WO2017177619A1 - Sdn/nfv open access network system, and method and device for managing onu - Google Patents

Abstract

An SDN/NFV open access network system, comprising a virtual optical line terminal (vOLT), an access network device with an Openflow switching capability, and an ONU, wherein the vOLT and the access network device are interconnected by means of an Openflow switching network; the access network device and the ONU are interconnected by means of an optical distribution network (ODN). Also disclosed is a method for an SDN/NFV open access network system to manage an ONU. By combining an OVS network of the SDN and the conventional ONU management, the primary ODN network architecture can be fully used, and the management process of configuring, maintaining, and updating the ONU is simplified.

Description

SDN/NFV open access network system and method and device for managing ONU Technical field

This application relates to, but is not limited to, the field of communication technology.

Background technique

In the traditional access network, the network management system (EMS, Optical Management Terminal) and the optical line terminal (OLT) can provide optical network unit management and control interface (OMCI, ONU Management and Control Interface) management. Graphical interface. As a new type of network architecture, Software Defined Network (SDN) is an open and programmable network architecture by decoupling network control and network forwarding. SDN abstracts the network to shield the underlying complexity and provides simple and efficient configuration and management for the network. For the access network, the network above the access network OLT will face an increasingly wide-ranging SDN/Network Function Virtualization (NFV) trend, providing an OpenFlow-based forwarding mechanism and OpenFlow Virtual Switch (OVS, OpenFlow Virtual Switch).

Passive Optical Network (PON) eliminates the active equipment between the central office and the client, making maintenance simple, reliable, and low-cost. At the same time, PON is also very valuable as a network that is closest to the user under the trend of SDN/NFV because of its wide coverage and high-density connection to the Optical Network Unit (ONU). The industry's discussion on how to build a new open access network for SDN/NFV continues. In addition, because the optical distribution network (ODN) connected to the OLT and the traditional ONU is mature, and the site is fixed, the SDN/NFV transformation cost is high, and therefore, the PON network cannot be simply replaced and replaced by the OVS. In other words, traditional ONU management still has strong vitality even in SDN/NFV networks.

Therefore, a new network structure and communication management method is needed, which can combine the SDN OVS network with the traditional ONU management, on the one hand, adapt to the future SDN requirements, and on the other hand, can take advantage of the traditional ONU management. It can save costs and improve efficiency when transforming the network structure.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a software-defined network SDN/network function virtualization NFV open access network system, which comprises: a virtual optical line terminal vOLT, an access network device with OpenFlow Openflow switching capability, and an optical network unit. ONU; among them,

The vOLT communicates with the access network device through an OpenFlow switching network; the access network device communicates with the ONU through an optical distribution network ODN.

Optionally,

The vOLT includes an optical network unit management control interface OMCI management module, and the OMCI management module is configured to encapsulate the OMCI original message into a management data frame through the southbound interface mapping, and send the OMCI original message to the access network device through the Openflow switching network. ;

The access network device with OpenFlow switching capability includes an SDN proxy, the SDN proxy includes an OMCI processing module, and the OMCI processing module is configured to: decapsulate the management data frame and re-encapsulate into an OMCI message, Sending the OMCI message to the ONU through an optical distribution network ODN;

The ONU includes an OMCI proxy configured to receive the OMCI message and perform OMCI configuration.

Optionally,

The OMCI management module of the vOLT is configured to encapsulate the OMCI original message map into a management data frame by using an OpenFlow management and configuring an OF-Config protocol or a network configuration Netconf protocol.

Optionally,

The OMCI management module of the vOLT is configured to encapsulate the OMCI original message mapping into a management data frame by extending the OF-Config protocol or the negotiated data channel model NDM of the Netconf protocol.

Optionally,

The access network device with the OpenFlow switching capability includes an optical line terminal OLT passive optical network PON medium access control layer MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or

The access network device with OpenFlow switching capability includes a SDN optical line terminal OLT.

The embodiment of the present invention further provides a method for managing an ONU in a software-defined network SDN/network function virtualization NFV open access network system, where the method includes:

The virtual optical line terminal vOLT encapsulates the OMCI original message into a management data frame through the southbound interface mapping and sends it to the access network device with OpenFlow switching capability through the OpenFlow Openflow switching network;

The access network device with the OpenFlow switching capability decapsulates and re-encapsulates the management data frame, restores the OMCI message, and sends it to the ONU through the ODN;

The ONU receives the OMCI message and performs OMCI configuration.

Optionally,

The vOLT encapsulates the OMCI original message map into a management data frame by using the OpenFlow management and configuring the OF-Config protocol or the network configuration Netconf protocol.

Optionally,

The vOLT encapsulates the OMCI original message map into a management data frame by extending the OF-Config protocol or the negotiated data channel model NDM of the Netconf protocol.

Optionally,

The access network device with the OpenFlow switching capability includes an optical line terminal OLT passive optical network PON medium access control layer MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or

The access network device with OpenFlow switching capability includes a SDN optical line terminal OLT.

The embodiment of the present invention further provides a control device for an optical network unit ONU, where the control device is configured with a virtual optical line terminal vOLT, and the vOLT includes an ONU management module, where the ONU management module includes:

The encapsulation unit is configured to: encapsulate the original message used for the ONU management control into a management data frame by using the southbound interface mapping;

The sending unit is configured to: send the management data frame to the access network device with open flow switching capability through the open flow switching network.

