WO2013082947A1 - Procédé et dispositif périphérique pour réacheminer un message multicast ipv6 dans un réseau ipv4 - Google Patents

Procédé et dispositif périphérique pour réacheminer un message multicast ipv6 dans un réseau ipv4 Download PDF

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Publication number
WO2013082947A1
WO2013082947A1 PCT/CN2012/079078 CN2012079078W WO2013082947A1 WO 2013082947 A1 WO2013082947 A1 WO 2013082947A1 CN 2012079078 W CN2012079078 W CN 2012079078W WO 2013082947 A1 WO2013082947 A1 WO 2013082947A1
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WIPO (PCT)
Prior art keywords
multicast
ipv6
edge device
ipv4
packet
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PCT/CN2012/079078
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English (en)
Chinese (zh)
Inventor
张冀明
孙凡
章善惠
张怡
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华为技术有限公司
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Publication of WO2013082947A1 publication Critical patent/WO2013082947A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/167—Adaptation for transition between two IP versions, e.g. between IPv4 and IPv6
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1836—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with heterogeneous network architecture

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and an edge device for forwarding IPv6 multicast packets across an IPv4 network.
  • IP Internet Protocol
  • IP header length is not fixed, and the parsing overhead is large.
  • IPv4 allows the IP header to carry the option field of up to 40 bytes. This makes the IP header longer, which brings certain difficulties to packet parsing and increases the overhead of parsing the packet.
  • IPv4 protocol itself is rarely considered for security, although it is subsequently passed.
  • GRE GRE
  • IPSEC Internet Protocol Security
  • the IPv6 protocol In order to solve the above shortcomings of the IPv4 protocol, especially the address shortage problem, the IPv6 protocol came into being.
  • the IPv6 protocol extends the address space to 128b, providing an almost inexhaustible address.
  • the IPv6 protocol solves the problem of packet parsing and security authentication by fixing the length of the IPv6 header and increasing the extension header. Therefore, the replacement of the IPv4 protocol by the IPv6 protocol is the general trend.
  • IPv4 In the process of IPv4 replacing IPv4, the process of upgrading an old IPv4 network to an IPv6 network is a gradual process due to factors such as equipment cost and service stability, and is based on the edge device to the core device and the new network. The existing network is gradually advanced. So it can be foreseen for a long time in the future, IPv4 The coexistence of network and IPv6 network is a normal state, and the compatibility of the two is a major problem that needs to be solved. In the early stage of the evolution process, since the edge device and the newly built network will adopt the IPv6 protocol first, there will be a problem that IPv6 islands cross each other through the IPv4 network. At present, the unicast tunnel transition technologies between IPv6 isolated islands are diverse, mainly divided into IP tunneling technology and MPLS technology; however, there is no mature transition technology for IPv6 multicast. Summary of the invention
  • the embodiments of the present invention provide a method for forwarding IPv6 multicast packets across an IPv4 network, and an edge device, which is used to solve the problem that multicast packets in an IPv6 island traverse an IPv4 network.
  • An embodiment of the present invention provides a method for forwarding an IPv6 multicast packet across an IPv4 network, including: receiving, by the first edge device, an IPv6 multicast join request sent by an IPv6 user, where the IPv6 multicast join request carries the multicast Information
  • IPv4 multicast join request generated according to the IPv6 multicast join request, where the IPv4 multicast join request carries the multicast information
  • IPv4 packet sent by the second edge device Receiving the IPv4 packet sent by the second edge device, decapsulating the IPv4 packet, and obtaining the IPv6 multicast packet, and sending the IPv6 multicast packet to the user.
  • An embodiment of the present invention provides an edge device for forwarding IPv6 multicast packets across an IPv4 network, including:
  • the second edge device receives the IPv4 multicast join request sent by the first edge device, where the IPv4 multicast join request is generated by the first edge device according to the IPv6 multicast join request, and the IPv4 multicast join request carries the group. Broadcast information
  • IPv6 multicast packet Copying the IPv6 multicast packet according to the multicast forwarding entry, and the IPv6 multicast packet is encapsulated into an IPv4 packet, and the IPv4 packet is sent to the first edge device.
  • a further aspect of the embodiments of the present invention provides an edge device, including:
  • a receiver configured to receive an IPv6 multicast join request sent by an IPv6 user, where the IPv6 multicast join request carries the multicast information
  • An obtaining unit configured to acquire an IPv4 address of the second edge device according to the IPv6 multicast join request; a first processor, configured to generate an IPv4 multicast join request according to the IPv6 multicast join request, and send the IPv4 multicast join request to the second edge device, where the IPv4 multicast join request carries the group a second processor, configured to receive an IPv4 packet sent by the second edge device, decapsulate the IPv4 packet, obtain an IPv6 multicast packet, and send the IPv6 multicast packet to The user.
  • a fourth aspect of the embodiments of the present invention provides an edge device, including:
  • a first receiver configured to receive an IPv4 multicast join request sent by the first edge device, where the IPv4 multicast join request is generated by the first edge device according to an IPv6 multicast join request, and the IPv4 multicast join request Carrying multicast information;
  • the first processor is configured to acquire the multicast information in the IPv4 packet, join the multicast group according to the multicast information, and establish a multicast forwarding entry.
  • a second receiver configured to receive an IPv6 multicast packet from the multicast source
  • a second processor configured to: copy the IPv6 multicast packet according to the multicast forwarding entry, and encapsulate the copied IPv6 multicast packet into an IPv4 packet, and send the IPv4 packet to the first An edge device.
  • the first edge device after receiving the IPv6 multicast access request sent by the user, the first edge device encapsulates the IPv6 multicast access request into an IPv4 multicast access request, and sends the request to the second edge device to receive the second
  • the IPv4 packet sent by the edge device decapsulates the IPv4 packet to obtain an IPv6 multicast packet, and sends the IPv6 multicast packet to the user.
