WO2011006339A1 - 一种组播处理方法和装置 - Google Patents

一种组播处理方法和装置 Download PDF

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Publication number
WO2011006339A1
WO2011006339A1 PCT/CN2009/076031 CN2009076031W WO2011006339A1 WO 2011006339 A1 WO2011006339 A1 WO 2011006339A1 CN 2009076031 W CN2009076031 W CN 2009076031W WO 2011006339 A1 WO2011006339 A1 WO 2011006339A1
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Prior art keywords
multicast
onu
olt
type
data
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PCT/CN2009/076031
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English (en)
French (fr)
Inventor
何苑凌
李明生
袁立权
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to JP2012519868A priority Critical patent/JP5449548B2/ja
Priority to EP09847264A priority patent/EP2320598B1/en
Priority to BRPI0924352-6A priority patent/BRPI0924352B1/pt
Priority to US13/121,818 priority patent/US20110176808A1/en
Publication of WO2011006339A1 publication Critical patent/WO2011006339A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1836—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with heterogeneous network architecture
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40013—Details regarding a bus controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0071—Provisions for the electrical-optical layer interface

Definitions

  • the present invention relates to the field of passive optical network (PON) technology, and in particular, to a multicast processing method and apparatus.
  • PON passive optical network
  • the PON (Passive Optical Network) system usually consists of an Optical Line Terminal (OLT) on the central office and an Optical Network Unit (ONU) on the user side. Network Termination ) and Optical Distribution Network (ODN).
  • ODN Optical Distribution Network
  • the ODN consists of passive optical components such as single-mode fibers, splitters, and optical connectors that provide optical transmission media for the physical connection between the OLT and the ONU.
  • the ODN is usually a point-to-multipoint structure, that is, one OLT connects multiple ONUs through an ODN.
  • EPON Ethernet Passive Optical Network (IEEE, Institute of Electrical and Electronics Engineers) 802.3-2005 Section 5 and IEEE802.3av standard for next-generation broadband passive optical integration Access technology.
  • the IEEE standard only defines the physical layer and link layer standards of 1G-EPON and 10G-EPON, and is not involved for other service functions.
  • the IEEE802.3-2005 Section 5 standard defines the 1G-EPON broadcast logical channel identifier as 0x7fff; the IEEE802.3av standard defines the 10G-EPON broadcast logical channel identifier as 0x7ffe.
  • the EPON OLT uses the broadcast logical channel to send the multicast traffic to all ports under one PON port. Then, the ONU determines the direction according to the locally saved multicast and the corresponding table of the local user interface. Which port forwards the multicast service. The above is mainly for the case where only one ONU of the same type is connected to one port under the OLT.
  • the main object of the present invention is to provide a multicast processing method and apparatus for implementing multicast processing when different types of ONUs coexist.
  • the present invention provides a multicast processing method, the method comprising:
  • An optical line terminal that connects different types of optical network units (ONUs) on the same port, when performing downlink multicast data replication, copies multicast data to different broadcasts or according to the type of ONU to which the user joining the multicast group belongs.
  • Multicast logical channel Multicast logical channel.
  • the method further includes: if a user of the same ONU type joins the multicast group on the OLT port corresponding to the multicast group, the multicast data is passed through the broadcast or multicast logic corresponding to the same ONU type. The channel is sent to the ONU under the OLT port.
  • the method further includes: if a user of a different ONU type joins the multicast group under the OLT port corresponding to the multicast group, each of the broadcast or multicast logical channels corresponding to each ONU type sends a multicast. The data is sent to the ONU under the OLT port.
  • the ONU type is divided according to a rate.
  • the method further includes: determining, by the OLT, the user joining the multicast group and the type of the ONU to which the multicast group belongs according to the established information items.
  • the information entry includes: the correspondence between the ONU logical link identifier and the ONU type, the correspondence between the ONU logical link identifier and the OLT port, the correspondence between the multicast group and the ONU logical link identifier, the multicast group and the OLT port. Correspondence.
  • the present invention also provides a multicast processing apparatus, which is applied to an OLT that connects different types of ONUs under the same port, and the apparatus includes:
  • a data receiving module configured to receive multicast data
  • the data replication module is configured to: when the multicast data is copied, copy the multicast data to different broadcast or multicast logical channels according to the ONU type to which the user joining the multicast group belongs.
  • the data replication module is further configured to: when a user of the same ONU type joins the multicast group in the OLT port corresponding to the multicast group, the multicast data is broadcasted by the same ONU type. Or the multicast logical channel is sent to the ONU under the OLT port.
  • the data replication module is further configured to: when a user of a different ONU type joins the multicast group under the OLT port corresponding to the multicast group, send the data through the broadcast or multicast logical channel corresponding to each ONU type. A multicast data is sent to the ONU under the OLT port.
  • the ONU type is divided according to a rate.
  • the device further includes an entry establishing module, configured to establish the information entry; the data replication module is further configured to determine, according to the established information entry, the user joining the multicast group and the ONU type to which the multicast group belongs.
  • the information entry includes: the correspondence between the ONU logical link identifier and the ONU type, the correspondence between the ONU logical link identifier and the OLT port, the correspondence between the multicast group and the ONU logical link identifier, the multicast group and the OLT port. Correspondence.
