WO2011032451A1 - 一种实现组播业务的方法、系统及边缘路由器 - Google Patents

一种实现组播业务的方法、系统及边缘路由器 Download PDF

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Publication number
WO2011032451A1
WO2011032451A1 PCT/CN2010/076211 CN2010076211W WO2011032451A1 WO 2011032451 A1 WO2011032451 A1 WO 2011032451A1 CN 2010076211 W CN2010076211 W CN 2010076211W WO 2011032451 A1 WO2011032451 A1 WO 2011032451A1
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WIPO (PCT)
Prior art keywords
multicast
asr
gaid
grid
multicast service
Prior art date
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PCT/CN2010/076211
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English (en)
French (fr)
Inventor
姚春波
黄兵
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 JP2012529104A priority Critical patent/JP2013504958A/ja
Priority to US13/395,685 priority patent/US8913614B2/en
Priority to EP10816655.4A priority patent/EP2466924B1/en
Publication of WO2011032451A1 publication Critical patent/WO2011032451A1/zh

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Classifications

    • 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]
    • 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
    • H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/16—Multipoint routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/10—Mapping addresses of different types
    • H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2521—Translation architectures other than single NAT servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5084—Providing for device mobility

Definitions

  • the present invention relates to the field of network interconnection technologies, and in particular, to a method, a system, and an edge router for implementing a multicast service. Background technique
  • the IP address of Transmission Control Protocol/Internet Protocol (TCP/IP) widely used in the Internet has a dual function, and is used as a location identifier of a network interface of a network layer communication terminal in a network topology. And as an identity.
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • IP address of the terminal changes, not only the route changes, but also the identity of the terminal changes. This causes the routing load to become heavier and heavy, and the change of identity will cause the application and connection to be interrupted.
  • IP addresses In order to solve the problem of semantic overload and severe routing load of IP addresses, an idea of separating identity and location identifiers is proposed, and the dual functions of IP addresses are separated to provide dynamics, multiple townships, and IP address dynamics. Redistribution, mitigation of routing load and support for mutual visits between different network areas in the next generation of the Internet.
  • FIG 1 shows a Location Identification Separation Network (LISN) that separates the location identifier from the identity.
  • the LISN retains the advantages of the IP network.
  • the edge router is the Access Service Router (ASR) and the terminal.
  • ASR Access Service Router
  • the point-to-point connection is used.
  • the terminals in the same ASR are isolated from each other and can only communicate with each other through ASR.
  • the user accesses the ASR through identity authentication.
  • the ASR performs source address verification on the uplink packets of the terminal.
  • the LISN implements the separation of the identity and location identifiers of the terminal by the following mechanism.
  • the IP address of the ASR where the terminal is located is used as the location identifier of the terminal, which is called the router ID.
  • RID uses 128-bit encoding in the IPv6 protocol, and 32-bit encoding in the IPv4 protocol.
  • the identity of the terminal is introduced, called the Access ID (AID), and the AID uses 128-bit encoding.
  • AID Access ID
  • the terminal only perceives its own AID and the AID of the communicating peer, but does not perceive the RID information. All upper-layer connections are established based on AID, which uses TCP/AID and User Datagram Protocol (UDP)/AID instead of TCP/IP and UDP/IP in the live network.
  • UDP User Datagram Protocol
  • a mapping server is also introduced in the LISN for storing the AID-RID mapping information of the terminal.
  • the terminal moves, only the AID-RID mapping information needs to be updated, and the AID does not have to be changed, so that the movement of the terminal does not affect the connection of the service.
  • Multicast is a network communication method in which a single sender corresponds to multiple receivers. By transmitting a single information stream to multiple receivers, the multicast technology can reduce the communication traffic of multiple networks when multiple receivers simultaneously acquire or view the same resources.
  • LISN is a brand new network architecture. There is no way to implement multicast services in LISN in the prior art. Summary of the invention
  • the technical problem to be solved by the present invention is to provide a method and system for implementing a multicast service
  • the multicast service is implemented.
  • a method for implementing a multicast service includes: a multicast source sends a multicast service packet, and sets a destination address of the multicast service packet to be a multicast connection allocated by the multicast source. Enter the identifier GAID;
  • the edge router ASR of the multicast source After receiving the multicast service packet, the edge router ASR of the multicast source searches for the corresponding GRID from the established GAID-multicast route identifier GRID mapping table according to the GAID, and sends the multicast service packet to the discovered GRID.
  • the core router GSR searches for the corresponding multicast tree according to the GRID of the multicast service packet, and delivers the multicast service packet to the ASR in the service area according to the multicast tree;
  • the ASR in the service area searches for the corresponding GAID from the established GAID-GRID mapping table according to the GRID, and sends the multicast service packet to the ASR terminal in the service area by using the found GAID.
  • the multicast source Before sending the multicast service packet, the multicast source applies for GAID and GRID. After obtaining the GRID, it requests authentication from the identity location register ILR.
  • the ILR sends the GAID and GRID of the multicast source to the service area. ASR;
  • the ASR in the service area After receiving the GAID and GRID, the ASR in the service area establishes a GAID-GRID mapping table.
  • the ASR in the service area After receiving the GAID and the GRID, the ASR in the service area also broadcasts the GAID to the terminal in the AS in the service area;
  • the terminal in the ASR in the service area determines whether to receive the multicast service identified by the GAID according to the received GAID, and if received, requests the ASR to which the multicast service belongs.
  • the ASR in the service area requests the GSR of the upper layer to join the service group of the multicast service identified by the GAID according to the request of the terminal;
  • the GS adds a route to the requesting ASR in the multicast tree according to the ASR request.
  • the binding relationship between the GAID and the GRID assigned to the multicast source and the AID of the multicast source is configured in the ILR.
  • the steps to authenticate include:
  • the multicast source sends a multicast control packet to the ASR to which it belongs, and the ASR sends the GAID and/or AID of the multicast source to the ILR;
  • the ILR queries the binding relationship based on the received GAID and/or AID. If the GRID of the multicast source is obtained, the authentication succeeds.
  • the method of sending the multicast service packet to the core router by using the found GRID includes: The ASR to which the multicast source belongs replaces the GAID of the multicast service packet with the found GRID, and sends the replaced multicast service packet to the core. Router
  • the step of sending the multicast service packet to the ASR terminal in the service area by using the found GAID includes: The ASR in the service area replaces the GRID of the multicast service packet with the found GAID, and the The multicast service packet is sent to the ASR terminal in the service area.
  • the method of sending the multicast service packet to the core router by using the discovered GRID includes: the ASR to which the multicast source belongs encapsulates the found GRID into the multicast service packet, and sends the re-encapsulated multicast service packet to the core.