The embodiment of the present invention further provides an access network device with an open flow switching capability, where the access network device includes a software defined network SDN proxy, and the SDN proxy includes an optical network unit ONU management control processing module. The ONU management control processing module includes:

a conversion unit, configured to receive a management data frame sent by the control device of the optical network unit ONU, decapsulate the management data frame, and re-encapsulate the original message for the ONU control management;

And a sending unit, configured to send the original message to the ONU through an optical distribution network ODN.

The embodiment of the invention further provides a method for managing an ONU, including:

The ONU management module on the virtual optical line terminal vOLT encapsulates the original message used for the ONU management control into a management data frame through the southbound interface mapping;

The ONU management module sends the management data frame to the access network device with open flow switching capability through the open flow switching network.

The embodiment of the invention further provides a method for managing an ONU, including:

The software-defined network SDN proxy on the access network device with open flow switching capability receives the management data frame sent by the control device of the optical network unit ONU, decapsulates the management data frame, and re-encapsulates it for use in the ONU control management. Original message

The SDN agent sends the original message to the ONU through an optical distribution network ODN.

The above solution can combine the SDN OVS network with the traditional ONU management, on the one hand, adapt to the future SDN requirements, and on the other hand, can take advantage of the traditional ONU management, thereby saving costs and improving efficiency when transforming the network structure.

Other features and advantages of the embodiments of the invention will be set forth in the description in the description in the claims The objectives and other advantages of the embodiments of the present invention can be realized and obtained by the structure of the invention.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic structural diagram of an SDN/NFV open access network according to an embodiment of the present invention;

2 is a schematic diagram of communication of an SDN/NFV open access network according to an embodiment of the present invention;

FIG. 3a is a schematic diagram of modeling of an Openflow Capable Switch according to an embodiment of the present invention; FIG.

FIG. 3b is another schematic diagram of modeling of an Openflow Capable Switch according to an embodiment of the present invention; FIG.

4 is a schematic structural diagram of a system for managing an ONU by an SDN controller according to an embodiment of the present invention;

5 is a schematic diagram of an OVS resource manageable by Openflow Resource in OF-Config 1.2;

6 is a schematic diagram of an OVS resource that can be managed by an NDM class Openflow Resource in an OF-Config 1.2 according to an embodiment of the present invention;

FIG. 7 is a schematic diagram showing an example of layering of the OF-Config/Netconf protocol and data encapsulation of each layer according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of mapping relationship of OMCI encapsulated by OF-Config/Netconf according to an embodiment of the present invention.

9 is a flowchart of managing an ONU by an ONU management module on a vOLT according to an embodiment of the present invention;

10 is a structural diagram of a unit of an ONU management module according to an embodiment of the present invention;

11 is a flowchart of an SDN agent managing an ONU on an access network device according to an embodiment of the present invention;

FIG. 12 is a structural diagram of a unit of an ONU management control processing module on an SDN proxy according to an embodiment of the present invention.

Preferred embodiment of the invention

Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the various manners in the embodiments may be combined with each other without conflict.

The steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions. Also, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

According to the G984.3 standard, the control and management level of the ONU has three parts: OAM (Operation Administration and Maintenance), physical layer OAM (PLOAM), and OMCI. OMCI is one of them, which provides a unified interface for high-level control and management. OMCI is a configuration transmission channel defined in the Gigabit-Capable Passive Optical Network (GPON) standard. It is used in the OLT and ONU (Optical network terminal) (hereinafter the term ONU is used uniformly). Between the establishment of a proprietary Asynchronous Transfer Mode (ATM), a permanent virtual channel (PVC), or a GPON Encapsulation Mode (GEM) port (PORT) to transmit OMCI messages for providing standards. Obtain ONU capabilities and manage and control them.

The current basic network operator is the network builder (InP) and the provider of network services (SP). Because network construction requires a lot of investment, operators want to find a way to quickly recover their investment and achieve profitability. Virtualize multiple virtual networks based on the same physical network, and isolate resources, control, and management, respectively carry different services or subnet the virtual network as a service to different virtual network operators (VNOs). . This idea became possible in the SDN/NFV era. In the embodiment of the present invention, a physical access network is virtualized into multiple logical access networks. In order to adapt to the SDN/NFV requirements, the existing traditional access network will be transformed.

The embodiment of the present invention provides an SDN/NFV open access network architecture, which is an architecture for managing a remote ONU by an SDN controller through a vOLT, and conforms to an SDN/NFV (SDN or NFV) evolution.

The software-defined network SDN/network function virtualized NFV open access network system of the embodiment of the invention includes: a virtual optical line terminal vOLT, an access network device with OpenFlow switching capability, and an ONU; wherein the vOLT is exchanged through Openflow The network is interoperable with the access network device; the access network device communicates with the ONU through an optical distribution network ODN. The ONU in this application includes an ONT, or the ONT is also considered as a type of ONU.