  • the multicast processing method and device when the OLTs of different types of ONUs are connected to perform the downlink multicast data replication on the same port, copy the multicast data according to the ONU type to which the user joining the multicast group belongs.
  • the present invention implements efficient processing of multicast when different types of ONUs coexist, and enables the ONU to perform a layer 2 group. Before the broadcast forwarding process, it can distinguish whether the multicast data belongs to this type of ONU, avoiding unnecessary interference of the excessive data to the ONU. At the same time, the bandwidth between the OLT and the ONU can be effectively utilized to avoid meaningless data stream bandwidth. Occupy. DRAWINGS
  • FIG. 1 is a schematic diagram of networking in the prior art when 1G-EPON and 10G-EPON coexist
  • FIG. 2 is a flowchart of a multicast processing method according to the present invention
  • FIG. 3 is a flowchart of a multicast processing method according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic structural diagram of a composition of a multicast processing apparatus according to the present invention.
  • Step 201 An OLT that connects different types of ONUs on the same port determines to join the multicast group when performing downlink multicast data replication. The type of ONU to which the user belongs.
  • the ONU type can be divided according to the rate, for example: In EPON, the ONU type is divided into 1G-EPON ONU and 10G-EPON ONU according to the rate.
  • the present invention is not limited to the division according to the rate, and the division basis of the ONU type can be extended according to actual needs.
  • Step 202 The OLT copies the multicast data to different broadcast or multicast logical channels according to the ONU type to which the user joining the multicast group belongs.
  • the multicast data is sent to the OLT port through the broadcast or multicast logical channel corresponding to the same ONU type.
  • ONU If a user of a different ONU type joins a multicast group on an OLT port corresponding to the multicast group, each multicast data is sent to the OLT port through the broadcast or multicast logical channel corresponding to each ONU type. Under the ONU.
  • the OLT when the OLT receives the multicast data, the OLT can determine the user to join the multicast group and the type of the ONU to which the multicast group belongs, and the multicast data delivered by the multicast data.
  • the OLT port determines whether there are different ONU type users under each OLT port corresponding to the multicast data.
  • the information entry may include: a correspondence between the ONU logical link identifier and the ONU type, a correspondence between the ONU logical link identifier and the OLT port, a correspondence between the multicast group and the ONU logical link identifier, and a multicast group. Correspondence with the OLT port, and so on.
  • the mapping between the multicast group and the ONU logical link identifier, and the mapping between the multicast group and the OLT port can be configured through the Internet Group Management Protocol (IGMP) or through the NMS.
  • IGMP Internet Group Management Protocol
  • the OLT determines the corresponding multicast group according to the multicast address and related information carried in the multicast data, and searches for the correspondence between the multicast group and the OLT port according to the multicast group, and obtains the OLT port corresponding to the multicast group. Then, the OLT According to the mapping between the ONU logical link identifier and the ONU type, the correspondence between the ONU logical link identifier and the OLT port, and the correspondence between the multicast group and the ONU logical link identifier, determine the users joining the multicast group and their associated ONUs. Indicates the type and the ONU logical link ID of the multicast group. The user of the different ONUs is added to the multicast group.
  • the OLT When the user of the same ONU type joins the multicast group, the OLT sends the multicast data to the OLT port through the broadcast or multicast logical channel corresponding to the ONU type. ONU.
  • the OLT sends a multicast data to the OLT through the broadcast or multicast logical channel corresponding to each ONU type. ONU under the port.
  • the multicast data passes the 1G-EPON ONU type.
  • the corresponding broadcast logical channel is sent to the ONU under the OLT port, that is, it is sent to the OLT port through the broadcast logical channel identified as 0x7fff. If the OLT determines that only a 10G-EPON ONU user is added to the multicast group, the multicast data is sent to the ONU under the OLT port through the broadcast logical channel corresponding to the 10G-EPON ONU type.
  • the broadcast logical channel identified as 0x7ffe is sent to the ONU under the OLT port; if the OLT determines that a user of the 1G-EPON ONU type and the 10G-EPON ONU type joins the multicast group under a certain port, the group is joined.
  • the broadcast data is sent through the broadcast logical channel corresponding to the 1G-EPON ONU type (the broadcast logical channel identified as 0x7fff) and the broadcast logical channel (the broadcast logical channel identified as 0x7ffe) corresponding to the 10G-EPON ONU type. Multicast data. Through such two transmissions, it is ensured that both the 1G-EPON ONU and the 10G-EPON ONU under the OLT port can receive the multicast data.
  • the multicast processing method in EPON is taken as an example to further elaborate the above multicast processing method.
  • the multicast processing method of the present invention is not limited to the application of EPON, and is applicable to other types of PONs.
  • an implementation method of an IGMP multicast management protocol is adopted.
  • An information entry must be created on the OLT, including two levels of multicast entries and other corresponding relationships.
  • the first-level multicast entry is used to determine the OLT port, and the second-level multicast entry is used to determine the broadcast logical channel.
  • the establishment of multicast entries and other correspondences is as follows:
  • the OLT when receiving an IGMP report (Report) message from the ONU, the OLT establishes or updates the correspondence between the multicast group and the ONU logical link identifier (recorded as correspondence 2), and multicast.
