CN101222414B - Device, system and method for implementing multicast communication - Google Patents

Device, system and method for implementing multicast communication Download PDF

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CN101222414B
CN101222414B CN 200710000227 CN200710000227A CN101222414B CN 101222414 B CN101222414 B CN 101222414B CN 200710000227 CN200710000227 CN 200710000227 CN 200710000227 A CN200710000227 A CN 200710000227A CN 101222414 B CN101222414 B CN 101222414B
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multicast
eid
ip address
source
information
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CN 200710000227
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CN101222414A (en
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关建峰
周华春
张宏科
杨冬
杨水根
王博
秦雅娟
董平
马建文
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北京交通大学
华为技术有限公司
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Abstract

The embodiment of the invention provides a device for realizing the multicast communication, a system and a method. The device comprises an identity resolving server; the system comprises an SM, an access route, a receiver and an identity resolving server; the method mainly comprises the following steps that: the SM obtains and stores all mapping relation information between EID of all nodes and IP addresses; according to the EID information of all the nodes, a multicast tree is established and controlled; the multicast communication between the SM and the receiver is realized by the transferof the access route according to the multicast tree and the IP address information of the nodes. The invention ensures that an intermediate node in the network takes charge of transmitting the multicast communication message without storing the state information of an application layer multicast tree or maintaining the application layer multicast tree, thereby effectively reducing the burden of amiddle layer.

Description

实现组播通信的装置、系统和方法 Apparatus, system and method for multicast communication

技术领域 FIELD

[0001] 本发明涉及通信领域,尤其涉及一种实现组播通信的装置、系统和方法。 [0001] The present invention relates to communication field, and particularly relates to an apparatus, system and method to realize multicast communication.

背景技术 Background technique

[0002] 组播是一种优化使用网络带宽资源的技术。 [0002] Multicast is a technique using an optimized network bandwidth resources. 采用组播技术能够允许数据流从一个或多个数据源发送到多个目的地。 Multicast technology can allow data stream transmitted from one or more data sources to multiple destinations. 可以避免不必要的数据包复制,有利于减少骨干网络流量,从而更有效地利用网络资源。 Avoid unnecessary packet replication helps to reduce the backbone network traffic, thus more efficient use of network resources.

[0003]目前,组播主要分为IP组播和应用层组播(也称为overlay组播)两大类。 [0003] At present, IP multicast and multicast divided into ALM (also known as overlay multicast) two categories. 在传统的IP组播模型中,组播接收者和组播路由器之间采用组管理协议进行交互,组管理协议包括:IGMP(针对IPv4的组管理协议)和MLD(针对IPv6的组管理协议)。 In traditional IP multicast model, a multicast receiver employed between the router and the multicast group management protocol interaction, including Group Management Protocol: IGMP (Group Management Protocol for IPv4), and the MLD (for Group Management Protocol for IPv6) . 路由器之间则采用组播路由协议来建立、更新和维护组播树,路由器根据该组播树得出复制和分发组播报文的路径。 Is used between routers multicast routing protocol to establish, update and maintain the multicast tree, routers come to copy and distribute multicast packet paths from the multicast tree. 组管理协议所收集的数据库被组播路由协议用来判断在本地子网上是否存在组播接收者,保证组播接收者收到其所请求的组播报文。 Group Management Protocol database collected by multicast routing protocols used to determine whether there are multicast receivers on the local subnet, ensure that the recipient received the multicast group it requested multicast packets.

[0004] 目前,IP组播业务模型主要包括两种:ASM(任意源组播)模型和SSM(特定源组播)模型。 [0004] At present, IP multicast service model includes two kinds: ASM (Any Source Multicast) model and the SSM (Source Specific Multicast) model. IP组播具有网络利用率高、能节省发送者自身的资源的优点,适合于实时、不可靠的应用。 IP Multicast with high network utilization, energy saving advantages of the sender's own resources, suitable for real, not reliable applications. 但是,IP组播也存在以下问题: However, IP multicast also the following problems:

[0005] I、路由器必须为每个组播组保存状态,扩展性差; [0005] I, the router must save the state of each multicast group, poor scalability;

[0006] 2、要求所有路由器都支持组播路由协议,不利于推广使用; [0006] 2, requires that all routers support multicast routing protocols, is not conducive to the promotion of the use;

[0007] 3、用统一的模型来适应所有的应用,算法设计困难; [0007] 3, with a unified model to suit all applications, algorithm design difficulties;

[0008] 4、对组播组进行加入、退出等管理的开销大。 [0008] 4, were added overhead and exit management of large multicast groups.

[0009] 应用层组播的基本特点是保持互联网原有的简单、不可靠、单播的转发模型,由端系统实现组播转发功能。 [0009] The basic characteristics of ALM is simple to maintain the original Internet, unreliable, model unicast forwarding, multicast forwarding by the end system. 应用层组播技术需要基于下列先决条件: ALM technology needs based on the following prerequisites:

[0010] I、网络的带宽和转发资源相对丰富,其中服务器的处理能力是主要瓶颈; [0010] I, network bandwidth and forwarding resources are relatively abundant, wherein the processing power of the server is the main bottleneck;

[0011] 2、组播组成员可提供资源用于转发; [0011] 2, multicast group members can provide resources for forwarding;

[0012] 3、应用对性能的要求并不苛刻,可容忍报文丢失和较大的时延。 [0012] 3, the application performance requirements is not critical, and can tolerate packet loss greater delay.

[0013] 在应用层组播技术中,组播组的成员通过建立覆盖组播树的方式来相互连接。 [0013] in an application layer multicast technology, multicast group members connected to each other by establishing a multicast tree cover. 所有的组播功能,如组成员管理、数据包复制等功能都在终端上实现。 All multicast function, such as group membership management, packet replication and other functions are implemented in the terminal. 应用层组播协议在把各个组成员组织在一起时,在它们之间构造了两个拓扑:控制拓扑和数据拓扑。 Application layer multicast protocol when the group members are organized, are configured between the two topologies: control topology and topology data. 其中数据拓扑是一棵组播分发树,它定义了数据在组成员之间分发的路径;控制拓扑则是一个网状结构,它的目的在于增加组成员之间的连通性和健壮性。 Wherein the data is a multicast distribution tree topology, which defines the path of data distributed among group members; control topology is a mesh structure, its object and robustness communication between group members is increased.

