WO2007028313A1

WO2007028313A1 - A remote management method of onu in epon system

Info

Publication number: WO2007028313A1
Application number: PCT/CN2006/002011
Authority: WO
Inventors: Jinshu Lu; Yunpeng Xie; Huannan Ma; Meiling Tang; Jinhui Yu
Original assignee: Zte Corporation
Priority date: 2005-09-07
Filing date: 2006-08-09
Publication date: 2007-03-15
Also published as: CN1929394A; CN100454835C

Abstract

A remote management method of ONU in EPON system includes: it manages ONU by the expanding of the present standard OAM frame; it manages the objects using the standard MIB; AGENT receives the SNMP packet on the devices of OLT side; it analyzes all the MIB objects; if a certain object is used to manage a certain ONU, it packets the object into the OAM frame and transmits it to the corresponding ONU; on ONU side, it analyzes the object of the frame, operates ONU, and returns the response frame to OLT. The present invention implements the unified management of ONU, and saves the plentiful IP address resource so as to implement the unified management between the different manufacturer devices.

Description

Optical network unit remote management method in Ethernet passive optical network system

Technical field

The present invention provides a remote management method for an ONU (Optical Network Unit), and more particularly to a remote management method for an ONU in an EPON (Ethernet Passive Optical Network) system in the communication field.

Background technique

In ADSL (Asymmetric Digital Subscriber Loop), for terminal MODEM (modem) management, the usual implementation method is to directly manage through the local serial port, or set an IP address to the MODEM, and then through WEB (network) mode or TELNET ( Remote login) login for management.

At present, for the management of ONUs in EPON systems, many manufacturers adopt the same measures as MODEM management in ADSL. They use CLI (command line interface) to implement ONU management through serial port or TELNET; or through WEB or SNMP. (Simple Network Management Protocol) to manage the ONU. Some of the manufacturers support one of the management methods, while others support all management methods.

For the TELNET mode, the WEB mode, and the SNMP mode, each ONU must be assigned an IP address to implement management of the ONU. One OLT (optical line terminal) has multiple ONUs (1:16, 1:32, 1:64, 1:128, etc.).

Because the SNMP protocol is simple, easy to use, and fast, it is a common industry standard. It can use the network management system that supports the SNMP standard to manage devices from different vendors to implement unified network management. Therefore, more and more manufacturers support SNMP. the way.

PON (Passive Optical Network) technology is a point-to-multipoint fiber access technology consisting of the OLT on the office side, the ONU on the user side, and the ODN (Optical Distribution Network). Generally, the downlink adopts TDM (Time Division Multiplex) broadcast mode, and the uplink adopts TDMA (Time Division Multiple Access) mode, and can flexibly form a topology structure such as a tree type, a star type, and a bus type (a typical structure is a tree structure). .

Since EPON equipment combines the advantages of PON and Ethernet, the system structure is simplified, the standard is loose, and the cost is lower, so EPON equipment will be more and more applied. This involves the management of the EPON system. Since the EPON system is a new service application mode, an OLT and multiple ONUs form a relatively independent EPON system. For the management of this EPON system, it can be regarded as a management. The system looks at (0LT and all ONUs), and can also be treated as multiple independent management systems. The OLT is an independent management system, and the other 0 U are separate management systems.

In the EPON system management standard, there is no definition of how to manage the ONU under the OLT. Only the acquisition of some variable values is defined, and the management of the ONU cannot be completed. The management of the ONU is implemented by various manufacturers. If you want to achieve unified network management, using SNMP will be a wise choice.

However, due to the characteristics of the EPON system, there will be multiple ONUs under one OLT. If the usual SNMP practices are adopted, each ONU implements an AGENT (network management agent), which directly sends the network management information to the ONU, which will take up a lot of The IP address is a huge waste for both the public and private IP addresses.