  • the member in the corresponding relationship 4 may be the broadcast logical channel identifier (0x7fff) corresponding to the 1G-EPON and/or the broadcast logical channel identifier (0x7ffe) corresponding to the 10G-EPON, as shown in Table 1 below. :
  • the correspondence 4 constitutes the second-level multicast entry.
  • Step 301 The OLT receives the multicast data through its uplink port.
  • Steps 302 to 303 the OLT searches for a multicast group corresponding to the multicast data according to the multicast address and related information carried in the multicast data. If the corresponding multicast group is found, step 305 is performed; otherwise, the step is performed. 304.
  • the related information includes the VLAN or multicast source address and so on.
  • a VLAN is taken as an example.
  • the OLT can search for a multicast group corresponding to the multicast data only according to the multicast address, and can also search for the multicast data according to the multicast address and the VLAN. Multicast group.
  • Step 304 When the OLT does not find the multicast group corresponding to the multicast data, distribute the multicast data to all ports of the VLAN, and complete the process after the operation is completed.
  • Steps 305-306 when the OLT finds the multicast group corresponding to the multicast data, finds an OLT port corresponding to the multicast group according to the established multicast entry, and copies the multicast data ( Or send it to the OLT port.
  • the OLT searches for the corresponding relationship 3 according to the found multicast group, and obtains an OLT port corresponding to the multicast group.
  • Steps 307 ⁇ 308, in the OLT port that needs to send multicast data look up and compare with the multicast data. If the corresponding multicast group exists, go to step 309; otherwise, end the entire process.
  • Step 309 The OLT port searches for the multicast entry established by the multicast group according to the multicast group, and obtains the broadcast logical channel corresponding to each multicast member, and copies the multicast data to the broadcast logical channel and sends the multicast data to the ONU under the OLT port. .
  • an implementation method of an IGMP multicast management protocol is adopted.
  • the establishment of the first-level multicast entry and other corresponding relationships are as follows:
  • the correspondence between the ONU logical link identifier and the ONU type is established in the OLT (referred to as the correspondence 1), which is used to identify which ONU logical link identifiers correspond to 1G-EPON, and which correspond to 10G-EPON;
  • the correspondence between the multicast group and the ONU logical link identifier is established or updated (recorded as correspondence 2), and the multicast group and the OLT port.
  • the corresponding relationship (denoted as the corresponding relationship 3); the corresponding relationship 2 and the corresponding relationship 3 constitute the first-level multicast entry referred to in this embodiment.
  • the multicast processing method implemented on the basis of the foregoing information entry, as shown in FIG. 4, mainly includes the following steps:
  • Step 401 The OLT receives the multicast data through its uplink port.
  • Steps 402 to 403 the OLT searches for the multicast group corresponding to the multicast data according to the multicast address and the VLAN carried in the multicast data. If the corresponding multicast group is found, step 405 is performed; otherwise, step 404 is performed. .
  • Step 404 When the OLT does not find a multicast group corresponding to the multicast data, Multicast data is distributed to all ports in the VLAN. After the operation is completed, the entire process is terminated.
  • Step 405 When the OLT finds the multicast group corresponding to the multicast data, finds an OLT port corresponding to the multicast group according to the established multicast entry.
  • Step 406 Determine whether only a 1G-EPON ONU is added to the multicast group under the OLT port. If yes, go to step 407; otherwise, go to step 408.
  • the ONU logical link identifier of the multicast group that is added to the multicast group under each OLT port is found, and it is determined whether only the 1G-EPON ONU is added to the multicast group.
  • Step 407 After determining that only the 1 G-EPON ONU is added to the multicast group, the multicast data is sent to the ONU under the OLT port through the broadcast logical channel of the 0x7fff.
  • step 408 it is determined whether only the 10G-EPON ONU is added to the multicast group under the OLT port. If yes, go to step 409; otherwise, go to step 410.
  • Step 409 After determining that only the 10G-EPON ONU is added to the multicast group, the multicast data is sent to the ONU under the OLT port through the broadcast logical channel of 0x7ffe.
  • Step 410 Determine that both the 1G-EPON ONU and the 10G-EPON ONU join the multicast group under the OLT port, and send a multicast data to the OLT port through the broadcast logical channel of 0x7fff and the broadcast logical channel of 0x7ffe respectively. ONU.
  • the correspondence between the ONU logical link identifier and the ONU type on the OLT can be determined by using, but not limited to, the following two methods:
  • the first method is configured according to the value range of the ONU logical link identifier.
  • the value of the ONU logical link identifier is 1G-EPON ONU within a certain range and 10G-EPON ONU in another range.
  • the value of the ONU logical link identifier is greater than or equal to 0 and less than or equal to 64, it is an IG-EPON ONU; the value of the ONU logical link identifier is greater than or equal to 65, and is less than or When it is equal to 511, it is 10G-EPON ONU. Or, if the value of the ONU logical link identifier is greater than or equal to 0, and is less than or equal to 2047, it is 1G-EPON ONU; when the value of the ONU logical link identifier is greater than or equal to 2048, and less than or equal to 4095, it is 10G- EPON ONU.
