CN101442422A - Data transmission method, system and device - Google Patents

Data transmission method, system and device Download PDF

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Publication number
CN101442422A
CN101442422A CNA2008101845870A CN200810184587A CN101442422A CN 101442422 A CN101442422 A CN 101442422A CN A2008101845870 A CNA2008101845870 A CN A2008101845870A CN 200810184587 A CN200810184587 A CN 200810184587A CN 101442422 A CN101442422 A CN 101442422A
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China
Prior art keywords
vpn
router
multicast
information
multicast domain
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CNA2008101845870A
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CN101442422B (en
Inventor
陈行
刘毅松
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2008101845870A priority Critical patent/CN101442422B/en
Publication of CN101442422A publication Critical patent/CN101442422A/en
Priority to PCT/CN2009/073010 priority patent/WO2010069174A1/en
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Publication of CN101442422B publication Critical patent/CN101442422B/en
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    • 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
    • H04L12/1886—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with traffic restrictions for efficiency improvement, e.g. involving subnets or subdomains
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]

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

Abstract

The embodiment of the invention discloses a method for transmitting data, a system and a device thereof. The method comprises the following steps: acquiring a rendezvous point RP through competition; transmitting address information of the RP to a route in a multicast domain; and transmitting data to the route in the multicast domain through the RP, so that the route in the multicast domain forwards the data to a target terminal. In the invention, the RP address is acquired through the competition, and multicast data is transmitted through the RP address; and when a new VPN adds to the multicast domain, the new added VPN does not need to reconfigure the RP address information, thereby reducing complexity of configuration.

Description

A kind of transmission method of data, system and device
Technical field
The present invention relates to communication technical field, particularly relate to a kind of transmission method, system and device of data.
Background technology
The IP multicasting technology efficiently solves single-point and sends the problem that multiple spot receives, and has realized the efficient data transmission of IP network mid point to multiple spot, has saved a large amount of network bandwidths and has reduced the load of network.And utilize the multicast feature of network can carry out new value-added service easily, comprise the information service field of the Internets such as online live, Web TV, long-distance education, tele-medicine, network radio station, real-time video meeting.
VPN (Virtual Private Network, VPN (virtual private network)) is the virtual private communication network that Intemet service provider ISP (Internet Service Provider) and Internet Service Provider NSP (Network Service Provider) set up in public network, by using VPN present networks to be resolved into the network of isolating in logic, this network application of isolating in logic is very abundant, comprise and solve the enterprises interconnection, the interdepartmental interconnection of identical or different working, and provide new business (for example, to open up VPN specially for IP telephone service, solution IP network address deficiency, carry out value-added service).
In the prior art, in the networking plan of multicasting VPN Extranet (extranet), source VPN multicast provides the VPN in multicast packet source, the pe router at its place is source PE (Provider Edge, the edge device of service provider network), far-end recipient VPN multicast is the VPN that needs receiving multicast data, with source VPN not on same VPN, the pe router at its place is called recipient PE.When far-end recipient VPN needs the multicast packet of reception sources VPN, need be at the above-mentioned recipient VPN of source VPN side configuration, multicast packet is sent to the recipient VPN of source VPN side configuration at source VPN, and by between the recipient VPN of source VPN side configuration and far-end recipient VPN, carrying out the transmission course of multicast packet, thereby make far-end recipient VPN receive the multicast packet of source VPN.When above-mentioned process of carrying out muticast data transmission is to use PIM-SM (Protocol Independent Multicast-SparseMode, Protocol Independent Multicast-lax pattern) during agreement, need configuration RP (Rendezvous Point, convergent point), so that multicast service normally moves, on the router in PIM (Protocol Independent Multicast, the Protocol Independent Multicast) territory, need configuring static RP, thus static RP address of specifying in the PIM territory.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
In the existing multicasting VPN Extranet networking plan, deployment request to RP is fixed, can only use static RP configuration, can't support dynamic RP configuration, make source VPN and each recipient VPN all need pre-configured static RP address, when initiate recipient VPN, also must be to the identical RP address of recipient VPN configuration that increases, to guarantee the multicast packet of normal reception sources VPN.