For example, according to the traditional SNMP practice, each ONU implements a standard SNMP AGENT. Each ONU needs to be assigned an IP address, and management data is sent directly from the network management to the 0NU. Thus, if there are N OLTs on the device at the OLT and M ONUs under each OLT, the IP address required by the traditional method should be 1 (manage the IP address of the device at the OLT) + NXM (manage the ONU device) IP address).

In addition, the current standard has very weak management support for ONUs. Only some variable requests and variable responses are defined, that is, only the values of some MIB (Management Information Base) variables can be obtained, and only the management information represented by SNMP to managed objects is supported. Read operations cannot support other operations and cannot be configured and managed.

Summary of the invention

The technical problem to be solved by the present invention is to provide a remote management method for a terminal device in an EPON system, and perform unified management on the network through standard SNMP. The invention provides a remote management method for an optical network unit in an Ethernet passive optical network system, comprising the following steps:

The network management unit sends a simple network management protocol request packet to the optical line terminal device, where the request packet is in the request packet Containing management information and an optical network unit number to be managed by the management information;

On the optical line terminal side device, the protocol request packet received by the simple network management protocol agent is parsed into a plurality of management information base objects, and the management information of the remote optical network unit operations under the jurisdiction is determined. Library object

The optical line terminal requests the optical network unit number carried by the packet according to the protocol, and checks whether the optical network unit under the jurisdiction supports remote management. If supported, the management information database object and its attributes are encapsulated into an operation and maintenance management frame, and sent. To the optical network unit;

The optical network unit parses the received operation and maintenance management frame, extracts a management information base object therefrom, and determines to support the extracted management information base object;

The optical network unit locally implements the operation of the management information base object, and sends back a management response frame to the optical line terminal to which it belongs, which carries the result returned by the actual operation;

The optical line terminal returns the result of the actual operation back to the network management unit in a simple network management protocol response packet.

Further, the remote management method may further include the following steps:

On the optical line terminal side, an operation and maintenance management frame is assembled by the optical line terminal and sent to the optical network unit under its jurisdiction, and the optical network unit is required to confirm whether to support remote management;

The optical network unit sends back a response frame to the optical line terminal according to whether it supports remote management, and carries confirmation information about whether it is supported;

The optical line terminal parses the received response frame, confirms and records whether the optical network unit supports remote management.

Further, the remote management method may further include the following steps:

When the optical network unit detects that an abnormality occurs in itself, the abnormal information is encapsulated into an operation and maintenance management frame and sent to the optical line terminal to which it belongs;

The optical line terminal converts the information in the received operation and maintenance management frame into a simple network management protocol trap packet and reports it to the network management unit.

The invention realizes unified management of all OJs of the OLT and the lower band thereof, and saves a large number of IP address resources. Since the SNMP protocol is used for management on the OLT side, the ONU can pass The simple AGENT responds to the management request on the OLT side and supports any standard MIB object management. The SNMP and MIB objects are standard, which facilitates the unified management of devices between different manufacturers. It is also possible for the network management to achieve unified management and to easily expand the new functions. BRIEF abstract

1 is a diagram of a framework of the entire management according to an embodiment of the present invention;

2 is a flowchart of implementing ONU remote management on the OLT side device to determine whether the ONU supports ONU remote management according to an embodiment of the present invention;

FIG. 3 is a flowchart of an operation of implementing an MIB object for realizing remote ONU on an OLT side device according to an embodiment of the present invention;

FIG. 4 is a flowchart of an exception processing for implementing remote ONU reporting on an OLT side device according to an embodiment of the present invention;

FIG. 5 is a flowchart of implementing ONU remote management on the ONU side device in response to the OLT confirming whether the ONU itself supports ONU remote management according to an embodiment of the present invention;

6 is a flowchart of implementing ONU remote management to implement MIB object processing on an ONU side device according to an embodiment of the present invention;

7 is a flowchart of implementing local abnormal reporting processing on an ONU side device by using ONU remote management according to an embodiment of the present invention;

8 is a schematic structural diagram of a specific OAMPDU frame in an existing standard;