  • Method 2 Determine dynamically according to system configuration or ONU registration.
  • the mapping between the ONU logical link identifier and the ONU type is saved in the OLT, and which ONU logical link identifiers are corresponding to the 1G-EPON ONU and which are corresponding to the 10G-EPON ONU, and are updated or manually when the ONU is registered. Configuration.
  • the present invention further provides a multicast processing apparatus, which is applicable to an OLT that connects different types of ONUs under the same port.
  • the apparatus includes: a data receiving module 10 and Data replication module 20.
  • the data receiving module 10 is configured to receive the multicast data.
  • the data replication module 20 is configured to: when the multicast data is copied, copy the multicast data to different broadcast or multicast logical channels according to the ONU type to which the user joining the multicast group belongs.
  • the data replication module 20 is further configured to: when a user of the same ONU type joins the multicast group in an OLT port corresponding to the multicast group, the multicast data is broadcasted or multicasted by the same ONU type.
  • the logical channel is sent to the ONU under the OLT port.
  • the packets are sent through the broadcast or multicast logical channels corresponding to the ONU types.
  • a multicast data is sent to the ONU under the OLT port.
  • the ONU type can be divided according to the rate.
  • the ONU type is divided into 1G-EPON ONU and 10G-EPON ONU according to the rate.
  • the device further includes an entry establishing module 30, configured to establish an information entry, where the information entry may include: a correspondence between an ONU logical link identifier and an ONU type, and an ONU logical chain.
  • the data replication module 20 is further configured to: according to the established information table The entry determines the user who joins the multicast group and the type of ONU to which it belongs.
  • the present invention achieves efficient processing of multicast when different types of ONUs coexist, and enables the ONU to distinguish whether the multicast data belongs to the ONU of the current type before performing the Layer 2 multicast forwarding process. Excessive data does not interfere with ONUs; at the same time, the bandwidth between the OLT and the ONU can be utilized efficiently, avoiding the use of bandwidth by meaningless data streams.