In this embodiment, the vOLT includes an OMCI management module (with OMCI management function) Module), the OMCI management module is configured to encapsulate the OMCI original message into a management data frame by using a southbound interface mapping, and send the OMCI original message to the access network device through the Openflow switching network; the access network with Openflow switching capability The device includes an SDN agent (Agent), the SDNAgent includes an OMCI processing module, and the OMCI processing module is configured to decapsulate the management data frame, and re-encapsulate into an OMCI message, and send the OMCI message through the ODN. To the ONU; the ONU, including the OMCI Agent, is configured to: receive the OMCI message, and perform OMCI configuration. Here, the OMCI message may specifically be an ITU G.98 4.4 OMCI message. The vOLT can be configured on an SDN controller.

In the embodiment of the present invention, the OMCI management module of the vOLT is configured to: through an OpenFlow Management and Configuration Protocol (OF-Config) protocol or a Network Configuration Protocol (Netconf: Network Configuration Protocol) protocol (hereinafter referred to as OF-Config/Netconf) encapsulates the OMCI original message map as a management data frame. Optionally, the OMCI management module of the vOLT is configured to: encapsulate the OMCI original message mapping into a management data frame by extending the negotiation data channel model NDM of the OF-Config/Netconf.

In the embodiment of the present invention, the access network device with OpenFlow switching capability includes an optical line terminal OLT passive optical network PON medium access control layer MAC, the OLT PON MAC is located under the OVS, and is connected to the ONU Interworking; or, the access network device with OpenFlow switching capability includes a SDN optical line terminal OLT. The specific architecture is shown in Figure 3a and Figure 3b below.

As shown in FIG. 1 and FIG. 2, it is an SDN/NFV open access network system and a communication diagram thereof according to an embodiment of the present invention.

As shown in FIG. 1 , it is an infrastructure of an SDN/NFV open access network system according to an embodiment of the present invention, and details an architecture relationship of an SDN/NFV open network according to an embodiment of the present invention. In the embodiment of the present invention, the OLT PON MAC layer (Transport Convergence (GTC) layer) of the OLT and the following physical layer are reserved, deployed at the edge of the network, and interconnected with the ONU.

As shown in FIG. 1 , the network above the PON uplink is deployed as a standard OVS switch network, that is, a typical leaf-spine architecture Openflow switching network, through the access network device with OpenFlow switching capability. achieve. Among them, Leaf-Spine's Openflow switching network includes Spine OVS and Leaf OVS, and Leaf OVS is deployed in Spine OVS. Spine OVS is interconnected with all Leaf OVS. In some literature, the OpenFlow Virtual Switch OVS is part of the access network system. The operator can flexibly define a virtual network (vNET) according to network resources, and then hand it over to a virtual network operator (VNO) for management, thereby implementing multi-tenant partitioning based on one physical network.

As shown in FIG. 1 , for the access part function of the OLT, the embodiment of the present invention abstracts the traditional OLT function to the virtual OLT (vOLT) to provide the VNO with flexible management, configuration, control and other functions of the PON network part. The vOLT can reside on the SDN controller (SDN Controller), or can reside in other general-purpose computing platforms such as the X86 cloud service center, and no longer depends on the location of the traditional OLT, thereby decoupling the OLT function and physical location. . As shown in FIG. 1, in the SDN controller, multiple vOLTs, such as vOLT0, vOLT1, ..., vOLTn, can be deployed. Where n is an integer not less than 1.

As shown in FIG. 1, in the embodiment of the present invention, many control and management functions of the traditional OLT will be componentized and moved up to the SDN controller (SDN Controller). Some or all of the control and management functions of the traditional OLT are provided by the vOLT of the SDN controller. The vOLT of the SDN controller controls the access network device with OpenFlow switching capability through a southbound interface such as OF-Config. An ODN network (ODN Network) connected to an ONU with an OpenFlow Openflow switching capability can remain unchanged.

In the SDN/NFV open access network architecture shown in Figure 1, different ONU sets (ONUs) are controlled by different vOLTs. Among them, ONUs controlled by vOLT1 (vOLT1controlled ONUs), two ONUs controlled by vOLT0 (vOLT0controlled ONUs), ONUs controlled by vOLT2 (vOLT2controlled ONUs), and ONUs controlled by vOLTn (vOLTn controlled ONUs).

As shown in FIG. 2, it is a simplified schematic diagram of a communication logic relationship of an SDN/NFV open access network system according to an embodiment of the present invention, which mainly shows a logical relationship of an OMCI traversing an SDN/NFV open access network, and can also be considered as FIG. The logical abstraction on the illustrated infrastructure omits the OVS intermediate network. As shown in FIG. 2, after the SDN/NFV transformation, the embodiment of the present invention moves the OMCI management module of the ONU on the traditional OLT to the vOLT for the SDN/NFV open access network architecture shown in FIG. 1, that is, Deploy the OMCI management module on the vOLT. The management of the ONU is implemented by the vOLT through the OMCI. The OMCI original message of the vOLT is encapsulated by the southbound interface mapping, and is passed through Openflow. The switching network layer (Openflow Layer) arrives at the OLT PON MAC or the SDN agent (Agent) on the SDN OLT for protocol conversion, and then restores to the traditional ITU-T G.984.4OMCI message format, and continues to use the ODN network for ONU management. That is to say, the restored OMCI message on the OLT PON MAC or SDN OLT reaches the ONU through the PON layer PON layer to implement management of the ONU. As such, the architecture provided by the embodiment of the present invention greatly utilizes the original ODN network, reduces management costs, and improves the speed of the SDN/NFV transformation of the access network.

