CN102546382A - Method and system for realizing multicast in Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel - Google Patents
Method and system for realizing multicast in Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel Download PDFInfo
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Abstract
The invention provides a method and a system for realizing multicast in an Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel. The method comprises the following steps that: a user side gateway encapsulates an Internet group management protocol (IGMP) multicast group addition request into an IPv6 tunnel for transmission, maps an IPv4 multicast group address into an IPv6 multicast group address, generates a multicast listener discovery (MLD) request message and transmits the MLD request message to a network side; the network side updates an IPv4 multicast tree forwarding table and an IPv6 multicast tree forwarding table; after receiving an IPv4 multicast data packet, the network side maps the IPv4 multicast group address into the IPv6 multicast group address, and downstream forwards an IPv6 multicast data packet obtained by the address mapping; a multicast replication point transmits the multicast-replicated IPv6 multicast data packet to a user side; and after receiving the IPv6 multicast data packet, the user side gateway decapsulates the IPv6 multicast data packet according to a multicast address mapping relationship, recovers the IPv4 multicast data packet and transmits the IPv4 multicast data packet to a user terminal.
Description
Technical field
The present invention relates to the IPv6 networking technology area, especially, relate to a kind of method and system of in the IPv4overIPv6 tunnel, realizing multicast.
Background technology
At present, the IPv4 address has presented situation more and more in short supply, according to distributor gear (Internet Assigned NumberAuthority, IANA) data prediction is used in nearest 3 years address, global ip v4 address resource will exhaust around the end of the year in 2011.In the case, the IPv6 address substitutes the inexorable trend that the IPv4 address has become internet development gradually.But; The incompatibility of IPv6 agreement and IPv4 agreement has also caused the IPv4 application can not move in the IPv6 network stranghtforwardly; Just because of this; Also draw the multiple transitional technology in IPv6 evolution stage, except the ripe relatively double-stack technology of present research, also had the tunneling technique and the translation technology that are suitable for different scenes.
To IPv4 address situation in short supply; Can and provide the network access environment of IPv6 to solve the problem of address shortage for broadband user's distributing IP v6 address; Simultaneously; If continue as IPv6 access user application abundant on the IPv4 network is provided, not only can adopts the tunneling technique of IPv4overIPv6 to realize that IPv4 uses the passing through IPv 6 network, the more typical DS-Lite technology (being working group's draft of IETF at present) that can also adopt.
In the IPv4overIPv6 tunnel, IPv6 datagram header is encapsulated into the header of original IPv4 packet before, thereby can realize the direct transmission of IPv4 packet on the IPv6 network.For the IPv4 unicast data stream, through the equipment at two ends, tunnel: home gateway and network side gateway encapsulate with decapsulation just can realize passing through of packet.But; For original IPv4 multicast packet; Owing in the tunnel, can only see the unicast address at two ends, IPv6 tunnel, can't discern the inner IPv4 multicast group address of encapsulation, also can't use the multicast distribution technology; All IPv4 multicast packets all will transmit through the tunnel as unicast packet, thereby cause the reduction of the bandwidth waste and the transmission efficiency of IPv6 bearer network.
Summary of the invention
The technical problem that the present invention will solve provides a kind of method and system of in the IPv4overIPv6 tunnel, realizing multicast, can make the IPv4 multicast service can in the IPv6 access network, realize the multicast replication function, to improve the transmission efficiency of Internet resources.
According to an aspect of the present invention; A kind of method that in the IPv4overIPv6 tunnel, realizes multicast has been proposed; Comprise that the user side gateway is with Internet Group Management Protocol (The Internet Group Management Protocol; IGMP) the multicast group message that joins request is encapsulated in the IPv6 tunnel and transmits; According to the multicast address mapping relations that are provided with the IGMP multicast group IPv4 multicast group address that carries in the message that joins request is mapped as the IPv6 multicast group address, generates and send multicast listener to network side and find agreement (Multicast Listener Discovery, MLD) request message based on the IPv6 multicast group address; Network side upgrades the IPv4 multicast tree and transmits with the IPv6 multicast tree and transmit according to receiving join request the corresponding interface of message and/or MLD request message of IGMP multicast group; Network side is after receiving the IPv4 multicast packet at the upper reaches; According to the multicast address mapping relations IPv4 multicast group address is mapped as the IPv6 multicast group address, transmits the IPv6 multicast packet after the forwarding address mapping downstream according to the IPv6 multicast tree based on shared tree or based on the mode of the tree in source; Network side multicast replication point duplicates the IPv6 multicast packet that receives, and the IPv6 multicast packet after will duplicating is issued to the user side gateway that the IPv6 multicast tree is transmitted middle request adding multicast group; The user side gateway carries out decapsulation according to the multicast address mapping relations to the IPv6 multicast packet after receiving the IPv6 multicast packet, restore the IPv4 multicast packet and be sent to user terminal.
