a need for a technique for preventing mismatch of path information so as not to cause a system error due to mismatched path information in various levels of path state management steps.

According to an embodiment, there is provided a path information synchronization method and apparatus for improving integrity, operational efficiency, and stability by preventing a path state mismatch occurring in a network operation in a multi-layer network.

According to an embodiment of the present invention, there is provided a method of synchronizing path information in a multi-layer network, the method comprising: matching path information for path synchronization between a network management system and a node; And matching the path information with each corresponding plane of the adjacent node for each plane for path synchronization.

In the step of matching the path information for the path synchronization between the network management system and the node, when the network management system requests the path setting to the ingress node, the automatic path establishment is performed between the nodes through the signaling protocol, Receiving a notification message including trap information from the ingress node and the egress node and maintaining the final path information; and if a problem is found in the trap information of the end node or in the trap information received from the end node, And returning to the previous path, thereby matching the path information.

The step of matching the corresponding planes of the adjacent nodes and the path information of the adjacent planes for each plane determines whether or not the path states coincide with each other for the path synchronization between the resource management elements of the management plane with the adjacent node, And deleting the corresponding path information and blocking the resource allocation for the path.

The step of matching the corresponding planes of the adjacent nodes and the path information of each of the planes may further include a step of controlling operation setting and operating time for path synchronization between resource management elements of the management plane with the adjacent node have.

The step of matching the corresponding planes of the adjacent nodes and the path information of the adjacent nodes for each plane includes receiving the resource reservation protocol based bundle message including the path mismatch information from the adjacent node for the path synchronization between the control plane and the adjacent node, Determining that the path status is inconsistent and deleting the corresponding path information, and notifying the network management system of the path information deletion result.

The step of matching the corresponding plane and the corresponding path information of the adjacent node for each plane may include: checking the connection status from the node where the problem occurs during the monitoring of the path status for the path synchronization between the control plane and the adjacent node, Determining that the path status is inconsistent and deleting the corresponding path information, and notifying the network management system of the path information deletion result.

The step of matching each plane and the corresponding path information of the adjacent node for each plane determines whether or not the path state is coincident with the same path for the path synchronization between the transmission plane with the adjacent node and, And notifying the network management system of the path information deletion result.

The nodes of the multi-layer network may have a system for integrating multi-layers including an optical layer, a circuit layer and a packet transfer layer, and controlling and managing the same in a single system to provide an integrated optical-line-packet transmission path.

According to another aspect of the present invention, there is provided an apparatus for synchronizing path information in a multi-layer network, comprising: a first synchronization unit for synchronizing path information for path synchronization with a network management system; And a second synchronization unit for matching the path information of each of the corresponding planes of the adjacent nodes for each plane for path synchronization of the respective planes.

The first synchronization unit may synchronize with the network management system by returning to the previous path to match the path state when a trap problem with the network management system occurs.

The second synchronization unit determines whether or not the path states coincide with each other for the same path in order to synchronize the path between the resource management elements of the management plane with the adjacent node, and if the mismatch occurs, deletes the corresponding path information, And a management plane synchronization unit for intercepting the management plane.

The second synchronization unit may receive a resource reservation protocol based bundle message including path inconsistency information from a neighboring node for path synchronization between the control plane and a neighboring node, The control plane synchronization unit may determine that the inter-node path state is inconsistent and delete the corresponding path information.

The second synchronization unit may include a transport plane synchronization unit for determining whether or not the path conditions are coincident with respect to the same path in order to perform path synchronization between transmission planes with adjacent nodes, and deleting the corresponding path information when inconsistencies occur.

According to one embodiment, resources are wasted due to existence of a step of checking mismatch between various planar elements inside and outside the system in the most fundamental and important configuration and path setting step in managing a network composed of optical-line-packet integrated switch systems This can eliminate possible configuration errors and improve the reliability of the network maintenance phase.

First, it provides verification and action steps for routing inconsistencies in multi-layer transport network resources and path management to provide information integrity and prevent waste of resources. That is, by applying the path information synchronization procedure in the network management system, highly reliable network management function can be performed.