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Abstract

本发明公开了一种组播处理方法，包括：同一端口下连接不同类型的光网络单元（ONU）的光线路终端（OLT）在进行下行组播数据复制时，根据加入组播组的用户所属的ONU类型，复制组播数据到不同的广播或组播逻辑通道。本发明还公开了一种组播处理装置。通过本发明实现了不同类型的ONU共存时对组播的高效处理，避免过多数据对ONU不必要的干扰，同时可高效的利用OLT和ONU之间的带宽，避免无意义的数据流对带宽的占用。

Description

一种组播处理方法和装置 技术领域
本发明涉及无源光网络（PON )技术领域， 尤其涉及一种组播处理方 法和装置。 背景技术
无源光网络（ PON , Passive Optical Network ) 系统通常由局侧的光线 路终端（ OLT, Optical Line Terminal )、用户侧的光网络单元（ ONU, Optical Network Unit ) /光网给终端 ( ONT, Optical Network Termination )和光分配 网络（ODN, Optical Distribution Network )组成。 ODN由单模光纤、 分光 器和光连接器等无源光器件组成， 为 OLT和 ONU之间的物理连接提供光 传输媒质。 ODN通常为点到多点结构， 即一个 OLT通过 ODN连接多个 ONU。
以太网无源光网络（ EPON , Ethernet Passive Optical Network ) 于 电气和电子工程师十办会 ( IEEE , Institute of Electrical and Electronics Engineers ) 802.3-2005 Section 5和 IEEE802.3av标准的新一代宽带无源光综 合接入技术。
对于 EPON, IEEE标准仅仅定义了 1G-EPON和 10G-EPON的物理层 和链路层标准， 对于其他业务功能没有涉及。 对于组播， IEEE802.3-2005 Section 5标准定义了 1G-EPON的广播逻辑通道标识为 0x7fff; IEEE802.3av 标准定义了 10G-EPON的广播逻辑通道标识为 0x7ffe。通常， EPON的 OLT 在发送组播业务时， 会利用广播逻辑通道将组播流量发送到一个 PON口下 的所有端口； 然后， ONU再根据本地保存的组播和本地用户接口的对应表 确定向哪个端口进行组播业务的转发。 以上主要是针对 OLT下的一个端口上只连接有相同类型的 ONU时的 情况。
当不同类型 （如不同速率）的 ONU连接到同一 OLT的一个端口上时， 如图 1所示， OLT的端口 1连接的分光器 1下有 3个 ONU, 其中， ONU A 和 ONU B为 1G-EPON ONU, ONU C为 10G-EPON ONU。 在这种情况下， 关于 OLT如何使用广播或组播逻辑通道来发送组播报文， 现有的标准中没 有相关的规定， 因此， 如何高效地利用 PON的物理通道来实现组播业务的 转发是一个亟待解决的问题。 发明内容
有鉴于此， 本发明的主要目的在于提供一种组播处理方法和装置， 以 实现不同类型的 ONU共存时的组播处理。
为达到上述目的， 本发明的技术方案是这样实现的：
本发明提供了一种组播处理方法， 该方法包括：
同一端口下连接不同类型的光网络单元（ONU )的光线路终端（OLT ) 在进行下行组播数据复制时， 根据加入组播组的用户所属的 ONU类型， 复 制组播数据到不同的广播或组播逻辑通道。
该方法进一步包括： 如果所述组播组对应的某 OLT端口下只存在相同 ONU类型的用户加入组播组， 则将所述组播数据通过所述相同 ONU类型 所对应的广播或组播逻辑通道下发给所述 OLT端口下的 ONU。
该方法进一步包括： 如果所述组播组对应的某 OLT端口下同时存在不 同 ONU类型的用户加入组播组， 则分别通过各 ONU类型所对应的广播或 组播逻辑通道各发送一份组播数据给所述 OLT端口下的 ONU。
所述 ONU类型根据速率进行划分。
该方法进一步包括： 所述 OLT根据建立的各种信息表项确定加入组播 组的用户及其所属的 ONU类型。 所述信息表项包括： ONU逻辑链路标识与 ONU类型的对应关系， ONU 逻辑链路标识与 OLT端口的对应关系， 组播组与 ONU逻辑链路标识的对 应关系， 组播组与 OLT端口的对应关系。
本发明还提供了一种组播处理装置， 应用于同一端口下连接不同类型 的 ONU的 OLT, 该装置包括：
数据接收模块， 用于接收组播数据；
数据复制模块， 用于在进行组播数据复制时， 根据加入组播组的用户 所属的 ONU类型， 复制组播数据到不同的广播或组播逻辑通道。
所述数据复制模块进一步用于， 在所述组播组对应的某 OLT端口下只 存在相同 ONU类型的用户加入组播组时， 将所述组播数据通过所述相同 ONU类型所对应的广播或组播逻辑通道下发给所述 OLT端口下的 ONU。
所述数据复制模块进一步用于， 在所述组播组对应的某 OLT端口下同 时存在不同 ONU类型的用户加入组播组时， 分别通过各 ONU类型所对应 的广播或组播逻辑通道各发送一份组播数据给所述 OLT端口下的 ONU。
所述 ONU类型根据速率进行划分。
该装置进一步包括表项建立模块， 用于建立所述信息表项； 所述数据 复制模块进一步用于， 根据建立的信息表项确定加入组播组的用户及其所 属的 ONU类型。
所述信息表项包括： ONU逻辑链路标识与 ONU类型的对应关系， ONU 逻辑链路标识与 OLT端口的对应关系， 组播组与 ONU逻辑链路标识的对 应关系， 组播组与 OLT端口的对应关系。