For the access network, the traditional OLT PON access network needs to provide OpenFlow switching capability in the direction of SDN/NFV evolution. The original access network part needs to be transformed into a future-oriented access network with Openflow switching capability. As shown in FIG. 3a and FIG. 3b, FIG. 3 is a schematic diagram of a possible implementation structure of an access network device with OpenFlow switching capability in the embodiment of the present invention (ie, a schematic implementation diagram of an OpenFlow Capable Switch in an access device). The specific form of the openflow Capable Switch in the SDN/NFV open access network system of the embodiment of the present invention may be two types, specifically: OVS+OLT PON MAC+ONUs (shown in Figure 3a) and SDN OLT+ONUs (Figure 3b)). Among them, Openflow Capable Switch is a general concept. The Openflow Capable Switch is defined in the OF-CONFIG 1.2 standard as a physical or virtual switching device that provides the context of an Openflow logical switch. The Openflow Capable Switch contains Openflow resources that can be instantiated and managed by Openflow Logical Switches.

As shown in FIG. 3a and FIG. 3b, two specific implementation manners of an access network device with OpenFlow switching capability are provided. As shown in FIG. 3a, an access network device with OpenFlow switching capability (ie, an access network device modeled as an OpenFlow Capable Switch) may include an OVS and an OLT PON MAC, where the OVS is located on the OLT PON MAC, OLT PON The MAC is located on the uplink of multiple ONUs (ie, ONUs in Figure 3a), and the OVS is interconnected with the ONUs through the OLT PON MAC. As shown in FIG. 3b, an access network device (that is, an access network device modeled as an OpenFlow Capable Switch) having an OpenFlow switching capability may include: an SDN OLT, and the SDN OLT functions as a plurality of ONUs (ie, ONUs in FIG. 3b). The Union. The specific modeling details are not described here, and the embodiments of the present invention are not limited to these two modes.

As shown in FIG. 4, it is a specific implementation logic diagram of an SDN/NFV open access network system according to an embodiment of the present invention, which shows specific implementation logic in the infrastructure shown in FIG. 1, and can also be considered as FIG. 4 for OMCI control through SDN. The southbound interface manages the logical architecture of the ONU, and OVS is omitted. OVS The configuration protocols mainly include OF-Config1.2, Netconf, and OVS database (OVSDB). The Openflow protocol itself focuses on the definition of flow tables and the flow table-driven forwarding processing. OVS can manage traditional ONUs through the southbound interface of the SDN controller. In the embodiment of the present invention, the OMCI management of the ONU is simulated by the OF-Config 1.2 to implement the OMCI management of the SDN OLT or the OLT PON MAC.

As shown in FIG. 4, the process of the vOLT managing the physical entity OLT includes: the location of the legacy OLT is replaced by the SDN OLT or the OLT PON MAC. In the embodiment of the present invention, the traditional physical OLT is evolved into an SDN OLT or an OLT PON MAC, and the SDN OLT or the OLT PON MAC provides the basis of the access network device with OpenFlow switching capability. However, the inherent alarms and status of the OLT in the SDN OLT or OLT PON MAC still exist and can be directly managed and collected by the vOLT. The Simple Network Management Protocol (SNMP) Management Information Base (MIB) on the OLT on the traditional OLT moves up to the vOLT MIB to provide management of the SDN OLT/OLT PON MAC, and manages the part of the physical resources that the vOLT can control. The SDN OLT/OLT PON MAC no longer has MIB resident locally.

As shown in FIG. 4, the process of the vOLT managing the physical entity ONU includes: the vOLT manages the remote ONU by encapsulating the OMCI original message in the data frame of the southbound interface. The OMCI message is encapsulated by the southbound configuration protocol such as OF-Config/Netconf and passes through the Openflow switching network to reach the access network device with open flow switching capability. This OMCI is encapsulated across the Openflow network to manage traditional ONUs in line with the evolution of future SDN/NFV open access networks.

The embodiment of the present invention further provides a method for managing an ONU in an SDN/NFV open access network system, where the method includes: configuring a vOLT on an SDN controller to encapsulate an OMCI original message into a management data frame by using a southbound interface mapping. And the OpenFlow switching network is sent to the access network device with the OpenFlow switching capability; the access network device with the OpenFlow switching capability decapsulates and re-encapsulates the management data frame, restores the OMCI message, and sends the message through the ODN. To the ONU; the ONU receives the OMCI message and performs OMCI configuration. Here, the OMCI message may specifically be an ITU G.98 4.4 OMCI message.

The vOLT may encapsulate the OMCI original message map as a management data frame by OF-Config/Netconf. In the embodiment of the present invention, the vOLT encapsulates the OMCI original message mapping into a management data frame by extending the negotiation data channel model NDM of the OF-Config/Netconf. Here, the specific architecture of the access network device with Openflow switching capability has been explained above, no longer Said.

As shown in FIG. 4, the process of the vOLT managing the physical OLT and the ONU may basically include:

Step 401: The vOLT provides framing, that is, management data frames encapsulated into the southbound interface (according to the southbound configuration protocol such as OF-Config/Netconf), and is delivered to the SDN OLT or the OLT PON MAC. The vOLT adopts the XML language through the encapsulation of OF-Config/Netconf, and can also extend the OMCI MIB information in the ONU.