According to a further aspect in the invention; A kind of system that in the IPv4overIPv6 tunnel, realizes multicast has also been proposed; Comprise network equipment and the user side equipment that links to each other through the tunnel; Wherein, User side equipment is used for the IGMP multicast group message that joins request is encapsulated into the IPv6 tunnel and transmits, according to the multicast address mapping relations that are provided with the join request IPv4 multicast group address that carries in the message of IGMP multicast group is mapped as the IPv6 multicast group address, generates and after network side sends the MLD request message and receiving the IPv6 multicast packet, according to the multicast address mapping relations IPv6 multicast packet is carried out decapsulation to restore the IPv4 multicast packet and to be sent to user terminal based on the IPv6 multicast group address; Network equipment; Be used to receive IGMP multicast group that user side sends join request message and/or MLD request message, according to receive the IGMP multicast group join request the corresponding interface of message and/or MLD request message upgrade the IPv4 multicast tree transmit with the IPv6 multicast tree transmit, after receiving the IPv4 multicast packet at the upper reaches; The IPv4 multicast group address is mapped as the IPv6 multicast group address, transmits the IPv6 multicast packet after the forwarding address mapping downstream according to the IPv6 multicast tree and the IPv6 multicast packet that receives duplicated based on shared tree or based on the mode of the tree in source, and the IPv6 multicast packet after will duplicating be issued to said IPv6 multicast tree transmit in request add the user side equipment of multicast group.
The method and system of in the IPv4overIPv6 tunnel, realizing multicast provided by the invention; Adopting the IPv4overIPv6 tunnel to advance under the scene of IPv6 network evolution; Mapping relations through IPv4 multicast group address and IPv6 multicast group address realize that the IPv4 multicast packet wraps in the transmission in the IPv6 multicast tree; When ensureing that the IPv4 multicast service seamlessly transits, the bandwidth of significantly having saved the IPv6 bearer network has realized more efficiently utilizing the bearer network resource.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of an embodiment of the present invention's method of realizing multicast.
Fig. 2 is the system topological sketch map of an embodiment again of the present invention's method of realizing multicast.
Fig. 3 is the mapping relations sketch map between IPv4 multicast group address and IPv6 multicast group address.
Fig. 4 is the structural representation of an embodiment of the present invention system of realizing multicast.
Fig. 5 is the structural representation of another embodiment of the present invention system of realizing multicast.
Fig. 6 is the structural representation of the another embodiment of the present invention system of realizing multicast.
Embodiment
With reference to the accompanying drawings the present invention is more comprehensively described, exemplary embodiment of the present invention wherein is described.Exemplary embodiment of the present invention and explanation thereof are used to explain the present invention, but do not constitute improper qualification of the present invention.
Below be illustrative to the description only actually of at least one exemplary embodiment, never as any restriction to the present invention and application or use.
Fig. 1 is the schematic flow sheet of an embodiment of the present invention's method of realizing multicast.
As shown in Figure 1, this embodiment can may further comprise the steps:
S102; The user side gateway is encapsulated into the IGMP multicast group message that joins request in the IPv6 tunnel and transmits; According to the multicast address mapping relations that are provided with the IGMP multicast group IPv4 multicast group address that carries in the message that joins request is mapped as the IPv6 multicast group address, generates and send the MLD request message to network side based on the IPv6 multicast group address;
Illustrate; User terminal (for example, STB) is initiated the IGMP multicast group message that joins request to user side gateway (for example, home gateway); Home gateway is after receiving this message; On the one hand the IGMP multicast group message that joins request is encapsulated in the IPv6 tunnel and transmits, home gateway is mapped as the IPv6 multicast group address according to the multicast address mapping relations with the IPv4 multicast group address again according to the IGMP multicast group message extraction IPv4 multicast group address that joins request on the other hand; Automatically generate the MLD request message that this IPv6 multicast group adds, and send the MLD request message to the multicast replication point of network side.