[0014] 应用层组播具有下列优势:只需改变端系统,便于实现和推广;便于针对特定应用进行优化。 [0014] ALM following advantages: the system simply by changing the end, and facilitate promotion; facilitate optimized for specific applications. 但是,由于应用层组播不考虑IP层的路由和数据转发,因此,它的效率比IP组播低,延迟、转发速率等性能比IP组播低。 However, since the application layer multicast IP layer without considering routing and data forwarding, and therefore, its efficiency is lower than the IP multicast, delay, forwarding rate properties lower than IP multicast. 目前,应用层组播主要用于实时的多媒体传输,如视频会议系统、媒体流的分发系统(如视频广播)和订阅/分发系统。 Currently, ALM is mainly used for real-time transmission of multimedia, such as video conferencing systems, media stream distribution system (such as video broadcast) and subscription / distribution system.

[0015] 近年来,随着无线技术的发展,越来越多的人通过无线设备连接到互联网上,支持移动成为了互联网发展的必然要求。 [0015] In recent years, with the development of wireless technology, more and more people connect to the Internet through wireless devices, it has become a necessary requirement to support mobile Internet development. 移动和组播的结合将会进一步扩大移动和组播的应用范围,为两者的应用提供更为广泛的发展空间。 In conjunction with mobile multicast and will further expand the scope of application of mobile and multicast to provide a broader space for development of both applications. 但是,移动和组播的结合给两者都带来了新的挑战。 However, the combination of mobile and multicast to bring both new challenges. 在移动环境中,组播不仅需要管理动态组播组成员、建立和维护组播树,还需要解决组成员位置动态变化的问题。 In the mobile environment, not only need to manage dynamic multicast multicast group members to establish and maintain multicast tree, but also need to address the dynamic changes of group member location. 但现在互联网中使用的组播协议通常都假设其组成员是静态的,而没有考虑组成员位置动态变化的情况。 But now the multicast protocol used on the Internet are usually assumed to be a member of the group is static, without taking into account the dynamic change of group member location. 如果每次组成员位置移动后,都当作一个新加入的组成员,则会给组播组的管理和组播树的维护带来过多的开销,增加网络的负担;另夕卜,组成员的移动还会造成切换时延、丢包等现象,不能满足实时多媒体应用。 If each team member position, both as a group of new members, the management and maintenance of the multicast tree multicast group will bring too much overhead, increase the burden on the network; the other evening Bu group members of the movement will cause handoff delay, packet loss and other phenomena, can not meet the real-time multimedia applications.

[0016] 传统的TCP/IP协议主要用于固定节点之间的通信。 [0016] The traditional TCP / IP protocol used primarily for communication between the fixed nodes. 在传统的基于TCP/IP协议栈的互联网体系结构中,IP地址既作为主机的身份标识,也作为主机的位置标识,当主机的IP地址变化时,该主机原来建立的传输连接将被中断,需要重新建立连接,不利于支持主机的移动性。 In the traditional Internet architecture is based on TCP / IP protocol stack, IP address as both the identity of the host, but also as a location identifier of the host, when the host's IP address changes, the transport connection to the host originally created will be interrupted, need to re-establish the connection, it is not conducive to mobility support host.

[0017]目前,有许多方案,如HIP(主机标识符协议)等,对传统的TCP/IP协议进行了重新设计,以便使互联网支持移动性。 [0017] Currently, there are many programs, such as the HIP (Host Protocol Identifier) ​​or the like, the traditional TCP / IP protocol has been redesigned to enable the Internet to support mobility. HIP提出了一种基于身份与位置分离的机制,把传统IP地址的双重功能进行分离,IP地址只作为主机的位置标识;同时引入一个新的名字空间:端主机标识符,使用端主机标识符作为主机的身份标识。 HIP proposes a mechanism based on the identity and location separation, the dual functions of traditional IP address of the separation, the IP address of the host merely as a location identifier; while the introduction of a new name space: end host identifier, using the end of the host identifier logo identity as the host. 这种身份与位置分离的机制,使得即使节点的IP地址改变,传输层的连接也不会中断,不需要重新建立连接。 Such identity and location of the separation mechanism, so that even if the IP address of the node is changed, the transport layer connection is not interrupted, need to re-establish the connection.

[0018] 现有技术中一种应用层组播方案为:Bayeux应用层组播技术方案。 [0018] The prior art is an application layer multicast scheme: Bayeux application layer multicast scheme. 该方案基于Tapestry路由机制。 This solution is based Tapestry routing mechanism. 网络中每个节点都拥有一个全球唯一的标识符ID,该ID独立于节点的位置,和节点的位置无关。 Each network node has a globally unique identifier ID, which is independent of the location of the nodes, the nodes and location-independent. 网络中每个节点都必须维护一个邻居表项,在这个邻居表项中,邻居节点的ID和本节点的ID具有一定数量的相同位。 Each network node must maintain a neighbor entry in the neighbor table entry, the neighbor node ID and the node ID of a number of bits having the same. 在进行数据包的转发时,第η跳节点的ID和目的节点的ID至少有η位相同。 During forward packets, ID ID of the destination node and hop η η has at least the same position. 当某个中间节点进行数据包转发时,如果该中间节点的ID和目的节点的ID有η位相同,则该中间节点查询自己的邻居表项,查看是否有和目的节点的ID有η+1位相同的节点,如果有,则中间节点把查找到的节点作为自己的下一跳节点,同时把数据包转发给该下一跳节点。 When an intermediate node forwards the data packet, if the destination node ID and the ID of the intermediate node [eta] have the same position, the intermediate node then queries its neighbor entry to see if the destination node ID and have η + 1 bits of the same node, if so, to find an intermediate node to node as its next hop node, while forwarding packets to the next hop node.

[0019] 在该方案中,使用了特殊的逻辑结构对组播节点进行映射或编址。 [0019] In this embodiment, a special configuration of the logical nodes multicast addressing or mapping. 每个组播会话由〈会话名字,UID>共同表示,其中会话名字描述了该组播的内容,UID表示该会话的一个特殊实例。 Each multicast session <, UID session name> is represented by a common, wherein the session name describes the contents of the multicast, the UID indicates a specific example of the session. 在建立覆盖组播树时,组播源以自己为根节点,每个中间节点根据自己邻居表项中的内容建立相应的转发表,最终形成全网覆盖组播树。 When establishing coverage multicast tree, the multicast source as a root node in themselves, each intermediate node to establish the corresponding forwarding entry according to the contents of their neighbors, eventually covering the entire network multicast tree. 一个简单的Bayeux覆盖组播树示意图如图I所示,图I中节点内的数字代表该节点的ID。 A simple cover Bayeux multicast tree diagram shown in Figure I, the numbers in Figure I are representative of the node ID of the node.