Step 402: The SDN OLT or the OLT PON MAC terminates the management data frame by the OMCI processing module in the SDN Agent (SDN Agent), decapsulates, strips the OF-Config encapsulation, and encapsulates the traditional OMCI in the ITU-T G.984.4 format. Message

Step 403: The SDN OLT or the OLT PON MAC sends the OMCI message to the ONU through the traditional PON interface, and performs OMCI configuration, management, and information collection operations through the OMCI Agent, the OMCI MIB, and the ONU data collection module. The ONU local OMCI MIB format is unchanged, and the alarm or status is still reported to the SDN OLT or OLT PON MAC through the OMCI.

The traditional OLT reserves 255 GemPorts (including OMCC channels) for each PON port, and manages the ONUs connected to the OLT through a fixed reserved management channel. GemPort refers to the Gem port, and the Gem is a GPON encapsulation port (GPON Encapsulation). Short for Mode). Corresponding to this feature, the SDN controller and the SDN Agent can realize the management channel isolation of the vOLT to the ONU by assigning the management IP and reserving the TCP port. The IP+TCP port can be allocated by the SDN controller in a dynamic or static configuration mode, and supports multiple management IPs and the allocation of TCP ports under it.

Because TCP connections provide a reliable data connection management channel. After the vOLT manages the OMCI message of the ONU to reach the physical entity OLT, the mapping between the SDN Agent and the Gemport reserved by the traditional OLT management is still performed by the traditional OLT to the ONU optical network unit management and control channel (OMCC, Optical Network Unit). Management and Control Channel) sends OMCI messages to their respective ONUs. The management architecture of the SDN OLT/OLT PON MAC to ONU remains unchanged.

How to encapsulate the OMCI message by OF-Config/Nefconf is described in further detail below with reference to FIG. 5, FIG. 6, FIG. 7, and FIG.

As shown in FIG. 5, it is a schematic diagram of an OVS resource manageable by Openflow Resource in OF-Config1.2. As shown in FIG. 5, in the management of a typical Openflow switch, the controller usually uses OF-Config and OVS DB. Although both Netconf and OpenFlow can provide communication between controller software and devices, the two protocols are completely different in many ways. Netconf is a configuration protocol, and OpenFlow only passes in the process table to specify how packets are routed. OpenFlow switches are configured using OF-Config, using Netconf and its extensions to communicate with new Openflow Switch devices. OF-Config is more focused on modeling YANG models for OVS switching. As shown in the figure, Openflow Resources in the data model of OF-Config is defined to manage the resources related to Openflow features in OVS. For OMCI original messages, the typical Openflow Resources in the data model directly using OF-Config is not suitable.

As shown in FIG. 6, the OF-Config 1.2 of the embodiment of the present invention includes a schematic diagram of an ODM resource manageable by the NDM class Openflow Resource. As shown in Figure 6, OF-Config 1.2 defines the Negotiable Datapath Model (NDM). The main function of NDM is: OVS switches of different manufacturers and different characteristics negotiate NDM capability with the controller, so that the OVS can be configured and driven to perform Openflow forwarding more flexibly and conveniently. At the same time, NDM can also be used to expand to meet the special needs of different devices. In the embodiment of the present invention, the original OMCI message is an extension of the NDM packet, thereby performing OMCI message encapsulation. In OF-Config 1.2, the NDM class can be customized to carry the contents of the OMCI message.

Among them, the OF-Config/Netconf protocol uses Extensible Markup Language (XML) as the encoding method of configuration data and protocol messages, and uses C/S and RPC to obtain, update or delete corresponding partial or all management information in the device. XML can express complex, managed management objects with inherent logical relationships, greatly improving operational efficiency and object standardization. It can provide message like class information block (MIB) or data encapsulation using traditional MIB, which is convenient for ONU. The OMCI MIB interacts with powerful scalability.

FIG. 7 is a schematic diagram showing an example of data layering of the OF-Config/Netconf protocol layer and each layer according to an embodiment of the present invention. The protocol encapsulation of OF-Config/Netconf shows that the OF-Config operation field can be used to map the typical operation of OMCI.

FIG. 8 is a schematic diagram of a mapping relationship when an OMCI is encapsulated by OF-Config/Netconf according to an embodiment of the present invention. According to the mapping relationship shown in Figure 8, various typical operations of OMCI can be Encapsulation is performed by the operation corresponding to OF-Config. The ITU-T G.984.4OMCI original message generated by vOLT can be encapsulated into OF-Config/Netconf for data transmission (ie, from SDN controller to SDN new vOLT) after simple analysis by controller.

In the embodiment of the present invention, the OMCI original message is specifically encapsulated by the XML language used by the OF-Config/Netconf. The following is an example: an OMCI Create message, where the Message Type and Device identifier type fields in the message are identified by the controller. And parse, enter the XML package software processing module. The core of the XML encapsulation software processing module may be a privately extended OMCI (OMCI over Netconf Yang) model carried on Netconf Yang. The extension here is similar to the extension of OF-Config, and the OMCI can be carried by a custom class. Message. After modeling the OMCI over Netconf Yang model in the XML encapsulation software processing module, the original OMCI message is converted and transmitted through the XML data segment. All fields except Message Type and Device identifier type are encapsulated into XML data segments for transmission to the SDN OLT/OLT PON MAC. The SDN agent (Agent) on the SDN OLT/OLT PON MAC decapsulates the data packet and then restores the original OMCI message to the ONU. The entire packaging process has a clear correspondence and is easy to handle. Other types of OMCI packet encapsulation processes are not described here.

