KR20100067015A - Packet-optical integrated switch - Google Patents

Abstract

PURPOSE: A packet-optical integration switch offering an OAM function for a multilayer transmission service supply is provided to perform the OAM function for supplying multi-layer transmission service and manage communication network. CONSTITUTION: An OAM manager(122) manages class trouble information collected through the OAM agent. A message communication unit(123) interfaces the messages. The messages are the interval of the OAM agent and OAM manager.

Description

Packet-Optical Integrated Switch

The present invention relates to a packet-optical integrated switch of the present invention, and more particularly, to a packet-optical integrated switch capable of providing an operation, administration & maintenance (OAM) function for providing a multi-layer transmission service.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research and Development. [Task management number: 2008-S-010-01, Task name: Multi-layer optical network control platform technology Development].

In order to operate a communication network in which a plurality of communication devices are complicatedly connected, it is essential to control each communication network device constituting the communication network and to manage failures generated in each communication network device.

In the conventional network operation and failure management, each device is controlled through an element management system (EMS), a network management system (NMS), or a terminal terminal configured for each communication network technology or each layer. This has been done by collecting fault information and analyzing the cause.

The communication network operation and failure management method is composed of simple hierarchy of transmission network and switching network. In the case of the existing telephone network which is relatively statically managed, there is no big problem in control and failure.

However, the current communication network is evolving in the direction of providing all services based on the IP (Internet Protocol) which has a lot of changes, and since various lower layer networks can be used, a communication network having a multi-layer overlay structure is being created.

However, existing hierarchical equipment is sporadically installed, operated and managed. In other words, the network devices of each layer are managed as separate devices, and in a very serious case, they are managed by a separate NMS or EMS for each layer. There is a problem that can be analyzed and identified.

Therefore, the need for a functional structure for OAM (Operation, Administration & Maintenance) of a system that integrates L0 (Lamda), L1 (SDH / SONET), and L2 (Ethernet or Packet Transport Layer) into a single system is emerging.

Accordingly, in the present invention, by providing an OAM device that integrally recognizes and manages fault information for each layer in a communication network having a structure overlaid on a multi-layer and provides an information transmission path, an OAM function for providing a multi-layer transmission service can be performed. To provide a packet-optical integrated switch.

As a means for solving the above problems, a packet-optical integrated switch according to an embodiment of the present invention comprises an OAM (Operation, Administration & Maintenance) agent for collecting the failure information for each layer; An OAM manager that collectively recognizes and manages failure information for each layer collected through the OAM agent; And a message communication unit for interfacing messages transmitted and received between the OAM manager and the OAM agent and between the OAM manager and functional blocks requiring the layer-specific failure information.

The OAM manager is characterized in the integrated recognition and management of the failure information for each layer according to a standard proposed by one or more standardization organizations of IEEE, ITU-T and MEF.

The OAM manager recognizes and manages fault information of the L0 and the L1 based on the standards set forth in ITU-T G.874 and the standards set forth in the ITU-T G.7710 for L0 and L1. It is characterized by recognizing and managing failure information based on the standard proposed by IEEE 802.1ag.

The functional blocks may include a protection & restoration (P & R) device for performing a protection and recovery operation of a failed path; A control plane for performing call connection operations in consideration of a failure occurring in each layer; A data plane requesting to perform an OAM operation and notifying the result; A link management function (LMF) for performing link management operations in consideration of a failure occurring in each layer; And an Enhanced-Network Control Processor (E-NCP) for rerouting in consideration of failures occurring in each layer.

The message communication unit may include a first internal interface for interfacing a message between the OAM agent and the OAM manager; A second internal interface for interfacing a message between the OAM agent and the P & R device; A first external interface for interfacing a message between the OAM agent and the control plane; A second external interface for interfacing a message between the OAM agent and the data plane; A third external interface for interfacing a message between the OAM agent and the LMF; And a fourth external interface for interfacing the message between the OAM agent and the E-NCP.