[0020] 在图I所示的Bayeux覆盖组播树中,若接收者3360希望接入7876组播组,则3360发送加入消息给7876,该消息经过的路径是x360、xx60、xxx0、7876。 [0020] In Bayeux coverage multicast tree shown in FIG. I, 3360, if the recipient desires access to the multicast group 7876, then sends a Join message 3360 to 7876, the message path through a x360, xx60, xxx0,7876. 当组播源7876接收到该加入消息后,给接收者3360返回应答消息。 When the multicast source 7876 after receiving the join message 3360 returns a response message to the recipient. 组播源、接收者3360、该应答消息所经过的中间节点共同构建了一个覆盖组播树。 Multicast source, the recipient 3360, the response message passes the intermediate nodes together to build an overlay multicast tree. 由于Tapestry路由机制的非对称性,接收者发送加入报文所经过的路径和最终形成的覆盖组播树中的路径并不一定相等。 Since asymmetry Tapestry routing mechanism, the receiver sends a join message and the path the path coverage multicast tree finally formed are not necessarily equal.

[0021] Bayeux应用层组播技术在Tapestry路由机制的基础上,将覆盖组播树的状态信息保存在中间节点上,利用Tapestry路由机制将报文转发出去,使得组播转发可以使用简单的规则实现,从而减少了状态维护开销和转发开销,避免路由协议的使用。 Status [0021] Bayeux application layer multicast routing mechanism based on the Tapestry, the overlay multicast tree information is stored in the intermediate node, using Tapestry routing mechanism forwards packets, multicast forwarding such a simple rule may be used implementation, thereby reducing maintenance costs state and forwarding costs, avoid the use of routing protocols.

[0022] 上述现有技术的应用层组播方案的缺点为: [0022] The disadvantage of the application layer multicast scheme of the prior art:

[0023] I :在该方案中,逻辑空间中节点间的关系并不能对应实际网络中的关系,也就是组播树中节点间的关系并不能对应实际网络中的关系,因此从组播树中得到的报文转发路径并不一定是最短路径,使得报文的转发存在较大的延迟。 [0023] I: In this embodiment, the relationship between the nodes in the logical space and not the actual correspondence relationship of the network, i.e. the relationship between the multicast node in the tree and not in the correspondence relationship between the actual network, so the multicast tree obtained in the packet forwarding path is not necessarily the shortest path, so that there is a large packet forwarding delay.

[0024] 2 :在该方案中,中间节点需要保存应用层组播树的状态信息,对应用层组播树进行维护,因此,加重了中间节点的负担。 [0024] 2: In this embodiment, the intermediate node need to save the state information of the application layer multicast tree, the application layer multicast tree maintenance, and therefore, burdens intermediate node.

发明内容 SUMMARY

[0025] 本发明实施例的目的是提供一种实现组播通信的装置、系统和方法,从而可以使网络中的中间节点不需要保存应用层组播树的状态信息,不需要对应用层组播树进行维护,只负责进行组播数据报文的转发,从而有效地减轻中间层的负担。 [0025] The object of embodiments of the present invention is to provide an apparatus status information, system and method to realize multicast communication, thereby the intermediate node in the network does not need to save the application layer multicast tree, does not require the application layer group multicast tree maintenance only responsible for forwarding multicast packets, thus effectively reduce the burden on the middle layer. [0026] 本发明实施例的目的是通过以下技术方案实现的: [0026] The object of the present invention, an embodiment is achieved by the following technical solution:

[0027] —种身份解析服务器,包括: [0027] - kind of identity resolution server, including:

[0028] 映射关系保存模块:用于保存所有节点和组播源的端主机标识符EID和IP地址,以及EID和IP地址之间的映射关系信息; [0028] module stored mapping relationship: for all the nodes and end-host to save the multicast source identifier EID and the mapping relationship between the IP address and IP address information and EID;

[0029] 映射关系管理模块:用于对映射关系保存模块保存的所述EID和IP地址,以及EID和IP地址之间的映射关系信息进行增加、更新和删除中的至少一项操作; [0029] The mapping relationship management module: a mapping relationship between the stored mapping relationship storing module and the IP address of the EID, EID and IP address information, and add, update, and delete at least one operation;

[0030] 映射关系解析模块:用于根据节点发送的携带EID信息的解析请求,查询映射关系保存模块中保存的所述映射关系信息,获得所述解析请求中携带的EID对应的IP地址信息,将该IP地址信息返回给所述节点; [0030] The parsing module mapping relationship: according EID resolution request carries information sent by the node, a query mapping the mapping relationship information stored in the storing module to obtain the parsing EID corresponding IP address information carried in the request, returning the IP address information to the node;

[0031] 所述的映射关系管理模块具体包括: [0031] The mapping relationship management module comprises:

[0032] 节点地址更新模块:用于根据节点发送的携带其最新的IP地址信息的地址更新报文,对所述节点的IP地址信息,以及所述节点的EID和IP地址之间的映射关系信息进行更新; [0032] node address updating module: The portable for its new IP address information of the address update message sent by the node, IP address information of the node, the EID and the mapping relationship between the IP address of the node and information is updated;

[0033] 组播源地址更新模块:用于根据组播源发送的携带其最新的IP地址信息的地址更新报文,对所述组播源的IP地址信息,以及所述组播源的EID和IP地址之间的映射关系信息进行更新。 [0033] updating module multicast source address: the address used to carry the IP address of the latest updated information packets according to the multicast source, the EID IP address information of the multicast source and the multicast source and the mapping between the IP address information updated.

[0034] 一种实现组播通信的系统,包括: [0034] A system for implementing multicast communication, comprising:

[0035] 组播源:用于获取并保存所有节点的EID和IP地址之间的映射关系信息;根据所有节点的EID信息来构建和管理组播树,根据该组播树和节点的IP地址信息通过接入路由器的中转和节点之间进行组播通信; [0035] Multicast source: means for acquiring and storing the mapping relation information between all nodes and the IP address of the EID; constructed according to the EID and the management information for all nodes in the multicast tree, IP address, and based on the multicast tree nodes information by multicast communication between the access router and the relay node;

[0036] 接入路由器:使用开放最短路径优先OSPF协议在组播源和接收者之间进行组播数据报文的传递; [0036] The access router: using Open Shortest Path First OSPF protocol for transmitting multicast packets between the multicast source and the receivers;

[0037] 接收者:给组播源发送组播加入请求报文,加入相应的组播组;通过接入路由器的中转和组播源之间进行组播通信; [0037] Recipient: transmitting a multicast source to join a multicast request message, adding the corresponding multicast group; multicast communication via transit between the access router and the multicast source;

[0038] 身份解析服务器:用于保存、解析和管理网络中所有节点和组播源的EID和IP地址,以及EID和IP地址之间的映射关系信息。 [0038] Identity resolution server: to save the mapping between the EID and the IP addresses of all the nodes and the multicast source parsing and management of the network, as well as EID and IP address information.

