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WO2009039785A1 - Méthode et dispositif d'établissement de voies de transmission en multidiffusion et mise en oeuvre de transmissions en multidiffusion - Google Patents

Méthode et dispositif d'établissement de voies de transmission en multidiffusion et mise en oeuvre de transmissions en multidiffusion Download PDF

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Publication number
WO2009039785A1
WO2009039785A1 PCT/CN2008/072443 CN2008072443W WO2009039785A1 WO 2009039785 A1 WO2009039785 A1 WO 2009039785A1 CN 2008072443 W CN2008072443 W CN 2008072443W WO 2009039785 A1 WO2009039785 A1 WO 2009039785A1
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WO
WIPO (PCT)
Prior art keywords
network
multicast
multicast address
peripheral client
client network
Prior art date
Application number
PCT/CN2008/072443
Other languages
English (en)
Chinese (zh)
Inventor
Jianping Wu
Wei Cao
Mingwei Xu
Yong Cui
Yuntao Zhou
Original Assignee
Huawei Technologies Co., Ltd.
Tsinghua University
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 Huawei Technologies Co., Ltd., Tsinghua University filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009039785A1 publication Critical patent/WO2009039785A1/fr

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the present invention relates to the field of network communication technologies, and in particular, to a method and an apparatus for establishing a multicast transmission path and implementing multicast transmission.
  • IPv4 fourth-generation Internet Protocol
  • IPv6 sixth generation Internet Protocol
  • IPv6 Intra Network Internet Protocol
  • E-IP Extra Network Internet Protocol
  • the prior art proposes a multicast translation technology based on address translation.
  • the basic idea of the technology is: at the Provider Edge router (PE), E - IP multicast control packets and multicast data packets are translated into I-IP multicast control messages and multicast data packets, respectively, where the PE router is an edge router between the intermediate transport network and the peripheral customer network. Then, the PE transmits the translated I-IP multicast packet to the I-IP network, and then restores the packet to the corresponding E-IP multicast packet when the packet reaches the egress PE. The message continues to be transmitted over the E-IP network.
  • PE Provider Edge router
  • E-IP multicast data can be established on the transport provider router (P, Provider router) of the I-IP network.
  • P Provider router
  • An E-IP multicast tree corresponds to an I-IP multicast tree in the I-IP network.
  • IPv6 the protocol running on the intermediate transport network
  • IPv4 the protocol running on the peripheral client network
  • IPv6 prefix is a specific IPv6 address prefix, so that the PE router receives the prefix. After the IPv6 address, it can be handed over to the corresponding restore module for processing.
  • the specific address prefix can be obtained through address allocation or internally configured by an Internet Service Provider (ISP).
  • ISP Internet Service Provider
  • IPv4 unicast or multicast routing table in the form a.b.c.d/M, where M is the bit length of the mask.
  • 4over6 address mapping it can be transformed into a pseudo IPv6 address: 4over6prefix: a.b.c.d /len+M.
  • 4over6prefix/len is a pseudo-IPv6 address-specific prefix with a length of len.
  • the pseudo-IPv6 address-specific prefix can be obtained through address allocation, or can be allocated and managed by an ISP, so that all PEs can be identified without negotiation.
  • the 4over6 border router uses the pseudo IPv6 address prefix 4over6prefix/len to prefix match the destination address. If the prefix within the len prefix length is the same, then the IPv6 route is determined to be a pseudo IPv6 route, and then the inverse transform of the 4over6 route conversion is performed. Perform a route restore.
  • the above multicast transition technology can establish a multicast transmission path under the condition that I-IP and E-IP are different, and use the path to implement network communication of the peripheral customer network through the intermediate transmission network, the technology still has the following disadvantages. :
  • I-IP The intermediate P router of the transport network also needs to support this addressing mechanism accordingly, which also brings great implementation difficulty to the implementation of the above prior art.