FIG. 9 is a schematic diagram of a data field format in a specific OAMPDU frame structure in a Branch/Leaf mode;

FIG. 10 is a schematic diagram of a data field format in a specific OAMPDU frame structure in an MIB manner. Preferred embodiment of the invention

The invention adopts an OAM frame based on the SNMP protocol and the EPON standard to manage the ONU. Extending the existing standard OAM or extending OAM's Organization Specific Maintenance OAMPDU, Organization Specific Integration TLV, and Organization Specific Event TLV Manage ONU devices. The invention adopts a standard MIB management object, implements SNMP AGENT on the device on the OLT side, and when the AGENT receives the SNMP packet, parses all MIB objects. If a MIB object manages an OU, it will The MIB object is encapsulated in an OAM frame and sent to the corresponding ONU. On the ONU side, it is processed by a simple AGENT on the ONU side. If an OAM frame processed for the MIB object is received, the MIB object is immediately parsed, and then the ONU is operated. The response OAM frame is then sent back to the OLT.

Because the invention sends all management information of the network management to the OLT first, and then is forwarded by the OLT to the ONU through the OAM. In this way, only one IP address is required. In the operation data of all the management information, there is specifically the ONU under the OLT, which can be known according to the data sent by the network management.

For example, the device (or the network element, the ONU, and the ONU as another independent device) of the present invention has multiple OLT line cards, and each line card has multiple OLTs, and each OLT is "hanged". One ONU, assuming there are 5 OLT line cards, there are 4 OLTs on each line card, and there are 32 ONUs under each OLT. The OLT number is from 1-20, ONU number 1/1-1/32, 2/1-2/32, ..., 20/1-20/32, for IP address, only one device and the ONU below need only One (otherwise using the traditional method will require 1 + 5 x 4 x 32 = 641 IP addresses), in the management, such as the need to manage the ONU 20 under the OLT 10, then the network management will need to manage the information along with the OLT and The ONU number is sent to the device together, that is, it needs to indicate the operation of an ONU under that OLT. After receiving the information, the device converts the information into a specified format, encapsulates it into an OAM frame, and then sends an OAM frame to the ONU. That is to say, when the network management and the OLT device transmit the management information, it is necessary to indicate which ONU is currently operated by the OLT, and the OLT device can further remove the OLT and ONU information, and directly transmit the management information with the ONU.

The SNMP AGENT working process on the OLT side is as follows:

When an ONU registration is successful, a "inquiry OAM frame" is sent, and the ONU is required to confirm whether it supports remote management, which is called 'ONU remote management control OAM frame,;

AGENT parses the received SNMP protocol packets and decomposes them into a single one. MIB object;

If a MIB object is a management operation for an ONU, first check whether the ONU supports ONU remote management. If not, return an ONU remote management code to the NMS in the SNMP response packet; if supported, The attribute of the MIB object is encapsulated into an OAM frame, and the OAM frame is sent, which is called "ONU remote management data OAM frame"; its attribute may be an OID (object identifier definition) of the MIB object, or a other unique identifier, such as EPON. The corresponding leaf node in the tree in the standard, or the operation type, such as directly reading the management information value of the managed object, reading the value of the management information of the next managed object, and writing the management information of the managed object Operation, or the value of the MIB object and its length, etc.;

Waiting for the response of the ONU to the 'ONU remote management data OAM frame', if the response times out, return a waiting for 'OU remote management data OAM frame' response timeout code to the network management in the SNMP response packet; otherwise, the actual information of the ONU response ( Success or failure, etc.) into the SNMP response packet;

The AGENT on the OLT sends an SNMP response to the NMS.

The SNMP AGENT on the OLT side can also process the "ONU remote management TRAP OAM frame" sent by the ONU, convert it into a standard SNMP TRAP packet and report it to the NMS, and then send a response OAM frame to the ONU, which is called ' The ONU remotely manages the TRAP response OAM frame."

