WO2012027980A1

WO2012027980A1 - Multicast service control method and optical network unit

Info

Publication number: WO2012027980A1
Application number: PCT/CN2011/071811
Authority: WO
Inventors: 曾涛; 张德智
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-08-30
Filing date: 2011-03-15
Publication date: 2012-03-08
Also published as: CN102387424B; CN102387424A

Abstract

The present invention discloses a multicast service control method and an Optical Network Unit (ONU). The method includes: an Optical Line Terminal (OLT) configures multicast preview control parameters to an ONU (S102); when receiving a multicast request, the ONU implements multicast preview functions according to the multicast preview control parameters (S104). The present invention solves the problems in related technologies that the preview service cannot be controlled and that the types of service applications are single, improves the standard multicast control method, enables the support for the multicast preview service, and enriches the service types that can be implemented.

Description

The present invention relates to the field of communications, and in particular to a multicast service control method and an Optical Network Unit (ONU). BACKGROUND A Gigabit Passive Optical Network (GPON) is a point-to-multipoint network structure, a passive optical fiber transmission method, and a GPON Encapsulation Method (GEM) frame. Encapsulation and broadband access technologies that provide a variety of integrated services. GPON consists of three parts: the Optical Line Terminal (OLT), the ONU and the Optical Distribute Network (ODN). In recent years, with the large-scale application of GPON technology, how to implement controllable multicast service on GPON has become a research topic worthy of study.

The GEM port is a logical channel carried by the GPON service. The Gem port has multiple mapping methods and can be associated with user ports, VLAN IDs, and Ethernet priorities. An ONU can support multiple Gem ports, including unicast Gem port and multicast Gem port. The multicast Gem port can be received by all ONUs of a multicast group under a PON interface. The unicast Gem port identifier is used to transmit the downlink multicast data packet to all ONUs through the multicast Gem port and single copy broadcast (SCB). The multicast service distribution control point is on the ONU device. At present, the control method defined by the existing GPON international standard ITU-T G984.4 is a distributed protocol control method pre-issued by the permission table, that is, the OLT is set by the ONT Management and Control Interface (OMCI). The multicast permission control table of the ONU device (the list of multicast channels that the user can access) is associated with the user port to perform service configuration. The ONU runs the Internet Group Management Protocol (IGMP) Snooping (listening;). When the multicast group requested by the user is in the multicast permission control table, the user is allowed to join. Otherwise, the user is denied to join. Therefore, the purpose of filtering illegal multicast data is achieved. The multicast access control list defined by the G984.4 standard, that is, the Dynamic access control list table defined in the Multicast Operations Profile (MOP)

(Dynamic Access Control List), only basic viewing permission control can be implemented, and the multicast preview function cannot be controlled, and the business application is greatly restricted. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a multicast service control method and an optical network unit to at least solve the above problems. An aspect of the present invention provides a multicast service control method, including: an OLT configuring a multicast preview control parameter to an ONU; and when receiving an multicast request, the ONU implements a multicast preview function according to a multicast preview control parameter.

The OLT configures the multicast preview control parameters to the ONU through the multicast operation template management object.

The mode in which the OLT configures the multicast preview control parameters through the multicast operation template management object includes one of the following: In the first mode, the OLT carries the multicast preview control parameters in the multicast operation template management object and configures the ONU. In the second mode, the OLT group The broadcast preview control parameter is carried in the multicast preview template management object and configured to the ONU, and then the pointer to the multicast preview template management object is carried in the multicast operation template management object and configured to the ONU, and the ONU manages the multicast operation template according to the pointer. The object and its corresponding multicast preview template management object. In the first mode, the OLT carries the multicast preview control parameter in the reserved field of the dynamic access control list in the multicast operation template management object. In the second mode, the OLT carries the pointer to the multicast preview template management object. The reserved field of the dynamic access control list in the multicast operation template management object.