本发明所提供的一种组播处理方法和装置， 在同一端口下连接不同类 型的 ONU的 OLT进行下行组播数据复制时， 根据加入组播组的用户所属 的 ONU类型， 复制组播数据到不同的广播或组播逻辑通道。 通过本发明实 现了不同类型的 ONU共存时对组播的高效处理， 且使 ONU在进行二层组 播转发处理之前就能区分出组播数据是否属于本类型的 ONU, 避免过多数 据对 ONU不必要的干扰； 同时可高效的利用 OLT和 ONU之间的带宽， 避 免无意义的数据流对带宽的占用。 附图说明
图 1为现有技术中 1G-EPON和 10G-EPON共存时的组网示意图； 图 2为本发明一种组播处理方法的流程图；
图 3为本发明实施例一的组播处理方法的流程图；
图 4为本发明实施例二的组播处理方法的流程图；
图 5为本发明一种组播处理装置的组成结构示意图。 具体实施方式 下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 本发明所提供的一种组播处理方法， 如图 2所示， 主要包括以下步骤： 步骤 201 ,同一端口下连接不同类型的 ONU的 OLT在进行下行组播数 据复制时， 确定加入组播组的用户所属的 ONU类型。
ONU类型可以根据速率进行划分， 例如： 在 EPON 中， 根据速率将 ONU类型划分为 1G-EPON ONU和 10G-EPON ONU。 当然，本发明并非仅 限于根据速率的划分， ONU类型的划分依据可以根据实际需要进行扩展。
步骤 202 , OLT根据加入组播组的用户所属的 ONU类型， 复制组播数 据到不同的广播或组播逻辑通道。
具体的， 如果组播组对应的某 OLT端口下只存在相同 ONU类型的用 户加入组播组，则将组播数据通过相同 ONU类型所对应的广播或组播逻辑 通道下发给 OLT端口下的 ONU; 如果组播组对应的某 OLT端口下同时存 在不同 ONU类型的用户加入组播组，则分别通过各 ONU类型所对应的广播 或组播逻辑通道各发送一份组播数据给该 OLT端口下的 ONU。 基于上述的组播处理方法， 在实际应用中 OLT接收到组播数据时， 可 以根据建立的各种信息表项确定加入组播组的用户及其所属的 ONU类型， 以及组播数据下发的 OLT端口，进而确定组播数据对应的各 OLT端口下是 否存在不同 ONU类型的用户。
较佳的， 信息表项可以包括： ONU逻辑链路标识与 ONU类型的对应 关系， ONU逻辑链路标识与 OLT端口的对应关系， 组播组与 ONU逻辑链 路标识的对应关系， 组播组与 OLT端口的对应关系等等。 组播组与 ONU 逻辑链路标识的对应关系， 以及组播组与 OLT端口的对应关系可以通过互 联网组管理协议 ( IGMP , Internet Group Management Protocol )的方式来实 现配置， 也可以通过网管配置。
OLT根据组播数据中携带的组播地址和相关信息确定对应的组播组， 并根据组播组查找组播组与 OLT 端口的对应关系， 获得与组播组对应的 OLT端口； 然后， OLT根据 ONU逻辑链路标识与 ONU类型的对应关系， ONU逻辑链路标识与 OLT端口的对应关系， 组播组与 ONU逻辑链路标识 的对应关系，确定加入组播组的用户及其所属的 ONU类型和加入组播组的 ONU逻辑链路标识； 进而判断各个 OLT端口下是否存在不同 ONU类型的 用户加入组播组。在确定组播数据对应的某个 OLT端口下只存在相同 ONU 类型的用户加入组播组时， OLT将组播数据通过该 ONU类型所对应的广播 或组播逻辑通道下发给该 OLT端口下的 ONU。在确定组播数据对应的某个 OLT端口下同时存在不同 ONU类型的用户加入组播组时， OLT分别通过各 ONU类型所对应的广播或组播逻辑通道各发送一份组播数据给该 OLT端口下 的 ONU。
以 ONU类型划分为 1G-EPON ONU和 10G-EPON ONU为例，如果 OLT 确定某个端口下只存在 1G-EPON ONU类型的用户加入组播组， 则将组播 数据通过 1G-EPON ONU类型所对应的广播逻辑通道下发给该 OLT端口下 的 ONU, 即通过标识为 0x7fff 的广播逻辑通道下发给该 OLT 端口下的 ONU; 如果 OLT确定某个端口下只存在 10G-EPON ONU类型的用户加入 组播组， 则将组播数据通过 10G-EPON ONU类型所对应的广播逻辑通道下 发给该 OLT端口下的 ONU,即通过标识为 0x7ffe的广播逻辑通道下发给该 OLT端口下的 ONU;如果 OLT确定在某个端口下同时存在 1G-EPON ONU 类型和 10G-EPON ONU 类型的用户加入组播组， 则将组播数据分别通过 1G-EPON ONU类型所对应的广播逻辑通道（标识为 0x7fff 的广播逻辑通 道）， 以及 10G-EPON ONU类型所对应的广播逻辑通道（标识为 0x7ffe的 广播逻辑通道）各下发一次组播数据。 通过这样的两次发送， 能够保证该 OLT端口下的 1G-EPON ONU和 10G-EPON ONU都能接收到组播数据。
下面以 EPON中的组播处理为例， 对上述的组播处理方法进一步详细 阐述。但是本发明的组播处理方法并非仅限于适用 EPON,对于其他类型的 PON也是适用的。
在本发明的实施例一中，采用 IGMP组播管理协议的实现方法。在 OLT 上需要建立信息表项， 包括两级组播表项和其他对应关系， 第一级组播表 项用于确定 OLT端口， 第二级组播表项用于确定广播逻辑通道。 组播表项 和其他对应关系的建立操作具体为：
1、 在 OLT中建立 ONU逻辑链路标识与 ONU类型的对应关系 （记为 对应关系 1 ) , 用以标识哪些 ONU逻辑链路标识对应的是 1 G-EPON , 哪些 对应的是 10G-EPON;
2、 对于 IGMP动态组播， 在收到来自 ONU的 IGMP报告 ( Report )报 文时， OLT建立或更新组播组与 ONU逻辑链路标识的对应关系（记为对应 关系 2 ), 以及组播组与 OLT端口的对应关系（记为对应关系 3 ), 由对应关 系 2和对应关系 3构成第一级组播表项；