For OMCI (OMCI over OVS DB) carried on the OVS DB, a similar protocol extension can also be performed according to OMCI over OF-Config, and its implementation is also within the scope of the embodiments of the present invention. For the EPON system, the management of the ONU is managed by the OAM message, and is encapsulated by the OF-Config after being extended by the embodiment of the present invention. Therefore, the architecture of the EPON system OAM message managing the ONU through the OF-Config is also protected by the embodiment of the present invention. Within the scope.

Through the embodiment of the present invention, the SDN OLT or OLT PON MAC in the modified SDN open access network can be directly interconnected by the OpenFlow Capable Switch and the OVS of the data center, providing a new management for the traditional ONU management. The possibility of structural transformation.

Optionally, the vOLT application on the SDN controller is used as the management source, and the OMCI original message is encapsulated in the OF-Config message, and the SDN agent module in the SDN OLT/OLT PON MAC is decapsulated by the OVS network, and is re-encapsulated. The mapping is restored to the OMCI message in the traditional ITU-T G.984.4 format, achieving a point-to-multipoint management mode between the OLT and the ONU.

The embodiment of the present invention further provides a method for managing an ONU, as shown in FIG. 9, including:

Step 110: The ONU management module on the virtual optical line terminal vOLT encapsulates the original message used for the ONU management control into a management data frame by using the southbound interface mapping.

Step 120: The ONU management module sends the management data frame to the access network device with open flow switching capability through an open flow switching network.

In the embodiment of the present invention, the ONU management module is an optical network unit management control interface OMCI management module; the original message includes an optical network unit management control interface OMCI original message; and the protocol used by the southbound interface includes OpenFlow management and Configure the OF-Config protocol or the network configuration Netconf protocol.

In the embodiment of the present invention, the negotiation data channel model NDM of the OF-Config protocol or the Netconf protocol is extended to encapsulate the OMCI original message.

In the embodiment of the present invention, the method further includes: collecting, managing, and managing hardware inherent alarms and states of the optical line terminal OLT in the access network device by the management information base MIB module on the vOLT.

In the embodiment of the present invention, the method further includes: the ONU management module is configured to isolate the management channel of the vOLT to the ONU by allocating and managing the IP address and reserving the TCP port.

The embodiment of the present invention further provides a control device (such as an SDN controller) of an optical network unit ONU, where the control device is configured with a virtual optical line terminal vOLT, and the vOLT includes an ONU management module, as shown in FIG. The ONU management module includes:

The encapsulating unit 10 is configured to: encapsulate the original message used for the ONU management control into a management data frame by using a southbound interface mapping;

The sending unit 20 is configured to: send the management data frame to the access network device with open flow switching capability through the open flow switching network.

In the embodiment of the present invention, the ONU management module is an optical network unit management control interface (OMCI) management module; the encapsulating unit encapsulates an original message for the ONU configuration into a management data frame by using a southbound interface mapping, where the original The message includes an OMCI original message; the southbound interface enables The protocols used include OpenFlow Management and configuration of the OF-Config protocol or network configuration Netconf protocol.

In the embodiment of the present invention, the negotiation data channel model NDM of the OF-Config protocol or the Netconf protocol is extended to encapsulate the OMCI original message.

In the embodiment of the present invention, the management device further includes: a management information base MIB module, configured to: collect and manage hardware inherent alarms and states of the optical line terminal OLT in the access network device.

In the embodiment of the present invention, the ONU management module further includes: a channel management unit configured to: isolate and manage the vOLT to the ONU management channel by allocating and managing the IP address and reserving the TCP port.

The embodiment of the invention further provides a method for managing an ONU, as shown in FIG.

Step 220: The software-defined network SDN proxy on the access network device with open flow switching capability receives the management data frame sent by the control device of the optical network unit ONU, decapsulates the management data frame, and re-encapsulates it for use in the ONU. Control management messages;

Step 230: The SDN agent sends the message for the ONU control management to the ONU through the optical distribution network ODN.

In the embodiment of the present invention, the access network device includes an optical line terminal passive optical network medium access control layer OLT PON MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or The access network device includes a software defined network optical line terminal SDN OLT.

In the embodiment of the present invention, the message for the ONU control management includes an optical network unit management control interface OMCI message; the management data frame is configured by an extended OpenFlow management and configuration OF-Config protocol or a network configuration Netconf protocol mapping. Encapsulated.

In the embodiment of the present invention, the method further includes: the SDN agent allocates a management IP and reserves a TCP port to implement management channel isolation from the vOLT to the ONU;

The SDN agent sends the message for the ONU control management to the ONU through the ODN, including: mapping the TCP port that receives the management data frame to the mapping of the Gemport of the Gigabit passive optical network encapsulation mode port, The optical network unit management and control channel OMCC sends the message for ONU control management to the ONU.

The embodiment of the present invention further provides an access network device with an open flow switching capability, where the access network device includes a software defined network SDN proxy, and the SDN proxy includes an optical network unit ONU management control processing module. As shown in FIG. 12, the ONU management control processing module includes:

The converting unit 50 is configured to receive a management data frame sent by the control device of the optical network unit ONU, decapsulate the management data frame, and re-encapsulate the message for the ONU control management;

The sending unit 60 is configured to send the message for the ONU control management to the ONU through the optical distribution network ODN.