When the ONU receives the multicast request, the multicast preview function is implemented according to the multicast preview control parameter. The ONU receives the multicast service request from the user port. The ONU controls the multicast preview control parameter to determine whether the multicast preview service is allowed. If yes, the packet is forwarded to the OLT, and the multicast data is forwarded to the user port. Otherwise, the packet is discarded. After the multicast data is forwarded to the user port, the method further includes: the ONU determines that the multicast preview service should be stopped according to the multicast preview control parameter; the ONU sends a packet for stopping the multicast preview service to the OLT, and stops the user port. Forward multicast data. The multicast preview control parameters include at least one of the following: the maximum duration of each preview, the minimum time interval between two adjacent previews, the maximum number of previews, and the reset time of the preview statistics. Another aspect of the present invention provides an optical network unit, including: a configuration module configured to accept a configuration of a multicast preview control parameter of an associated OLT; and a control module configured to perform a multicast preview service according to a multicast preview control parameter Take control. The configuration module includes: a first receiving module, configured to receive a multicast preview template management object configured by the OLT, where the multicast preview template management object carries a multicast preview control parameter; and the second receiving module is configured to receive the multicast configured by the OLT The operation template management object, wherein the multicast operation template management object carries a pointer to the multicast preview template management object; and the association module is configured to associate the multicast operation template management object and its corresponding multicast preview template management object according to the pointer. The configuration module includes: a third receiving module, configured to receive a multicast operation template management object configured by the OLT, where the multicast operation template management object carries a multicast preview control parameter. Through the invention, the OLT is used to centrally manage and configure the multicast preview control parameters of the ONU, and then the ONU performs a preview control mechanism according to the multicast preview control parameters, thereby solving the problem that the preview service cannot be controlled in the related art, and the service application is A single type of problem, the standard multicast control method is improved, can support the multicast preview service, and enrich the types of services that can be realized. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a flowchart of a method for controlling a multicast service according to an embodiment of the present invention; FIG. 2 is a structural block diagram of an optical network unit according to an embodiment of the present invention; and FIG. 3 is an optical network according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a block diagram 2 showing a preferred structure of an optical network unit according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. 1 is a flowchart of a multicast service control method according to an embodiment of the present invention. As shown in FIG. 1, the method includes: Step S102: An OLT configures a multicast preview control parameter to an ONU; Step S104, the ONU receives When a multicast request is made, the multicast preview function is implemented according to the multicast preview control parameter. The method uses the OLT to centrally manage and configure the multicast preview control parameters of the ONU, and then the ONU performs a preview control mechanism according to the multicast preview control parameters, and improves the standard multicast control method to support the multicast preview. Business, enriching the types of business that can be realized. The parameter configuration mode can be arbitrarily selected. For example, the new definition message format is used to carry the multicast preview parameter for configuration, or the idle field in the existing message is used to carry, in order to minimize the operation on the existing multicast service. The process and processing mode change, the OLT can configure the multicast preview control parameters to the ONU through the existing multicast operation template management object. The specific configuration mode can be set according to the actual situation. For example, the manner in which the OLT configures the multicast preview control parameters through the multicast operation template management object may include, but is not limited to: mode 1, the OLT carries the multicast preview control parameters in the multicast. The operation template management object is configured to the ONU. In this mode, the ONU can directly control the preview service according to the content in the multicast operation template management object. The specific control mode can be similar to the existing multicast operation service, and the change is small. In the first mode, the OLT can carry the multicast preview control parameter in the reserved field of the dynamic access control list in the multicast operation template management object. In this way, the reserved field defined by the G984.4 standard is used to maintain Compatibility with standards; and, for different channels, different dynamic access control lists, each of which can carry different multicast preview control parameters, thereby flexibly performing multicast preview control on different channels. . In the second mode, the OLT can carry the multicast preview control parameter in the multicast preview template management object and configure it to the ONU, and then carry the pointer to the multicast preview template management