3、 根据上述对应关系 1和第一级组播表项 （包括对应关系 2、 对应关 系 3 ),在每个 OLT端口建立或更新组播组与广播逻辑通道标识的对应关系 (记为对应关系 4 ), 对应关系 4中的成员可以为 1G-EPON对应的广播逻 辑通道标识（0x7fff )和 /或 10G-EPON对应的广播逻辑通道标识（ 0x7ffe ), 具体如下表 1所示：
Figure imgf000009_0001
表 1
对应关系 4即构成所述的第二级组播表项。
在上述信息表项的基础上所实现的组播处理方法， 如图 3所示， 主要 包括以下步骤：
步骤 301 , OLT通过自身的上联端口接收组播数据。
步骤 302~303 , OLT根据组播数据中携带的组播地址和相关信息查找与 该组播数据相对应的组播组， 如果查找到对应的组播组， 则执行步骤 305； 否则， 执行步骤 304。
其中， 相关信息包括 VLAN或组播源地址等等。 本发明的实施例一中 以 VLAN为例进行说明， OLT既可以只根据组播地址查找与组播数据相对 应的组播组， 也可以根据组播地址和 VLAN查找与组播数据相对应的组播 组。
步骤 304, 在 OLT没有查找到与该组播数据相对应的组播组时， 将该 组播数据分发到 VLAN的所有端口， 操作执行完毕后结束整个流程。
步骤 305~306 , 在 OLT查找到与该组播数据相对应的组播组时， 根据 建立的组播表项， 查找到与该组播组相对应的 OLT端口， 并将组播数据复 制 （或称发送 )到该 OLT端口。
OLT根据查找到的组播组查找对应关系 3 , 得到与该组播组相对应的 OLT端口。
步骤 307~308 , 在需要发送组播数据的 OLT端口查找与组播数据相对 应的组播组， 如果存在对应的组播组， 则执行步骤 309; 否则， 结束整个流 程。
步骤 309, 在 OLT端口根据组播组查找建立的组播表项， 得到各组播 成员所对应的广播逻辑通道， 并将组播数据复制到该广播逻辑通道上发送 给该 OLT端口下的 ONU。
在本发明的实施例二中，采用 IGMP组播管理协议的实现方法。在 OLT 上需要建立一级组播表项， 用于确定 OLT端口， 另外还需建立其他对应关 系用于确定加入组播组的用户及其所属的 ONU类型。一级组播表项和其他 对应关系 （都属于信息表项） 的建立操作具体为：
1、 在 OLT中建立 ONU逻辑链路标识与 ONU类型的对应关系 （记为 对应关系 1 ), 用以标识哪些 ONU逻辑链路标识对应的是 1G-EPON, 哪些 对应的是 10G-EPON;
2、 在 ONU注册时， 在 OLT上建立 OLT端口与 ONU逻辑链路标识的 对应关系 （记为对应关系 5 )。
3、 对于 IGMP动态组播， 在收到来自 ONU的 IGMP Report报文时， 建立或更新组播组与 ONU逻辑链路标识的对应关系 （记为对应关系 2 ), 以及组播组与 OLT端口的对应关系 （记为对应关系 3 ); 对应关系 2和对应 关系 3即构成本实施例所指的一级组播表项。
在上述信息表项的基础上所实现的组播处理方法， 如图 4所示， 主要 包括以下步骤：
步骤 401 , OLT通过自身的上联端口接收组播数据。
步骤 402~403 , OLT根据组播数据中携带的组播地址和 VLAN查找与 该组播数据相对应的组播组， 如果查找到对应的组播组， 则执行步骤 405； 否则， 执行步骤 404。
步骤 404, 在 OLT没有查找到与该组播数据相对应的组播组时， 将该 组播数据分发到 VLAN的所有端口， 操作执行完毕后结束整个流程。
步骤 405, 在 OLT查找到与该组播数据相对应的组播组时， 根据建立 的组播表项， 查找到与该组播组相对应的 OLT端口。
步骤 406, 判断在该 OLT端口下是否只存在 1G-EPON ONU加入组播 组， 如果是， 执行步骤 407; 否则， 执行步骤 408。
根据对应关系 5 ,查找各 OLT端口下加入组播组的 ONU逻辑链路标识， 并依此判断是否只存在 1G-EPON ONU加入组播组。
步骤 407 , 在判断 OLT端口下只有 1 G-EPON ONU加入组播组， 则将 组播数据通过 0x7fff的广播逻辑通道发送给该 OLT端口下的 ONU。
步骤 408,判断在该 OLT端口下是否只存在 10G-EPON ONU加入组播 组， 如果是， 执行步骤 409; 否则， 执行步骤 410。
根据对应关系 5 ,查找各 OLT端口下加入组播组的 ONU逻辑链路标识， 并依此判断是否只存在 10G-EPON ONU加入组播组。
步骤 409, 在判断 OLT端口下只有 10G-EPON ONU加入组播组， 则将 组播数据通过 0x7ffe的广播逻辑通道发送给该 OLT端口下的 ONU。
步骤 410 ,确定该 OLT端口下同时有 1G-EPON ONU和 10G-EPON ONU 加入组播组， 并分别通过 0x7fff 的广播逻辑通道和 0x7ffe的广播逻辑通道 各发送一份组播数据给该 OLT端口下的 ONU。
需要指出的是， OLT上 ONU逻辑链路标识与 ONU类型的对应关系可 以采用但不限于以下两种方法来确定：
方法一， 根据 ONU逻辑链路标识的取值范围配置。 规定 ONU逻辑链 路标识的值在一定范围内为 1G-EPON ONU, 在另一范围内为 10G-EPON ONU。
例如： 规定 ONU逻辑链路标识的值大于或等于 0, 且小于或等于 64 时， 为 IG-EPON ONU; ONU逻辑链路标识的值大于或等于 65, 且小于或 等于 511时， 为 10G-EPON ONU。 或者， 规定 ONU逻辑链路标识的值大 于或等于 0, 且小于或等于 2047时， 为 1G-EPON ONU; ONU逻辑链路标 识的值大于或等于 2048, 且小于或等于 4095时， 为 10G-EPON ONU。