The packet-optical integrated switch of the present invention is provided with an OAM device that collectively recognizes and manages fault information for each layer in a communication network having a structure overlaid with a multi-layer and serves as an information transmission path to other functional blocks. As a result, the OAM function for providing a multi-layer transmission service may be performed in a communication network having a structure overlaid with a multi-layer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

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

1 is a diagram illustrating a configuration of a packet-optical integrated switch including an operation, administration & maintenance (OAM) device according to an embodiment of the present invention.

As shown in FIG. 1, a packet-optical integrated switch according to an exemplary embodiment of the present invention includes a system management plane 100, a control plane 200, and a data plane 300. ) And LMF (Link Management Function, 400), the system management plane (100) is a failure that occurs in each layer in addition to the protection & restoration (P & R) device 110, which is an existing device that protects and recovers a failed path. It further comprises an OAM device 120 to collect and recognize and manage collectively.

That is, the OAM device 120 collectively recognizes and manages fault information for each layer and interoperates with the functional blocks 110, 200, 300, 400, and 500 that operate separately for each layer, so that the packet-optical integrated switch serves as a service. It can provide stable operation, efficient management, service status monitoring and quick recovery function.

The OAM device 120 is connected to each of L0 (Lamda), L1 (SDH / SONET), and L2 (Ethernet or Packet Transport Layer) to operate separately, and fault information that may affect routing settings occurring in each layer. The fault information of each layer is integrated and recognized according to a standard proposed by one or more standardization organizations of the OAM agent 121, IEEE, ITU-T, and MEF which collects and delivers them to the OAM manager 122. It manages, and interfacing the message transmitted and received between the OAM manager 122, and the OAM manager 122 and each functional block to control the failure information required in a specific function block to the corresponding function block as It is configured to include a message communication unit 123 to perform a role.

Looking at the operation of the OAM device 120 configured as described above for each layer as follows.

First, the OAM apparatus 120 (particularly, the OAM manager 122) uses L0 (Lamda) and L1 (Lamda) and L1 (SDH / SONET) based on the standards set forth in ITU-T G.874. System-level supervision, validation, and alarm handling for SDH / SONET are performed.

And for each function, the integrated process between the transmission, QoS, processing, hardware monitoring functions and failures that cause the failure, based on the standards set out in ITU-T G.7710. Verification of the problem is performed through.

In addition, alarm reporting methods (e.g. Critical, Major, Minor, Warning) for alarms and related failures (eg , Alarm reporting method according to severity, ARC (Alarm Reporting Control) is designated and alarm function is executed accordingly.

Subsequently, the OAM device 120 provides a connectivity fault management (CFM) function based on a standard proposed by IEEE 802.1ag to ensure the validity of routing for L2 (Ethernet or Packet Transport Layer). .

In addition, it provides loopback and link trace functions for trouble shooting, and provides CC (Continuity Check) function for quick failure detection.

The main information to be managed in the OAM device 120 according to the present invention can be managed by classifying them into layers and providing them to the functional blocks that require them.

2 is a diagram illustrating a Management Information Base (MIB) managed by the OAM apparatus 120 according to an embodiment of the present invention.

As shown in FIG. 2, the management data corresponding to L0 is stored in the MIB0 600 for L0, and the ITU-T G.874 is stored in MIB1 601 for L1. Management data corresponding to L1 is stored.

At this time, the management data according to ITU-T G.874 includes the management data for the unit alarms, the network element alarms, and the station alarms, and the current problem list. Management data for alarms, alarm severity and alarm reporting methods.

MIB2 602 for L2 stores management data for L2 among management data according to IEEE 802.1ag.

At this time, the management data according to IEEE 802.1ag includes management data for Continuity Check Message (CCM) for fault detection, management data for LBM (Loopback Message) for fault detection and verification, and LBR (Loopback). Management data for a reply).

In the above embodiment, for convenience of description, a method of defining and managing layer-specific management data by ITU-T G.874 and IEEE 802.1ag has been described. However, in an actual application example, OAM for providing a multi-layer transmission service is provided. It can be defined and managed by all the standards related to the function. In addition, it is a matter of course that the type of management data managed for each layer may be further divided and diversified by the standards.