S104, network side upgrades the IPv4 multicast tree and transmits with the IPv6 multicast tree and transmit according to receiving join request the corresponding interface of message and/or MLD request message of IGMP multicast group.
S106; Network side is after receiving the IPv4 multicast packet at the upper reaches; According to the multicast address mapping relations IPv4 multicast group address is mapped as the IPv6 multicast group address, transmits the IPv6 multicast packet after the forwarding address mapping downstream according to the IPv6 multicast tree based on shared tree or based on the mode of the tree in source.
S108; Network side multicast replication point duplicates the IPv6 multicast packet that receives; And the IPv6 multicast packet after will duplicating issues to user side from all of the port of multicast group, that is, be issued to the IPv6 multicast tree transmit in request add the user side gateway of multicast group.
S110, user side gateway carry out decapsulation according to the multicast address mapping relations to the IPv6 multicast packet after receiving the IPv6 multicast packet, restore the IPv4 multicast packet and be sent to user terminal.
This embodiment can promptly, provide the efficient transmission of original IPv4 multicast service in the continuity problem that in the process of IPv6 network evolution, solves original IPv4 multicast application under the IPv4overIPv6 tunnel scene of in the IPv6 network, setting up.In this embodiment; The handling process that is transmitted in IPv4 network or dual-stack network part of original IPv4 multicast packet is constant; And in the IPv6 network; The IPv4 multicast packet can be shared identical multicast duplicating method with the IPv6 multicast packet, has not only saved Internet resources, and keeps the simplification of handling process.
Realize among another embodiment of method of multicast in the present invention; The multicast address mapping relations comprise that multicast identifier field and the Scop field of IPv6 multicast group address that the IPv4 multicast group address is mapped as in the IPv6 multicast group address are set to the multicast address mapped identification; Can the address of IPv4 multicast group be encapsulated into like this in the IPv6 multicast group address, with in the IPv6 transmission through network.
Realize among the another embodiment of method of multicast that in the present invention network side upgrades the IPv4 multicast tree and transmits the step of transmitting with the IPv6 multicast tree and can comprise according to receiving join request the corresponding interface of message and/or MLD request message of IGMP multicast group:
Whether the interface that the network side Broadband Remote Access Server judge to receive the MLD request message is present in during the IPv6 multicast tree transmits; If do not exist; The interface that then will receive the MLD request message join the IPv6 multicast tree transmit in sending the IPv6 multicast packet to this interface, and send Protocol Independent Multicast (Protocol Independent Multicast, PIM) message that joins request to the network side gateway; Wherein, the PIM message bearing IPv6 multicast group address that joins request;
The network side gateway joins request after the message receiving PIM, and Broadband Remote Access Server is added the IPv6PIM neighborhood, and will receive PIM join request the interface of message join the IPv6 multicast tree transmit in to send the IPv6 multicast packet to this interface;
The network side gateway carries out decapsulation to the IGMP multicast group that transmits in the tunnel message that joins request, according to the IGMP multicast group join request the IPv4 multicast group of carrying in the message add message will receive interface that the IPv4 multicast group adds message be updated to the IPv4 multicast tree transmit in to this interface transmission IPv4 multicast packet.
Realize among the embodiment again of method of multicast that in the present invention the step of transmitting the IPv6 multicast packet after the forwarding address mapping downstream according to the IPv6 multicast tree based on the mode of shared tree can comprise:
The network side gateway is as the PIM of shared tree convergent point after IPv4 multicast source server send the to upgrade message that joins request, the message bearing IPv4 multicast group address that joins request of the PIM after the renewal;
The PIM of IPv4 multicast source server after receiving renewal joins request after the message, with receive PIM after upgrading join request the interface of message be updated to the IPv4 multicast tree transmit in and issue the IPv4 multicast packet to this interface;
The network side gateway is mapped as the IPv6 multicast group address according to the multicast address mapping relations with the IPv4 multicast group address after receiving the IPv4 multicast packet, and the IPv6 multicast packet after the mapping of Broadband Remote Access Server forwarding address.