  • the multicast service packet is delivered to the ASR in the service area by using the found GAID.
  • the steps of the ASR include: replacing the GRID with the found GAID, and removing the original GAID encapsulated in the multicast service packet, and sending the original GAID to the ASR terminal in the service area.
  • the terminal determines, according to the GAID of the received multicast service packet, whether the multicast service packet belongs to the requested multicast service, and if so, decapsulates the multicast service packet to obtain service data; otherwise, discarding the multicast service package.
  • the step of sending the multicast service packet to the core router by using the found GRID further includes:
  • the source address of the multicast service packet is also set to its own AID
  • the step of sending the multicast service packet to the AS terminal in the service area further includes: when the ASR in the service area replaces the GRID of the multicast service packet with the found GAID, The RID of the multicast service packet is replaced with the AID found from the established AID-RID mapping table.
  • the step of sending the multicast service packet to the core router by using the found GRID further includes: when the multicast source sends the multicast service packet, setting the source address of the multicast service packet to its own AID. ; as well as
  • the ASR to which the multicast source belongs When the ASR to which the multicast source belongs encapsulates the discovered GRID into the multicast service packet, it also encapsulates the RID found in the saved AID-RID mapping table into the multicast service packet.
  • the step of sending the multicast service packet to the ASR terminal in the service area by using the found GAID further includes: replacing, by the ASR in the service area, the GRID with the found GAID, and removing the multicast When the original GAID is encapsulated in the service package, the encapsulated RID is also removed.
  • a system for implementing a multicast service including a multicast source, an ASR to which the multicast source belongs, a core router, and an ASR in the service area, where:
  • the multicast source is set to: send a multicast service packet, and set the destination address of the multicast service packet to its assigned multicast access identifier GAID;
  • the ASR to which the multicast source belongs is set to: After receiving the multicast service packet, it is built according to the GAID. Find the corresponding GRID in the GAID-Multicast Route Identification GRID mapping table, and use the found GRID to send the multicast service packet to the core router.
  • the core router is configured to: search for a corresponding multicast tree according to the GRID of the multicast service packet, and send a multicast service packet to the ASR in the service area according to the multicast tree;
  • the ASR in the service area is set to: Find the corresponding GAID from the established GAID-GRID mapping table according to the GRID, and use the found GAID to deliver the multicast service packet to the ASR terminal in the service area.
  • the system also includes an ILR, wherein
  • the multicast source is also configured to: apply for GAID and GRID before sending the multicast service packet, and request authentication from the ILR after obtaining the GRID;
  • the ILR is configured to: authenticate the multicast source according to the request of the multicast source, and if the authentication succeeds, send the GAID and GRID of the multicast source to the ASR in the service area;
  • the ASR in the service area is also set to: After receiving the GAID and GRID, establish a GAID-GRID mapping table.
  • the ASR to which the multicast source belongs is set to: Use the discovered GRID to send the multicast service packet to the core router as follows: Replace the GAID of the multicast service packet with the found GRID, and replace the multicast service. The packet is sent to the core router;
  • the ASR in the service area is set to: Use the found GAID as follows to deliver the multicast service packet to the ASR terminal in the service area: Replace the GRID of the multicast service packet with the found GAID.
  • the multicast service packet is delivered to the ASR terminal in the service area.
  • the ASR to which the multicast source belongs is also set to: Use the discovered GRID to send the multicast service packet to the core router as follows: Encapsulate the discovered GRID into the multicast service packet, and repackage the multicast. The service packet is sent to the core router;
  • the ASR in the service area is also set as follows:
  • the multicast service packet is sent to the ASR terminal in the service area by using the found GAID as follows: Replace the GRID with the found GAID, and remove the multicast service.
  • the original GAID encapsulated in the packet is sent to the ASR lower terminal in the service area.
  • the present application also discloses an edge router (ASR), where the ASR is an AS to which the multicast source belongs, or the ASR is an ASR in the service area.
  • ASR edge router
  • the ASR to which the multicast source belongs is set to: after receiving the multicast service packet, searching for the corresponding GRID from the established GAID-Multicast Routing Identifier (GRID) mapping table according to the multicast access identifier (GAID).
  • the multicast service packet is sent to the core router by using the found GRID, so that the core router searches for the corresponding multicast tree according to the GRID of the multicast service packet, and according to the multicast tree to the service area.
  • the ASR delivers the multicast service packet.
  • the multicast service packet is sent by the multicast source to the ASR to which the multicast source belongs.
  • the destination address of the multicast service packet is set to the assigned GAID.
  • the method is configured to: find the corresponding GAID from the established GAID-GRID mapping table according to the GRID, and send the multicast service packet to the ASR lower terminal in the service area by using the found GAID.
  • the ASR in the service area is further configured to: After receiving the GAID and the GRID, establish a GAID-GRID mapping table.
  • the ASR to which the multicast source belongs is set to: use the found GRID to send the multicast service packet to the core router as follows: Replace the GAID of the multicast service packet with the found GRID, Send the replaced multicast service packet to the core router;
  • the ASR in the service area is configured to: deliver the multicast service packet to the ASR terminal in the service area by using the found GAID as follows: Replace the GRID of the multicast service packet The multicast service packet is delivered to the ASR lower terminal in the service area.
  • the ASR to which the multicast source belongs is further configured to: send the multicast service packet to the core router by using the found GRID as follows: Encapsulating the found GRID into the multicast service packet, The encapsulated multicast service packet is sent to the core router;
  • the ASR in the service area is further configured to: use the found GAID to send the multicast service packet to the ASR terminal in the service area: replace the GRID with the found The GAID, and the original GAID encapsulated in the multicast service packet is removed and sent to the ASR lower terminal in the service area.
  • the present invention identifies a multicast service packet between the ASR and the terminal by using the GAID, and identifies the multicast service packet in the core network by using the GRID, thereby implementing multicast in the network where the location identifier and the identity identifier are separated from the LISN. Service, the present invention does not need to change the terminal and is compatible with existing IPv4 networks and IPv6 networks.
  • FIG. 1 is an architectural diagram of a LISN network in the prior art
  • FIG. 2 is a flowchart of a method for implementing a multicast service according to the present invention
  • FIG. 3 is a structural diagram of a system for implementing a multicast service according to the present invention. Preferred embodiment of the invention
  • the present invention defines two types of multicast addresses, a multicast AID (Group AID, GAID) and a multicast RID (Group, GRID), wherein the GAID is used to identify a multicast stream between the terminal and the ASR, and the scope of the action is equivalent to AID, with 128-bit encoding.