[0039] 一种实现组播通信的方法,设置身份解析服务器,通过该身份解析服务器来保存、解析和管理网络中所有节点和组播源的EID和IP地址,以及EID和IP地址之间的映射关系信息,所述的方法具体包括: Between [0039] A method for realizing multicast communication, setting resolution server identity, the identity preserved by resolution server, and the IP addresses of all EID multicast source nodes and network management and analysis, as well as an IP address and EID the method of mapping relationship information, which specifically includes:

[0040] 组播源获取并保存所有节点的EID和IP地址之间的映射关系信息;根据所有节点的EID信息来构建和管理组播树;[0041] 所述组播源根据所述组播树和节点的IP地址信息通过接入路由器的中转,和接收者之间进行组播通信。 [0040] Multicast source acquiring and storing a mapping relationship between all nodes and the IP address of the EID; constructed according to the EID and the management information for all nodes in a multicast tree; [0041] according to the multicast source of said multicast IP multicast communication between the tree and the node address information of the access router by transfer, and the recipient.

[0042] 由上述本发明实施例提供的技术方案可以看出,本发明实施例通过用EID(端主机标识符)表示节点的身份标识,用IP地址表示节点的位置标识;设置IRS (身份解析服务器)来保存、解析和管理节点的EID和IP地址之间的映射关系。 [0042] The technical solution provided by the embodiment of the present invention can be seen, embodiments of the present invention represented by the embodiment of the identity of the node with the EID (end host identifier) ​​indicating the location of the IP address identifies the node; providing the IRS (Identity resolution server) to save the mapping between the EID resolution and management nodes and IP addresses. 和现有技术相比,具有如下优点: And compared to the prior art, it has the following advantages:

[0043] I、网络中的中间节点不需要保存应用层组播树的状态信息,也不需要对应用层组播树进行维护,只是负责进行组播数据报文的转发,因此,减轻了中间节点的负担。 [0043] I, an intermediate node in the network does not need to save state information application layer multicast tree, nor the need for application layer multicast tree maintenance, but is responsible for forwarding multicast packets, thus, reducing the middle burden node.

[0044] 2、在IP层,网络中的路由器根据源节点和目的节点的IP地址,使用0SPF(最短路径优先路由协议)进行选路和组播数据报文的转发,使得组播数据报文的转发路径是最短路径。 [0044] 2, at the IP layer router based on the IP network address of the source node and the destination node, using 0SPF (Shortest Path First) routing for multicast data packets and forwarding the multicast packet such that the forwarding path is the shortest path.

[0045] 3、组播源根据节点的身份信息来建立组播树,当组播源或接收者发生移动时,不需要改变组播树的拓扑关系,使得固定节点和移动节点都以一种统一的方式进行组播通ί目。 [0045] 3, used to establish a multicast tree according to the identity information of the multicast node, when the multicast source or receiver moves, without changing the topology of the multicast tree, so that the fixed nodes and mobile nodes are in a unified way through ί multicast mesh.

附图说明 BRIEF DESCRIPTION

[0046] 图I为一个简单的Bayeux覆盖组播树示意图; [0046] Figure I is a schematic diagram of a simple Bayeux coverage multicast tree;

[0047] 图2为本发明实施例所述IRS的结构示意图; [0047] FIG. 2 is a schematic diagram of the structure of the embodiment of the present invention, IRS;

[0048] 图3为本发明实施例所述IRS保存的信息的格式示意图; [0048] FIG. 3 is a schematic example of format information stored in said IRS embodiment of the present invention;

[0049] 图4为本发明实施例所述身份解析请求报文和身份解析应答报文的格式示意图; [0049] Example 4 is a schematic view showing the format of the identity and identity embodiment parsing resolution reply packet request message to the invention;

[0050] 图5为本发明实施例所述实现组播通信的系统的结构示意图; [0050] FIG. 5 is a schematic diagram of the structure of multicast communication system for implementing embodiments of the present invention;

[0051] 图6为本发明实施例所述实现组播通信的方法的具体流程图; [0051] FIG 6 is a detailed flowchart of a method embodiment of the multicast communication implemented embodiment of the invention;

[0052] 图7为本发明实施例所述组播加入请求报文的格式示意图; [0052] FIG. 7 embodiment a format diagram of the request packet multicast join embodiment of the present invention;

[0053] 图8为本发明实施例所述组播组成员列表中保存的资源记录的格式示意图; [0053] FIG. 8 is a schematic view of the format stored embodiment the multicast group member list of resource records embodiment of the present invention;

[0054] 图9为本发明实施例所述当接收者发生移动后,对组播树进行维护的处理流程图; [0054] FIG. 9 of the present embodiment when the receiver moves, the multicast tree is a process flow diagram maintenance invention;

[0055] 图10为本发明实施例所述地址更新报文的格式示意图; [0055] The embodiment of FIG. 10 is a schematic diagram of the address update packet format of the present invention;

[0056] 图11为本发明实施例所述当组播源发生移动后,对组播树进行维护的处理流程图。 [0056] FIG 11 Example occur after the mobile multicast source, multicast tree maintenance is a process flow diagram of the present invention.

具体实施方式 Detailed ways

[0057] 本发明实施例提供了一种实现组播通信的装置、系统和方法,该方法引入了EID的概念,用EID表示节点的身份标识,用IP地址表示节点的位置标识。 Example embodiments provide an apparatus, a system and method for implementing multicast communication [0057] the present invention, the method introduces the concept of the EID indicating the identity of the node with the EID indicating the position of the node identified by an IP address. 设置IRS来保存、解析和管理节点的EID和IP地址之间的映射关系;组播源根据节点的身份信息来建立组播树。 IRS set up to save the mapping between the EID resolution and management node and IP address; multicast source to establish the identity of the multicast tree according to the information nodes.

[0058] 本发明实施例用EID表示节点的身份标识,每个节点都有全球唯一的EID,用IP地址表示节点的位置标识。 [0058] Example embodiments of the present invention represented by the identity of a node identifier EID, each node has a globally unique EID, indicates the position of the node identified by an IP address. 每个节点的EID保持不变,而节点的IP地址可以动态改变。 EID each node remains unchanged, while the node's IP address can be changed dynamically.