  • IPv6 multicast messages can be transmitted across two IPv6 networks across an IPv4 network.
  • FIG. 1 is an application scenario diagram of an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for forwarding an IPv6 multicast packet across an IPv4 network according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of an IPv6 automatic mapping multicast address according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of another method for forwarding IPv6 multicast packets across an IPv4 network according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an edge device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of another edge device according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
  • the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • FIG. 1 it is an application scenario diagram of an embodiment of the present invention.
  • the user for the multicast request to join the multicast group is located in an isolated IPv6 island (called the user island, where the user island 1 and the user island 2 are shown).
  • the multicast source is located in another IPv6 island (called the source island).
  • the user island and the source island are connected to the IPv4 backbone network through their respective edge devices (Provider Edges, PEs).
  • Each edge device PE1-PE3 supports IPv6 and IPv4.
  • the IPv6 island communicates with another IPv6 island through its edge device.
  • PE1 encapsulates the IPv6 multicast join request into an IPv4 multicast join request and sends it to PE2.
  • PE2 is based on PE2.
  • the IPv4 multicast access request establishes a multicast forwarding entry, and establishes a connection with the multicast source, obtains an IPv6 multicast packet from the multicast source, and encapsulates the obtained IPv6 multicast packet into an IPv4 packet and sends the packet to the PE1.
  • the PE1 translates the IPv4 packet into an IPv6 multicast packet and sends it to the user 1. In the above manner, IPv6 multicast packets can be forwarded across IPv4 backbone networks and between IPv6 isolated islands.
  • the method for forwarding an IPv6 multicast packet across an IPv4 network in the embodiment of the present invention includes: 202.
  • the first edge device receives an IPv6 multicast join request sent by an IPv6 user, where the IPv6 multicast join request is received. Carry multicast information.
  • the first edge device is an edge device of the user island, and the multicast information includes multicast source information and multicast group information.
  • the first edge device receives the multicast join request sent by the IPv6 user in the island.
  • the destination address of the multicast join request (that is, the address of the multicast group that the user requests to join) is an IPv6 automatic mapping multicast address, and the IPv6 automatically maps the multicast address to the IPv4 address of the edge device of the source island.
  • the IPv6 automatically mapped multicast address is a special multicast address, and the total length of the address is
  • the first 8 bits are fixed to 11111111, which is used to identify the address as a multicast address, and the 9th to 12th bits are flag fields.
  • the 12th bit is given a clear definition, that is, when the bit is set to 1, it indicates a non-reserved group. Broadcast group.
  • any one of the 9th bit to the 1st bit such as the l ibit, may be used to identify the automatically mapped address. If the flag field is 0011, the IPv6 address is automatically mapped to the non-reserved multicast group. address.
  • the range is the reserved field in the IPv6 address, which is 4 bits in total.
  • the next 80 bits are used to identify the multicast group.
  • the 32b it is an IPv4 address.
  • the multicast source IPv6 address is assumed to be 2001::100, and the multicast source supports two multicast groups G1 and G2, G1 is FF30:0001:: 10.0.0.2, and G2 is FF30: 0002:: 10.0.0.2.
  • the IPv4 address of PE1 of the user island is 20.0.0.2, and the IPv6 address is 2002.20.0.0.2:: 1/64.
  • the source port's PE2 has an IPv4 address of 10.0.0.2 and an IPv6 address of 2002:10.0.0.2:: 1/64.
  • the source address of the IPv6 multicast join request sent by the user is the IPv6 address of the user.
  • the destination address is the multicast group G1: FF30:0001 : : 10.0.0.2, and the specified multicast source address is 2001::100.
  • the first edge device acquires an IPv4 address of the second edge device according to the IPv6 multicast join request.
  • the second edge device is an edge device of the source island.
  • the edge device of the user island After receiving the IPv6 multicast join request sent by the user, the edge device of the user island obtains the destination address of the IPv6 multicast join request, that is, the IPv6 automatically maps the multicast address, and obtains the edge of the source island from the IPv6 automatically mapped multicast address.
  • the IPv4 address of the device, and the IPv4 address of the edge device of the source island is the last 32 bits of the IPv6 automatically mapped multicast address.
  • the edge device of the user island determines whether to obtain the IPv4 address of the source island device from the IPv6 automatically mapped multicast address according to the automatically mapped address flag of the IPv6 automatic mapping multicast address.
  • the auto-mapped address flag of the address is 1, so it is determined that the IPv4 address of the edge device PE2 of the source island needs to be obtained, and The IPv4 address of the PE2 may be further determined to be 10.0.0. 2 ⁇
  • the first edge device sends, to the second edge device, an IPv4 multicast join request that is generated according to the IPv6 multicast join request, where the IPv4 multicast join request carries the multicast information.
  • the first edge device After obtaining the IPv4 address of the second edge device from the IPv6 multicast join request, the first edge device generates an IPv4 multicast join request according to the IPv6 multicast join request, and sends the IPv4 to the second edge device.
  • the multicast join request, the IPv4 multicast join request may be a multicast listener discovery report (MLD, report), and the MLD report carries the multicast information.
  • MLD multicast listener discovery report
  • the source address of the MLD report is 20.0.0.2, and the destination address is 10.0.0.2, wherein the multicast information includes a multicast source 2001::100, and a multicast group FF30:0001:: 10.0.0.
  • the MLD report further includes the IPv6 address of the PE1, which is 2002.20.0.0.2:: 1/64, and the IPv6 address of the PE2, which is the value of the Internet.
  • the IPv4 multicast join request is generated according to the IPv6 multicast join request, and the IPv6 multicast join request may be encapsulated into an IPv4 packet header.
  • PE2 joins the multicast group FF30: 0001:: 10. 0. 0. 2 according to the MLD report, and establishes a multicast forwarding entry corresponding to the MLD report.