  • the GRID is used to identify the multicast stream in the core network, and its scope is equivalent to RID.
  • 128-bit encoding is used in the IPv6 protocol, and is adopted in the IPv4 protocol.
  • the GRID can take an unused address in the IPv4 or IPv6 multicast address space.
  • the GAID can take an unused address in the IPv6 multicast address space. To simplify the design, GRID and GAID can be taken as the same address in the same space.
  • FIG. 2 is a method for implementing a multicast service according to the present invention, including:
  • the user of the multicast source applies for the GAID and the GRID to the address server in the management organization or the network;
  • the management organization or the address server allocates a GAID and a GRID to the multicast source, and sends the GAID to the multicast source.
  • the GAID and GRID assigned by the management organization or address server to the multicast source need to be in the LISN network. The only one.
  • the reason why only the GAID is sent to the multicast source is because the GRID is used to identify the multicast stream in the core network. If the multicast source is sent to the multicast source, the multicast source can understand the transmission information of the core network, which will cause network security. risk.
  • the management organization binds the GAID and the GRID allocated to the multicast source to the AID of the multicast source in an Identity Location Register (IRR).
  • IRR Identity Location Register
  • the multicast source sends a multicast control packet to the ASR to which the multicast source belongs, and requires authentication.
  • the ASR to which the multicast source belongs After receiving the multicast control packet, the ASR to which the multicast source belongs sends the GAID and/or AID of the multicast source to the ILR through the core router of the upper layer;
  • the ILR queries the binding relationship according to the received GAID and/or the AID. If the GRID of the multicast source is obtained, the authentication is successful, and the GAID and the GRID of the multicast source are sent to the ASR in the service area.
  • the ASR in the service area After receiving the GAID and the GRID of the multicast source, the ASR in the service area establishes a mapping table (GAID-GRID mapping table) of the GAID and the GAID, and establishes a mapping table (AID-RID mapping table) of the RID and the AID.
  • the ASR to which the multicast source belongs is notified that the multicast source is successfully authenticated.
  • the ASR in the service area broadcasts the GAID to the terminal in the management area;
  • the terminal determines, according to the received GAID, whether to receive the multicast service, and if received, sends a notification message to the ASR to which the terminal belongs, requesting to open the multicast service;
  • the multicast service represented by different GAIDs needs to be advertised.
  • the user can obtain the multicast service represented by the received GAID by querying to determine whether to receive the multicast service.
  • ASR periodically broadcasts GAIDs to terminals under it using the Internet Group Management Protocol (IGMP).
  • IGMP Internet Group Management Protocol
  • ASR needs to support Layer 2 multicast protocols, such as IGMP Proxy and IGMP Snooping.
  • the ASR After receiving the notification message of the terminal, the ASR sends a notification message to the core router of the upper layer to request to join the multicast service group.
  • the core router adds a route to the ASR that sends the notification message in the multicast tree.
  • the AS After the GAID is sent, the AS requests the core of the upper layer if it does not receive the notification message from the terminal.
  • the heart router deletes its route in the multicast tree.
  • the multicast source sends a multicast service packet, the destination address is a GAID assigned to it, and the source address is its own AID, and the format is GAID: AID: DATA;
  • the ASR replaces the GAID of the multicast service packet with the GRID and replaces the AID with the RID according to the locally stored GAID-GRID mapping table and the AID-RID mapping table.
  • the format is: GRID: RID: DATA, and the multicast service packet is sent to the core network;
  • the core router in the network searches for a corresponding multicast tree according to the GRID of the multicast service packet, and sends a multicast service packet to the ASR in the service area according to the multicast tree.
  • the LISN uses the Protocol Independent Multicast (PIM) protocol as the multicast routing protocol.
  • PIM Protocol Independent Multicast
  • ASR and GSR are responsible for establishing and maintaining the PIM routing.
  • the ASR that receives the multicast service packet replaces the GRID with the GAID according to the locally stored GRID-GAID mapping table and the AID-RID mapping table, and replaces the RID with the AID in the format of GAID: AID: DATA, and sends it to the next Terminal
  • the RID of the multicast source is carried in the multicast service packet to find the actual sender of the multicast service packet in the multi-source multicast service.
  • the terminal determines, according to the received GAID of the multicast service packet, whether the multicast service packet belongs to the requested multicast service, and if yes, decapsulates the service data; otherwise, discards the multicast service packet.
  • the steps 212 to 214 are used to forward the multicast service packet by using the address replacement method, and the multicast service packet may be forwarded by using the secondary encapsulation method, including the following steps:
  • the multicast source sends the multicast service packet.
  • the destination address is the GAID assigned to it.
  • the source address is its own AID.
  • the format is GAID: AID: DATA;
  • the ASR is stored locally.
  • the GAID-GRID mapping table and the AID-RID mapping table are used to find the GRID corresponding to the GAID and the RID corresponding to the AID, and form an IPinIP packet.
  • the format is: GRID: RID: GAID: AID: DATA, and the multicast service packet is sent to the network. in; c: The core router in the network searches for the corresponding multicast tree according to the GRID of the multicast service packet, and delivers the multicast service packet to the ASR in the service area according to the multicast tree;
  • the ASR that receives the multicast service packet replaces the GRID with the found GAID according to the locally stored GRID-GAID mapping table, and removes the RID and the original GAID.
  • the format of the multicast service packet becomes GAID: AID: DATA, Send the multicast service packet to the terminal under it.
  • FIG. 3 is a system for implementing a multicast service according to the present invention, including: a multicast source, an ASR to which the multicast source belongs, a core router, and an ASR and an ILR in the service area, where:
  • the multicast source is used to apply for GAID and GRID before sending the multicast service packet. After obtaining the GRID, it requests authentication to the ILR. It is also used to send the multicast service packet, and set the destination address of the multicast service packet. Become the assigned multicast access identifier GAID;
  • the ASR to which the multicast source belongs is used to search for the corresponding GRID from the established GAID-multicast routing identifier GRID mapping table based on the GAID, and use the discovered GRID to forward the multicast service packet.
  • the router or the encapsulated GRID is encapsulated into a multicast service packet, and the re-encapsulated multicast service packet is sent to the core router;
  • the core router is configured to search for a corresponding multicast tree according to the GRID of the multicast service packet, and send a multicast service packet to the ASR in the service area according to the multicast tree.
  • the ASR in the service area is also used to establish a GAID-GRID mapping table after receiving the GAID and the GRID, and is also used to find the corresponding GAID from the established GAID-GRID mapping table according to the GRID, and use the found GAID.