Summary of the invention
The embodiment of the invention provides a kind of transmission method, system and device of data, in multicast Extranet, obtaining RP by the mode of competition, and by this RP multicast data forwarding.
In order to achieve the above object, the embodiment of the invention has proposed a kind of transmission method of data, comprising:
Mode by competition is obtained convergent point RP;
The address information of described RP is sent to router in the multicast domain;
Send the data to router in the described multicast domain by described RP, so that the router in the described multicast domain is transmitted described data to the purpose terminal.
The embodiment of the invention has also proposed a kind of transmission system of data, comprising: the router in the router in first VPN (virtual private network) and second VPN (virtual private network), wherein:
Router in described first VPN (virtual private network), be used for obtaining RP by the mode of competition, and the address information of described RP sent to router in the multicast domain, send the data to the router in second VPN (virtual private network) in the described multicast domain by described RP, so that the router in described second VPN (virtual private network) is transmitted described data to the purpose terminal; Router in described first VPN (virtual private network) is a source router, and the router in described second VPN (virtual private network) is a receiving router.
The embodiment of the invention has also proposed a kind of transmitting device of data, comprising:
Acquisition module is used for obtaining RP by the mode of competition;
First sending module is used for address information with described RP and sends to router in the multicast domain;
Second sending module is used for sending the data to router in the described multicast domain by described RP, so that the router in the described multicast domain is transmitted described data to the purpose terminal.
Compared with prior art, the embodiment of the invention has the following advantages:
Obtain the RP address by the mode of using competition, and by this RP address transfer multicast packet, when new VPN joined this multicast domain, this initiate VPN did not need to reconfigure the RP address information, reduced the complexity of configuration.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the transmission method flow chart of a kind of data of the embodiment of the invention one proposition;
Fig. 2 is the embodiment of the invention two transfer of data scene schematic diagrames;
Fig. 3 is the transmission method flow chart of a kind of data of the embodiment of the invention two propositions;
Fig. 4 is the embodiment of the invention three transfer of data scene schematic diagrames;
Fig. 5 is the transmission method flow chart of a kind of data of the embodiment of the invention three propositions;
Fig. 6 is the transmitting device structure chart of a kind of data of the embodiment of the invention four propositions.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The transmission method of a kind of data that the embodiment of the invention one proposes as shown in Figure 1, comprising:
Step S101 obtains convergent point RP by the mode of competition;
Step S102 sends to router in the multicast domain with the address information of described RP;
Step S103 sends the data to router in the described multicast domain by described RP, so that the router in the described multicast domain is transmitted described data to the purpose terminal.
As seen, in the present embodiment, obtain the RP address, and by this RP address transfer multicast packet, when new VPN joined this multicast domain, this initiate VPN did not need to reconfigure the RP address information, reduced the complexity of configuration by the mode of using competition.
The embodiment of the invention two proposes a kind of transmission method of data, in the present embodiment, the transmission method of these data is applied in the networking of multicasting VPN Extranet, with 3 VPN is that example describes, as shown in Figure 2, wherein, VPN 1 is source VPN, VPN 2 is different recipient VPN with VPN 3, the multicast protocol that uses in the territory of each VPN is PIM-SM (Protocol IndependentMulticast-Sparse Mode, Protocol Independent Multicast-lax pattern), wherein, comprise a plurality of routers in this VPN territory, in these a plurality of routers, comprise a pe router, in all embodiment of the present invention, VPN 1, form a multicast domain between VPN 2 and the VPN 3.As shown in Figure 3, the transmission method of these data comprises:
Step S301 sets up multicast Extranet tunnel between the pe router of the pe router of recipient VPN side and source VPN side.