  • the PE includes a multicast forwarding table for storing multicast forwarding entries.
  • the multicast forwarding table includes a multicast source, a multicast group, an IPv4 address of the first edge device, an IPv6 address, and an IPv4 address and an IPv6 address of the second edge device.
  • the multicast forwarding table may be Table 1 shows.
  • the second edge device After the multicast forwarding entry is generated, the second edge device establishes a connection with the multicast source, receives the IPv6 multicast packet from the multicast source, and replicates the IPv6 multicast packet according to the multicast forwarding entry.
  • the multicast packet is encapsulated into an IPv4 packet, and then the encapsulated IPv4 packet is sent to the first edge device.
  • the first edge device receives the IPv4 packet sent by the second edge device, decapsulates the IPv4 packet, and obtains the IPv6 multicast packet, and sends the IPv6 multicast packet to the user.
  • the first edge device when the first edge device receives the IPv6 multicast join request sent by the user, the first edge device records the correspondence between the user and the multicast group that the user requests to join, and receives the IPv4 packet sent by the second edge device. Then, the packet is decapsulated to obtain an IPv6 multicast packet, and the IPv6 multicast packet is sent to the user according to the correspondence.
  • another method for forwarding an IPv6 multicast packet across an IPv4 network in the embodiment of the present invention includes:
  • the second edge device receives the IPv4 multicast join request sent by the first edge device, where the IPv4 multicast join request is generated by the first edge device according to the IPv6 multicast join request, where the IPv4 multicast join request is generated. Carry multicast information.
  • the second edge device is an edge device of the source island
  • the first edge device is an edge device of the user island
  • the multicast information includes multicast source information and multicast group information.
  • the second edge device acquires the multicast information in the IPv4 multicast join request, joins the multicast group according to the multicast information, and establishes a multicast forwarding entry.
  • the multicast forwarding entry includes a multicast source, a multicast group, an IPv4 address of the first edge device, and an IPv6 address. And an IPv4 address and an IPv6 address of the second edge device.
  • the second edge device receives an IPv6 multicast packet from a multicast source.
  • the second edge device reproduces the IPv6 multicast packet according to the multicast forwarding entry, and encapsulates the copied IPv6 multicast packet into an IPv4 packet, and sends the IPv4 packet to the first Edge device.
  • FIG. 4 of the present invention further illustrates the embodiment shown in FIG. 2 from the perspective of the second edge device. Therefore, portions not detailed in the embodiment shown in FIG. 4 can be implemented with reference to FIG. 2. Description of the example.
  • the edge device of the user island and the edge device of the source island exchange the IPv6 packets sent by the user and the multicast source into IPv4 packets, and implement the function of forwarding IPv6 multicast packets across the IPv4 network.
  • an embodiment of the present invention provides an edge device for implementing the method shown in FIG. 2, where the edge device includes:
  • the receiver 502 is configured to receive an IPv6 multicast join request sent by an IPv6 multicast request, where the IPv6 multicast join request carries the multicast information.
  • the edge device is an edge device of the user island, and the multicast information includes multicast source information and multicast group information.
  • the destination address of the multicast join request is an IPv6 automatic mapping multicast address. The IPv6 automatically maps the IPv4 address of the edge device including the source island.
  • the obtaining unit 504 is configured to acquire an IPv4 address of the second edge device according to the IPv6 multicast join request.
  • the second edge device is an edge device of the source island.
  • the obtaining unit 504 is specifically configured to obtain the destination address of the IPv6 multicast join request, that is, the IPv6 automatically maps the multicast address, and obtains the IPv4 address of the source island device from the IPv6 automatically mapped multicast address, that is, the destination The last 32 bits of the address are used as the IPv4 address of the second edge device.
  • the first processor 506 is configured to generate an IPv4 multicast join request according to the IPv6 multicast join request, and send the IPv4 multicast join request to the second edge device, where the IPv4 multicast join request carries the Multicast information.
  • the second processor 508 is configured to receive the IPv4 packet sent by the second edge device, decapsulate the IPv4 packet, obtain an IPv6 multicast packet, and send the IPv6 multicast packet to the user.
  • the edge device may further include a recording unit 510, configured to record, after the receiver 502 receives the IPv6 multicast join request, a correspondence between the user and the multicast group that the user requests to join.
  • the second processor 508 is specifically configured to send the IPv6 multicast packet to the user according to the correspondence between the user and the multicast group recorded by the recording unit.
  • an embodiment of the present invention further provides an edge device for implementing the method shown in FIG.
  • the edge device includes:
  • the first receiver 602 is configured to receive an IPv4 multicast join request sent by the first edge device, where the IPv4 multicast join request is generated by the first edge device according to an IPv6 multicast join request, where the IPv4 multicast joins
  • the request carries multicast information.
  • the first processor 604 is configured to obtain the multicast information in the IPv4 packet, join the multicast group according to the multicast information, and establish a multicast forwarding entry.
  • the second receiver 606 is configured to receive an IPv6 multicast packet from the multicast source.
  • the second processor 608 is configured to: copy the IPv6 multicast packet according to the multicast forwarding entry, and encapsulate the copied IPv6 multicast packet into an IPv4 packet, and send the IPv4 packet to the First edge device.
  • the edge device may further include a memory 610 for storing a multicast forwarding item established by the first processor 604.
  • the second processor 608 is specifically configured to obtain the multicast forwarding entry from the memory, and copy the IPv6 multicast packet according to the multicast forwarding item.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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