  • the process of sending the multicast service packet to the lower terminal and using the found GAID to deliver the multicast service packet to the lower terminal includes: replacing the GRID of the multicast service packet with the found GAID, and replacing the The multicast service packet is sent to the lower terminal; or the GRID is replaced with the found GAID, and the original GAID encapsulated in the multicast service packet is removed and sent to the terminal.
  • the IL is configured to authenticate the multicast source according to the request of the multicast source. If the authentication succeeds, the GAID and the GRID of the multicast source are sent to the ASR in the service area.
  • the present invention identifies a multicast service packet between the ASR and the terminal by using the GAID, and identifies the multicast service packet in the core network by using the GRID, thereby implementing the multicast service in the network where the location identifier and the identity identifier are separated, such as the LISN. Change terminals and be compatible with existing IPv4 networks and IPv6 networks.

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Abstract

本发明公开了一种实现组播业务的方法， 包括： 组播源发送组播业务包，将该组播业务包的目的地址设置成为其分配的组播接入标识 （GAID）；组 播源所属的边缘路由器（ASR）根据GAID从所建立的GAID-组播路由标识（GRID）映射表中查找对应的GRID，将组播业务包发送到核心路由器；核心路由器GSR根据组播业务包的GRID查找对应的组播树， 向业务区域内的ASR下发组播业务包；业务区域内的ASR根据GRID从所建立的GAID-GRID映射表中查找对应的GAID，将组播业务包下发给其下终端。本发明还公开了相应系统和ASR。本发明在位置标识与身份标识分离的网络中实现组播。

Description

一种实现组播业务的方法、 系统及边缘路由器
技术领域
本发明涉及网络互联技术领域， 尤其涉及一种实现组播业务的方法、 系 统及边缘路由器。 背景技术
目前， 在因特网中广泛使用的传输控制协议 /网际协议 （ Transmission Control Protocol/Internet Protocol, TCP/IP ) 的 IP地址具有双重功能， 既作为 网络层通信终端的网络接口在网络拓朴中的位置标识， 又作为身份标识。 TCP/IP设计之初并未考虑终端移动的情况， 但是， 当终端移动逐渐普遍时， 现有 IP地址的语义过载缺陷就变得日益明显。 当终端的 IP地址发生变化时， 不仅路由要发生变化， 终端的身份标识也发生了变化， 这就会导致路由负载 越来越重， 而且身份标识的变化会导致应用和连接的中断。
为解决 IP地址的语义过载和路由负载严重的问题，人们提出了一种分离 身份标识和位置标识的思想， 将 IP地址的双重功能进行分离， 以提供对移动 性、 多家乡性、 IP地址动态重分配、 减轻路由负载以及下一代互联网中不同 网络区域之间的互访的支持。
图 1 是一种将位置标识与身份标识分离的网络（Location Identification Separation Network, LISN ) ， LISN保留了 IP网络的优势， 如， 边缘路由器 即接入服务路由器 （ Access Service Router , ASR ) 与终端之间采用点到点连 接； 同一个 ASR下的终端相互隔离， 只能通过 ASR互通； 用户接入 ASR需 经过身份认证； ASR对终端上行的数据包进行源地址验证等。
LISN通过下面的机制实现终端的身份标识与位置标识的分离。
以终端所在的 ASR 的 IP地址作为终端的位置标识， 称为路由器标识
( Router ID, RID ) , RID在 IPv6协议中采用 128位编码， 在 IPv4协议中采 用 32位编码。 引入终端的身份标识， 称为接入标识 （Access ID, AID), AID 采用 128位编码。 LISN中， 终端只感知自身的 AID, 以及通信对端的 AID, 而不感知 RID 信息。 所有的上层连接均基于 AID建立， 即采用 TCP/AID和用户数据报协议 ( User Datagram Protocol, UDP ) /AID代替现网中的 TCP/IP和 UDP/IP。
在 LISN中还引入映射服务器， 用于存放终端的 AID-RID映射信息， 终 端移动时， 只需要更新其 AID-RID映射信息， 而不必改变 AID， 这样终端的 移动就不会影响业务的连接。
组播是一种单个发送者对应多个接收者的网络通信方法， 组播技术通过 向多个接收方传送单信息流， 可以减少多个接收方同时获取或查看相同资源 时网络的通信流量。 LISN是一种全新的网络架构，现有技术中尚没有在 LISN 中实现组播业务的方法。 发明内容
本发明要解决的技术问题是提供一种实现组播业务的方法及系统， 在
LISN等位置标识与身份标识分离的网络中， 实现组播业务。
为解决上述技术问题， 本发明的一种实现组播业务的方法， 包括： 组播源发送组播业务包， 将该组播业务包的目的地址设置成为所述组播 源分配的组播接入标识 GAID;
组播源所属的边缘路由器 ASR接收到组播业务包后，根据 GAID从所建 立的 GAID-组播路由标识 GRID映射表中查找对应的 GRID， 采用查找到的 GRID, 将组播业务包发送到核心路由器；