The ONU side does not need to process the SNMP protocol, only processes the MIB object, responds to the 'ONU remote management control OAM frame' and 'ONU remote management data OAM frame' sent by the OLT side through a simple AGENT, and can actively send a ' ONU remotely manages TRAP OAM frames."

The ONU side AGENT processes the received ONU remote management control OAM frame sent by the OLT, and returns whether the ONU remote management OAM frame is currently supported, which is called 'ONU remote management control response OAM frame'.

The ONU side AGENT processes the received 'ONU remote management data OAM frame' sent by the OLT, parses the frame, completes the specific operation of the ONU according to the MIB object, and encapsulates the operation result into the OAM frame and sends it back to the OLT. It is called 'ONU Remote Management Data Response OAM Frame'. If an abnormality occurs locally in the ONU, such as an alarm, the AGENT on the OU side encapsulates the relevant information into the OAM frame and immediately sends it to the OLT, which is called 'ONU Remote Management TRAP OAM Frame'.

As shown in Figure 1, the framework diagram for managing the entire EPON system. Management messages (such as SNMP request packets) can be initiated from the NMS or SNMP MANAGER (step 101). After receiving the OLT, the OLT can analyze the processing and directly respond to the local operation of the OLT, such as directly sending back SNMP response packets. 102), it is also possible to encapsulate the message into the OAM frame and send it to the ONU (step 103). The ONU side is simply sent to the OLT through the OAM frame after the simple AGENT receiving process (step 104), and the OLT side AGENT re-analyzes and processes the response to the network management operation. The SNMP response packet is sent back (step 105); the management message may also be initiated at the OLT, and the remote control management frame is sent to the ONU (step 106), asking whether the ONU supports remote management, and the ONU can support the response to the OLT, and return the OAM frame (step 107). The special message can also be initiated at the ONU, such as an exception message. The ONU sends an OAM frame of the exception message to the OLT side (step 108). After the OLT analyzes the processing, the message is sent to the network management system, for example, by using the SNMP TRAP method. Network management (step 109).

The flowchart shown in Figure 2 is used by the OLT to confirm to the ONU whether remote management of the ONU is supported. After the registration is successful, it is sent to the ONU.

First, an OAM frame is assembled at the OLT for querying whether an ONU supports ONU remote management, and then sends an 'ONU remote management control OAM frame to the ONU, (step 201); setting a timer and a counter, waiting The response of the ONU, if the OAM frame of the ONU has not been received after the timer expires, the "ONU Remote Management Control OAM Frame" is sent again (step 202); it is determined whether the OAM response frame of the ONU is received within the maximum counting range ( Step 203); if the response frame of the ONU has not been received for a certain number of times, it is determined that the ONU does not support the ONU remote management, and the ONU does not support the ONU remote management (step 207); if the response frame of the ONU is received, the resolution is resolved. Receiving the 'ONU remote management control response OAM frame' (step 204), determining that the ONU supports remote management (step 205); if supported, saving the ONU to support ONU remote management (step 206); if parsing, confirming the ONU If remote management is not supported, saving the ONU does not support ONU remote management (step 208). As shown in Figure 3, the flow chart of the SNMP request operation delivered by the MANAGER is processed.

After the SNMP request is sent by the MANAGER (step 301), the AGENT of the OLT side first parses the SNMP request sent by the MANAGER (step 302), decomposes into an independent MIB object, and then analyzes each MIB object in turn (step 303). And determining whether each MIB object is an operation on the remote ONU (step 304), if not, processing locally (step 310), if it is checking whether the ONU supports remote management (step 305), if not supported Then return to MANAGER - an ONU does not support the remote management code; if supported, the attributes of the MIB object are encapsulated into an OAM frame (one or more MIB objects can be encapsulated at the same time) (step 306), and then the OAM frame is delivered The 'ONU remote management data OAM frame' of the message (step 307), start a timer (step 308), and if the timer has not timed out yet received the response of the ONU, return to the MANAGER-ONU response timeout code (step 312) Otherwise, the response frame of the ONU is processed (step 309), and the response information is returned to the MANAGER (step 313).