  • the purpose of the embodiments of the present invention is to provide a method and a device for establishing a multicast transmission path and implementing multicast transmission, so as to enable a multicast transmission path and implementation of the intermediate transmission network to be established without using the above translation mechanism. Multicast transmission.
  • a method for establishing a multicast transmission path comprising:
  • the request join message includes a multicast address of a peripheral client network of the multicast group that requests to join;
  • the multicast transmission path corresponding to the multicast address of the peripheral client network is established in the intermediate transmission network during the transmission of the intermediate transmission network by the request-joining message carrying the multicast address of the intermediate transmission network;
  • the multicast transmission path is identified by the intermediate transmission network multicast address.
  • a device for establishing a multicast path comprising:
  • the first packet transmission unit is configured to send, after receiving the request to join the packet, the peripheral client network carrying the multicast address of the peripheral client network, sending the request join message to the located address according to the multicast address of the peripheral client network An ingress PE corresponding to the other side of the intermediate transmission network and corresponding to the peripheral client network multicast address;
  • a message processing unit configured to receive an intermediate transport network multicast address allocated by the ingress PE for the peripheral client network multicast address, and construct a request join message carrying the intermediate transport network multicast address;
  • a second packet transmission unit configured to add the request carrying the intermediate transmission network multicast address to the intermediate transmission network for transmission, to use the request to join the transmission process of the text in the intermediate transmission network, in the middle
  • a multicast transmission path corresponding to the multicast address of the peripheral client network is established in the transport network, where the multicast transmission path is identified by the intermediate transport network multicast address.
  • a device for establishing a multicast path comprising:
  • a multicast address allocation unit configured to allocate a corresponding intermediate transmission network multicast address to the peripheral client network multicast address after receiving the request for adding the multicast address of the peripheral client network sent by the egress PE;
  • the address sending unit is configured to send the intermediate transmission network multicast address allocated by the multicast address allocation unit to the egress PE through signaling of the intermediate transmission network.
  • a method for implementing multicast transmission comprising:
  • a device for implementing multicast transmission comprising:
  • a multicast data packet receiving unit configured to receive a peripheral client network multicast data packet from a peripheral client network, where the peripheral client network multicast data packet includes a peripheral client network multicast address;
  • Corresponding relationship storage unit configured to store a correspondence between a peripheral client network multicast address and an intermediate transport network multicast address allocated for the peripheral client network multicast address
  • a multicast transmission path determining unit configured to: according to the peripheral client network multicast address in the peripheral client network multicast data packet, and the peripheral client network multicast address stored in the corresponding relationship storage unit and the corresponding intermediate transport network multicast Corresponding relationship of the address, determining an intermediate transmission network multicast address corresponding to the peripheral client network multicast address, and determining a group in the intermediate transmission network corresponding to the intermediate transmission network multicast address according to the intermediate transmission network multicast address Broadcast transmission path;
  • a multicast data packet sending unit configured to encapsulate the peripheral client network multicast data packet into the middle After transmitting the multicast data packet, the multicast transmission path in the intermediate transmission network is sent to the corresponding egress PE.
  • the corresponding intermediate transmission network multicast address is allocated to the peripheral client network multicast address, and the request carrying the intermediate transmission network multicast address is added to the message and transmitted in the intermediate transmission network.
  • the embodiment of the present invention provides a feasible implementation manner, and does not need to upgrade a large number of non-edge routers in the intermediate transmission network, has good operability, and can fully save costs in the implementation process, and is beneficial to multicast. Rapid use of technology.
  • FIG. 1 is a translation format used in the translation of different network protocols in the prior art
  • FIG. 2 is a flowchart of a method for establishing a multicast transmission path according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for establishing a multicast transmission path according to another embodiment of the present invention
  • FIG. 4 is a schematic diagram of an apparatus for establishing a multicast transmission path according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of an apparatus for establishing a multicast transmission path according to another embodiment of the present invention
  • FIG. 6 is a flowchart of a method for implementing multicast transmission according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of an apparatus for implementing multicast transmission according to an embodiment of the present invention.