核心路由器 GSR根据组播业务包的 GRID查找对应的组播树， 根据组播 树向业务区域内的 ASR下发组播业务包； 以及
业务区域内的 ASR根据 GRID从所建立的 GAID-GRID映射表中查找对 应的 GAID, 采用查找到的 GAID, 将组播业务包下发给所述业务区域内的 ASR下终端。
组播源在发送组播业务包之前， 申请 GAID和 GRID, 在得到 GRID后， 向身份位置寄存器 ILR请求进行鉴权；
若鉴权成功， 则 ILR将组播源的 GAID和 GRID发送给业务区域内的 ASR; 以及
业务区域内的 ASR在接收到 GAID和 GRID后 , 建立 GAID-GRID映射 表。
业务区域内的 ASR在接收到 GAID和 GRID后， 还向所述业务区域内的 AS 下的终端广播 GAID；
业务区域内的 ASR下的终端根据接收到的 GAID决定是否接收该 GAID 标识的组播业务， 若接收， 则向自身所属的 ASR请求开通该组播业务；
业务区域内的 ASR根据所述终端的请求，向上层的 GSR请求加入 GAID 标识的组播业务的业务群； 以及
GS 根据 ASR的请求在组播树中， 添加到达发出请求的 ASR的路由。 在 ILR中配置有为组播源分配的 GAID和 GRID与组播源的 AID的绑定 关系；
鉴权的步骤包括：
组播源向其所属的 ASR发送组播控制包， 该 ASR将组播源的 GAID和 / 或 AID发送给 ILR; 以及
ILR根据接收到的 GAID 和 /或 AID 查询绑定关系， 若得到组播源的 GRID, 则鉴权成功。
采用查找到的 GRID, 将组播业务包发送到核心路由器的步骤包括： 组 播源所属的 ASR将组播业务包的 GAID替换为查找到的 GRID, 将替换后的 组播业务包发送到核心路由器；
釆用查找到的 GAID， 将组播业务包下发给所述业务区域内的 ASR下终 端的步骤包括： 业务区域内的 ASR将组播业务包的 GRID替换为查找到的 GAID, 将替换后的组播业务包下发给所述业务区域内的 ASR下终端。
采用查找到的 GRID, 将组播业务包发送到核心路由器的步骤包括： 组 播源所属的 ASR将查找到的 GRID封装到组播业务包中，将重封装后的组播 业务包发送到核心路由器；
采用查找到的 GAID, 将组播业务包下发给所述业务区域内的 ASR下终 端的步骤包括： 业务区域内的 ASR将 GRID替换为查找到的 GAID , 并去除 组播业务包中封装的原 GAID, 并发送给所述业务区域内的 ASR下终端。
终端根据接收到的组播业务包的 GAID判断该组播业务包是否属于所请 求的组播业务， 如果是， 则解封装该组播业务包， 得到业务数据； 否则， 丟 弃该组播业务包。
所述采用查找到的 GRID, 将所述组播业务包发送到核心路由器的步骤 还包括：
组播源发送组播业务包时， 还将该组播业务包的源地址设置为其自身的 AID; 以及
组播源所属的 ASR将组播业务包的 GAID替换为查找到的 GRID时， 还 将组播业务包的 AID替换为从所建立的 AID-RID映射表中查找到的 RID; 所述采用查找到的 GAID, 将所述组播业务包下发给所述业务区域内的 AS 下终端的步骤还包括：业务区域内的 ASR将组播业务包的 GRID替换为 查找到的 GAID时，还将组播业务包的 RID替换为从所建立的 AID-RID映射 表中查找到的 AID。
所述采用查找到的 GRID, 将所述组播业务包发送到核心路由器的步骤 还包括： 组播源发送组播业务包时， 还将该组播业务包的源地址设置为其自 身的 AID; 以及
组播源所属的 ASR将查找到的 GRID封装到组播业务包中时， 还将从所 保存的 AID-RID映射表中查找到的 RID封装到组播业务包中；
所述采用查找到的 GAID, 将所述组播业务包下发给所述业务区域内的 ASR 下终端的步骤还包括： 业务区域内的 ASR将 GRID 替换为查找到的 GAID, 并去除组播业务包中封装的原 GAID时， 还将封装的 RID去除。
一种实现组播业务的系统， 包括组播源、 组播源所属的 ASR、 核心路由 器和业务区域内的 ASR, 其中：
组播源设置为： 发送组播业务包， 将该组播业务包的目的地址设置成为 其分配的组播接入标识 GAID;
组播源所属的 ASR设置为： 在接收到组播业务包后， 根据 GAID从所建 立的 GAID-组播路由标识 GRID映射表中查找对应的 GRID, 采用查找到的 GRID , 将组播业务包发送到核心路由器；
核心路由器设置为： 根据组播业务包的 GRID查找对应的组播树， 根据 组播树向业务区域内的 ASR下发组播业务包；
业务区域内的 ASR设置为： 根据 GRID从所建立的 GAID-GRID映射表 中查找对应的 GAID , 采用查找到的 GAID , 将组播业务包下发给所述业务区 域内的 ASR下终端。
该系统还包括 ILR, 其中，
组播源还设置为： 在发送组播业务包之前， 申请 GAID和 GRID， 在得到 GRID后， 向 ILR请求进行鉴权；
ILR设置为： 根据组播源的请求对组播源进行鉴权， 若鉴权成功， 则将 组播源的 GAID和 GRID发送给业务区域内的 ASR;
业务区域内的 ASR 还设置为： 在接收到 GAID 和 GRID 后， 建立 GAID-GRID映射表。
组播源所属的 ASR是设置为： 按如下方式采用查找到的 GRID , 将组播 业务包发送到核心路由器： 将组播业务包的 GAID替换为查找到的 GRID,将 替换后的组播业务包发送到核心路由器；
业务区域内的 ASR是设置为： 按如下方式釆用查找到的 GAID， 将组播 业务包下发给所述业务区域内的 ASR下终端： 将组播业务包的 GRID替换为 查找到的 GAID, 将替换后的组播业务包下发给所述业务区域内的 ASR下终 端。
组播源所属的 ASR还设置为： 按如下方式釆用查找到的 GRID， 将组播 业务包发送到核心路由器： 将查找到的 GRID封装到组播业务包中， 将重封 装后的组播业务包发送到核心路由器；
业务区域内的 ASR还设置为： 按如下方式采用查找到的 GAID , 将组播 业务包下发给所述业务区域内的 ASR 下终端： 将 GRID 替换为查找到的 GAID,并去除组播业务包中封装的原 GAID，并发送给所述业务区域内的 ASR 下终端。 本申请还公开了一种边缘路由器 （ASR ) ， 所述 ASR是组播源所属的 AS , 或者所述 ASR为业务区域内的 ASR。
所述组播源所属的 ASR设置为： 在接收到组播业务包后， 根据组播接入 标识 （GAID )从所建立的 GAID-组播路由标识 （GRID ) 映射表中查找对应 的 GRID, 釆用查找到的 GRID, 将所述组播业务包发送到核心路由器， 使所 述核心路由器， 根据所述组播业务包的 GRID查找对应的组播树， 根据组播 树向业务区域内的 ASR下发组播业务包； 所述组播业务包由组播源发送给所 述组播源所属的 ASR, 该组播业务包的目的地址设置成为分配的 GAID; 所述业务区域内的 ASR设置为：根据所述 GRID从所建立的 GAID-GRID 映射表中查找对应的 GAID， 釆用查找到的 GAID， 将所述组播业务包下发给 所述业务区域内的 ASR下终端。