Abstract

La présente invention se rapporte à un procédé et à un dispositif périphérique adaptés pour réacheminer un message multicast IPv6 dans un réseau IPv4. L'invention appartient au domaine technique des communications. Dans le procédé selon l'invention : un premier dispositif périphérique reçoit une demande d'accès multicast IPv6 envoyée par un utilisateur ; il encapsule la demande d'accès multicast IPv6 dans une demande d'accès multicast IPv4 ; il transmet la demande d'accès multicast IPv4 à un second dispositif périphérique ; il reçoit un message IPv4 envoyé par le second dispositif périphérique ; il désencapsule le message IPv4 de sorte à obtenir un message multicast IPv6 ; et il transmet le message multicast IPv6 à l'utilisateur. La présente invention permet d'exécuter une transmission d'un message multicast IPv6 dans un réseau IPv4, entre deux îles IPv6.
PCT/CN2012/079078 2011-12-06 2012-07-24 Procédé et dispositif périphérique pour réacheminer un message multicast ipv6 dans un réseau ipv4 WO2013082947A1 (fr)

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CN201110400470.3A CN102572007B (zh) 2011-12-06 2011-12-06 跨越IPv4网络转发IPv6组播报文的方法和边缘设备

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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
CN102820977B (zh) * 2012-08-07 2016-05-25 福建星网锐捷网络有限公司 组播方法、装置及网络设备
CN103841037B (zh) * 2012-11-21 2017-12-29 华为技术有限公司 组播报文转发的方法及设备
CN103533100B (zh) * 2013-10-15 2016-09-21 中国联合网络通信集团有限公司 报文传输方法和节点设备
US9584331B2 (en) 2013-10-28 2017-02-28 Pismo Labs Technology Limited Methods and systems for transmitting broadcast data
US10374826B2 (en) 2014-06-30 2019-08-06 Pismo Labs Technology Limited Methods and systems for transmitting broadcast data
CN112787923B (zh) * 2019-11-07 2024-06-21 华为技术有限公司 一种报文的处理方法，装置和系统

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