  • Step 201 An egress router edge router ( ⁇ ) receives a request to join a message from a peripheral client network, where An edge router is located between the intermediate transport network and the peripheral client network, and the request join message includes a multicast address of a peripheral client network of the multicast group that requests to join;
  • Step 202 The egress port determines, according to the multicast address of the peripheral client network, that the multicast source is located in a peripheral client network connected to the other side of the intermediate transport network, and joins the request. 4 ⁇ is sent to the entry PE;
  • Step 203 The egress PE receives the intermediate transport network multicast address allocated by the ingress PE for the peripheral client network multicast address, and transmits a request carrying the intermediate transport network multicast address in the intermediate transport network. Adding a message, and establishing a multicast transmission path corresponding to the multicast address of the peripheral client network in the intermediate transmission network during the process of transmitting the request to join the intermediate transmission network; wherein the multicast transmission path It is identified by the intermediate transmission network multicast address.
  • the method for establishing the multicast transmission path may further include:
  • the ingress PE After receiving the request to join the packet, the ingress PE determines, according to the intermediate transmission network multicast address carried in the packet, the corresponding peripheral client network multicast address, and connects to the peripheral client connected thereto.
  • the network sends a request to join the packet carrying the peripheral client network multicast address, and in the process of transmitting the message in the peripheral client network, the group corresponding to the peripheral client network multicast address is established in the peripheral client network. Broadcast transmission path.
  • the address of the multicast source included in the multicast address of the peripheral client network is represented by s
  • the address of the multicast group included in the multicast address of the peripheral client network is represented by g
  • join (s, g) indicates that the peripheral client network requests to join the message
  • g indicates the intermediate transmission network multicast address
  • s indicates the intermediate transmission network address of the ingress PE, with join(s,, g ,) indicates that the intermediate transmission network requests to join the text.
  • implementing a multicast transmission path for establishing an intermediate transmission network includes the following steps:
  • Step 301 The join(s, g) packet of the E-IP network reaches the egress PE directly connected to it;
  • Step 302 The egress PE finds that the multicast source corresponding to the s is located on the other side of the intermediate transmission network, and determines, according to the s, the PE connected to the peripheral client network where the multicast source is located. , the PE is the ingress PE;
  • Step 303 The egress PE sends a request join message (s, g) to the ingress PE through I-IP signaling, where the multicast address (s, g) in the E-IP format is E-IP format.
  • Multicast address which is the multicast address of the peripheral client network;
  • Step 304 After receiving the join (s, g) message, the ingress PE is a multicast for the peripheral client network.
  • the address (s, g) is assigned a corresponding I-IP multicast address g, that is, an intermediate transport network multicast address, and the corresponding relationship between (s, g) and g is recorded locally;
  • Step 305 The ingress PE sends the intermediate transmission network multicast address g to the egress PE through I-IP signaling through the intermediate transmission network.
  • Step 306 The egress PE receives the intermediate transmission network multicast address g, and then sends a request to join the packet to the ingress PE through the intermediate transmission network, where the request packet carries at least the intermediate transmission network group.
  • the broadcast address g in the preferred embodiment of the present invention, the multicast source address of the packet is the I-IP address s of the ingress PE in the intermediate transport network; the 4 ⁇ text is represented as join(s,, g ,); in the join (s,, g') 3 ⁇ 4 text in the middle of the transmission network transmission process, establish a multicast corresponding to the peripheral customer network multicast address (s, g) in the intermediate transmission network
  • the transmission path which is the multicast tree, completes the process of establishing a multicast transmission path in the intermediate transmission network.