Concrete, in the present embodiment, the pe router of this recipient VPN side is the pe router of different VPN 2 sides and the pe router of VPN 3 sides, the pe router of this source VPN side is the pe router of VPN 1 side.By the multicast Extranet tunnel of this foundation, the pe router of the pe router of VPN 2 sides and VPN 3 sides can get access to multicast packet from the pe router of VPN 1 side.Wherein, comprise a plurality of routers in VPN, promptly VPN is made up of three parts, comprise CE (Customer Edge, user network boundary device), PE (Provider Edge, the edge device of service provider network) and P (Provider, the P in the service provider network).Wherein, have among this CE interface directly and SP (Service Provider, service provider) network be connected, this CE can be router or switch, also can be terminal.This PE directly links to each other with CE, and all processing of VPN are all occurred on the PE.And this P does not directly link to each other with CE, and this P equipment and PE equipment are managed by SP, and CE equipment is by user management, and when the user entrusted to SP with the administrative power of CE equipment, this CE equipment also can be managed by SP.A PE equipment can insert many CE equipment, and a CE equipment also can connect many PE equipment that belong to identical or different service provider.
And multicasting VPN is to support multicast functionality in backbone network (core net or public network), and the multicast packet in the private network is seen through the VPN that public network is delivered to far-end.In the present embodiment, pe router is referred to as to handle the private network multicast packet when handling the multicast packet that moves between the VPN intradomain router, pe router is referred to as to handle the public network multicast packet when handling multicast packet mutual between this VPN and other VPN, wherein, do not need to understand the multicast packet that transmits in the private network when handling the public network multicast packet, do not need to understand the multicast packet that transmits in the public network when handling the private network multicast packet yet, thereby make isolation mutually between each private network multicast.Wherein, to send to the mode of the pe router of VPN far-end be that multicast Extranet tunnel by above-mentioned foundation transmits to the private network multicast packet on the pe router.Promptly when the private network multicast packet is sent to multicast Extranet tunnel interface, multicast protocol message or the multicast data message that sends encapsulated, the message after the encapsulation is the public network multicast data message, sends to public network and transmits in public network.
Step S302 is at source VPN side configuration RP (convergent point).
Concrete, on the router of source VPN side (VPN 1), dispose RP by dynamic RP configuration mechanism.Wherein, this dynamic RP configuration mechanism is specially: selecting router in the territory of VPN 1 arbitrarily, is C-RP (Candidate-RP, candidate's convergent point) with the configuration of routers of selecting, and generation RP is chosen in competition from C-RP.
Above-mentioned competition is chosen the process that produces RP and is specially: by disposing C-BSR (Candidate-BootStrap Router on the optional router in VPN 1, candidate bootstrap router), and competition is chosen and is produced BSR from C-BSR, and this BSR is responsible for collecting and delivery network in C-RP information.When disposing C-BSR on any selection router in VPN1, need point out the priority of interface IP address (this interface IP address is the C-BSR address), Hash mask-length and the C-BSR at this C-BSR place.Become in the process of BSR in the C-BSR competition, during initial the competition, C-BSR on each router all thinks it oneself is BSR, and can send Bootstrap (bootstrapping) message by all routers in VPN 1, in this Bootstrap message, carried the address information of this C-BSR and the precedence information of this C-BSR.When the router in the VPN 1 is received the Bootstrap message of C-BSR transmission, to choose generation BSR according to the address information of the C-BSR that carries in the above-mentioned Bootstrap message and the precedence information competition of this C-BSR, and get access to the pairing address of BSR that generation is chosen in this competition.
Configuration C-RP is the pairing address transmission of BSR Advertisement (broadcasting) message from generation to competition that choose on the router in VPN 1, has carried the precedence information of address information, service groups range information and the C-RP of C-RP in this broadcast.On BSR, gathering above-mentioned information is RP-Set (convergent point configuration) information, this RP-Set information is encapsulated in the Bootstrap message, by Bootstrap message being sent to the all-router in the VPN 1, make that the all-router in the VPN 1 all can be according to the precedence information of C-RP all in this RP-Set information, and calculate and compare by identical rule, get access to the C-RP of the most suitable RP of being, and this C-RP is labeled as RP, the information of this RP includes but not limited to the address information of this RP, service groups range information and precedence information, all-router in the VPN1 is learnt the address information of RP from a plurality of C-RP, it is the address information that VPN 1 interior all-router has all got access to RP, when the router in the VPN 1 need carry out the transmission of multicast packet with VPN 2 or VPN3, address according to RP sends to the pairing router of this RP with multicast packet earlier, the pairing router of this RP sends to the pe router of VPN 1 with this multicast packet then, the pe router of VPN 1 by recipient VPN side pe router and the pe router of source VPN side between the multicast Extranet tunnel set up this multicast packet is sent to the pe router of VPN 2 or VPN 3.
