WO2007048307A1

WO2007048307A1 - A method, system and network device for implementing operation administration maintenance in a network

Info

Publication number: WO2007048307A1
Application number: PCT/CN2006/002457
Authority: WO
Inventors: Hao Wang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-10-24
Filing date: 2006-09-20
Publication date: 2007-05-03
Also published as: CN1866862A; CN100417091C

Abstract

A method for implementing Operation Administration Maintenance in a network includes: in the interconnection network system of the Ethernet and the Asynchronous Transfer Mode (ATM), when determining the Ethernet is fault, informing the fault message comprising the fault information to the ATM terminal system; the ATM terminal system implements the Operation Administration Maintenance(OAM) action according to the received fault message of the Ethernet system. The method and the system according to the invention insures that it can realize the OAM interconnection function, when the Ethernet is regard as a carrier network carrying the ATM service; when the ATM service is fault, the upper layer ATM network can determine in time the reason and location of the ATM service fault according to the received under layer Ethernet fault message in order to quicken the fault implement process. It improves the OAM mechanism when the Ethernet carries the ATM service. It improves the operateability and the maintainability of the network.

Description

Implementation method, system and network device for operation and maintenance in network

Technical field

The present invention relates to the field of Ethernet and asynchronous transmission mode interworking network technologies, and in particular, to an implementation method, system and network device for operation and maintenance in an Ethernet and asynchronous transmission mode. Background of the invention

ETH (Ethernet, Ethernet) services continue to evolve from the local area network to the metropolitan area network and telecommunication network. In addition, DSL (Digital Subscriber Line) services and ATM (Asynchronous Transfer Mode) services can be implemented in the Ethernet network.

Currently, the networking model for interworking between Ethernet and ATM services is shown in Figure 1.

When an alarm occurs on a device in the current ATM network, the alarm information can be interconnected in the ATM network. The network model shown in Figure 1, for example, when the ATM terminal system 1 fails, the process of notifying the ATM terminal system 2 of the fault alarm message is:

The ME (Maintenance Entity, Maintenance Entity) in the ATM terminal system 1 generates a forward alarm message, that is, an ATM-AIS (Alarm Indication Signal) message, and sends the message to the ATM terminal system 2; After receiving the ATM-AIS packet, the ATM terminal system 2 confirms that the ATM terminal system 1 is faulty, and generates a backward alarm message, that is, an ATM-RDI (Remote Defect Indication Remote Fault Indication) message, and the ATM- The RDI message is sent to the ME of the ATM terminal system 1.

When the ATM-AIS or ATM-RDI packet traverses the Ethernet network, the encapsulation/de-encapsulation process is required. That is, the ATM terminal system 1 sends an ATM-AIS packet to the ATM terminal system 2 during the IWF (Inter- Working). Function, interworking function) Unit 1 encapsulates ATM-AIS packets according to the format defined by FATE. After the encapsulated ATM-AIS packets traverse the Ethernet network, they are decapsulated into ATM-AIS packets at IWF unit 2; When the terminal system 1 sends an ATM-RDI packet to the ATM terminal system 1, the ATM-RDI packet is encapsulated in the format defined by the FATE at the IF unit 2, and the encapsulated ATM-RDI packet traverses the Ethernet. After the network, it is decapsulated into an ATM-RDI message at IWF unit 1.

Similarly, when an alarm occurs on a device in the current Ethernet network, the alarm information can also communicate with each other on the Ethernet network.

However, there is currently no implementation mechanism for OAM (Operation and Maintenance) interworking functions in Ethernet and ATM interworking networks. Therefore, in order to improve the fault handling mechanism when Ethernet carries ATM services and improve the operational maintainability of the network, establishing an end-to-end OAM mechanism in Ethernet and ATM interworking networks is the next step that must be solved. Summary of the invention

In view of the above problems in the prior art, the object of the present invention is to provide a method, a system, and a network device for implementing operation and maintenance in a network, which ensures that the implementation of the OAM interworking function when the Ethernet is used as the bearer network to carry the ATM service is beneficial to the implementation. The ATM system carries out OAM work to speed up the troubleshooting process.