所述业务区域内的 ASR还设置为： 在接收到所述 GAID和 GRID后 , 建 立 GAID-GRID映射表。
所述组播源所属的 ASR是设置为： 按如下方式釆用查找到的 GRID， 将 所述组播业务包发送到核心路由器： 将所述组播业务包的 GAID替换为查找 到的 GRID, 将替换后的组播业务包发送到核心路由器；
所述业务区域内的 ASR是设置为： 按如下方式采用查找到的 GAID , 将 所述组播业务包下发给所述业务区域内的 ASR下终端： 将所述组播业务包的 GRID替换为查找到的 GAID，将替换后的组播业务包下发给所述业务区域内 的 ASR下终端。
所述组播源所属的 ASR还设置为： 按如下方式采用查找到的 GRID , 将 所述组播业务包发送到核心路由器： 将查找到的 GRID封装到所述组播业务 包中， 将重封装后的组播业务包发送到核心路由器；
所述业务区域内的 ASR还设置为： 按如下方式釆用查找到的 GAID , 将 所述组播业务包下发给所述业务区域内的 ASR下终端： 将所述 GRID替换为 查找到的 GAID, 并去除所述组播业务包中封装的原 GAID, 并发送给所述业 务区域内的 ASR下终端。 综上所述， 本发明通过使用 GAID在 ASR与终端之间标识组播业务包， 使用 GRID在核心网中标识组播业务包，从而在 LISN等位置标识与身份标识 分离的网络中实现组播业务， 本发明无需改变终端并可兼容现有的 IPv4网络 和 IPv6网络。 附图概述
图 1为现有技术中 LISN网络的架构图；
图 2为本发明实现组播业务的方法的流程图；
图 3为本发明实现组播业务的系统的架构图。 本发明的较佳实施方式
本发明中定义两种组播地址，组播 AID ( Group AID, GAID )和组播 RID ( Group, GRID ) ， 其中， GAID用于在终端和 ASR之间标识组播流， 其作 用范围等同于 AID， 采用 128位编码。 GRID用于在核心网中标识组播流， 其 作用范围等同于 RID， 在 IPv6协议中采用 128位编码 , 在 IPv4协议中采用
32位编码。
GRID可以取 IPv4或 IPv6组播地址空间中未使用的地址。 GAID可以取 IPv6组播地址空间中未使用的地址。 为了简化设计， 可以将 GRID和 GAID 取为同一空间的相同地址。
下面结合附图对本发明的实现组播业务的方法进行详细说明。
图 2为本发明实现组播业务的方法， 包括：
201： 组播源的用户向管理机构或网絡中的地址服务器申请 GAID 和 GRID;
202: 管理机构或地址服务器为组播源分配 GAID和 GRID, 并将 GAID 下发给组播源；
管理机构或地址服务器为组播源分配的 GAID和 GRID需要在 LISN网络 中唯一。
之所以仅将 GAID下发给组播源 , 是因为 GRID用于在核心网中标识组 播流， 如果下发给组播源会使组播源了解核心网的传输信息， 会对网络安全 造成风险。
203: 管理机构在身份位置寄存器（Identity Location Register, ILR ) 中将 为组播源分配的 GAID和 GRID与组播源的 AID进行绑定；
204: 组播源向其所属的 ASR发送组播控制包， 要求进行鉴权；
205: 组播源所属的 ASR接收到组播控制包后 , 将该组播源的 GAID和 / 或 AID通过其上层的核心路由器发送给 ILR;
206: ILR根据接收到的 GAID和 /或 AID查询绑定关系 , 若得到组播源 的 GRID,则鉴权成功 ,将组播源的 GAID和 GRID发送给业务区域内的 ASR;
207：业务区域内的 ASR接收到组播源的 GAID和 GRID后，建立该 GAID 与 GAID的映射表（ GAID-GRID映射表） ， 并建立自身 RID与 AID的映射 表（ AID-RID映射表） ， 组播源所属的 ASR通知组播源鉴权成功；
208: 业务区域内的 ASR向其管理区域内的终端广播 GAID;
209: 终端根据接收到的 GAID决定是否接收组播业务， 若接收， 则向其 所属的 ASR发送通知消息， 请求开通该组播业务；
业务运营中， 需要发布不同 GAID所代表的组播业务， 用户可通过查询 来获知接收到的 GAID所代表的组播业务， 以决定是否接收该组播业务。
ASR采用组成员关系协议（ Internet Group Management Protocol , IGMP ) 周期性地向其下的终端广播 GAID。
为避免广播风暴， ASR需要支持层二组播协议， 如 IGMP Proxy和 IGMP Snooping等。
210: ASR在接收到其下终端的通知消息后， 向其上层的核心路由器发送 通知消息， 请求加入组播业务群；
211 : 核心路由器在组播树中添加到达该发送通知消息的 ASR的路由；
AS 在下发 GAID后， 若未接收到终端的通知消息， 则请求其上层的核 心路由器删除其在组播树中的路由。
212: 组播源发送组播业务包， 目的地址是为其分配的 GAID, 源地址是 其自身的 AID, 格式为 GAID: AID: DATA;
213: 组播业务包到达组播源所属的 ASR后， 该 ASR根据本地存储的 GAID-GRID映射表和 AID-RID映射表，将组播业务包的 GAID替换为 GRID， 将 AID替换为 RID, 格式为： GRID: RID: DATA, 并将组播业务包发送到 核心网中；
214: 网络中的核心路由器根据组播业务包的 GRID查找相应的组播树， 按照组播树向业务区域内的 ASR下发组播业务包；
LISN釆用协议无关组播（Protocol Independent Multicast, PIM )协议作 为组播路由协议。 ASR和核心路由器（ General Switch Router , GSR ) 负责组 播路由 PIM的建立和维护。
215: 接收到组播业务包的 ASR根据本地存储的 GRID-GAID映射表和 AID-RID映射表， 将 GRID替换为 GAID， RID替换为 AID, 格式为 GAID: AID: DATA, 并发送给其下的终端；
在组播业务包中携带组播源的 RID, 是为了在多源组播业务中， 查找到 组播业务包的实际发送者。
216:终端根据接收到的组播业务包的 GAID判断该组播业务包是否属于 其请求的组播业务， 如果是， 解包获得业务数据； 否则， 丢弃该组播业务包。
以上实施例中， 步骤 212〜214采用地址替换的方式转发组播业务包， 还 可以釆用二次封装的方式转发组播业务包， 包括如下步骤：