Realize among the embodiment again of method of multicast in the present invention; Network side multicast replication point can be Layer 2 switch, Digital Subscriber Line Access Multiplexer (Digital Subscriber Line Access Multiplexer; DSLAM) or EPON (Passive Optical Network, PON) equipment.
Fig. 2 is the system topological sketch map of an embodiment again of the present invention's method of realizing multicast.
In this embodiment; Use with the IPv4 that is applied as that needs visit at the user side terminal; (Broadband Remote Access Server BRAS) is user's distributing IP v6 address to user access control equipment Broadband Remote Access Server, realizes that user's IPv6 inserts.Between home gateway and network side gateway, set up the IPv4overIPv6 tunnel, realize IPv4 packet passing through through the IPv6 tunnel.With the STB is example, supposes that this user's STB sends the adding application of IPv4 multicast group, and the IPv6 access network is provided at the scheme of discerning and transmit the IPv4 multicast packet in the IPv6 tunnel; Possess and may further comprise the steps; Wherein, the fine dotted line among Fig. 2 is represented IPv4 multicast signaling flow, and thick dashed line is represented IPv6 multicast signaling flow; Fine line is represented the IPv4 group business stream, and heavy line is represented the IPv6 group business stream:
S202, subscriber computer top box (IPv4) is initiated the IGMP multicast group message that joins request to home gateway.
S204; Home gateway (two stack) is supported the expansion of multicast agent (IGMP proxy) function; On the one hand the IGMP multicast group message that joins request is encapsulated in the IPv6 tunnel and transmits; Home gateway is the IPv6 multicast group address with the IPv4 multicast group address of receiving by relationship map shown in Figure 3 on the other hand; And generate automatically the MLD request message that this IPv6 multicast group adds (MLD be used for subscriber's main station and and the multicast router of its direct neighbor between set up, safeguard the multicast member relation, function with realize that principle is all identical with IGMP), and to network side transmission MLD request message;
Wherein, the mapping relations instance of IPv4 multicast group address and IPv6 multicast group address has been shown among Fig. 3, in the IPv6 address, it is following that 128 hytes are broadcast the group address form:
The multicast flag: 8 all is 1;
The Flgs flag: 4, wherein, high 3 is to keep the position, gets 0, and lowest order is the temporary mark position, and value 0 is the well-known multicast address of permanent allocation, and value 1 is the multicast address of non-permanent allocation;
The Scop:4 position identifies the range of application of this IPv6 multicast group, wherein; 3 (0011), 4 (0100), 6 (0110), 7 (0111), 9 (1001)～D (1101) are unallocated; Can choose one of them wantonly and be set to the multicast address mapped identification, for example, can be set to as shown in Figure 39;
The Reserved:80 position, regulation is necessary for complete 0 in RFC2373;
Group ID:32 position, IPv6 multicast identifier number.
In order to realize the mapping one by one of IPv4 multicast group address and IPv6 multicast group address; Scop field of the present invention use unappropriated 9 be used for all IPv4overIPv6 tunnels the multicast mapping address; Address after the IPv4 mapping is as shown in Figure 3, can these mapping relations be stored in home gateway and the network side gateway to carry out the mapping of IPv4 and IPv6 multicast address.
In Fig. 3; Be that 1 multicast flag is represented the IPv6 multicast address entirely; Being the multicast address that 0001 Flgs representes impermanent distribution, is the multicast mapping address in 1001 the Scop IPv4overIPv6 tunnel representing to use, and Group ID is embedded IPv4 multicast address.
S206, edge copy-point (for example, switch, DSLAM or PON) support MLD to monitor (snooping), receive MLD request message (that is, MLD multicast group join request message) and realize the adding of IPv6 multicast group and transmit the MLD request message.
S208, BRAS receives the MLD multicast group and joins request, and judges whether the interface that receives this MLD request message is present in the IPv6 multicast tree (promptly; Multicast group) transmits; Transmit like multicast tree and not write down this interface as yet, then this interface is added to during the IPv6 multicast tree transmits, and send the PIM message (multicast group address is IPv6) that joins request to the network upper reaches; If BRAS has had the record of this interface, then no longer send the PIM message that joins request to the network upper reaches.