Step S303 sends BSR message by multicast Extranet tunnel.
Concrete, get access to the address information of RP in the inside of VPN 1 after, by BSR message the address information of this RP is sent to router in VPN 2 and the VPN 3, this BSR message is to send to VPN 2 and VPN 3 intradomain router by the multicast Extranet tunnel between the pe router of the pe router of multicast Extranet tunnel between the pe router of the pe router of VPN1 and VPN 2 and VPN 1 and VPN 3.Router in VPN 2 and VPN 3 territories after receiving this BSR message, the RP information of carrying in the study BSR message, and get access to the address of RP.Router in VPN 2 and VPN 3 territories need send to this pairing router in RP address with adding information when VPN 1 sends adding information; And the router in this VPN 1 need also need be transmitted by this pairing router in RP address when the router in VPN 2 and VPN 3 territories sends multicast packet; Same, when new VPN need join VPN 1, also be that new adding information is sent to this pairing router in RP address.
Step S304 sends multicast packet by multicast Extranet tunnel.
Concrete, the multicast packet that all-router in VPN 1 territory will need to transmit sends to the RP in this VPN 1, this RP handles multicast packet, and this transmitting multicast data is given the purpose terminal (router by this purpose terminal place is transmitted) of this multicast packet.The multicast packet that the transmission course of this multicast packet is specially router in VPN 1 territory will be needed to transmit sends to the RP in this VPN 1, this RP gives pe router in this VPN 1 territory according to the adding information that receives VPN with this transmitting multicast data, this pe router sends to the pe router of VPN2 by the multicast Extranet tunnel between VPN 1 and the VPN 2, the pe router of this VPN 2 is after receiving this multicast packet, according to the destination address information in the multicast packet this multicast packet is sent on the purpose router, and this transmitting multicast data is given the purpose terminal of this multicast packet by this purpose router.
In the present embodiment, this RP is deployed on the router in VPN 1 territory, be that pe router need send to BSR message the pe router of VPN 2 sides and the pe router of VPN 3 sides in VPN 1 territory, at this moment, need be in VPN 2 sides in the multicast Extranet tunnel and VPN 3 sides, collocation strategy respectively guarantees that by this configured strategy the BSR message in the pe router of the pe router of VPN 2 sides and VPN 3 sides can not send to the pe router of VPN 1 side by this tunnel.
As seen, in the present embodiment, obtain RP by the mode of using competition, and the address information of RP is sent to router in the multicast domain by Multicast Tunnel, make the router in the multicast domain get access to the RP address by the mode of learning, and according to this RP address transfer multicast packet, when new VPN joins this multicast domain, this initiate VPN does not need to reconfigure the RP address information, has reduced the complexity of configuration.
The embodiment of the invention three proposes a kind of transmission method of data, in the present embodiment, the transmission method of these data is applied in the networking of multicasting VPN Extranet, with 3 VPN is that example describes, as shown in Figure 4, wherein, VPN 1 is source VPN, VPN 2 is different recipient VPN with VPN 3, and the multicast protocol that uses in the territory of each VPN is PIM-SM, wherein, comprise a plurality of routers in this VPN territory, comprise a pe router in these a plurality of routers, and the multicast Extranet tunnel between VPN 1 and the VPN 2, VPN 1 can not transmit BSR message with VPN 3 multicast Extranet tunnels.As shown in Figure 5, the transmission method of these data comprises:
Step S501 sets up multicast Extranet tunnel between the pe router of the pe router of recipient VPN side and source VPN side.