Second, it guarantees the integrity of propagation resources and path status information in multi-plane operating environment. That is, in the case of the control plane, it is possible to provide a simple path information synchronization step through conformance and expansion of the standard, and to prevent the path information discrepancy through the synchronization process between the nodes in the management plane or the transfer plane.

1 is a block diagram of a multi-layer network to which the present invention is applied;
FIG. 2 is a reference diagram for explaining path management information synchronization through a path manager in a multi-layer network according to an exemplary embodiment of the present invention;
3 is a reference diagram for illustrating path management information synchronization (MP LSP Sync) through management plane communication in a multi-layer network according to an embodiment of the present invention;
FIG. 4 is a reference diagram for explaining path management information synchronization (CP LSP Sync) through control plane communication in a multi-layer network according to an embodiment of the present invention;
FIG. 5 is a reference diagram for explaining path management information synchronization (FP LSP Sync) through inter-transport plane communication in a multi-layer network according to an embodiment of the present invention;
6 is a configuration diagram of a path information synchronization apparatus in a multi-layer network according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention of the user, the operator, or the custom. Therefore, the definition should be based on the contents throughout this specification.

1 is a configuration diagram of a multi-layer network to which the present invention is applied.

Referring to FIG. 1, a multi-layer network includes nodes 1-1, 1-2, and 1-3 and a path manager 2 (EMS) of an EMS (EMS) ).

The nodes (1-1, 1-2, and 1-3), which are network devices, have a multi-layer integrated switching system. The multi-layer integrated switching system includes an OCES (Optical Carrier Ethernet Switch) Hereinafter referred to as " OCES "). The system integrates multiple layers including an optical layer, a circuit layer, and a packet transfer layer, and controls and manages them in a single system, thereby efficiently providing a broadband high-reliability optical-line-packet integrated delivery path. At this time, the nodes 1-1, 1-2, and 1-3 manage and control resources for at least one of the above-described multiple layers.

In FIG. 1, an ingress node 1-1, a transit node 1-2 and an egress node 1-3 are referred to as cities However, the present invention is not limited thereto.

Each of the nodes 1-1, 1-2, and 1-3 communicates between planes by introducing an abstract concept, Plane, to distinguish between information to be transmitted and received by a user and control information and management information required for network operation . For example, each of the nodes 1-1, 1-2, and 1-3 is divided into a Management Plane (MP), a Control Plane (CP), and a Forwarding Plane (FP) Each plane contains elements for performing the function.

The control plane may be a protocol such as link management (e.g., Link Management Protocol (LMP)), routing (e.g., Open Shortest Path First-Traffic Engineering (OSPF-TE)) and signaling (e.g., Resource Reservation Protocol- Lt; RTI ID = 0.0 > node < / RTI > The management plane performs functions for main configuration, failure and performance management of a multi-layer network device. The elements of interest in the present invention are a configuration server for optical-line-packet path management and a call- Admission Controller (CAC).

EMS is a system that operates nodes (1-1, 1-2, and 1-3) in the form of automation and centralization. The EMS stores the information of the operators and manages the nodes (1-1, 1-2, and 1-3) by the operator. The EMS includes a path manager 2 that unifies and manages all optical-line-packet delivery resources and path information of the nodes 1-1, 1-2, and 1-3. In this case, the nodes 1-1, 1-2, and 1-3 may be classified into a multi-layered system such as a Permanent Connection (PC), a Soft Permanent Connection (SPC), and a Switched Connection , To ensure the integrity, integrity and reliability of system information in multi-plane environments.

The present invention provides path condition information consistency between EMS and nodes (1-1, 1-2, 1-3) or among multi-plane elements provided within nodes (1-1, 1-2, And automation techniques to maintain integrity.

FIG. 2 is a reference diagram for explaining path management information synchronization through a path manager in a multi-layer network according to an exemplary embodiment of the present invention. Referring to FIG.

EMS can provide path setting function by PC method. That is, when the EMS receives the path generation request signal, it calculates the optimal path, transmits the cross-connection setup command to all corresponding nodes, receives the result from the nodes, and maintains the final path information in an all-or- (PC req / rsp). Up to this point, it is a representative path management function provided as a one-click provisioning function.