object in the multicast operation template management object and configure it to the ONU. The pointer is associated with the multicast operation template management object and its pair The multicast preview template should be managed. In this way, multiple channels can be used to control the same multicast preview control parameters, that is, for different channels, the same pointer can be linked to the same multicast preview template management object, which facilitates the management object. Share, reduce configuration workload. In mode 2, the OLT may carry a pointer to the multicast preview template management object in a reserved field of the dynamic access control list in the multicast operation template management object. In this way, the reserved fields defined by the G984.4 standard are utilized, maintaining compatibility with the standard. Preferably, when the ONU receives the multicast request, the process of implementing the multicast preview function according to the multicast preview control parameter may include the following steps: The ONU receives the multicast service request at the user port (that is, is used to request multicast) The ONU determines whether the multicast preview service is allowed according to the multicast preview control parameter. If yes, the ONU forwards the packet to the OLT and forwards the multicast data to the user port. Otherwise, the packet is discarded. In the method, after receiving the request message, determining whether to allow the preview service according to the multicast preview control parameter, the distributed protocol management on the ONU is realized, and the ONU performs specific control, thereby reducing the operation load of the OLT. . After the multicast preview service is started, in order to implement full control of the preview service, the multicast preview service may be controlled according to the multicast preview control parameter. Preferably, after the multicast data is forwarded to the user port, the ONU is multicast. The preview control parameter determines that the multicast preview service should be stopped. The ONU sends a packet to stop the multicast preview service to the OLT, and stops forwarding the multicast data to the user port. The preview service is stopped, and the ONU performs specific control. The operational load on the OLT is further reduced. Preferably, the multicast preview control parameter may include at least one of the following: a maximum duration of each preview, a minimum time interval between two adjacent previews, a maximum preview number, and a reset time of the preview statistics. Through the setting of the above parameters, the multicast preview control can be conveniently performed. It should be noted that, in practical applications, the control of the multicast preview policy may vary according to actual conditions, and accordingly, the types of multicast preview control parameters are also Changes may occur, not limited to the types of parameters described above. 2 is a structural block diagram of an optical network unit according to an embodiment of the present invention. As shown in FIG. 2, the optical network unit includes: a configuration module 22 configured to accept configuration of a multicast preview control parameter of an OLT to which the OLT belongs; And coupled to the configuration module 22, configured to control the multicast preview service according to the multicast preview control parameter. FIG. 3 is a block diagram of a preferred structure of an optical network unit according to an embodiment of the present invention. As shown in FIG. 3, preferably, the configuration module 22 includes: The first receiving module 32 is configured to receive the multicast preview template management object configured by the OLT, where the multicast preview template management object carries the multicast preview control parameter, and the second receiving module 34 is configured to receive the multicast operation template configured by the OLT. a management object, where the multicast operation template management object carries a pointer to the multicast preview template management object; the association module 36 is coupled to the first receiving module 32, the second receiving module 34, and the control module 24, and is configured to associate with the pointer according to the pointer. The operation template management object and its corresponding multicast preview template management object are broadcasted. 4 is a block diagram of a preferred structure of an optical network unit according to an embodiment of the present invention. As shown in FIG. 4, the configuration module 22 includes: a third receiving module 42 coupled to the control module 24 and configured to receive the OLT. The multicast operation template management object is configured, where the multicast operation template management object carries the multicast preview control parameter. The embodiment 1-2 described below combines the technical solutions of the above-described plurality of preferred embodiments. Embodiment 1 In this embodiment, the existing GPON OMCI standard management interface definition is used, and the multicast authority control table is still issued by the OLT, and the ONU performs the multicast protocol control mode autonomously, that is, centralized rights management, distributed Protocol control is used to manage and control the preview business. In order to support the complete ONU multicast preview function, the OLT needs to configure the channel preview permission and related preview parameters to the ONU. You can specify access rights for each multicast channel in the multicast rights control table (for example, viewing or preview). And configuring the preview parameters related to the preview permission, for example, the number of previews, the maximum duration of the preview, the minimum interval of the preview, etc., and the ONU performs preview control according to the issued multicast permission control table. The specific preview parameters are configured as follows:

(1) Multicast preview profile management object (Management Entity, ME for short), which is used to configure the multicast preview template of the ONU, which can be created and deleted by the OLT. The attributes in this ME are defined as follows:

Managed entity id (2 bytes): An instance of a multicast preview template that is uniquely defined and can be associated with other ME references. The pointers mentioned in the second method above can be used. The indication is to use the management entity identifier. Of course, it is not limited to the management entity identifier. Other parameters that can identify the ME can be used as pointers.

Preview count (2 bytes): Defines the maximum number of times the user is allowed to preview. Preview duration (2 bytes): Defines the duration, in seconds, that the user is allowed to preview once.

Preview blackout (2 bytes): Defines the minimum interval between two previews by the user, in seconds.

(2) Extended operation profile ME, an entry for the dynamic access control list table in the ME of the Multicast operations profile defined in the G.984.4 standard. The attribute is extended, using the Reserved field, associated to the multicast preview template. The fields of the dynamic access control list are defined in the G984.4 standard as follows: Table Index (2 bytes) GEM Port Identifier (2 bytes)

VLAN number (2 bytes) Source IP address (4 bytes) Start destination IP address (4 bytes) Abort destination IP address (4 bytes) Group bandwidth (4 bytes) Reserved (2 bytes). In this embodiment, in order to associate the multicast preview template ME with the current extended multicast operation template ME, the reserved field is improved as follows:

0- indicates viewing rights Oxffff- indicates the default preview parameter template Other values - This value indicates the purpose of the Multicast preview profile. In this configuration mode, the implementation of the multicast preview control includes the following steps: In the first step, the OLT creates a multicast preview template, and configures the preview template to the ONU through the Multicast preview profile ME. The second step is to create a group by the OLT. The operation template is broadcasted, and the association between the channel and the preview template is established. The multicast permission control table including the preview parameter is configured on the ONU through the Multicast operations profile ME. The third step is when the ONU device receives the user multicast IGMP request. The packet is searched for the local multicast permission table. If the multicast group is requested to be previewed, the current user preview number is checked. If the maximum number of previews defined in the preview template is exceeded, the IGMP request packet is discarded. Otherwise, the user port multicast forwarding entry is set, the multicast data is forwarded to the user port, and the IGMP request packet is forwarded to the OLT, and the current preview count is added. The ONU starts the preview timer of the multicast member, previewing The time is set according to the preview duration defined in the preview template. In the fourth step, the OLT receives the IGMP request packet forwarded by the ONU, and establishes a multicast forwarding entry on the OLT. In the fifth step, when the ONU multicast member preview timer expires, the user port multicast forwarding entry is deleted, the multicast data is not forwarded to the user port, and the IGMP leave message is sent to the OLT. At the same time, the ONU starts the blackout timer, and the timer time is set according to the preview blackout defined in the preview template. In the sixth step, if the user receives the IGMP request for the preview channel within the blackout timing period, the IGMP request message is discarded. For ease of understanding, the specific implementation process of the above method is described below by specific examples. Example 1 Set the multicast VLAN to 100 and the multicast IP address to 224.1.1.1. The permission is preview. The specific configuration and control process includes the following steps: Step 1: Create a multicast preview template mppO on the OLT, with an id of 1, set the preview count to 10, preview a maximum duration of 300 seconds, and preview a minimum interval of 60. second. And multicast pre- The view template mppO is configured on the ONU through the Multicast preview profile OMCI interface defined in this embodiment. In the second step, create a multicast operation template mopO on the OLT, add 224.1.1.1 to the dynamic access control list, and set the Reserve field to 1 (this process implements association between the channel and the preview template) „ The multicast operation template mopO is configured on the ONU through the Multicast operation profile OMCI interface defined by the G984.4 standard. The third step is to apply the multicast operation template mopO on the ONU user port 1 on the OLT and define it by the G984.4 standard. Multicast subscriber config info (Multicast subscriber configuration information) The OMCI interface is configured on the ONU. The fourth step is to find the dynamics of the multicast operation template when the ONU receives the IGMP join message with the group address 224.1.1.1 on port 1. Access control list, the permissions of the corresponding entry are preview, and the following hardware forwarding entry settings are made:

VID=100, MAC=01:00:5e:01:01:01, port=l At the same time, the preview timer is started, the duration is 300 seconds, and the IGMP message requested by the user is sent to the OLT. In the fifth step, when the preview timer expires, the hardware forwarding entry is deleted, and the IGMP Leave message is sent to the OLT. Embodiment 2 In this embodiment, the existing GPON OMCI standard management interface definition is used, and the multicast permission control table is still sent by the OLT, and the ONU performs the multicast protocol control mode autonomously, that is, centralized rights management, distributed Protocol control is used to manage and control the preview business. The difference from the first embodiment is that the OLT directly carries the multicast preview control parameter in the MOP (Multicast Operation Profile) management object, and the ONU controls the multicast preview function when receiving the multicast preview application according to the above setting parameters. . In order to support the complete ONU multicast preview function, the OLT needs to configure the channel preview permission and related preview parameters on the ONU, and can specify access rights (view or preview) for each multicast channel in the multicast rights control table, and Configure preview parameters related to preview permissions, including preview times, preview maximum duration, and preview minimum interval. The ONU performs preview control according to the issued multicast permission control table. The specific preview parameters are configured as follows: In the ME of the G.984.4 standard or the Multicast operations profile defined by the G.988 standard, the entry attribute of the Dynamic access control list table is extended, using Reserved. ) field, add the actual control parameters of the multicast preview, the ME is created and deleted by the OLT. The fields of the dynamic access control list are defined in the G984.4 standard as follows: Table index (2 bytes)

GEM port identifier (2 bytes)

VLAN number (2 bytes) Source IP address (4 bytes) Start destination IP address (4 bytes) Abort destination IP address (4 bytes) Group bandwidth (4 bytes) Reserved (2 bytes). In this embodiment, in order to carry the multicast preview control parameter in the reserved field of the current extended multicast operation template ME, the reserved field is improved as follows:

Bits 2-0, preview length: the maximum length of each preview, where

0: No preview (ONU is used to judge whether this channel can provide multicast preview function, 0 means no preview function) 1: Preview 10 seconds

2: Preview 30 seconds

3: Preview 1 minute

4: Preview 2 minutes

-6: ITU reservations 7: Reserved for future specific organizations

Bits 5-3, Preview Repeat Interval: The minimum time between two preview requests by the user (UNI), its towel,

0: No time interval requirement 1: 30 second interval

2: 1 minute 3: 3 minutes 4: 5 minutes 5: 10 minutes 6~7: Reserved

Bits 8-6, Preview Repeats: User (UNI) The maximum number of preview requests, where 0: no limit

1..7: The numerical value represents the specific number of repetitions

Bits 13-9, Preview reset time: User preview statistics are reset at a certain time, where 0: Reserved

1..24: represents the hour of reset, 2 represents 2 o'clock in the morning;

25-30: ITU reservations

31: Reserved for future specific organizations

Bits 15-14. Reserved. It should be noted that the above is only an exemplary reserved field format, and those skilled in the art should understand that the format may vary depending on the type of the parameter and the value range of the parameter, and is not limited thereto. In this configuration mode, the implementation method of the multicast preview control includes the following steps: In the first step, the OLT sets a multicast preview template, and uses the extended field of the Multicast Operation profile ME to configure the preview template parameters in the channel parameter table of the ONU. In the second step, the ONU device receives the user multicast IGMP request packet, and searches. Local multicast permission table. If the request multicast group is previewable, the multicast preview function is implemented according to the parameter settings in the first step and the internal preview statistics: First, check the current user preview number, if it exceeds the definition in the preview template. The maximum number of previews is discarded, and the IGMP request is discarded. Otherwise, the user port multicast forwarding entry is set, the multicast data is forwarded to the user port, and the IGMP request packet is forwarded to the OLT, and the current preview count is added. The ONU starts the preview timer of the multicast member, previewing The time is set according to the preview length value defined in the preview template. In the third step, the OLT receives the IGMP request packet forwarded by the ONU, and establishes a multicast forwarding entry on the OLT. In the fourth step, when the ONU multicast member preview timer expires, the user port multicast forwarding entry is deleted, the multicast data is not forwarded to the user port, and the IGMP leave message is sent to the OLT. At the same time, the ONU starts the preview repeat interval timer, and the timer time is set according to the preview repetition interval defined in the preview template. In the fifth step, if the user receives the IGMP request for the preview channel within the preview repeat interval timing period, the IGMP request message is discarded. For ease of understanding, the specific implementation process of the above method is described below by specific examples. Example 2 Set the VLAN of a multicast channel to 100 and the IP address to 224.1.1.1. The permission is preview. The specific configuration and control process includes the following steps: In the first step, the OLT sets the preview parameter in the MOP management object of the multicast channel in the ONU by using the MOP extension field in the second embodiment of the patent, and the preview frequency is 10, The preview has a maximum duration of 300 seconds and a preview minimum interval of 60 seconds. In the second step, when the ONU receives the IGMP join message with the group address 224.1.1.1 on port 1, the ONU searches for the dynamic access control list of the multicast operation template, and the rights of the corresponding entry are previewed. The following hardware forwarding entry settings are performed. :