The object of the invention is achieved by the following technical solutions:

The present invention provides an implementation method for operation and maintenance in a network, including:

In the interworking network system of the Ethernet and the asynchronous transmission mode ATM, when it is confirmed that the Ethernet system is faulty, the fault message carrying the fault information is notified to the ATM terminal system;

The ATM terminal system operates and maintains the OAM operation according to the received Ethernet system failure message.

The technical solution of the following method is an optional technical solution.

The step of confirming that the Ethernet system fails includes:

When the upstream interworking function IWF or the downstream IWF fault affects the OAM function of the Ethernet part of the IWF unit, the IWF unit confirms that the Ethernet virtual link Ethernet line is faulty; and/or when the Ethernet Line itself fails, the downstream IWF unit The maintenance entity ME of the Ethernet part detects that the Ethernet Line is in a fault state and confirms that the Ethernet Line has failed.

The step of confirming that the Ethernet system fails includes: When the link layer of the Ethernet line is faulty, the ME in the Ethernet sends the corresponding ETH-AIS packet to the downstream IWF unit. After receiving the packet, the ME of the Ethernet part of the IWF unit confirms that the Ethernet line is generated. malfunction.

The process of notifying the ATM terminal system includes:

When the IWF unit confirms that the Ethernet line is faulty, the corresponding ATM alarm indication signal is generated and sent to the downstream ATM terminal system.

The process of notifying the ATM terminal system specifically includes:

ME confirmation of the Ethernet part of the IWF unit, when the Ethernet line fails, the fault information is notified to the ME of the ATM part of the IWF;

After receiving the Ethernet Line fault information, the ME of the ATM part of the IWF unit generates the corresponding ATM-AIS packet and sends it to the ME sent to the downstream ATM terminal system.

The process of notifying the ATM terminal system further includes:

After receiving the ATM-AIS packet, the ME of the ATM terminal system sends an ATM remote fault indication ATM-RDI packet to the ME of the upstream ATM terminal system.

The invention also provides a system for implementing operation and maintenance in a network, comprising:

The Ethernet fault notification module notifies the OAM management module of the fault message carrying the fault information after confirming that the Ethernet system is faulty;

The OAM management module is configured in the ATM terminal system to perform OAM operations according to the received Ethernet system failure message.

The technical solution of the following system is an optional technical solution.

The Ethernet fault notification module includes: an Ethernet fault message notification submodule and an ATM-AIS message sending submodule, and the ME of the ATM terminal system includes an OAM management module;

The Ethernet fault message notification sub-module is set in the ME of the Ethernet part of the IWF unit, and after the failure of the Ethernet line is confirmed, the fault information is notified to the ATM-AIS packet sending sub-module; the ATM-AIS packet sending sub-module , is set in the ME of the ATM part of the IWF unit, and constructs the corresponding ATM-AIS message according to the received fault information of the Ethernet line and sends it to the next The OAM management module in the ME of the ATM terminal system.

The Ethernet fault notification module further includes: an ATM-RDI packet sending submodule; and the ME of the upstream ATM terminal system includes an OAM management module;

The ATM-RDI message sending sub-module is configured in the ME of the ATM terminal system, and constructs an ATM-RDI message according to the ATM-AIS message transmitted by the ATM-AIS message sending sub-module, and sends the corresponding ATM-RDI message to the ATM-AIS message. OAM management module in the ME of the upstream ATM terminal system.