On the other hand, in the SC / SPC scheme, when the path manager 2 of the EMS requests the path setting only to the input node 1-1 (SC / SPC req) (200) and the automatic path setting is performed by the signaling function between the nodes (SC / SPC trap from ingress / egress node) 210 from the two end nodes 1-1 and 1-3 to maintain the final path information. At this time, if the trap occurs in only one node or there is an anomaly in the trap information, it is determined that the path information is inconsistent, and the path return procedure is performed to maintain the information consistency. The trap problem refers to the problem that there is no auxiliary path for one main path.

3 is a reference diagram for illustrating path management information synchronization (MP LSP Sync) 300 through management plane communication in a multi-layer network according to an embodiment of the present invention.

Referring to FIG. 3, the management plane (MP) provides OAM & P (Operation, Administration, Maintenance and Provisioning) functions, components, fault and performance management functions. In general, the components of the management plane perform maintenance and path setting of physical and logical information installed on a node-by-node basis by inherent functions. According to the present invention, reliability is improved by eliminating path mismatch information through communication between path validation elements of the management plane. .

In other words, there is an element for determining whether a resource is allocated when a path setting is requested in the management plane, thereby maintaining a resource reservation and allocation state. If the path state is inconsistent with respect to the same label switching path (LSP) between the nodes, it is determined that the path information is an error, and the inconsistency information is deleted and unnecessary occupation of resources is blocked.

Conventionally, the resource management function is performed on a node-by-node basis. However, according to the present invention, path inconsistency information can be removed through communication (MP LSP Sync) This communication function can provide efficiency and flexibility by controlling operation setting and operation time together.

4 is a reference diagram for explaining path management information synchronization (CP LSP Sync) 400 through control plane communication in a multi-layer network according to an embodiment of the present invention.

The Control Plane (CP) has intelligent functional elements that perform automation of network management using link management, routing, and signaling protocols. It also provides dynamic path control based on the IETF standard protocol. Among these, a path request and a resource reservation step (LSP Path / Resv) through a signaling protocol such as resource reservation protocol-traffic engineering (RSVP-TE) are the final stages of path setting. For single path establishment and traffic transmission, the conditions must be met from the upper management element to the forwarding and data plane elements, and more complex situations should be considered in complex multi-layer and multi-plane environments.

However, if an error occurs after the signaling step in any node despite the successful completion of all resource reservation for the path through the signaling protocol, even if the refresh function is provided, the path information of the control plane The discrepancy still exists.

The IETF RFC3209 RSVP-TE signaling protocol provides a refresh procedure for state synchronization. However, this function is only valid for the activated path. Furthermore, in order to reduce the burden of the synchronization procedure, the standard RFC2961, which establishes a method such as a summary refresh (Srefresh), specifies that when a mismatch occurs, it is ignored and no action is taken. But this ultimately leads to waste of resources. Here, Srefresh is a function that expresses each id as a unique id for each LSP that is set up, and conveys a plurality of represented id's by a message. The Srefresh function is a unique ID that differs from the existing Refresh message that delivers a path or a Resv message Only. In order to solve the above-described problems, the present invention uses the existing standard protocol as it is but provides a function extension.

In accordance with one embodiment, the present invention provides a resource reservation protocol (RSVP) based bundle message that includes path mismatch information from neighboring nodes for path synchronization between control planes during a CP LSP Sync 400 procedure between adjacent nodes Upon receipt, it is determined that the node-to-node path conditions are inconsistent and the corresponding path information is deleted. Then, the result of route information deletion is notified to the network management system. The bundle message is a message for grouping a plurality of RSVP-TE signaling messages into one message.

According to another embodiment of the present invention, when a connection status check negative response (Srefresh_NACK) message is received from a node that has experienced a problem during monitoring of path status through control plane communication with an adjacent node, it is determined that the node- The corresponding path information is deleted.

Hereinafter, a process of confirming and monitoring the connection status with neighbor nodes in each transmitting and receiving node using Srefresh will be described. The process of checking and monitoring the connection status is as follows. After the routing is established, the transmission node requesting status confirmation transmits a connection status confirmation message (Srefresh) at predetermined intervals. The connection status confirmation message (Srefresh) is established between the end nodes, so that it can be used independently at the initial transmission node, the intermediate node, and the destination node.