  • the method for establishing a multicast transmission path may further include the following steps:
  • Step 307 After receiving the join (s, g,) message, the ingress PE searches for the corresponding relationship recorded in step 304, so as to find the corresponding multicast address g of the intermediate transmission network. Peripheral customer network multicast address (s, g);
  • Step 308 The ingress PE sends a request to join the packet carrying the peripheral client network multicast address ( s , g) to the E-IP network connected thereto, that is, the peripheral client network, where the packet is on the periphery.
  • the multicast transmission path corresponding to the multicast address (s, g) of the peripheral client network is established in the peripheral client network.
  • the corresponding multicast transmission path can be established simultaneously in the peripheral client network and the intermediate transmission network.
  • the process of establishing a multicast transmission path in different networks is independent of each other.
  • the embodiment of the present invention further provides an apparatus for establishing a multicast path.
  • the apparatus includes:
  • a first message transmission unit 401 configured to: after receiving a request to join a message from a peripheral client network carrying a multicast address of a peripheral client network, adding the request according to the multicast address of the peripheral client network The message is sent to the ingress PE located on the other side of the intermediate transmission network;
  • a message processing unit 402 configured to: receive the ingress PE as the peripheral client network group An intermediate transmission network multicast address allocated by the broadcast address, and a request for carrying the intermediate transmission network multicast address is added to join the message;
  • a second message transmission unit 403 configured to: add the request carrying the intermediate transmission network multicast address to the intermediate transmission network for transmission, to use the request to join the transmission of the message in the intermediate transmission network
  • the multicast transmission path corresponding to the multicast address of the peripheral client network is established in the intermediate transmission network, where the multicast transmission path is identified by the intermediate transmission network multicast address.
  • the apparatus shown in FIG. 4 corresponds to the egress PE described in the embodiment of the present invention.
  • the apparatus provided by the embodiment of the present invention includes:
  • the broadcast address assigning unit 501 is configured to allocate a corresponding intermediate transport network multicast address to the peripheral client network multicast address after receiving the request to join the packet sent by the egress PE and carrying the peripheral client network multicast address;
  • the address sending unit 502 is configured to send the intermediate transport network multicast address allocated by the multicast address allocating unit 501 to the egress PE through signaling of the intermediate transport network.
  • the device may further include:
  • the correspondence relationship storage unit 503 is configured to store a correspondence between the peripheral client network multicast address and the intermediate transport network multicast address allocated by the multicast address allocation unit to the peripheral client network multicast address.
  • the embodiment of the invention further provides a method and a device for implementing multicast transmission, and the method and the device are described in detail below with reference to specific examples.
  • a method for implementing multicast transmission includes the following steps: Step 601: The ingress PE receives a peripheral client network multicast data packet sent by the peripheral client network, according to the packet carried in the packet. a peripheral client network multicast address, and a correspondence between a peripheral client network multicast address stored in the ingress PE and a corresponding intermediate transport network multicast address, and determining an intermediate transport network multicast address corresponding to the peripheral client network multicast address;
  • Step 602 The ingress PE is used to determine the intermediate transmission network multicast address, determine a multicast transmission path in the intermediate transmission network corresponding to the intermediate transmission network multicast address, and multicast the peripheral customer network. After the data packet is encapsulated into an intermediate transport network multicast data packet, the data packet is sent to the corresponding egress PE through the multicast transmission path;
  • the method for implementing the multicast transmission may further include: after the egress PE receives the multicast data packet of the intermediate transmission network, the packet is decapsulated The peripheral client network multicast data packet is loaded, and the peripheral client network multicast data packet is forwarded in the peripheral client network until reaching the corresponding destination device.
  • an apparatus for implementing multicast transmission is further provided.