Concrete, in the present embodiment, the pe router of this recipient VPN side is the pe router of different VPN 2 sides and the pe router of VPN 3 sides, the pe router of this source VPN side is the pe router of VPN 1 side.By the multicast Extranet tunnel of this foundation, the pe router of the pe router of VPN 2 sides and VPN 3 sides can get access to multicast packet from the pe router of VPN 1 side.In the present embodiment, can not transmit BSR message with this multicast Extranet tunnel is that example describes.
Step S502 is at recipient VPN side and source VPN side configuration RP.
In the present embodiment, VPN 1 is source VPN, VPN 2 and VPN 3 are recipient VPN, multicast packet in the VPN1 need be transmitted by the RP in the VPN 1, be that RP in the VPN 1 sends to router in the VPN 2 with the multicast packet in the VPN 1 by the multicast Extranet tunnel between VPN 1 and the VPN 2, the RP in the VPN 1 sends to the interior router of VPN 3 with the multicast packet in the VPN 1 by the multicast Extranet tunnel between VPN 1 and the VPN 3.But in the present embodiment, can not pass through multicast Extranet tunnel transmission BSR message, promptly can not give VPN 2 and VPN 3 by the RP address information of BSR transmission of messages VPN 1.At this moment, in the present embodiment by setting up MSDP (Multicast SourceDiscovery Protocol, Multicast Source Discovery Protocol) peer (equity) connection carrying out SA (Source Active, enliven the source) transmission of message, and in SA information, carry the information about multicast source and the RP address information in source (VPN 1).
When using the MSDP agreement, need all dispose RP in all VPN in multicast, promptly need be at VPN 1 side, VPN 2 sides, VPN 3 sides configuration RP, when the needs multicast data transmission, VPN 1 side is that multicast packet is sent to RP in VPN 1 territory, carried out the forwarding of multicast packet then by RP.And the adding information of VPN 2 sides and VPN 3 sides also is the RP that sends to VPN 2 sides and VPN 3 sides respectively.When the RP of VPN 2 sides and VPN 3 sides gets access to SA information, the information about multicast source of the VPN 1 that carries in the SA information is sent to the router of VPN 2 sides and VPN 3 sides, when the router of VPN 2 sides and VPN 3 sides receives multicast packet, can know it is the multicast packet of source VPN 1.Wherein, process at VPN 1 side, VPN 2 sides, VPN 3 sides configuration RP is identical, all adopts dynamic RP configuration mechanism to be configured, in the present embodiment, being that example describes, repeat no more at VPN 2 sides configuration RP with in the process of VPN 3 sides configuration RP at VPN 1 side configuration RP.
Concrete, on the router of source VPN side (VPN 1), dispose RP by dynamic RP configuration mechanism.Wherein, this dynamic RP configuration mechanism is specially: selecting router in the territory of VPN 1 arbitrarily, is C-RP with the configuration of routers of selecting, and generation RP is chosen in competition from C-RP.
Above-mentioned competition is chosen the process that produces RP and is specially: by disposing C-BSR on the optional router among VPN 1, and competition is chosen and is produced BSR from C-BSR, and this BSR is responsible for collecting the C-RP information in the delivery network also.When disposing C-BSR on any selection router in VPN 1, need point out the priority of interface IP address (this interface IP address is the C-BSR address), Hash mask-length and the C-BSR at this C-BSR place.Become in the process of BSR in the C-BSR competition, during initial the competition, C-BSR on each router all thinks it oneself is BSR, and can send Bootstrap message by all routers in VPN1, in this Bootstrap message, carried the address information of this C-BSR and the precedence information of this C-BSR.When the router in the VPN 1 is received the Bootstrap message of C-BSR transmission, to choose generation BSR according to the address information of the C-BSR that carries in the above-mentioned Bootstrap message and the precedence information competition of this C-BSR, and get access to the pairing address of BSR that generation is chosen in this competition.