Another implementation method for operation and maintenance in a network provided by the present invention includes:

In the interworking network system of the Ethernet and asynchronous transmission mode ATM, the IWF unit generates a corresponding ATM alarm indication signal message according to the information received by the IWF unit or according to the detection result, and generates an ATM alarm indication signal. Notification to the ATM terminal system;

The ATM terminal system performs an OAM operation according to the received ATM alarm indication signal packet. Optionally, the foregoing method includes:

The ME of the Ethernet part of the IWF unit determines that when the Ethernet line fails, the fault information is notified to the ME of the ATM part of the IWF unit;

After receiving the Ethernet Line fault information, the ME of the ATM part of the IWF unit generates a corresponding ATM alarm indication signal and sends it to the ME sent to the downstream ATM terminal system.

The invention also provides a network device based on the interworking function, wherein the network device is provided with: an Ethernet fault notification module, and after confirming that the Ethernet system fails, notifying the ATM terminal system of the fault message carrying the fault information, so that the ATM The terminal system can perform OAM operations according to the received Ethernet system failure message.

Optionally, the Ethernet fault notification module includes: an Ethernet fault message notification submodule, and an ATM-AIS packet sending submodule;

The Ethernet fault message notification sub-module is set in the ME of the Ethernet part of the IWF unit, and after confirming that the Ethernet line fails, notifying the ATM-AIS message sending sub-module;

The ATM-AIS message sending submodule is disposed in the ME of the ATM part of the IWF unit, The corresponding ATM-AIS message is constructed according to the received fault information message of the Ethernet line and sent to the downstream ATM terminal system. It can be seen from the technical solutions provided by the present invention that the method, system and network device according to the present invention have the following advantages:

1. The implementation of the OAM interworking function when the Ethernet is used as the bearer network 7 to carry the ATM service;

2. When the ATM service fails, the upper ATM network can timely determine the cause and location of the ATM service fault according to the received fault message of the lower layer Ethernet, which is beneficial to speed up the fault handling process and improve the OAM mechanism when the Ethernet carries the ATM service. , to improve the operational and maintainability of the network;

3. The technical solution of the present invention is simple and easy to implement, and can be well compatible with existing devices. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of networking of Ethernet and ATM services in the prior art;

2 is a schematic diagram of networking of Ethernet and ATM OAM according to an embodiment of the present invention; FIG. 3 is a flowchart of a method according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a system according to an embodiment of the present invention. Mode for carrying out the invention

When the Ethernet is used as the bearer network to carry the ATM service, the Ethernet or the ATM network is faulty, which causes the ATM service to generate alarms. In order to facilitate the judgment of the alarms generated by the ATM service and speed up the fault handling process, the lower-layer Ethernet bearer network needs to be faulty. , notify the faulty information to the upper ATM network as soon as possible.

The OAM interworking function model in the Ethernet and ATM networks of the present invention is consistent with the Ethernet and ATM service interworking model proposed in FATE, as shown in FIG. 2 . The ATM network is not aware of the existence of the Ethernet network between the ATM terminal systems, and runs the end-to-end OAM of the ATM network. Between the IWFs, To be aware of the existence of the Ethernet network, the OAM interworking function between the Ethernet and the ATM is required. The IWF is a functional entity that implements OAM interworking. On an Ethernet network, only the related entities of the Ethernet exist and do not care about the services or OAM functions carried.

In the OAM interworking model in the Ethernet and ATM networks shown in Figure 2, the following possible failures of the lower Ethernet bearer network are as follows:

1. Ethernet Line failure caused by the failure of the upstream IWF (ie IWF1)/downstream IWF (ie IWF2):

Second, the Ethernet Line itself has failed;

3. The link layer of the Ethernet Line is faulty.

The method of the present invention will be described in detail below with respect to the above three fault conditions in conjunction with the drawings.

The method of the present invention is shown in FIG. 3 and includes the following steps:

Step 31: M of the Ethernet part of IWF2 confirms that the Ethernet Line has failed. When the IWF1 fault affects the OAM function of the Ethernet part of the IWF1, the EAM function of the Ethernet part of the IWF1 does not work normally. The ETH-CC (Continuity check) packet in the IWF1 cannot be sent normally. The ME part of the Ethernet part of the IWF2 When the Ethernet line is faulty, it is confirmed that the Ethernet line is faulty. When the IWF2 fault affects the OAM function of the Ethernet part of the IWF2, the OAM function of the Ethernet part of the IWF2 does not work normally, and the ETH-CC packet sent by the IWF1 is not received. The ME of the Ethernet part of the IWF2 detects that the Ethernet Line is in a fault state, thereby confirming that the Ethernet Line has failed.