[0059] 本发明实施例提供了一种IRS,IRS用于保存、解析和管理节点的EID和IP地址之间的映射关系,网络中所有的节点都知道IRS的EID和IP地址。 [0059] Example embodiments of the present invention provides an IRS, IRS for storing mapping relationships between the management node and EID parsing and IP address, all of the network node knows the IP address and the IRS EID. IRS的实施例的结构示意图如图2所示,包括如下模块: Structure of the embodiment shown in Figure 2 a schematic view of the IRS, comprises the following modules:

[0060] 映射关系保存模块:用于存储网络中所有节点(包括组播源)的EID和IP地址,以及EID和IP地址之间的映射关系信息,映射关系保存模块可以将上述信息保存在数据库中。 [0060] module stored mapping relationship: means for storing a mapping relationship between all nodes in the network (including a multicast source) IP address and EID, EID and IP address information and the mapping information storing module described above may be stored in a database in. 映射关系保存模块中保存的信息的格式示意图如图3所示,在图3中,资源记录个数字段是指IRS中记录的(EID,IP)对的个数;校验和表明该存储内容的完整性。 Schematic stored mapping relationship stored in the format information module shown in Figure 3, in FIG 3, resource record number field refers to the number recorded in IRS (EID, IP); checksum indicates that the stored content integrity.

[0061] 映射关系解析模块:用于解析节点的EID和IP地址之间的映射关系。 [0061] The mapping relationship analysis module: EID and the mapping relationship between the IP address of the node for parsing. 当节点需要 When a node needs

解析EID时,它向IRS发送携带该EID信息的身份解析请求报文,请求解析该EID ;当IRS接收到该身份解析请求报文后,查找自己保存的映射关系信息,找到和该EID相对应的IP地址,然后给节点返回携带该EID和对应IP地址信息的身份解析应答报文。 When parsing EID, send it to the IRS carries the identity of the EID information resolving request packet, the request to resolve the EID; when the IRS receives the status after resolving request packet to find the mapping relationship information they save, find, and the EID corresponding the IP address, and then return to carry the EID node and the corresponding IP address information of the identity of the resolution reply message. 上述身份解析请求报文和身份解析应答报文的格式示意图如图4所示。 Identity resolution request packet described above and the identity resolution reply message format diagram shown in Fig. 图4中的各个字段的描述如下: The fields in FIG. 4 as follows:

[0062] 标识字段:由客户程序设置并由服务器返回结果,客户程序通过它来确定应答与请求是否匹配。 [0062] identification field: provided by the client program by the server returns a result, the client program to determine whether the response matches the request through it.

[0063] QR字段:表示报文的类型。 [0063] QR field: indicates the type of message. O表示身份解析请求报文,I表示身份解析应答报文。 O represents the identity of resolving request packet, I represent the identity resolution reply message.

[0064] rcode字段:表示对EID的解析是否发生错误。 [0064] rcode field: EID showing an analysis of whether an error occurred. 通常用值O表示没有差错,用值I表示发生差错,发生差错一般情况为:指定需要解析的EID不存在。 O is usually represented by the value of no error, a value I represented by an error occurs, an error occurs generally as: designated to parse EID absent.

[0065] 查询个数字段:表示请求解析的EID的个数。 [0065] Query field number: indicates the number of the request to resolve the EID. 对于身份解析应答报文,该字段的值为O。 For the identity of the resolution reply message, the value of the field O.

[0066] 资源记录个数字段:表示解析到的IP地址个数。 [0066] The number of resource record fields: IP address resolution to the number. 对于身份解析请求报文,该字段的值为O。 For identity resolution request packet, the value of this field is O.

[0067] 查询EID字段:表示请求进行解析的EID值,该字段大小可变。 [0067] Query EID field: represents EID value resolution request, this field size variable. 对于身份解析应答报文,该字段的值为O。 For the identity of the resolution reply message, the value of the field O.

[0068] 应答字段:表示对EID进行解析后所得的IP地址信息,该字段大小可变。 [0068] acknowledgment field: IP address information obtained after the parsing of EID, the field is of variable size. 对于身份解析请求报文,该字段的值为O。 For identity resolution request packet, the value of this field is O.

[0069] 映射关系管理模块:对保存的所有节点(包括组播源)的EID和IP地址,以及EID和IP地址之间的映射关系进行增加、更新和删除等管理操作。 [0069] The mapping relationship management module: a mapping relationship between all nodes stored (including multicast source) and the IP address of EID, EID and IP addresses as well as adding, updating, and deleting management operations. 在节点和组播源发生移动后,向IRS发送携带新的IP地址信息的地址更新报文,IRS接收到该地址更新报文后,对该节点和组播源的IP地址进行更新,实现节点和组播源的EID和IP地址之间的动态映射。 After the source node and the multicast moves, carrying the IRS transmits the new address of the IP address information update message, IRS after receiving the address update message, the source IP address and the multicast node is updated, the node to achieve EID and dynamic mapping between IP address and a multicast source. 所述的映射关系管理模块具体包括:节点地址更新模块和组播源地址更新模块。 The mapping relationship management module comprises: a node address and a multicast source address updating module updating module.

[0070] 其中,节点地址更新模块:用于根据节点发送的携带其最新的IP地址信息的地址更新报文,对所述节点的IP地址信息,以及所述节点的EID和IP地址之间的映射关系信息进行更新; [0070] where the node address updating module: The portable for its new IP address information address of the node sending the update message, the IP address information of the node, and the node between the IP address and EID mapping relationship information is updated;

[0071] 其中,组播源地址更新模块:用于根据组播源发送的携带其最新的IP地址信息的地址更新报文,对所述组播源的IP地址信息,以及所述组播源的EID和IP地址之间的映射关系信息进行更新。 [0071] wherein updating module multicast source address: the address used to carry the IP address of the latest updated information packets according to the multicast source, the multicast IP address of the source, and the multicast source EID mapping relationship between the IP address and update the information.

[0072] 本发明实施例所述实现组播通信的系统的结构示意图如图5所示,包括:组播源、接收者、接入路由器和IRS。 [0072] The structure of the embodiment of the present invention to realize multicast communication system shown in FIG. 5 is a schematic diagram, comprising: a multicast source, receivers, and the access router IRS.

[0073] 组播源:用于管理组播组,使用节点的EID来构建组播树。 [0073] Multicast source: means for managing the multicast group, EID used to construct a multicast tree node. 该组播树中只包含组播源和接收者,是一个简单的端对端关系,不包含中间节点。 The multicast tree contains only multicast sources and receivers, a simple end to end relationship does not comprise an intermediate node. 组播源中保存组播组成员列表,该组播组成员列表中保存各个接收者EID和IP地址之间的映射关系。 Save the multicast source multicast group member list, a list of members of the multicast group to save the mapping between the EID and individual recipients IP addresses. 在发生位置移动后,向IRS发送地址更新报文。 After the position moves, transmits an address update message to the IRS.