In this embodiment, the access network device includes an optical line terminal passive optical network medium access control layer OLT PON MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or The access network device comprises a software defined network optical line terminal SDN OLT.

In this embodiment, the converting unit decapsulates the management data frame and re-encapsulates the message for the ONU control management, where the message for the ONU control management includes the optical network unit management control interface OMCI message. The management data frame is obtained by extending the OpenFlow management and configuring the OF-Config protocol or the network configuration Netconf protocol mapping package.

In this embodiment, the SDN proxy further includes: a channel management module, configured to allocate a management IP and reserve a TCP port, to implement management channel isolation from the vOLT to the ONU;

Sending, by the sending unit, the message for the ONU control management to the ONU by using an ODN, including: mapping a TCP port that receives the management data frame to a mapping of a Gigabit passive optical network encapsulation mode port Gemport, The optical network unit management and control channel OMCC sends the message for ONU control management to the ONU.

The embodiment of the invention fully utilizes the original ODN network architecture, and simplifies the management process of configuring, maintaining, and updating the ONU of the SDN controller. Moreover, the embodiment of the present invention is easy to expand and quickly upgrades to connect with the Openflow new switching network, which improves management efficiency and reduces management costs.

Compared with the prior art, the SDN OLT or OLT OLT PON MAC in the modified SDN open access network in the embodiment of the present invention can be modeled as an Openflow Capable Switch, and data. The central OVS is directly interconnected, providing a new management architecture for traditional ONU management.

The method for managing an ONU in the SDN/NFV open access network system provided by the embodiment of the present invention is that the vOLT application on the SDN controller is used as a management source, and the OMCI original message is encapsulated in the OF-Config packet, and is SDN/NFV open. The SDN Agent module in the SDN OLT or OLT PON MAC is decapsulated and re-encapsulated into the traditional ITU-T G.984.4 format OMCI message to implement a point-to-multipoint management mode between the OLT and the ONU. The network architecture and the management mode adopted by the embodiment of the present invention only transform the network above the OLT and the OLT, and the networks under the OLT, that is, the ODN and the ONU, do not need to be modified, fully utilize the original ODN network architecture, and simplify the SDN. The controller configures, maintains, and updates the management process of the ONU. Moreover, the embodiment of the present invention is easy to expand and quickly upgrades to connect with the Openflow new switching network, which improves management efficiency and reduces management costs.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Industrial applicability

An SDN/NFV open access network system and a pipe are provided by the solution of the embodiment of the present invention. According to the ONU method, the SDN OLT or OLT OLT PON MAC in the modified SDN open access network can be modeled as an Openflow Capable Switch, which is directly interconnected with the OVS of the data center, providing a new management for the traditional ONU management. Architecture.

Claims (27)