Configuration C-RP is the pairing address transmission of a BSR Advertisement message from generation to competition that choose on the router in VPN1, has carried the precedence information of address information, service groups range information and the C-RP of C-RP in this broadcast.On BSR, gathering above-mentioned information is RP-Set information, this RP-Set information is encapsulated in the Bootstrap message, by Bootstrap message being sent to the all-router in the VPN 1, make that the all-router in the VPN 1 all can be according to the precedence information of C-RP all in this RP-Set information, and calculate and compare by identical rule, get access to the C-RP of the most suitable RP of being, and this C-RP is labeled as RP, the information of this RP includes but not limited to the address information of this RP, service groups range information and precedence information, all-router in the VPN 1 is learnt the address information of RP from a plurality of C-RP, it is the address information that VPN 1 interior all-router has all got access to RP, when the router in the VPN 1 need carry out the transmission of multicast packet with VPN 2 or VPN 3, address according to RP sends to the pairing router of this RP with multicast packet earlier, the pairing router of this RP sends to the pe router of VPN 1 with this multicast packet then, the pe router of VPN 1 by recipient VPN side pe router and the pe router of source VPN side between the multicast Extranet tunnel set up this multicast packet is sent to the pe router of VPN 2 or VPN 3.
Step S503 sets up MSDP peer and is connected between the RP of the RP of recipient VPN side and source VPN side.
Concrete, in the present embodiment, the multicast Extranet tunnel of above-mentioned foundation can not transmit BSR message, promptly can not transmit the address information of RP, at this moment, need set up MSDP peer and connect message in order to transmission SA, and the address information of in this SA message, carrying information about multicast source and the RP of VPN1.This is set up MSDP peer and connects the MSDP peer be specially between the RP that sets up VPN 1 side RP and VPN 2 sides and be connected, and the MSDP peer between the RP of the RP that sets up VPN 1 side and VPN 3 sides is connected, MSDP peer by this foundation connects, and the pe router of the pe router of recipient VPN 2 sides and VPN 3 sides can receive the SA message from the pe router of VPN 1 side.
When carrying out muticast data transmission between a plurality of VPN in multicast, this multicast packet is to transmit by the multicast Extranet tunnel of setting up, and when this multicast Extranet tunnel can be used to transmit BSR message, VPN in the multicast just can learn the RP address information according to the BSR message that receives, but in the present embodiment, this multicast Extranet can not transmit BSR message in the tunnel, promptly need to set up MSDPpeer and connect transmission SA message, and when using the MSDP agreement, all need safeguard a RP in the territory of each VPN, thereby realize the load sharing of RP, strengthen stability of network.When the router in the territory of each VPN need carry out the transmission of multicast packet, all this multicast packet need be sent to the RP in this VPN territory, this RP transmits this multicast packet.
Step S504 connects transmission SA message by MSDP peer.
Concrete, get access to the address information of RP in the inside of VPN1 after, by SA message the address information of this RP and information about multicast source are sent to router in VPN 2 and the VPN 3, this SA message be the MSDP peer between the pe router of pe router and VPN 2 by VPN 1 be connected and the pe router of the pe router of VPN 1 and VPN 3 between MSDP peer be connected and send to VPN 2 and VPN 3 intradomain router.Router in VPN 2 and VPN 3 territories gets access to information about multicast source from SA message after receiving this SA message.Router in VPN 2 and VPN 3 territories need be when VPN 1 intradomain router sends adding information, is adding information is sent to RP's in this territory.And this VPN 1 intradomain router need be when the router in VPN2 and the VPN3 territory sends multicast packet, also be the RP that needs earlier multicast packet to be sent to VPN 1 territory, RP by VPN 1 territory transmits then, when the router in VPN 2 and VPN 3 receives multicast packet, can get access to the source (VPN 1) of this multicast packet according to information about multicast source.
Step S505 sends multicast packet by multicast Extranet tunnel.
Concrete, the multicast packet that all-router in VPN 1 territory will need to transmit sends to the RP in this VPN 1, this RP handles multicast packet, and this transmitting multicast data is given the purpose terminal (router by this purpose terminal place is transmitted) of this multicast packet.The multicast packet that the transmission course of this multicast packet is specially the router in the VPN1 territory will be needed to transmit sends to the interior RP of this VPN1, this RP gives pe router in this VPN1 territory with this transmitting multicast data, this pe router sends to the pe router of VPN 2 by the multicast Extranet tunnel between VPN1 and the VPN 2, the pe router of this VPN 2 is after receiving this multicast packet, the pe router of VPN 2 sends to this multicast packet the RP of VPN 2, this RP sends to multicast packet on the purpose router according to the adding information of router in the VPN 2, and this transmitting multicast data is given the purpose terminal of this multicast packet by this purpose router.