[0074] 组播源管理的每个组播组都有自己的身份标识Geid,本发明使用(Seid,Geid)表示一个组播组,其中Seid是组播源的身份标识,Geid是组播组的身份标识。 [0074] each multicast group management multicast source has its own identity GEID, using the present invention (Seid, GEID) represents a multicast group, wherein the identity is Seid multicast source, multicast group GEID identity.

[0075] 接入路由器:接入路由器构成了本发明所述系统的中间层节点,在接入路由器中不需要保存应用层组播树的状态信息,也不需要对应用层组播树进行维护,只是负责数据包的转发。 [0075] The access router: the access router constituting the middle layer node of the system of the invention, the access router does not need to save the state information of the application layer multicast tree does not need to maintain the application layer multicast tree only responsible for forwarding packets. 接入路由器在IP层,使用传统的单播协议OSPF(开放最短路径优先)进行组播数据包的选路和传输,可以保证组播源到接收者之间的信息传输路径是最短路径。 Access router at the IP layer, using a conventional unicast protocol OSPF (Open Shortest Path First) routing and for transmitting the multicast packet, the multicast source to ensure the information transmission path is shortest path between the receivers.

[0076] 接收者:具有IRS的EID和IP地址信息,以及组播源的EID和组播组的EID信息。 [0076] Recipient: the IRS has IP address information and EID, EID and EID and the multicast group information of the multicast source. 向IRS发送身份解析请求报文,通过IRS的解析获得组播源的IP地址信息。 IRS sends a request to resolve the identity of the message, to obtain the IP address information of multicast source by parsing the IRS. 给组播源发送组播加入请求报文,加入相应的组播组,接收组播源发送的组播数据报文。 Transmitting the multicast source to the multicast join request message, adding the corresponding multicast group to receive multicast data packet sent by the multicast source. 在发生位置移动后,向IRS发送地址更新报文。 After the position moves, transmits an address update message to the IRS.

[0077] IRS :用于保存、解析和管理网络中所有节点(包括组播源)的EID和IP地址之间的映射关系。 [0077] IRS: to save the mapping between the EID parsing and managing all network nodes (including the multicast source) and the IP address.

[0078] 本发明实施例所述实现组播通信的方法的具体流程如图6所示,包括如下步骤: [0078] The specific process embodiment of the invention the multicast communication method implemented in FIG. 6, comprising the steps of:

[0079] 步骤61 :当接收者获得组播源的EID (Seid)和组播组的EID (Geid)后,可以确足是否加入该组播组,是否接收该组播组的服务。 [0079] Step 61: When the EID EID (Seid) the recipient gets the multicast source and multicast group (GEID), the foot can determine whether to join the multicast group, whether to receive the multicast service group. 如果确定需要加入该组播组后,则接收者向IRS发送携带Seid信息的身份解析请求报文,请求解析该SEID。 If it is determined that the need to join the multicast group, the receiver sends information to the IRS carrying identity Seid resolution request message, parsing the request SEID.

[0080] 步骤62 :RS接收到上述身份解析请求报文后,查找自己数据库中的保存的EID和IP地址之间的映射关系信息,找到和上述Seid相对应的IP地址,然后,向接收者返回携带查找到的IP地址信息的身份解析应答报文,把Seid和其IP地址之间的对应关系告诉给该接收者。 [0080] Step 62: After receiving the RS Identity resolution request message, to find the mapping relationship between the information stored in its own database EID and IP address, and said Seid find the corresponding IP address, and then, the recipient Allowed to return to find the identity of the IP address information of the resolution reply message, to tell the correspondence between Seid and its IP address to the recipient.

[0081] 步骤63 :接收者将接收到的Seid和其IP地址之间的对应关系进行保存,向组播源发送携带组播源EID和接收者EID的组播加入请求报文,请求加入该组播组。 [0081] Step 63: The recipient correspondence between the received Seid and save its IP address, the transmission carrying the multicast source and the receivers EID EID multicast join request packet to the multicast source, the request to join the multicast group. 上述组播加入请求报文的格式示意图如图7所示。 The above-described format multicast join request packet is a schematic diagram shown in Fig.

[0082] 在图7中,类型字段为1,表示该报文是组播加入请求报文;包长度字段表示组播加入请求报文的总长度,用字节数表示;校验和字段用于检测报文在传输过程中是否遭到破坏。 [0082] In Figure 7, the type field is 1, indicating that the message is a multicast join request packet; packet length field indicates the total length of the multicast join request message, expressed in bytes; checksum field with to detect whether the packet destroyed during transmission.

[0083] 步骤64 :组播源接收到接收者发送过来的上述组播加入请求报文后,记录下接收者的EID(Reid)。 [0083] Step 64: After receiving the multicast source sent from the receiver multicast join request message, the recipient's record EID (Reid). 然后,组播源向IRS发送携带Reid信息的身份解析请求报文,请求解析该Reido Then, the multicast source sends information to the IRS carrying identity Reid resolution request message, parsing the request Reido

[0084] 步骤65 :当IRS接收到上述身份解析请求报文后,查找其数据库中保存的EID和IP地址之间的映射关系信息,找到和上述Reid相对应的IP地址。 [0084] Step 65: When receiving the identity IRS parsing the request and looks up the mapping relation between the information stored in its database and EID IP address, and said Reid find the corresponding IP address. 然后,向组播源返回携带查找到的IP地址信息的身份解析应答报文,把Reid和其对应IP地址之间的映射关系告诉给组播源。 Then, return to find the identity carry IP address information to the multicast source resolution reply message, to tell Reid and their corresponding mapping relationship between the IP address to the multicast source.

[0085] 步骤66 :当组播源接收到IRS发送过来的上述身份解析应答报文后,把接收者的EID和IP地址记录到组播组成员列表中。 [0085] Step 66: When receiving the multicast source IRS identity sent by the resolution reply message, and the recipient's IP address EID record to the multicast group member list. 组播组成员列表中保存的资源记录的格式示意图如图8所示。 Schematic format for saving multicast group member list of resource records as shown in FIG. 在图8中,资源记录个数字段表示组播组成员列表中记录的接收者的(EID,IP)对的个数;校验和字段表明该存储内容的完整性。 In Figure 8, the resource record number field indicates the number of multicast group memberships recorded in the list of recipients (EID, IP); and a checksum field indicates the integrity of the stored content.

[0086] 步骤67 :在进行实际组播通信时,组播源根据组播组成员列表中记录的接收者EID和IP地址,通过路由器给接收者发送组播数据报文。 [0086] Step 67: During the actual multicast communication, the multicast source IP address based on the recipient and EID multicast group member list recorded in the multicast packet transmitted to the recipient through a router. 组播数据报文的报头中应该含有组播组EID字段,使接收者确认该数据报文是组播数据报文,同时也使接收者确认该数据报文属于哪个组播组的组播数据报文。 Header of multicast data packets in the multicast group should contain EID field, so that the receiver confirms the data packet is a multicast packet, but also to the receiver to confirm that the data which multicast data packets belonging to a multicast group message.