A software-defined network SDN/network function virtualized NFV open access network system, comprising: a virtual optical line terminal vOLT, an access network device with an open stream switching capability, and an optical network unit ONU; The vOLT communicates with the access network device through an OpenFlow switching network; the access network device communicates with the ONU through an optical distribution network ODN. The system of claim 1 wherein The vOLT includes an optical network unit management control interface OMCI management module, and the OMCI management module is configured to encapsulate the OMCI original message into a management data frame through the southbound interface mapping, and send the OMCI original message to the access network device through the Openflow switching network. ; The access network device with OpenFlow switching capability includes an SDN proxy, the SDN proxy includes an OMCI processing module, and the OMCI processing module is configured to: decapsulate the management data frame and re-encapsulate into an OMCI message, Sending the OMCI message to the ONU through an optical distribution network ODN; The ONU includes an OMCI proxy configured to receive the OMCI message and perform OMCI configuration. The system of claim 2, wherein the OMCI management module of the vOLT is configured to encapsulate the OMCI original message map as a management data frame by an OpenFlow Management and Configuration OF-Config protocol or a Network Configuration Netconf protocol. The system of claim 3, wherein the OMCI management module of the vOLT is configured to encapsulate the OMCI original message map as a management data frame by extending the OF-Config protocol or the negotiated data channel model NDM of the Netconf protocol. A system according to any one of claims 1 to 4, wherein The access network device with the OpenFlow switching capability includes an optical line terminal OLT passive optical network PON medium access control layer MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or The access network device with OpenFlow switching capability includes a SDN optical line terminal OLT. A software-defined network SDN/network function virtualized method for managing an ONU in an NFV open access network system, wherein the method includes: The virtual optical line terminal vOLT encapsulates the OMCI original message into a management data frame through the southbound interface mapping and sends it to the access network device with OpenFlow switching capability through the OpenFlow Openflow switching network; The access network device with the OpenFlow switching capability decapsulates and re-encapsulates the management data frame, restores the OMCI message, and sends it to the ONU through the ODN; The ONU receives the OMCI message and performs OMCI configuration. The method of claim 6, wherein the vOLT encapsulates the OMCI original message map as a management data frame by an OpenFlow Management and Configuration OF-Config protocol or a Network Configuration Netconf protocol. The method of claim 7, wherein the vOLT encapsulates the OMCI original message map as a management data frame by extending an OF-Config protocol or a negotiated data channel model NDM of the Netconf protocol. The method according to any one of claims 6 to 8, wherein The access network device with the OpenFlow switching capability includes an optical line terminal OLT passive optical network PON medium access control layer MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or The access network device with OpenFlow switching capability includes a SDN optical line terminal OLT. A control device of an optical network unit ONU, wherein the control device is configured with a virtual optical line terminal vOLT, and the vOLT includes an ONU management module, and the ONU management module includes: The encapsulation unit is configured to: encapsulate the original message used for the ONU management control into a management data frame by using the southbound interface mapping; The sending unit is configured to: send the management data frame to the access network device with open flow switching capability through the open flow switching network. The control device according to claim 10, wherein: The ONU management module is an optical network unit management control interface OMCI management module; The encapsulating unit encapsulates the original message for the ONU configuration into a management data frame by using a southbound interface mapping, where the original message includes an OMCI original message; the protocol used by the southbound interface includes OpenFlow management and configuration OF- Configure the Netconf protocol for the Config protocol or network. The control device according to claim 11, wherein: The negotiated data channel model NDM of the OF-Config protocol or the Netconf protocol is extended to encapsulate the OMCI original message. A control device according to claim 10 or 11 or 12, wherein: The management device further includes: a management information base MIB module, configured to collect and manage hardware inherent alarms and states of the optical line terminal OLT in the access network device. A control device according to claim 10 or 11 or 12, wherein: The ONU management module further includes: a channel management unit configured to: isolate the management channel of the vOLT to the ONU by allocating and managing the IP address and reserving the TCP port. An access network device with an open flow switching capability, wherein the access network device includes a software defined network SDN proxy, and the SDN proxy includes an optical network unit ONU management control processing module, and the ONU management control processing module include: a conversion unit, configured to receive a management data frame sent by the control device of the optical network unit ONU, decapsulate the management data frame, and re-encapsulate the message for the ONU control management; And a sending unit, configured to send the message for the ONU control management to the ONU through the optical distribution network ODN. The access network device of claim 15 wherein: The access network device includes an optical line terminal passive optical network medium access control layer OLT PON MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or The access network device comprises a software defined network optical line terminal SDN OLT. The access network device according to claim 15 or 16, wherein: The conversion unit decapsulates the management data frame and repackages it for use in an ONU control tube The message for the ONU control management includes an optical network unit management control interface OMCI message; the management data frame is configured by an extended OpenFlow management and configuration OF-Config protocol or network configuration Netconf protocol mapping Encapsulated. The access network device according to claim 15 or 16, wherein: The SDN agent further includes: a channel management module, configured to allocate management IP and reserve a TCP port, to implement management channel isolation from the vOLT to the ONU; Sending, by the sending unit, the message for the ONU control management to the ONU by using an ODN, including: mapping a TCP port that receives the management data frame to a mapping of a Gigabit passive optical network encapsulation mode port Gemport, The optical network unit management and control channel OMCC sends the message for ONU control management to the ONU. A method of managing an ONU, including: The ONU management module on the virtual optical line terminal vOLT encapsulates the original message used for the ONU management control into a management data frame through the southbound interface mapping; The ONU management module sends the management data frame to the access network device with open flow switching capability through the open flow switching network. The method of claim 19 wherein: The ONU management module is an optical network unit management control interface OMCI management module; the original message includes an optical network unit management control interface OMCI original message; the protocol used by the southbound interface includes OpenFlow management and configuration OF-Config protocol or The network is configured with the Netconf protocol. The method of claim 20 wherein: The negotiated data channel model NDM of the OF-Config protocol or the Netconf protocol is extended to encapsulate the OMCI original message. The method of claim 19 or 20 or 21 wherein: The method further includes collecting and managing hardware inherent alarms and states of the optical line terminal OLT in the access network device by the management information base MIB module on the vOLT. The method of claim 19 or 20 or 21 wherein: The method further includes: the ONU management module is configured to isolate the vOLT to the management channel of the ONU by allocating and managing the IP address and reserving the TCP port. A method of managing an ONU, including: The software-defined network SDN proxy on the access network device with open flow switching capability receives the management data frame sent by the control device of the optical network unit ONU, decapsulates the management data frame, and re-encapsulates it for use in the ONU control management. Message The SDN agent sends the message for ONU control management to the ONU through the optical distribution network ODN. The method of claim 24 wherein: The access network device includes an optical line terminal passive optical network medium access control layer OLT PON MAC, and the OLT PON MAC is located in the downlink of the open flow virtual switch OVS and communicates with the ONU; or The access network device comprises a software defined network optical line terminal SDN OLT. A method according to claim 24 or 25, wherein: The message for ONU control management includes an optical network unit management control interface OMCI message; the management data frame is obtained by extending OpenFlow management and configuring OF-Config protocol or network configuration Netconf protocol mapping encapsulation. A method according to claim 24 or 25, wherein: The method further includes: the SDN agent allocates a management IP and reserves a TCP port to implement management channel isolation from the vOLT to the ONU; The SDN agent sends the message for the ONU control management to the ONU through the ODN, including: mapping the TCP port that receives the management data frame to the mapping of the Gemport of the Gigabit passive optical network encapsulation mode port, The optical network unit management and control channel OMCC sends the message for ONU control management to the ONU.

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