a: 组播源发送组播业务包， 目的地址是为其分配的 GAID, 源地址是其 自身的 AID, 格式是 GAID: AID: DATA;
b: 组播业务包到达组播源所属的 ASR后， 该 ASR根据本地存储的
GAID-GRID映射表和 AID-RID映射表， 查找 GAID对应的 GRID, AID对应 的 RID， 组成一个 IPinIP包， 格式为： GRID:RID:GAID:AID:DATA， 将该组 播业务包发送到网络中； c: 网络中的核心路由器根据组播业务包的 GRID查找相应的组播树， 按 照组播树向业务区域内的 ASR下发组播业务包；
d: 接收到组播业务包的 ASR根据本地存储的 GRID-GAID映射表， 将 GRID替换为查找到的 GAID, 并去除 RID和原 GAID, 组播业务包的格式变 为 GAID: AID: DATA, 将组播业务包发送给其下的终端。
图 3所示为本发明实现组播业务的系统， 包括： 组播源、 组播源所属的 ASR、 核心路由器、 业务区域内的 ASR和 ILR, 其中：
组播源，用于在发送组播业务包之前，申请 GAID和 GRID，在得到 GRID 后， 向 ILR请求进行鉴权； 还用于发送组播业务包， 将该组播业务包的目的 地址设置成为其分配的组播接入标识 GAID；
组播源所属的 ASR, 用于在接收到组播业务包后， 根据 GAID从所建立 的 GAID-组播路由标识 GRID 映射表中查找对应的 GRID, 采用查找到的 GRID， 将组播业务包发送到核心路由器； 釆用查找到的 GRID， 将组播业务 包发送到核心路由器的过程包括： 将组播业务包的 GAID 替换为查找到的 GRID, 将替换后的组播业务包发送到核心路由器； 或将查找到的 GRID封装 到组播业务包中， 将重封装后的组播业务包发送到核心路由器；
核心路由器， 用于根据组播业务包的 GRID查找对应的组播树， 根据组 播树向业务区域内的 ASR下发组播业务包；
业务区域内的 ASR,还用于在接收到 GAID和 GRID后，建立 GAID-GRID 映射表， 还用于根据 GRID 从所建立的 GAID-GRID 映射表中查找对应的 GAID, 采用查找到的 GAID, 将组播业务包下发给其下终端， 采用查找到的 GAID， 将组播业务包下发给其下终端的过程包括： 将组播业务包的 GRID替 换为查找到的 GAID,将替换后的组播业务包下发给其下终端； 或将 GRID替 换为查找到的 GAID, 并去除组播业务包中封装的原 GAID, 并发送给终端。
IL , 用于根据组播源的请求对组播源进行鉴权， 若鉴权成功， 则将组播 源的 GAID和 GRID发送给业务区域内的 ASR。
系统中网络设备的其它相关功能， 请参见方法内容的描述。 上述内容仅为本发明的最佳实施方案， 其并非用来限制本发明的具体实 施方式， 凡根据本方法的主要发明构思而进行的修改和变动， 均应属于本发 明权利要求书所要求的保护范围。
工业实用性
本发明通过使用 GAID在 ASR与终端之间标识组播业务包， 使用 GRID 在核心网中标识组播业务包，从而在 LISN等位置标识与身份标识分离的网络 中实现组播业务， 本发明无需改变终端并可兼容现有的 IPv4 网络和 IPv6 网 络。

Claims

权 利 要 求 书
1、 一种实现组播业务的方法， 所述方法包括：
组播源发送组播业务包， 将该组播业务包的目的地址设置成为所述组播 源分配的组播接入标识 （GAID ) ；
所述组播源所属的边缘路由器 （ASR )接收到所述组播业务包后， 根据 所述 GAID从所建立的 GAID-组播路由标识 （GRID ) 映射表中查找对应的 GRID， 釆用查找到的 GRID， 将所述组播业务包发送到核心路由器；
所述核心路由器 （GSR )根据所述组播业务包的 GRID查找对应的组播 树， 根据所述组播树向业务区域内的 ASR下发组播业务包； 以及
业务区域内的 ASR根据所述 GRID从所建立的 GAID-GRID映射表中查 找对应的 GAID， 釆用查找到的 GAID, 将所述组播业务包下发给所述业务区 域内的 ASR下终端。
2、 如权利要求 1所述的方法， 该方法还包括：
所述组播源在发送所述组播业务包之前， 申请所述 GAID和 GRID ,在得 到所述 GRID后， 向身份位置寄存器 （ILR )请求进行鉴权；
若鉴权成功， 则所述 ILR将所述组播源的 GAID和 GRID发送给所述业 务区域内的 ASR; 以及
所述业务区域内的 ASR在接收到所述 GAID 和 GRID 后， 建立所述 GAID-GRID映射表。
3、 如权利要求 2所述的方法， 所述方法还包括：
所述业务区域内的 ASR在接收到所述 GAID和 GRID后， 还向所述业务 区域内的 ASR下的终端广播所述 GAID;
所述业务区域内的 ASR下的终端根据接收到的 GAID 决定是否接收该 GAID标识的组播业务， 若接收， 则向自身所属的 ASR请求开通该组播业务； 所述业务区域内的 ASR根据所述终端的请求， 向上层的 GSR请求加入 所述 GAID标识的组播业务的业务群； 以及
所述 GSR根据 ASR的请求在所述组播树中， 添加到达发出请求的 ASR 的路由。
4、 如权利要求 2所述的方法， 其中，
在所述 ILR中配置有为所述组播源分配的 GAID和 GRID与所述组播源 的 AID的绑定关系；
所述鉴权的步骤包括：
所述组播源向所属的 ASR发送组播控制包， 该 ASR将所述组播源的 GAID和 /或 AID发送给所述 ILR; 以及
所述 ILR根据接收到的 GAID和 /或 AID查询绑定关系，若得到所述组播 源的 GRID, 则鉴权成功。
5、 如权利要求 3所述的方法， 其中，
所述采用查找到的 GRID, 将所述组播业务包发送到核心路由器的步骤 包括： 所述组播源所属的 ASR将所述组播业务包的 GAID替换为查找到的 GRID, 将替换后的组播业务包发送到核心路由器；
所述采用查找到的 GAID, 将所述组播业务包下发给所述业务区域内的 AS 下终端的步骤包括： 所述业务区域内的 ASR将所述组播业务包的 GRID 替换为查找到的 GAID,将替换后的组播业务包下发给所述业务区域内的 ASR 下终端。
6、 如权利要求 3所述的方法， 其中，
所述采用查找到的 GRID, 将所述组播业务包发送到核心路由器的步骤 包括： 所述组播源所属的 ASR将查找到的 GRID封装到所述组播业务包中， 将重封装后的组播业务包发送到核心路由器；
所述釆用查找到的 GAID， 将所述组播业务包下发给所述业务区域内的 AS 下终端的步骤包括：所述业务区域内的 ASR将所述 GRID替换为查找到 的 GAID, 并去除所述组播业务包中封装的原 GAID, 并发送给所述业务区域 内的 ASR下终端。
7、 如权利要求 5或 6所述的方法， 该方法还包括：