[0087] 组播数据报文的发送机制和普通数据报文的发送机制一样,不需要额外的处理。 [0087] The multicast packet sending mechanism and the transmission mechanism as a normal data packet, no additional processing. 网络中的路由器使用OSPF路由协议对该上述数据报文进行选路和转发。 Network routers use the routing protocol OSPF said data packet routing and forwarding.

[0088] 步骤68 :若接收者想离开上述组播组,不再接收上述组播组的组播数据报文,则接收者向IRS发送携带Seid信息的身份解析请求报文,请求解析Seid ;IRS接收到该身份解析请求报文后,查找和Seid相对应的IP地址。 [0088] Step 68: If the receiver wants to leave the multicast group described above, no longer receives the multicast packet of the multicast group described above, the receiver sends information to the IRS carrying identity Seid resolution request message, requesting resolution Seid; IRS receives the identity resolution request packet, and Seid find the corresponding IP address. 然后,给该接收者发送携带查找到的IP地址的身份解析应答报文,把Seid和其对应IP地址之间的影射关系告诉给该接收者。 Then, the receiver sends to carry identification to find the IP address resolution reply message, to tell Seid and its corresponding mapping relationship between the IP address to the recipient.

[0089] 步骤69 :接收者得到组播源的IP地址后,向组播源发送携带组播源EID和接收者EID的组播离开报文。 [0089] Step 69: After the receiver to obtain IP address of the multicast source to the multicast transmission source and receiver EID carrying multicast source to leave a multicast message EID. 组播离开报文的格式示意图如上述图7所示。 Leaving a multicast packet format diagram as shown in FIG. 7. 在图7中,类型字段为2,表示该报文是组播离开报文;包长度字段表示组播离开报文的总长度,用字节数表示;校验和字段用于检测报文在传输过程中是否遭到破坏。 In Figure 7, the type field is 2, indicating that the message is leaving the multicast packet; packet length field indicates the total length of the multicast leave messages, expressed in bytes; checksum field for detecting packets whether the destruction of the transmission process.

[0090] 步骤610 :当组播源接收到组播离开报文后,获取其中携带的接收者EID信息,把组播组成员列表中相应的接收者EID及其IP地址删除,并且不再给该该接收者发送组播数据报文。 [0090] Step 610: After receiving a multicast source to leave a multicast packet, the receiver acquires information carried in EID, delete the multicast group member list and the corresponding EID recipient IP address, and not to the receiver sends the multicast data packet.

[0091] 当接收者发生移动后,需要对上述组播树中的组播树进行相应的维护,具体维护过程的处理流程如图9所示,包括如下步骤: [0091] When the receiver moves, the corresponding need for maintenance of the above multicast tree in the multicast tree, the specific maintenance processing flow shown in Figure 9, comprising the steps of:

[0092] 步骤91、接收者向IRS和组播源发送携带自己的新IP地址的地址更新报文,把自己的新地址告诉给IRS和组播源。 [0092] Step 91, the recipient is sent to the IRS and the multicast source address carried in their new IP address update packet to tell his new address to the IRS and the multicast source. 上述地址更新报文的格式如图10所示。 Said address update packet format as shown in FIG. 其中,包长度字段表示地址更新报文的总长度,用字节数表示;校验和字段用于检测报文在传输过程中是否遭到破坏。 Wherein the address update packet length field indicates the total length of the message, expressed in bytes; checksum field used to detect whether the damaged packet during transmission.

[0093] 步骤92、IRS接收到上述地址更新报文后,更新其数据库中保存的接收者IP地址信息,用接收者新的IP地址代替接收者原来的IP地址,实现数据库中接收者EID和IP地址之间的动态映射。 [0093] Step 92, after receiving the IRS address update messages, update its database of IP address information stored in the receiver, the receiver instead of the original IP address with the new IP address of the recipient, the recipient database implemented and EID dynamic mapping between IP addresses.

[0094] 组播源接收到上述地址更新报文后,更新自己保存的组播组成员列表,用接收者新的IP地址代替接收者原来的IP地址,实现组播组成员列表中接收者EID和IP地址之间的动态映射。 [0094] After receiving the above-described multicast source address update messages to update their own list of multicast group members stored, instead of the original recipient of the IP address with the new IP address of the receiver, multicast group member list, the recipient EID and dynamic mapping between IP addresses.

[0095] 步骤93、组播源使用接收者新的IP地址给接收者发送组播数据报文。 [0095] Step 93, the source is multicasting data packets to the recipient using the new IP address of the recipient.

[0096] 当组播源发生移动后,需要对上述组播树中的组播树进行相应的维护,具体维护过程的处理流程如图11所示,包括如下步骤: [0096] When the mobile multicast source occurs, the corresponding need for maintenance of the above multicast tree multicast tree, the specific processing flow of the maintenance process shown in Figure 11, comprising the steps of:

[0097] 步骤111、组播源向IRS发送携带自己的新IP地址的上述地址更新报文,把自己的新地址告诉给IRS。 [0097] Step 111, the above-mentioned address of the multicast source to send to the IRS to bring their own new IP address update packet to tell his new address to the IRS.

[0098] 步骤112,IRS接收到上述地址更新报文后,更新其数据库中保存的组播源IP地址信息,用组播源新的IP地址代替组播源原来的IP地址,实现数据库中组播源EID和IP地址之间的动态映射。 [0098] Step 112, IRS after receiving said address update packet for updating the multicast source IP address information stored in its database, instead of the original source of the multicast IP address with the new IP address of the multicast source group implemented database dynamic mapping between IP address and multicast source EID.

[0099] 步骤113,组播源使用其新的IP地址给组播组成员发送组播数据报文。 [0099] Step 113, the multicast source to the multicast group member sends a multicast data packet using its new IP address.

[0100] 以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到的变化或替换,都应涵盖在本发明的保护范围之内。 [0100] The above are only the preferred specific embodiments of the invention, but the scope of the present invention is not limited thereto, any skilled in the art in the art within the scope of the invention disclosed can be easily thought variations or replacements shall fall within the protection scope of the present invention. 因此,本发明的保护范围应该以权利要求的保护范围为准。 Accordingly, the scope of the present invention should be defined by the scope of the claims.