S210; The network side gateway is as shared tree convergent point (the Rendezvous Point of IPv6 multicast tree; RP) receive PIM that BRAS sends and join request and BRAS is added the IPv6PIM neighborhood after the message, and, add information to the IPv4 multicast group of carrying in the IGMP message to the IGMP multicast group that encapsulates in the tunnel message decapsulation that joins request; The port that receives is added the IPv4 multicast tree; Set up the IPv4 multicast forward table, and send the PIM message that joins request to network side, the multicast group address in this message is the IPv4 address.
S212; IPv4 multicast source server or IPv4 multicast share tree convergent point RP receive that PIM joins request after the message (multicast group address is IPv4); The interface that receives this message is added multicast tree transmit, and send multicast data flow, arrive the network side gateway through the IPv4 multicast tree to this interface.
S214; The network side gateway is mapped as the IPv6 multicast group address according to address mapping relation with the IPv4 multicast group address, promptly after receiving the IPv4 multicast packet at the upper reaches; Encapsulation IPv6 multicast header is transmitted it as the IPv6 multicast packet after shining upon before IPv4 multicast header.
S216, after the IPv6 multicast packet arrived BRAS, BRAS transmitted the forwarding of carrying out multicast packet based on the IPv6 multicast tree.
S218 for the scene of multicast replication point at switch or DSLAM, when the IPv6 multicast packet arrives multicast replication point, carries out duplicating of IPv6 multicast packet, thereafter all of the port of the multicast packet that duplicates from multicast group is sent.
S220, home gateway receive the IPv6 multicast packet, will encapsulate the packet decapsulation of IPv6 multicast header through the mapping relations of above-mentioned IP v6 multicast group address and IPv4 multicast group address, reduce the IPv4 multicast packet of tunnel internal, and send to STB.
The above embodiment of the present invention does not need in IP network, to increase special equipment; Mapping relations between IPv4 multicast group address and the IPv6 multicast group address at first are set when network design; Secondly terminal device is carried out the conversion process of multicast signaling and packet in the IPv4overIPv6 tunnel: home gateway is mainly accomplished IGMP proxy expanded function, the MLD of the triggering IPv6 multicast group mapping address signaling that joins request; Network side gateway processes IGMP adds signaling setting up the IPv4 multicast forward table, and sends the IPv4PIM signaling message to network side, the IPv6 multicast join message sent of treatments B RAS side simultaneously, set up and BRAS between the IPv6PIM neighborhood.The function of original BRAS, access network equipment, multicast service platform, STB etc. and business processing flow are continued to use original system and are got final product.
Fig. 4 is the structural representation of an embodiment of the present invention system of realizing multicast.
As shown in Figure 4, the system 10 of this embodiment can comprise network equipment 11 and the user side equipment that links to each other through the tunnel 12, wherein,
Network equipment 11; Be used to receive IGMP multicast group that user side sends join request message and/or MLD request message, according to receive the IGMP multicast group join request the corresponding interface of message and/or MLD request message upgrade the IPv4 multicast tree transmit with the IPv6 multicast tree transmit, after receiving the IPv4 multicast packet at the upper reaches; With the IPv4 multicast group address be mapped as the IPv6 multicast group address, based on shared tree or based on the mode of the tree in source after according to the forwarding address mapping downstream of IPv6 multicast tree the IPv6 multicast packet and the IPv6 multicast packet that receives duplicated, and the IPv6 multicast packet after will duplicating be issued to the IPv6 multicast tree transmit in request add the user side equipment of multicast group.
In this embodiment; The IPv4 multicast packet arrives the network side gateway by original multicast tree; The IPv6 multicast packet header of encapsulation mapping relations before IPv4 multicast packet header; By IPv6 multicast distribution mode the IPv4 multicast packet is sent to home gateway, the mode that still sends to STB by the IPv4 multicast packet after the home gateway decapsulation makes the IPv4 multicast application in the IPv6 network, normally to use, and does not influence the transmission efficiency of original IPv4 multicast service.
Fig. 5 is the structural representation of another embodiment of the present invention system of realizing multicast.
As shown in Figure 5, to compare with embodiment among Fig. 4, the user side equipment 21 in the system 20 of this embodiment can comprise the user terminal 211 and user side gateway 212 of interconnection, wherein,
User terminal 211 is used for initiating join request message and receive IPv4 multicast group data bag of IGMP multicast group to the user side gateway;
User side gateway 212 is used for the IGMP multicast group message that joins request is encapsulated into that the IPv6 tunnel transmits and realize the mutual mapping between IPv4 multicast group address and the IPv6 multicast group address according to the multicast address mapping relations.