方法二： 根据系统配置或者 ONU注册情况动态确定。 在 OLT中保存 ONU逻辑链路标识与 ONU类型的对应关系，标识出哪些 ONU逻辑链路标 识对应的是 1G-EPON ONU,哪些对应的是 10G-EPON ONU,并在 ONU注 册时进行更新或手动配置。
为实现上述组播处理方法， 本发明还提供了一种组播处理装置， 该装 置适用于同一端口下连接不同类型的 ONU的 OLT, 如图 5所示， 该装置包 括： 数据接收模块 10和数据复制模块 20。 数据接收模块 10, 用于接收组 播数据。 数据复制模块 20, 用于在进行组播数据复制时， 根据加入组播组 的用户所属的 ONU类型， 复制组播数据到不同的广播或组播逻辑通道。
较佳的，数据复制模块 20进一步用于，在组播组对应的某 OLT端口下 只存在相同 ONU类型的用户加入组播组时， 将组播数据通过相同 ONU类 型所对应的广播或组播逻辑通道下发给 OLT端口下的 ONU;在组播组对应 的某 OLT端口下同时存在不同 ONU类型的用户加入组播组时，分别通过各 ONU类型所对应的广播或组播逻辑通道各发送一份组播数据给该 OLT端口下 的 ONU。
其中， ONU类型可以根据速率进行划分， 例如： 在 EPON中， 根据速 率将 ONU类型划分为 1G-EPON ONU和 10G-EPON ONU。
较佳的， 在该装置在上述模块的基础上进一步包括表项建立模块 30, 用于建立信息表项， 该信息表项可以包括： ONU逻辑链路标识与 ONU类型 的对应关系， ONU逻辑链路标识与 OLT端口的对应关系， 组播组与 ONU逻 辑链路标识的对应关系， 组播组与 OLT端口的对应关系等等； 相应的， 数据 复制模块 20进一步用于， 根据建立的信息表项确定加入组播组的用户及其 所属的 ONU类型。 综上所述，通过本发明实现了不同类型的 ONU共存时对组播的高效处 理，且使 ONU在进行二层组播转发处理之前就能区分出组播数据是否属于 本类型的 ONU, 避免过多数据对 ONU不必要的干扰； 同时可高效的利用 OLT和 ONU之间的带宽， 避免无意义的数据流对带宽的占用。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种组播处理方法， 其特征在于， 该方法包括：
同一端口下连接不同类型的光网络单元（ONU )的光线路终端（OLT ) 在进行下行组播数据复制时， 根据加入组播组的用户所属的 ONU类型， 复 制组播数据到不同的广播或组播逻辑通道。
2、 根据权利要求 1所述组播处理方法， 其特征在于， 该方法进一步包 括： 如果所述组播组对应的某 OLT端口下只存在相同 ONU类型的用户加 入组播组，则将所述组播数据通过所述相同 ONU类型所对应的广播或组播 逻辑通道下发给所述 OLT端口下的 ONU。
3、 根据权利要求 1所述组播处理方法， 其特征在于， 该方法进一步包 括： 如果所述组播组对应的某 OLT端口下同时存在不同 ONU类型的用户 加入组播组，则分别通过各 ONU类型所对应的广播或组播逻辑通道各发送一 份组播数据给所述 OLT端口下的 ONU。
4、根据权利要求 1、 2或 3所述组播处理方法，其特征在于，所述 ONU 类型根据速率进行划分。
5、 根据权利要求 1、 2或 3所述组播处理方法， 其特征在于， 该方法 进一步包括： 所述 OLT根据建立的各种信息表项确定加入组播组的用户及其 所属的 ONU类型。
6、 根据权利要求 5所述组播处理方法， 其特征在于， 所述信息表项包 括： ONU逻辑链路标识与 ONU类型的对应关系， ONU逻辑链路标识与 OLT 端口的对应关系，组播组与 ONU逻辑链路标识的对应关系，组播组与 OLT端 口的对应关系。
7、一种组播处理装置，应用于同一端口下连接不同类型的 ONU的 OLT, 其特征在于， 该装置包括：
数据接收模块， 用于接收组播数据； 数据复制模块， 用于在进行组播数据复制时， 根据加入组播组的用户 所属的 ONU类型， 复制组播数据到不同的广播或组播逻辑通道。
8、 根据权利要求 7所述组播处理装置， 其特征在于， 所述数据复制模 块进一步用于， 在所述组播组对应的某 OLT端口下只存在相同 ONU类型 的用户加入组播组时，将所述组播数据通过所述相同 ONU类型所对应的广 播或组播逻辑通道下发给所述 OLT端口下的 ONU。
9、 根据权利要求 7所述组播处理装置， 其特征在于， 所述数据复制模 块进一步用于， 在所述组播组对应的某 OLT端口下同时存在不同 ONU类 型的用户加入组播组时，分别通过各 ONU类型所对应的广播或组播逻辑通道 各发送一份组播数据给所述 OLT端口下的 ONU。
10、 根据权利要求 7、 8或 9所述组播处理装置， 其特征在于， 所述 ONU类型根据速率进行划分。
11、 根据权利要求 7、 8或 9所述组播处理装置， 其特征在于， 该装置 进一步包括表项建立模块， 用于建立所述信息表项； 所述数据复制模块进 一步用于，根据建立的信息表项确定加入组播组的用户及其所属的 ONU类 型。
12、 根据权利要求 11所述组播处理装置， 其特征在于， 所述信息表项 包括： ONU逻辑链路标识与 ONU类型的对应关系， ONU逻辑链路标识与 OLT 端口的对应关系，组播组与 ONU逻辑链路标识的对应关系，组播组与 OLT端 口的对应关系。
PCT/CN2009/076031 2009-07-15 2009-12-25 一种组播处理方法和装置 WO2011006339A1 (zh)

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