As shown in Figure 4, the information flow chart for handling the abnormality of the ONU is processed.

After receiving the OAM frame of the abnormality information reported by the ONU, that is, the 'ONU remote management TRAP OAM frame' (step 401), the information in the OAM frame is converted into the information required for the SNMP TRAP message, and a standard SNMP TRAP message is assembled. Send to MANAGER (step 402).

As shown in Figure 5, the ONU responds to the OLT to confirm whether the ONU supports the remote management response flow graph.

Whenever the ONU receives the "ONU remote management control OAM frame, (step 501), confirm whether it supports remote management itself (step 502), if supported, the assembled ONU supports the ONU remote management OAM frame (step 503); If not supported, the constituent ONUs do not support the ONU remote management of the OAM frame (step 504), and then return the actual result to the OLT via the "ONU Remote Management Control Response OAM Frame" (step 505).

As shown in Figure 6, the ONU side processes the MIB objects in the OAM frame.

Receiving the 'ONU remote management data OAM frame sent by the OLT, and then (step 601), parsing the OAM frame, extracting all MIB objects (step 602), and then processing sequentially, first Determining whether the ONU supports the MIB objects (step 603). If not, directly returning the "ONU remote management data response OAM frame, and giving the OLT, carrying information that does not support the MIB object (step 605); if supported, locally The operation on the MIB object is implemented (step 604), and then the 'ONU remote management data response OAM frame is sent back to the OLT, carrying the result returned during the actual operation (step 606).

As shown in Figure 7, the ONU is handled abnormally locally.

If the ONU itself detects that an abnormality has occurred (step 701), the related information of the abnormality is encapsulated into an OAM frame (step 702), and the 'ONU remote management TRAP OAM frame' is sent to the OLT (step 703), and the ONU is locally reported. The abnormal situation.

The manner of expanding and encapsulating the OAM frame described in the present invention can be further described with reference to FIGS. 8, 9, and 10.

As shown in FIG. 8, the OAMPDU frame format of a specific organization defined in the existing standard, according to the present invention, the management information of the ONU may be encapsulated into a Data field according to a certain format, for example, as shown in FIG. 9 or FIG. The format used.

As shown in Figure 9, an ONU remote management method is used, and the format in the Data data field is used.

among them:

1. OUI is the unique identifier of the supplier, 3 bytes;

2, Code is the opcode, 1 byte, for example, to indicate that the current operation is to set / get the request / response;

3. Type is the operation type, 1 byte. For example, it can indicate which attribute is currently operated, such as Ethernet port or CATV port.

4, Port is the port number, 1 byte, such as Ethernet port 1, 2, etc.;

5. The Variable Container is a variable carried in the OAM frame, and a branch/leaf corresponds to an MIB object (for each of the corresponding standard standards that do not exist);

6, Width and Value are consistent with the definition in the standard;

As shown in FIG. 10, another ONU remote management method is adopted, and the DATA data field is used. The format in .

among them:

1. OUI is the unique identifier of the supplier, 3 bytes;

2, Code is an operation code, 1 byte, for example, used to indicate the SNMP operation issued by the current network management, for example, as shown in the following table;

3. The MIB Variable Container is a MIB object carried in an OAM frame, and an object corresponds to a MIB Variable Container, and the length is indefinite, including an OID (object identifier definition) width, MIB OID, Width, and Value; wherein the OID width is MIB OID Length, each node in the OID is represented by 2 bytes; MIB OID is the identifier of the MIB object (or index if it is not a scalar); for example, a MIB object is: 1.3.6.1.4.1.3902.1012.2.3 .3.1 , Bay ' J OID width is 0x18 ( 12 χ 2=24 ) , MIB OID is 0x0001— 0003— 0006— 0001— 0004— 0001— 0Be—03f4— 0002— 0003— 0003— 0001; Width and Value are the same as standard The definitions are the same.