VID=100, MAC=01:00:5e:01:01:01, port=l At the same time, the preview timer is started, and the duration is 300 seconds. The IGMP message requested by the user is sent to the OLT. In the third step, when the preview timer expires, the hardware forwarding entry is deleted, and the IGMP Leave message is sent to the OLT. In summary, the solution provided by the embodiment of the present invention improves the existing multicast control mode, and expands the ONU multicast permission control table to support preview control and preview parameter configuration, thereby providing a complete controllable The multicast solution solves the problem that the multicast control interface of the G984.4 standard cannot implement the GPON ONU multicast preview function. Moreover, the scheme maintains the compatibility with the standard by utilizing the reserved fields defined by the G984.4 standard. . It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A multicast service control method, including:

The optical line terminal OLT configures the multicast preview control parameter to the optical network unit ONU. When the ONU receives the multicast request, the multicast preview control parameter implements a multicast preview function.

The method according to claim 1, wherein the OLT configures the multicast preview control parameter to the ONU through a multicast operation template management object.

The method according to claim 2, wherein the manner in which the OLT configures the multicast preview control parameter by using a multicast operation template management object includes one of the following:

In a first mode, the OLT carries the multicast preview control parameter in the multicast operation template management object and is configured to the ONU;

In the second mode, the OLT carries the multicast preview control parameter in the multicast preview template management object, and is configured to the ONU, and then carries a pointer to the multicast preview template management object in the multicast operation template. The management object is configured to the ONU, and the ONU associates the multicast operation template management object and its corresponding multicast preview template management object according to the pointer.

The method according to claim 3, wherein, in the first manner, the OLT carries the multicast preview control parameter in a reservation of a dynamic access control list in the multicast operation template management object. In the second mode, the OLT carries the pointer to the multicast preview template management object in a reserved field of the dynamic access control list in the multicast operation template management object.

The method according to claim 1, wherein when the ONU receives the multicast request, implementing the multicast preview function according to the multicast preview control parameter includes:

Receiving, by the ONU, a multicast service request at the user port;

Determining, by the ONU, whether the multicast preview service is allowed to be performed according to the multicast preview control parameter, and if yes, forwarding the packet to the OLT, and forwarding the multicast data to the user port, otherwise, discarding The 4 艮 text.

The method according to claim 5, wherein, after the multicast data is forwarded to the user port, the method further includes:

Determining, by the ONU, that the multicast preview service should be stopped according to the multicast preview control parameter;

The ONU sends a message for stopping the multicast preview service to the OLT, and stops forwarding multicast data to the user port.

The method according to any one of claims 1 to 6, wherein the multicast preview control parameter comprises at least one of: a maximum duration of each preview, a minimum time between two adjacent previews Interval, maximum preview count, reset time for preview statistics.

8. An optical network unit, comprising:

The configuration module is configured to accept the configuration of the multicast preview control parameter of the OLT; the control module is configured to control the multicast preview service according to the multicast preview control parameter.

The optical network unit according to claim 8, wherein the configuration module comprises:

The first receiving module is configured to receive the multicast preview template management object configured by the OLT, where the multicast preview template management object carries the multicast preview control parameter, and the second receiving module is configured to receive the OLT a multicast operation template management object, where the multicast operation template management object carries a pointer to the multicast preview template management object;

The association module is configured to associate the multicast operation template management object and the corresponding multicast preview template management object according to the pointer.

The third receiving module is configured to receive the multicast operation template management object configured by the OLT, where the multicast operation template management object carries the multicast preview control parameter.