Fig. 6 is the structural representation of the another embodiment of the present invention system of realizing multicast.
As shown in Figure 6, to compare with embodiment among Fig. 4, the network equipment 31 in the system 30 of this embodiment can comprise multicast replication point 311, Broadband Remote Access Server 312, network side gateway 313 and IPv4 multicast source server 314, wherein,
Multicast replication point 311; Link to each other with user side equipment 12; Be used to receive the MLD request message and the IPv6 multicast packet duplicated, and the IPv6 multicast packet after will duplicating be issued to the IPv6 multicast tree transmit in request add the user side gateway of multicast group;
Broadband Remote Access Server 312; Link to each other with multicast replication point 311, be used for judging whether the interface that receives the MLD request message is present in the IPv6 multicast tree and transmits, if do not exist; The interface that then will receive the MLD request message joins during the IPv6 multicast tree transmits; And send join request message and transmit according to the IPv6 multicast tree and to transmit the IPv6 multicast packet of PIM to the network side gateway, and wherein, the PIM message bearing IPv6 multicast group address that joins request;
Network side gateway 313; Link to each other with Broadband Remote Access Server 312; Be used for receiving PIM join request message, with Broadband Remote Access Server add the IPv6PIM neighborhood, will receive PIM join request the interface of message join the IPv6 multicast tree transmit, to the IGMP multicast group that transmits in the tunnel join request message carry out decapsulation, according to the IGMP multicast group join request the IPv4 multicast group of carrying in the message add message will receive interface that the IPv4 multicast group adds message be updated to the IPv4 multicast tree transmit in, as the PIM of shared tree convergent point after IPv4 multicast source server sends renewal join request message and receiving the IPv4 multicast packet at the upper reaches after according to the multicast address mapping relations IPv4 multicast group address is mapped as the IPv6 multicast group address; And the IPv6 multicast packet after the mapping of Broadband Remote Access Server forwarding address; Wherein, the message bearing IPv4 multicast group address that joins request of the PIM after the renewal;
IPv4 multicast source server 314; Link to each other with network side gateway 313; Be used to receive PIM after the renewal message that joins request, with receive PIM after upgrading join request the interface of message be updated to the IPv4 multicast tree transmit in and issue the IPv4 multicast packet to this interface.
Realize among the embodiment again of system of multicast in the present invention; The multicast address mapping relations comprise that multicast identifier field and the Scop field of IPv6 multicast group address that the IPv4 multicast group address is mapped as in the IPv6 multicast group address are set to the multicast address mapped identification; Wherein, instantiation can be referring to above-mentioned Fig. 3.
Realize that in the present invention the multicast replication point can be Layer 2 switch, DSLAM or PON equipment among the embodiment again of system of multicast.
The instantiation of system embodiment of the present invention can just no longer repeat at this referring to the instantiation of preceding method.
In addition, the above embodiment of the present invention not only is directed against the DS-Lite tunneling technique, but also can be directed against IPv4overIPv6 class tunneling technique, thereby makes the foregoing description have applicability widely.
The above embodiment of the present invention has following beneficial effect:
(1) can realize effective transmission of multicast packet in the main scene (for example, in the IPv4overIPv6 tunneling technique scheme) of IPv6 network transition;
(2) because multicast packet wraps in when transmitting in the clean culture tunnel, and the multicast replication point can only be positioned at the network side gateway, descending multicast packet can only duplicate (promptly by the unicast stream mode; Multicast replication point is at the network side gateway); And the present invention can realize moving down of multicast replication point when in the IPv6 network, carrying the IPv4 multicast service, that is, can with the multicast replication point move down into support MLDSnooping the edge copy-point (for example; Layer 2 switch, DSLAM, perhaps PON equipment);
(3) owing between network side gateway and user side gateway, can only use IPv6 clean culture tunnel style to propagate flux of multicast originally; Promptly; To each multicast user 1 Media Stream can be arranged all,, no matter in the multicast group how many users arranged if adopt mode of the present invention; Between network side gateway and multicast replication point, have only 1 Media Stream, thus can improve that newly-increased IPv6 converges, in the access network for the transmission efficiency of multicast service, reduce bandwidth demand to bearer network;
(4) the present invention does not influence the flow process of existing IPv4 multicast service, does not influence the function and the performance requirement of the existing STB of user, multicast service platform;
(5) the present invention need not increase specific equipment, on the basis of original IPv4overIPv6 home gateway and network side gateway, improves getting final product, and is workable.