On the other hand, the receiver transmits a connection status confirmation response message (Srefresh_ACK) if the connection state between the transmission nodes is complete, and transmits a connection state check negative response (Srefresh_NACK) message if the connection state is not complete. If a problem occurs in the node during the connection status monitoring operation, the node in question transmits a connection status check negative response (Srefresh_NACK) message to the partner node, and releases the path status that was initially set.

5 is a reference diagram for explaining path management information synchronization (FP LSP Sync) 500 through inter-transport plane communication in a multi-layer network according to an embodiment of the present invention.

Referring to FIG. 5, the control of the substantial transfer signal inside the node is made by the transfer plane element. Therefore, at this stage, it is also possible to analyze and arrange inconsistencies of path information between nodes. If there is inconsistency information between nodes through the transfer plane communication for the FP LSP Sync 500, the information is removed and the network management device is notified. This function also controls whether it is active / inactive, It is possible to perform securely without affecting the delivery network service.

By applying the four-stage path information synchronization technique as described above with reference to FIGS. 2 to 5, the present invention can perform management, control, and propagation path matching procedures of the path manager and the optical- The network level consistency of the multi-layer path information is ensured without increasing the burden on the system, and a more reliable transmission network system and its management system are constructed.

6 is a configuration diagram of an apparatus 10 for synchronizing path information in a multi-layer network according to an embodiment of the present invention.

Referring to FIG. 6, the path information synchronization apparatus 10 is located at a node of a multi-layer network and includes a first synchronization unit 100 and a second synchronization unit 110.

The first synchronization unit 100 synchronizes the path information with the EMS in order to synchronize the path information with the EMS, and the second synchronization unit 110 synchronizes the path information with the neighboring node, including the management plane, the control plane, In order to synchronize the paths of the planes, the path information is matched in each plane based on the node-specific multilayer path state.

According to one embodiment, the first synchronization unit 100 performs synchronization with the network management system by returning to the previous path in order to match the path state when a trap problem with the EMS occurs.

That is, when the path manager of the EMS requests the path setting at the ingress node, the automatic path setting is performed between the nodes through the signaling protocol, and the path manager receives the notification message including the trap information from the ingress node and the egress node which are the end nodes And maintains the final path information. However, if a trap problem occurs in the end node or a problem is found in the trap information received from the end node, the path manager judges that the path state is inconsistent and returns to the previous path, thereby matching the path information.

According to one embodiment, the second synchronization unit 110 includes a management plane synchronization unit 120, a control plane synchronization unit 130, and a transfer plane synchronization unit 140.

The management plane synchronization unit 120 determines whether or not the path states of the same path coincide with each other in order to synchronize paths between resource management elements of the management plane with the adjacent node, and when the mismatch occurs, the corresponding path information is deleted, Blocks resource allocation for.

The control plane synchronization unit 130 receives the resource reservation protocol based bundle message including the path mismatch information from the adjacent node for path synchronization between the control plane with the adjacent node, Upon receiving the negative response message, it is determined that the path state between the nodes is inconsistent, and the corresponding path information is deleted.

The propagation plane synchronization unit 140 determines whether or not the path conditions are coincident with respect to the same path in order to synchronize paths between the transmission planes with adjacent nodes, and deletes the corresponding path information in the case of inconsistency.

The management plane synchronization unit 120, the control plane synchronization unit 130, and the transfer plane synchronization unit 140 share path state information with each other to maintain path state information consistency and integrity.