The above manners are merely exemplary and are not intended to limit the invention, and those skilled in the art will appreciate that other variations are also possible. Industrial applicability For the characteristics of multiple ONUs in an OLT in an EPON system, if the normal SNMP method is adopted, each ONU implements an AGENT (network management agent) to directly send the network management information to the ONU, which will occupy a large number of IP addresses. It is a huge waste for both the public and private IP addresses. The invention realizes unified management of the optical network unit and saves a large amount of IP address resources. Because the SNMP protocol is used on the OLT to support any standard MIB object management, the SNMP and MIB objects are standard. This facilitates unified management of devices between different vendors. When services are interconnected, the NMS is managed. It is also possible to achieve unified management and easy expansion of new features.

Claims

Claim

A remote management method for an optical network unit in an Ethernet passive optical network system, the Ethernet passive optical network system comprising a network management unit supporting a simple network management protocol standard, at least one optical line terminal and its underlying A plurality of optical network units, wherein the method comprises the following steps:

The network management unit sends a simple network management protocol request packet to the optical line terminal device, where the request packet includes management information and an optical network unit number to be managed by the management information;

On the optical line terminal side device, the received protocol request packet is parsed into a plurality of management information base objects by a simple network management protocol proxy, and management information of the remote optical network unit operations under its jurisdiction is determined therein. Library object

The optical line terminal returns the result of the actual operation back to the network management unit in a simple network management protocol response packet. '

2. The method according to claim 1, further comprising the steps of: assembling an operation and maintenance management frame by the optical line terminal to the optical network unit under the optical line terminal on the optical line terminal side, requesting the optical network The unit confirms whether remote management is supported;

3. The method according to claim 1, further comprising the steps of: When the optical network unit detects that an abnormality occurs in itself, the abnormal information is encapsulated into an operation and maintenance management frame and sent to the optical line terminal to which it belongs;

The method according to claim 1, wherein the optical line terminal determines, from the parsed plurality of management information base objects, a management information base object operation for the remote optical network unit under its jurisdiction, The management information base object that is not operating on the remote optical network unit is processed locally by the optical line terminal.

The method according to claim 1, wherein the optical line terminal checks whether the optical network unit under its jurisdiction supports a remote management step, and if not, returns to the network management unit that an optical network unit does not support Remote management code.

The method of claim 1, wherein the optical line terminal encapsulates the management information base object and its attributes into an operation and maintenance management frame and sends the method to the optical network unit, and further includes the following steps:

A timer is started. If the response of the optical network unit has not been received after the timer expires, an optical network unit response timeout code is returned to the network management unit.

7. The method according to claim 1, wherein the step of encapsulating the management information library object and its attributes into an operation and maintenance management frame by the optical line terminal is to extend the management frame by standard operation and maintenance. Or extend the component operation and maintenance management protocol data unit, component message type length value, and component event type length value for encapsulation.

8. The method according to claim 1, wherein the optical network unit parses the received operation and maintenance management frame, extracts a management information base object therefrom, and determines to support the extracted management information database object. Step: If the optical network unit does not support the extracted management information base object, directly send a response frame to the optical line terminal, where the information that does not support the management information base object is carried.

The method according to claim 2, wherein the step of assembling an operation and maintenance management frame of a format by the optical line terminal to the optical network unit under its control further comprises the following steps: Setting a timer and a counter, waiting for the response of the optical network unit, if the response has not been received after the timer expires, sending the operation and maintenance management frame again, and continuing to request the optical network unit to confirm whether to support remote management, and The timer is reset and the counter is incremented by one; if the counter has not received the response of the optical network unit after reaching the predetermined number of times, it is determined that the optical network unit does not support remote management.

The method of claim 3, wherein the step of converting the information in the received operation and maintenance management frame into the simple network management protocol trap packet and reporting the packet to the network management unit further comprises the following steps:

The optical line terminal sends a response frame to the optical network unit, where the message carrying the successful report is carried.