In addition, the OAM device 120 of the present invention includes a plurality of interfaces corresponding to each functional block, thereby supporting the role of the failure information transmission path.

3 is a diagram illustrating a detailed configuration of the message communication unit 123 according to an embodiment of the present invention.

Referring to FIG. 3, the message communication unit 123 of the present invention is configured for communication between external functional blocks and interfaces (first and second internal interfaces I1 and I2) for communication with internal functional blocks. It consists of interfaces (first to fourth external interfaces E1 to E4).

The first internal interface I1 is an interface formed between the OAM agent 121 and the OAM manager 122. The OAM agent 121 may manage the failure information collected for each layer by the OAM manager 122. Performs a function of providing the failure information collected for each layer to the OAM manager 122.

The second internal interface I2 is an interface formed between the OAM manager 122 and the P & R device 110 so that the P & R device 110 can perform an appropriate protection and recovery operation for the failed path. The 122 performs a function of providing the P & R device 110 with information about a failure requiring the system protection and recovery operation.

The first external interface E1 is an interface formed between the OAM agent 121 and the control plane 200, so that the control plane 200 may perform a call connection operation in consideration of failure information generated at each layer. The 121 performs a function of providing the control plane 200 with connection information for performing OAM and state change information about a connection in which a failure is detected.

The second external interface E2 is an interface formed between the OAM agent 121 and the data plane 300. The second external interface E2 requests information to perform an OAM operation between the OAM agent 121 and the data plane 300 and informs of a result. Performs the function of transmitting and receiving.

The third external interface E3 is an interface formed between the OAM agent 121 and the LMF 400 so that the LMF 400 can perform a link management operation according to failure information generated at each layer. Performs a function of providing layer-specific failure information to the LMF 400.

The fourth external interface E4 is an interface formed between the OAM agent 121 and the E-NCP 500. The fourth external interface E4 allows the E-NCP 500 to reset the path according to failure information generated at each layer. 121 performs a function for providing the E-NCP 500 with fault information related to route setting.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art.

1 is a diagram showing the configuration of a packet-optical integrated switch including an OAM apparatus according to an embodiment of the present invention.

2 is a diagram illustrating a management information base managed by an OAM apparatus according to an embodiment of the present invention.

3 is a diagram illustrating a detailed configuration of a message communication unit according to an embodiment of the present invention.

Claims (5)

OAM (Operation, Administration & Maintenance) agent to collect failure information by layer; An OAM manager that collectively recognizes and manages failure information for each layer collected through the OAM agent; And And a message communication unit for interfacing messages transmitted and received between the OAM manager and the OAM agent and between the OAM manager and functional blocks requiring layer-specific failure information. The method of claim 1, wherein the OAM manager Packet-optical integrated switch, characterized in that the integrated recognition and management of the layer-specific failure information in accordance with standards proposed by one or more standardization organizations of IEEE, ITU-T and MEF. The method of claim 2, wherein the OAM manager Regarding L0 and L1, the fault information of L0 and L1 is recognized and managed based on the standard of ITU-T G.874 and the standard of ITU-T G.7710, and IEEE 802.1ag for L2. Packet-optical integrated switch, characterized in that the recognition and management of fault information based on the standard proposed by. The method of claim 1, wherein the functional blocks A Protection & Restoration (P & R) device that performs protection and recovery operations of a failed path; A control plane for performing call connection operations in consideration of a failure occurring in each layer; A data plane requesting to perform an OAM operation and notifying the result; A link management function (LMF) for performing link management operations in consideration of a failure occurring in each layer; And A packet-optical integrated switch comprising an Enhanced-Network Control Processor (E-NCP) that reroutes in view of failures at each layer. The method of claim 4, wherein the message communication unit A first internal interface for interfacing a message between the OAM agent and the OAM manager; A second internal interface for interfacing a message between the OAM agent and the P & R device; A first external interface for interfacing a message between the OAM agent and the control plane; A second external interface for interfacing a message between the OAM agent and the data plane; A third external interface for interfacing a message between the OAM agent and the LMF; And And a fourth external interface for interfacing the message between the OAM agent and the E-NCP.

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