The embodiments of the present invention have been described above. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

1-1, 1-2, 1-3: Network Device 2: Path Manager
10: Path information synchronization apparatus 100:
110: second synchronization unit 120: management plane synchronization unit
130: control plane synchronization unit 140: transfer plane synchronization unit

Claims (13)

A method for synchronizing path information in a multi-layer network,
Matching the path information for path synchronization between the network management system and the node; And
Matching path planes and corresponding planes of adjacent nodes for each plane based on a multi-layer path state for each node for path synchronization of each plane including a management plane, a control plane, and a transfer plane between adjacent nodes;
The path information synchronization method comprising: The method of claim 1, wherein the step of matching the path information for path synchronization between the network management system and the node comprises:
When the network management system requests routing to the ingress node, automatic routing between the nodes is performed through the signaling protocol. The network management system responds to the notification message including the trap information from the ingress node and the egress node, which are end nodes Maintaining final path information; And
If a trap problem occurs in the end node or a problem is found in the trap information received from the end node, the network management system determines that the path status is inconsistent and reconciles the path information according to return to the previous path;
The path information synchronization method comprising: 2. The method of claim 1, wherein the step of matching the corresponding plane and the path information of the adjacent nodes for each plane comprises:
Determining whether or not the path states of the same path coincide with each other for path synchronization between resource management elements of the management plane with the adjacent node, deleting the corresponding path information and blocking resource allocation for the path if the path status is inconsistent;
The path information synchronization method comprising: 4. The method as claimed in claim 3, wherein the step of matching the corresponding planes of the adjacent nodes with the path information,
Controlling operation setting and operation time together for path synchronization between resource management elements of a management plane with a neighbor node;
Further comprising the step of: 2. The method of claim 1, wherein the step of matching the corresponding plane and the path information of the adjacent nodes for each plane comprises:
Receiving a resource reservation protocol based bundle message including path inconsistency information from a neighbor node for path synchronization between a control plane with a neighbor node, deleting the corresponding path information by determining that the inter-node path state is inconsistent; And
Notifying a network management system of a result of deleting path information;
The path information synchronization method comprising: 2. The method of claim 1, wherein the step of matching the corresponding plane and the path information of the adjacent nodes for each plane comprises:
When receiving a connection status check negative response message from a node that has a problem during path status monitoring for a path synchronization between a control plane and a neighboring node, deleting the corresponding path information by determining that the path status between nodes is inconsistent; And
Notifying a network management system of a result of deleting path information;
The path information synchronization method comprising: 2. The method of claim 1, wherein the step of matching the corresponding plane and the path information of the adjacent nodes for each plane comprises:
Determining whether path conditions are coincident with respect to the same path for path synchronization between the transmission plane and the adjacent node, and deleting the corresponding path information if the path condition is inconsistent; And
Notifying a network management system of a result of deleting path information;
The path information synchronization method comprising: The method of claim 1, wherein the nodes of the multi-
And a system for integrating multi-layers including an optical layer, a circuit layer, and a packet transfer layer, and controlling and managing the same in a single system to provide an integrated optical-line-packet transmission path. A path information synchronization apparatus in a multi-layer network,
A first synchronization unit for matching the path information for path synchronization with the network management system; And
A second synchronization unit for synchronizing the corresponding planes of the adjacent nodes with the path information for each plane for the path synchronization of the respective planes including the management plane, the control plane, and the transmission plane;
Wherein the path information synchronization unit comprises: The apparatus of claim 9, wherein the first synchronization unit comprises:
And returns to the previous path to synchronize with the network management system when a trap problem with the network management system occurs to match the path status. The apparatus of claim 9, wherein the second synchronization unit comprises:
In order to synchronize the path between the resource management elements of the management plane with the adjacent node, it is determined whether or not the path states coincide with each other for the same path. In case of inconsistency, the corresponding path information is deleted and the management plane A synchronization unit;
Wherein the path information synchronization unit comprises: The apparatus of claim 9, wherein the second synchronization unit comprises:
When receiving a resource reservation protocol based bundle message containing path mismatch information from a neighboring node for path synchronization with a neighboring node or receiving a connection status check negative response message from the node in question during route status monitoring, A control plane synchronization unit for determining that the path status is inconsistent and deleting the corresponding path information;
Wherein the path information synchronization unit comprises: The apparatus of claim 9, wherein the second synchronization unit comprises:
A transfer plane synchronization unit for determining whether path conditions are coincident with respect to the same path for path synchronization between the transfer plane with the adjacent node and deleting the corresponding path information when there is a mismatch;
Wherein the path information synchronization unit comprises:

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