所述终端根据接收到的组播业务包的 GAID判断该组播业务包是否属于 所请求的组播业务， 如果是， 则解封装该组播业务包， 得到业务数据； 否则， 丢弃该组播业务包。
8、 如权利要求 5所述的方法， 其中， 所述采用查找到的 GRID, 将所述 组播业务包发送到核心路由器的步骤还包括：
所述组播源发送组播业务包时， 还将该组播业务包的源地址设置为自身 的 AID; 以及
所述组播源所属的 ASR将所述组播业务包的 GAID 替换为查找到的 GRID时， 还将组播业务包的 AID替换为从所建立的 AID-RID映射表中查找 到的 RID;
所述采用查找到的 GAID, 将所述组播业务包下发给所述业务区域内的
AS 下终端的步骤还包括： 所述业务区域内的 ASR 将所述组播业务包的 GRID替换为查找到的 GAID时， 还将组播业务包的 RID替换为从所建立的 AID-RID映射表中查找到的 AID。
9、 如权利要求 6所述的方法， 其中，
所述采用查找到的 GRID, 将所述组播业务包发送到核心路由器的步骤 还包括： 所述组播源发送组播业务包时， 还将该组播业务包的源地址设置为 自身的 AID; 以及
所述组播源所属的 ASR将查找到的 GRID封装到所述组播业务包中时， 还将从所保存的 AID-RID映射表中查找到的 RID封装到组播业务包中；
所述采用查找到的 GAID, 将所述组播业务包下发给所述业务区域内的
ASR下终端的步骤还包括：所述业务区域内的 ASR将所述 GRID替换为查找 到的 GAID, 并去除所述组播业务包中封装的原 GAID时， 还将封装的 RID 去除。
10、 一种实现组播业务的系统， 所述系统包括组播源、 组播源所属的边 缘路由器 （ASR ) 、 核心路由器和业务区域内的 ASR, 其中：
所述组播源设置为： 发送组播业务包， 将该组播业务包的目的地址设置 成为分配的组播接入标识 （GAID ) ；
所述组播源所属的 ASR设置为： 在接收到所述组播业务包后， 根据所述 GAID从所建立的 GAID-组播路由标识（ GRID )映射表中查找对应的 GRID, 采用查找到的 GRID, 将所述组播业务包发送到核心路由器；
所述核心路由器设置为： 根据所述组播业务包的 GRID查找对应的组播 树， 根据组播树向业务区域内的 ASR下发组播业务包；
所述业务区域内的 ASR设置为：根据所述 GRID从所建立的 GAID-GRID 映射表中查找对应的 GAID, 采用查找到的 GAID, 将所述组播业务包下发给 所述业务区域内的 ASR下终端。
11、 如权利要求 10所述的系统， 该系统还包括 ILR, 其中，
所述组播源还设置为： 在发送所述组播业务包之前， 申请所述 GAID和 GRID, 在得到所述 GRID后， 向身份位置寄存器 （ ILR )请求进行鉴权； 所述 ILR设置为： 根据所述组播源的请求对所述组播源进行鉴权， 若鉴 权成功， 则将所述组播源的 GAID和 GRID发送给业务区域内的 ASR;
所述业务区域内的 ASR还设置为： 在接收到所述 GAID和 GRID后， 建 立所述 GAID-GRID映射表。
12、 如权利要求 10所述的系统， 其中，
所述组播源所属的 ASR是设置为： 按如下方式采用查找到的 GRID , 将 所述组播业务包发送到核心路由器： 将所述组播业务包的 GAID替换为查找 到的 GRID, 将替换后的组播业务包发送到核心路由器；
所述业务区域内的 ASR是设置为： 按如下方式采用查找到的 GAID , 将 所述组播业务包下发给所述业务区域内的 ASR下终端： 将所述组播业务包的 GRID替换为查找到的 GAID ,将替换后的组播业务包下发给所述业务区域内 的 ASR下终端。
13、 如权利要求 10所述的系统， 其中，
所述组播源所属的 ASR还设置为： 按如下方式采用查找到的 GRID , 将 所述组播业务包发送到核心路由器： 将查找到的 GRID封装到所述组播业务 包中， 将重封装后的组播业务包发送到核心路由器；
所述业务区域内的 ASR还设置为： 按如下方式釆用查找到的 GAID , 将 所述组播业务包下发给所述业务区域内的 ASR下终端： 将所述 GRID替换为 查找到的 GAID, 并去除所述组播业务包中封装的原 GAID, 并发送给所述业 务区域内的 ASR下终端。
14、 一种边缘路由器 （ASR ) , 所述 ASR是组播源所属的 ASR, 或者 所述 ASR为业务区域内的 ASR。
15、 如权利要求 14所述的 ASR， 其中，
所述组播源所属的 ASR设置为： 在接收到组播业务包后， 根据组播接入 标识 （GAID )从所建立的 GAID-组播路由标识 （GRID ) 映射表中查找对应 的 GRID, 采用查找到的 GRID, 将所述組播业务包发送到核心路由器， 使所 述核心路由器， 根据所述组播业务包的 GRID查找对应的组播树， 根据组播 树向业务区域内的 ASR下发组播业务包； 所述组播业务包由组播源发送给所 述组播源所属的 ASR, 该组播业务包的目的地址设置成为分配的 GAID; 所述业务区域内的 ASR设置为：根据所述 GRID从所建立的 GAID-GRID 映射表中查找对应的 GAID, 采用查找到的 GAID, 将所述组播业务包下发给 所述业务区域内的 ASR下终端。
16、 如权利要求 14所述的 ASR, 其中， 所述业务区域内的 ASR还设置 为： 在接收到所述 GAID和 GRID后， 建立 GAID-GRID映射表。
17、 如权利要求 15所述的 ASR, 其中，
所述组播源所属的 ASR是设置为： 按如下方式釆用查找到的 GRID， 将 所述组播业务包发送到核心路由器： 将所述组播业务包的 GAID替换为查找 到的 GRID, 将替换后的组播业务包发送到核心路由器；
所述业务区域内的 ASR是设置为： 按如下方式采用查找到的 GAID , 将 所述组播业务包下发给所述业务区域内的 ASR下终端： 将所述组播业务包的 GRID替换为查找到的 GAID，将替换后的组播业务包下发给所述业务区域内 的 ASR下终端。
18、 如权利要求 15所述的 ASR, 其中，
所述组播源所属的 ASR还设置为： 按如下方式采用查找到的 GRID , 将 所述组播业务包发送到核心路由器： 将查找到的 GRID封装到所述组播业务 包中， 将重封装后的组播业务包发送到核心路由器； 所述业务区域内的 ASR还设置为： 按如下方式采用查找到的 GAID， 将 所述组播业务包下发给所述业务区域内的 ASR下终端： 将所述 GRID替换为 查找到的 GAID, 并去除所述组播业务包中封装的原 GAID, 并发送给所述业 务区域内的 ASR下终端。
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KR20120055678A (ko) 2012-05-31
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