Though specific embodiments more of the present invention are specified through example, it should be appreciated by those skilled in the art that above example only is in order to describe, rather than in order to limit scope of the present invention.It should be appreciated by those skilled in the art, can under situation about not departing from the scope of the present invention with spirit, above embodiment be made amendment.Scope of the present invention is limited accompanying claims.
Claims (10)
1. a method that in the IPv4overIPv6 tunnel, realizes multicast is characterized in that, comprising:
The user side gateway is encapsulated into the IGMP multicast group message that joins request in the IPv6 tunnel and transmits; According to the multicast address mapping relations that are provided with the said IGMP multicast group IPv4 multicast group address that carries in the message that joins request is mapped as the IPv6 multicast group address, generates and send the MLD request message to network side based on said IPv6 multicast group address;
Network side upgrades the IPv4 multicast tree and transmits with the IPv6 multicast tree and transmit according to receiving join request the corresponding interface of message and/or MLD request message of said IGMP multicast group;
Network side is after receiving the IPv4 multicast packet at the upper reaches; According to said multicast address mapping relations the IPv4 multicast group address is mapped as the IPv6 multicast group address, transmits the IPv6 multicast packet after the forwarding address mapping downstream according to said IPv6 multicast tree based on shared tree or based on the mode of the tree in source;
Network side multicast replication point duplicates the IPv6 multicast packet that receives, and the IPv6 multicast packet after will duplicating is issued to the user side gateway that said IPv6 multicast tree is transmitted middle request adding multicast group;
The user side gateway carries out decapsulation according to said multicast address mapping relations to the IPv6 multicast packet after receiving the IPv6 multicast packet, restore the IPv4 multicast packet and be sent to user terminal.
2. method according to claim 1; It is characterized in that said multicast address mapping relations comprise that multicast identifier field and the Scop field of said IPv6 multicast group address that the IPv4 multicast group address is mapped as in the IPv6 multicast group address are set to the multicast address mapped identification.
3. method according to claim 1 is characterized in that, said network side upgrades the IPv4 multicast tree and transmits the step of transmitting with the IPv6 multicast tree and comprise according to receiving join request the corresponding interface of message and/or MLD request message of said IGMP multicast group:
Whether the interface that the network side Broadband Remote Access Server judge to receive said MLD request message is present in during said IPv6 multicast tree transmits; If do not exist; The interface that then will receive said MLD request message joins during said IPv6 multicast tree transmits; And sending the PIM message that joins request to the network side gateway, said PIM joins request and carries the IPv6 multicast group address in the message;
Said network side gateway joins request after the message receiving said PIM, and said Broadband Remote Access Server is added the IPv6PIM neighborhood, and will receive the join request interface of message of said PIM and join during said IPv6 multicast tree transmits;
Said network side gateway carries out decapsulation to the IGMP multicast group that transmits in the tunnel message that joins request, and adds interface that message will receive IPv4 multicast group adding message and is updated to during said IPv4 multicast tree transmits according to the join request IPv4 multicast group of carrying in the message of IGMP multicast group.
4. method according to claim 3 is characterized in that, the step that said mode based on shared tree is transmitted the IPv6 multicast packet after the forwarding address mapping downstream according to said IPv6 multicast tree comprises:
Said network side gateway is as the PIM of shared tree convergent point after IPv4 multicast source server send the to upgrade message that joins request, the message bearing IPv4 multicast group address that joins request of the PIM after the said renewal;
The PIM of said IPv4 multicast source server after receiving renewal joins request after the message, with receive PIM after upgrading join request the interface of message be updated to said IPv4 multicast tree transmit in and issue the IPv4 multicast packet to this interface;
Said network side gateway is after receiving said IPv4 multicast packet; According to said multicast address mapping relations the IPv4 multicast group address is mapped as the IPv6 multicast group address, and the IPv6 multicast packet after said Broadband Remote Access Server forwarding address mapping.
5. method according to claim 1 is characterized in that, said network side multicast replication point is Layer 2 switch, DSLAM or PON equipment.