When the Ethernet line itself fails, the ME of the Ethernet part of the IWF2 does not receive the ETH-CC packet sent by the IWF1. The ME of the Ethernet part of the IWF2 detects that the Ethernet line is in the fault state, thus confirming that the Ethernet line is faulty.

When the link layer of the Ethernet line fails, the Ethernet OAM function entity generates the corresponding ETH-AIS packet and sends it to the IWF2. After receiving the packet, the ME of the Ethernet part of the IWF2 confirms that the Ethernet line is faulty. Step 32: After the ME of the Ethernet part of the IWF2 confirms that the Ethernet line has failed, notify the ME of the ATM part of the IWF2 of the Ethernet Line fault information.

Step 33: The ME of the ATM part of the IWF2 generates the corresponding ATM-AIS packet according to the fault notification of the Ethernet line.

Step 34: The ME of the ATM part of the IWF2 sends the ATM-AIS message to the ME of the ATM terminal system 2.

Step 35: After receiving the ATM-AIS packet, the ME of the ATM terminal system 2 generates the corresponding ATM-RDI packet and sends it to the ME of the ATM terminal system 1.

During the process of the ATM terminal system 2 transmitting the ATM-RDI packet to the ATM terminal system 1, the ATM-RDI packet is encapsulated in the format defined by the FATE at the IWF unit 2, and the encapsulated ATM-RDI packet traverses the Ethernet network. The IWF unit 1 is decapsulated into an ATM-RDI message.

Step 36: The ATM terminal system performs an OAM operation according to the received OAM alarm message (ATM-AIS or ATM-RDI message) about the Ethernet line.

For example, when the ATM service fails to generate alarm information, if the downstream ATM terminal system receives the corresponding Ethernet line OAM alarm message (ATM-AIS message), and the upstream ATM terminal system receives the corresponding Ethernet line OAM alarm. In the case of the message (ATM-RDI packet), the ATM terminal system can determine that the ATM service failure is caused by the Ethernet Line failure, and the ATM network system is faulty, and the Ethernet is determined according to the information carried in the OAM alarm message. The location of the Line fault, which speeds up the troubleshooting process.

In the Ethernet and ATM interworking network model shown in Figure 1, other faults may occur, such as faults in the upstream/downstream ATM network, upstream IWF1 failures but not affecting the functions of the Ethernet Line, and downstream IWF2 failures but not affecting The function of the Ethernet Line, etc. When these faults occur, it is only necessary to notify the fault according to the existing standards and protocols. The following describes the fault notification process when these faults occur:

When the upstream (ie, ATM terminal system 1) fails, the ME in the ATM terminal system 1 Generate a forward alarm message, that is, an ATM-AIS message, and send the message to the ME of the ATM terminal system 2; when the ME of the ATM terminal system 2 receives the ATM-AIS message, confirm the ATM terminal system 1 A fault occurs, and a backward alarm message, that is, an ATM-RDI message, is sent, and the ATM-RDI message is sent to the ME of the ATM terminal system 1.

When the ATM-AIS or ATM-RDI packet traverses the Ethernet network, the encapsulation/de-encapsulation process is required. In the process of the ATM terminal system 1 transmitting the ATM-AIS packet to the TM terminal system 2, the IWF unit 1 is based on The format defined by the FATE encapsulates the ATM-AIS packet. After the encapsulated ATM-AIS packet traverses the Ethernet network, it is decapsulated into an ATM-AIS packet at the IWF unit 2. Similarly, the ATM terminal system 2 sends the ATM terminal system 2 to the ATM terminal system 1. In the process of the ATM-RDI packet, the ATM-RDI packet is encapsulated in the IWF unit 2 according to the format defined by the FATE. After the encapsulated ATM-RDI packet traverses the Ethernet network, the encapsulated ATM-RDI is encapsulated in the IWF unit 1. Message.