  • the apparatus includes:
  • the multicast data packet receiving unit 701 is configured to receive a peripheral client network multicast data packet from the peripheral client network, where the peripheral client network multicast data packet includes a peripheral client network multicast address;
  • Correspondence relationship storage unit 702 configured to store a correspondence between a peripheral client network multicast address and an intermediate transport network multicast address allocated for the peripheral client network multicast address;
  • the multicast transmission path determining unit 703 is configured to: according to the peripheral client network multicast address carried in the peripheral client network multicast data packet, and the peripheral client network multicast address and the corresponding intermediate transmission network stored by the correspondence relationship storage unit 702 Corresponding relationship of the multicast address, determining an intermediate transmission network multicast address corresponding to the peripheral client network multicast address, and determining the intermediate transmission network multicast address to be determined in the intermediate transmission network corresponding to the intermediate transmission network multicast address Multicast transmission path;
  • the multicast data packet sending unit 704 is configured to encapsulate the peripheral client network multicast data packet into an intermediate transport network multicast data packet, and determine, by using the determined multicast transmission path in the intermediate transport network The corresponding egress PE sends.
  • the corresponding intermediate transmission network multicast address is allocated to the peripheral client network multicast address, and the request carrying the intermediate transmission network multicast address is added to the intermediate transmission network.
  • the medium transmission enables the establishment of a multicast transmission path in the intermediate transmission network without performing translation between different network protocols, thereby effectively avoiding the translation of the multicast address from IPv6 to IPv4 or from IPv4 in the prior art.
  • the technology brought about by IPv6 implements complex problems. It can be foreseen that with the continuous popularization of various multimedia network applications such as live video broadcasting and web conferencing, multicast technology will be more and more applied.
  • the embodiments of the present invention provide a feasible implementation solution, which does not require upgrading a large number of non-edge routers in the intermediate transmission network, has good operability, and can fully save costs in the implementation process, and is beneficial to multicast. Rapid use of technology.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention porte sur une méthode et un dispositif d'établissement de voies de transmission en multidiffusion et sur une méthode et un dispositif de mise en oeuvre de transmissions en multidiffusion. La méthode d'établissement de voies de transmission en multidiffusion comporte les étapes suivantes: réception par un PE exportateur d'une demande conjointe d'un réseau de clients externe (201); transmission par le PE exportateur de la demande conjointe à un PE entré sur l'autre côté d'un réseau de transmission interne, basée sur les adresses multidiffusion d'un réseau de clients externe (202); réception des adresses multidiffusion du réseau interne de transmission attribuées aux adresses multidiffusion du réseau de clients externe par l'entrée; transmission de la demande conjointe portant les adresses multidiffusion du réseau interne de transmission dans le réseau de transmission interne; réception par le PE exportateur des adresses multidiffusion du réseau de transmission interne attribuées aux adresses multidiffusion du réseau de clients externe par le PE entré; établissement des voies de transmission multidiffusion correspondant aux adresses multidiffusion du réseau de clients externe dans le réseau de transmission interne pendant la transmission (203), et identification des voies de transmission multidiffusion avec les adresses multidiffusion du réseau de transmission interne.
PCT/CN2008/072443 2007-09-20 2008-09-22 Méthode et dispositif d'établissement de voies de transmission en multidiffusion et mise en oeuvre de transmissions en multidiffusion WO2009039785A1 (fr)

Applications Claiming Priority (2)

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CNA2007101546427A CN101394298A (zh) 2007-09-20 2007-09-20 建立组播传输路径、实现组播传输的方法及装置
CN200710154642.7 2007-09-20

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CN102143050A (zh) * 2010-09-29 2011-08-03 华为终端有限公司 用于IPv6网络的网络连接处理方法及其装置
CN102572007B (zh) * 2011-12-06 2015-05-27 华为技术有限公司 跨越IPv4网络转发IPv6组播报文的方法和边缘设备
CN103248577B (zh) * 2012-02-01 2016-03-30 华为技术有限公司 确定组播路径的方法、接收数据报文的方法及路由器
CN108512671A (zh) * 2017-02-24 2018-09-07 华为技术有限公司 一种外层组播ip地址分配方法以及装置

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