Claims (8)

1. 一种实现组播通信的系统,其特征在于,包括: 组播源:用于获取并保存所有节点的EID和IP地址之间的映射关系信息;根据所有节点的EID信息来构建和管理组播树,根据该组播树和节点的IP地址信息通过接入路由器的中转和接收者之间进行组播通信,所述组播树中包含组播源和接收者,不包含中间节点;接入路由器:使用开放最短路径优先OSPF协议在组播源和接收者之间进行组播数据报文的传递; 接收者:给组播源发送组播加入请求报文,加入相应的组播组;通过接入路由器的中转和组播源之间进行组播通信; 身份解析服务器:用于保存、解析和管理网络中所有节点和组播源的EID和IP地址,以及EID和IP地址之间的映射关系信息。 1. A system for implementing multicast communication, characterized by comprising: a multicast source: means for acquiring and storing a mapping relationship between all nodes and the IP address of the EID; building and managing information for all nodes in accordance with EID multicast tree, according to the IP address of the multicast tree and node information by multicast communication between the access router and the transfer recipient, comprising the multicast tree multicast source and receiver does not include an intermediate node; access router: using open shortest path First OSPF protocol for transmitting multicast packets between the multicast source and the receiver; the receiver: transmission source multicast join to a multicast request message, adding the corresponding multicast group ; identity resolution server; multicast communication carried out by the transit between the access router and the multicast source: between for saving, and parsing and EID management network IP addresses of all the nodes and the multicast source, and the IP address and EID mapping relationship information.
2. 一种实现组播通信的方法,其特征在于,设置身份解析服务器,通过该身份解析服务器来保存、解析和管理网络中所有节点和组播源的EID和IP地址,以及EID和IP地址之间的映射关系信息,所述的方法具体包括: 组播源获取并保存所有节点的EID和IP地址之间的映射关系信息;根据所有节点的EID信息来构建和管理组播树,所述组播树中包含组播源和接收者,不包含中间节点; 所述组播源根据所述组播树和节点的IP地址信息通过接入路由器的中转和接收者之间进行组播通信。 A method of multicast communication, wherein disposed resolution server identity, the identity preserved by resolution server, and a multicast source EID all nodes of the network management and parsing and IP addresses, and IP addresses and EID mapping relationship between the information, the method comprises: acquiring the multicast source and stores a mapping relationship between all nodes and the IP address of the EID; constructed according to the EID and the management information for all nodes in the multicast tree, the comprising the multicast tree multicast source and receiver, it does not include the intermediate node; the multicast source via multicast communication between the receiver and the access router IP address according to relay the multicast tree and node information.
3.根据权利要求2所述的实现组播通信的方法,其特征在于,所述方法具体包括: 用全球唯一的EID表示节点的身份标识,用IP地址表示节点的位置标识,每个节点的EID保持不变,在节点发生移动时其IP地址动态改变。 The multicast communication method according to claim 2, characterized in that the method comprises: the identity of the node represented by the EID globally unique, location identifier represents the IP address of the node, each node EID remains unchanged, dynamically change its IP address when the mobile node occurs.
4.根据权利要求2所述的实现组播通信的方法,其特征在于,所述方法具体包括: 所述接入路由器使用OSPF协议在组播源和接收者之间进行组播数据报文的中转。 The multicast communication method according to claim 2, characterized in that the method comprises: the access router using the OSPF protocol between the multicast source and the receivers of the multicast data packets transit.
5.根据权利要求3或4所述的实现组播通信的方法,其特征在于,所述方法具体包括: 接收者向身份解析服务器发送携带组播源EID信息的身份解析请求报文,所述身份解析服务器根据所述组播源EID信息,查找其保存的EID和IP地址之间的映射关系信息,找到和所述组播源EID信息相对应的IP地址,向接收者返回携带查找到的IP地址信息的身份解析应答报文。 The multicast communication method of claim 3 or claim 4, characterized in that the method comprises: carrying the receiver sends multicast source EID identity information to the identity resolution request packet analysis server, the identity resolution server according to the multicast source EID information, find the mapping relationship information between its stored EID and IP address, and find the multicast source EID information corresponding IP address is returned to the recipient carries found IP address information of the identity resolution reply message.
6.根据权利要求5所述的实现组播通信的方法,其特征在于,所述方法具体包括: 接收者根据获得的组播源的IP地址信息,向组播源发送携带组播源EID和接收者EID的组播加入请求报文,组播源接收到该组播加入请求报文后,向身份解析服务器发送携带所述接收者EID信息的身份解析请求报文; 所述身份解析服务器接收到所述身份解析请求报文后,找到和所述接收者EID相对应的IP地址,向组播源返回携带查找到的IP地址信息的身份解析应答报文; 所述组播源将接收到的所述接收者的EID和IP地址之间的映射关系进行保存,根据所述组播树和所述接收者的IP地址,通过接入路由器的中转和所述接收者之间进行组播数据报文的通信。 The multicast communication method as claimed in claim 5, wherein said method comprises: a receiver according to the IP address information obtained multicast source, multicast transmission carrying the multicast source and the source EID EID receiver multicast join request message, receiving the multicast source after the multicast join request message, the message carrying the identity information to the identity of the recipient EID resolution servers resolving request packet; receiving the identity resolution server identity to the resolution request packet, and the recipient to find the IP address corresponding EID, return to find the identity of carrying information of the IP address resolution reply message to the multicast source; received the multicast source EID mapping relationship between the IP address and the recipient to save, according to the IP address of the multicast tree and the recipient, multicast data transfer between the access router and the recipient communication message.
7.根据权利要求2所述的实现组播通信的方法,其特征在于,所述方法具体包括: 当所述接收者需要离开组播组时,所述接收者向所述组播源发送携带组播源EID和接收者EID的组播离开报文;所述组播源接收到所述组播离开报文后,将其保存的所述接收者EID及其IP地址删除,并且不再给所述接收者发送组播数据报文。 The multicast communication method according to claim 2, characterized in that the method comprises: when the recipient to leave a multicast group, the recipient can transmit a multicast source to the EID EID multicast sources and multicast receivers leave message; after receiving the multicast source to leave a multicast packet, it deletes the stored EID and the IP address of the recipient, and will not give the receiver sends multicast packets.
8.根据权利要求2所述的实现组播通信的方法,其特征在于,所述方法还包括: 当所述组播源或接收者在发生位置移动后,向身份解析服务器发送携带其最新的IP地址的地址更新报文,身份解析服务器接收到所述地址更新报文后,将所述组播源或接收者的IP地址进行更新。 The multicast communication method according to claim 2, characterized in that, said method further comprising: when the multicast source or receiver position after moved, the message carrying the identity of its new resolution server address IP address update message, the identity resolution server, after receiving the address update message, the IP address of the multicast source to the receivers to be updated.
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