When the ATM terminal system 2 fails, the ME in the ATM terminal system 2 generates an ATM-RDI message and sends the message to the ME of the ATM terminal system 1, when the ATM terminal system 1 receives the ATM-RDI message. , Confirm that the ATM terminal system 2 has failed.

When the upstream IWF1 fails but does not affect the Ethernet Line function, and when the downstream IWF2 fails but does not affect the Ethernet Line function, the ATM terminal system 2 will not receive the ATM-CC packet sent by the upstream ATM terminal system 1, and the ATM terminal. The system 2 enters a fault state, and the ME of the ATM terminal system 2 generates a corresponding ATM-RDI message and transmits it to the ME of the ATM terminal system 1.

The present invention also provides a system for implementing OAM in a network. As shown in FIG. 4, the system includes: an Ethernet fault notification module and an OAM management module;

The operation of the Ethernet fault notification module is to notify the OAM management module of the fault message carrying the fault information when it is confirmed that the Ethernet system is faulty.

The OAM management module is configured in the ATM terminal system, and performs operations of: performing OAM operations according to the received Ethernet system failure message. The Ethernet fault notification module is composed of an Ethernet fault message notification submodule and an ATM-AIS packet sending submodule; and an OAM management module is set in the ME of the downstream ATM terminal system; the Ethernet fault message notification submodule is set downstream The ME in the Ethernet part of the IWF unit performs the following operations: When it is confirmed that the Ethernet line is faulty, the fault information is notified to the ATM-AIS message sending submodule.

The ATM-AIS packet sending sub-module is disposed in the ME of the ATM part of the downstream IWF unit, and performs the operation of constructing the corresponding ATM-AIS packet according to the received Ethernet Line fault information, and transmitting the corresponding ATM-AIS packet to the downstream ATM terminal system. OAM management module in the ME.

On the basis of the foregoing system, the Ethernet fault notification module further includes: an ATM-RDI packet sending sub-module; and an OAM management module is disposed in the ME of the upstream ATM terminal system;

The ATM-RDI packet sending sub-module is set in the ME of the downstream ATM terminal system, and the operation is: constructing the corresponding ATM-RDI packet according to the ATM-AIS packet transmitted by the ATM-AIS packet sending sub-module, and The OAM management module in the ME sent to the upstream ATM terminal system.

On the basis of the above system, in order to better compatible with the prior art, the system further includes: an ATM fault notification module, which is disposed in the ME of the ATM terminal system, and performs the operations as: when detecting that the ATM terminal system is in a fault state The fault message is notified to the OAM management module.

The ATM fault notification module is composed of an upstream ATM terminal system failure notification sub-module and a downstream ATM terminal system failure notification sub-module.

The upstream ATM terminal system fault notification sub-module is set in the ME of the upstream ATM terminal system, and the operation is: when the upstream ATM terminal system is detected to be in a fault state, the corresponding ATM-AIS packet is configured and sent to the downstream. OAM management module of ATM terminal system.

The downstream ATM terminal system fault notification sub-module is disposed in the ME of the downstream ATM terminal system, and performs the following operations: when detecting that the downstream ATM terminal system is in a fault state, constructing a corresponding ATM-RDI packet and transmitting the corresponding ATM-RDI packet to the upstream ATM terminal The OAM management module of the system.