6. a system that in the IPv4overIPv6 tunnel, realizes multicast is characterized in that, comprises network equipment and the user side equipment that links to each other through the tunnel, wherein,
Said user side equipment is used for the IGMP multicast group message that joins request is encapsulated into the IPv6 tunnel and transmits, according to the multicast address mapping relations that are provided with the join request IPv4 multicast group address that carries in the message of said IGMP multicast group is mapped as the IPv6 multicast group address, generates and after network side sends the MLD request message and receiving the IPv6 multicast packet, according to said multicast address mapping relations the IPv6 multicast packet is carried out decapsulation to restore the IPv4 multicast packet and to be sent to user terminal based on said IPv6 multicast group address;
Said network equipment; Be used to receive IGMP multicast group that user side sends join request message and/or MLD request message, according to receive said IGMP multicast group join request the corresponding interface of message and/or MLD request message upgrade the IPv4 multicast tree transmit with the IPv6 multicast tree transmit, after receiving the IPv4 multicast packet at the upper reaches; The IPv4 multicast group address is mapped as the IPv6 multicast group address, transmits the IPv6 multicast packet after the forwarding address mapping downstream according to said IPv6 multicast tree and the IPv6 multicast packet that receives duplicated based on shared tree or based on the mode of the tree in source, and the IPv6 multicast packet after will duplicating be issued to said IPv6 multicast tree transmit in request add the user side equipment of multicast group.
7. system according to claim 6 is characterized in that, said user side equipment comprises the user terminal and the user side gateway of interconnection, wherein,
Said user terminal is used for initiating join request message and receive IPv4 multicast group data bag of said IGMP multicast group to said user side gateway;
Said user side gateway is used for the said IGMP multicast group message that joins request is encapsulated into that the IPv6 tunnel transmits and realize the mutual mapping between IPv4 multicast group address and the IPv6 multicast group address according to said multicast address mapping relations.
8. system according to claim 6 is characterized in that, said network equipment comprises multicast replication point, Broadband Remote Access Server, network side gateway and IPv4 multicast source server, wherein,
Said multicast replication point; Link to each other with said user side equipment; Be used to receive said MLD request message and the IPv6 multicast packet duplicated, and the IPv6 multicast packet after will duplicating be issued to said IPv6 multicast tree transmit in request add the user side gateway of multicast group;
Said Broadband Remote Access Server; Link to each other with said multicast replication point; Be used for judging whether the interface that receives said MLD request message is present in the IPv6 multicast tree and transmits; If do not exist, the interface that then will receive said MLD request message joins during said IPv6 multicast tree transmits, and sends join request message and transmit according to said IPv6 multicast tree and to transmit the IPv6 multicast packet of PIM to said network side gateway; Wherein, the said PIM message bearing IPv6 multicast group address that joins request;
Said network side gateway; Link to each other with said Broadband Remote Access Server; Be used for receiving said PIM join request message, with said Broadband Remote Access Server add the IPv6PIM neighborhood, will receive said PIM join request the interface of message join said IPv6 multicast tree transmit, to the IGMP multicast group that transmits in the tunnel join request message carry out decapsulation, according to the IGMP multicast group join request the IPv4 multicast group of carrying in the message add message will receive interface that the IPv4 multicast group adds message be updated to said IPv4 multicast tree transmit in, as the shared tree convergent point to the PIM after the IPv4 multicast source server transmission renewal join request message and receiving the said IPv4 multicast packet at the upper reaches after according to said multicast address mapping relations the IPv4 multicast group address is mapped as the IPv6 multicast group address; And the IPv6 multicast packet after said Broadband Remote Access Server forwarding address mapping; Wherein, the message bearing IPv4 multicast group address that joins request of the PIM after the said renewal;
Said IPv4 multicast source server; Link to each other with said network side gateway; Be used to receive PIM after the renewal message that joins request, with receive PIM after upgrading join request the interface of message be updated to said IPv4 multicast tree transmit in and issue the IPv4 multicast packet to this interface.
9. system according to claim 6; It is characterized in that said multicast address mapping relations comprise that multicast identifier field and the Scop field of said IPv6 multicast group address that the IPv4 multicast group address is mapped as in the IPv6 multicast group address are set to the multicast address mapped identification.
10. system according to claim 8 is characterized in that, said multicast replication point is Layer 2 switch, DSLAM or PON equipment.
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