The OAM management module in the system also performs the following operations: Perform OAM operations according to the received OAM alarm message (ATM-AIS or ATM-RDI message) about the ATM terminal system. Based on the above-mentioned system for implementing the OAM interworking function in the network, when Ethernet is used as the backbone network to carry the ATM service, the fault notification process can be completed under various fault conditions, ensuring the end-to-end OAM implementation mechanism between the Ethernet and the ATM network. Conducive to speed up the troubleshooting process. The interworking function-based network device provided by the present invention is as described in the above system.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A method for implementing operation and maintenance in a network, comprising:

2. The method according to claim 1, wherein the step of confirming that the Ethernet system is faulty comprises:

3. The method according to claim 1, wherein the step of confirming that the Ethernet system is faulty comprises:

When the link layer of the Ethernet line is faulty, the ME in the Ethernet sends the corresponding ETH-AIS packet to the downstream IWF unit. After receiving the packet, the ME of the Ethernet part of the IWF unit confirms that the Ethernet line is generated. malfunction.

The method according to claim 1, 2 or 3, wherein the process of notifying the ATM terminal system comprises:

The method according to claim 4, wherein the process of notifying the ATM terminal system specifically includes:

ME confirmation of the Ethernet part of the IWF unit, when the Ethernet line fails, the fault information is notified to the ME of the ATM part of the I WF;

The ME of the ATM part of the IWF unit receives the Ethernet Line fault information and generates the corresponding The ATM-AIS message is sent to the ME sent to the downstream ATM terminal system.

The method according to claim 4, wherein the process of notifying the ATM terminal system further includes:

7. A system for implementing operation and maintenance in a network, comprising:

The system according to claim 7, wherein the Ethernet fault notification module comprises: an Ethernet fault message notification sub-module and an ATM-AIS message transmission sub-module, and the ME of the ATM terminal system includes O AM management module;

The Ethernet fault message notification sub-module is set in the ME of the Ethernet part of the IWF unit, and after confirming that the Ethernet line fails, notifying the fault information to the ATM-AIS message sending sub-module;

The ATM-AIS message sending sub-module is disposed in the ME of the ATM part of the IWF unit, and constructs a corresponding ATM-AIS message according to the received fault information of the Ethernet line and sends the OAM in the ME of the downstream ATM terminal system. Management module.

The system according to claim 8, wherein the Ethernet fault notification module further comprises: an ATM-RDI message sending sub-module; and the ME of the upstream ATM terminal system includes an OAM management module;

The ATM-RDI message sending sub-module is set in the ME of the ATM terminal system, and the corresponding ATM-RDI message is constructed according to the ATM-AIS message transmitted by the ATM-AIS message sending sub-module, and sent to OAM management module in the ME of the upstream ATM terminal system.

A method for implementing operation and maintenance in a network, comprising:

17. In the interworking network system of the Ethernet and asynchronous transmission mode ATM, the IWF unit generates a corresponding ATM alarm indication signal message according to the information received by the IWF unit or according to the detection result, and generates an ATM alarm indication signal. The message is notified to the ATM terminal system, and the ATM terminal system performs an OAM operation according to the received ATM alarm indication signal message.

The method according to claim 10, wherein the method comprises:

The ME of the ATM part of the IWF unit receives the Ethernet Line fault information and generates the corresponding

The ATM alarm indicates a signal message and sends it to the ME that is sent to the downstream ATM terminal system.

12. A network device based on the interworking function, characterized in that: the network device is provided with: an Ethernet fault notification module, and after confirming that the Ethernet system fails, notifying the ATM terminal system of a fault message carrying the fault information. , enables the ATM terminal system to perform OAM operations according to the received Ethernet system failure message.

The network device according to claim 12, wherein the Ethernet fault notification module comprises: an Ethernet fault message notification sub-module, an ATM-AIS packet transmission sub-module; and the Ethernet fault message notification sub- The module is set in the ME of the Ethernet part of the IWF unit, and after confirming that the Ethernet line is faulty, notifying the ATM-AIS message sending sub-module after the failure of the Ethernet line;

The ATM-AIS packet sending sub-module is set in the ME of the ATM part of the IWF unit, and the corresponding ATM-AIS packet is constructed according to the received Ethernet Line fault information message and sent to the downstream ATM terminal system.