In the present embodiment, pe router need send to SA message the pe router of VPN 2 sides and the pe router of VPN 3 sides in VPN 1 territory, at this moment, need be in VPN2 side in the multicast Extranet tunnel and VPN 3 sides, collocation strategy respectively guarantees that by this configured strategy the SA message in the pe router of the pe router of VPN 2 sides and VPN 3 sides can not send to the pe router of VPN1 side by this tunnel.
As seen, in the present embodiment, obtain RP by the mode of using competition, and connect address information with RP by MSDP and send to router in the multicast, make the router in the multicast get access to the RP address by the mode of learning, and according to this RP address transfer multicast packet, when new VPN joins this multicast domain, this initiate VPN does not need to reconfigure the RP address information, has reduced the complexity of configuration.And VPN is configured in source and/or receiver side, do not need source VPN side to safeguard the adding information of all receiver side intra-VPN routing devices, reduced load capacity, the use that has also alleviated the bandwidth in multicasting VPN tunnel simultaneously.
The system for transmitting of a kind of data that the embodiment of the invention also proposes, comprise router in first VPN (virtual private network) and the router in second VPN (virtual private network), wherein: the router in this first VPN (virtual private network), be used for obtaining RP by the mode of competition, and the address information of this RP sent to router in the multicast domain, send the data to the router in second VPN (virtual private network) in this multicast domain by this RP, so that the router in this second VPN (virtual private network) is transmitted these data to the purpose terminal.Router in the first above-mentioned VPN (virtual private network) is a source router, and the router in above-mentioned second VPN (virtual private network) is a receiving router.
The device of the transmission of a kind of data that the embodiment of the invention four proposes as shown in Figure 6, comprising:
Acquisition module 61 is used for obtaining RP by the mode of competition;
Set up module 62, be used for the pe router of the source VPN in this multicast domain and receive between the pe router of VPN setting up Multicast Tunnel;
First sending module 63, the address information that is used for RP that acquisition module 61 is obtained sends to the router in the multicast domain;
Second sending module 64 is used for sending the data to router in the multicast domain by the RP that acquisition module 61 obtains, so that the router in this multicast domain is transmitted data to the purpose terminal, these data are to transmit by the Multicast Tunnel of setting up module 62 foundation.
Further, this acquisition module 61 comprises:
Dispensing unit 611 is used for a plurality of routers in the VPN are configured to candidate's convergent point C-RP respectively;
Choose unit 612, be used for the information competition that a plurality of C-RP according to dispensing unit 611 configuration carry and choose RP, the information of carrying among this C-RP comprises one or more in following: the service groups range information of the address information of C-RP, C-RP, the precedence information of C-RP.
Further, this sending module 63 comprises:
First transmitting element 631 is used for by Multicast Tunnel BSR message being sent to router in this multicast domain, so that the router in this multicast domain obtains the RP address according to this BSR message, the address information of carrying this RP in this BSR message;
Second transmitting element 632, be used for connecting SA message is sent to router in this multicast domain by MSDP equity, so that the router in this multicast domain obtains the information about multicast source of RP address and source VPN according to this SA message, carry the address information of this RP and the information about multicast source of source VPN in this SA message.
As seen, in the present embodiment, obtain RP by the mode of using competition, and connect address information with RP by MSDP and send to router in the multicast, make the router in the multicast get access to the RP address by the mode of learning, and according to this RP address transfer multicast packet, when new VPN joins this multicast domain, this initiate VPN does not need to reconfigure the RP address information, has reduced the complexity of configuration.And VPN is configured in source and/or receiver side, do not need source VPN side to safeguard the adding information of all receiver side intra-VPN routing devices, reduced load capacity, the use that has also alleviated the bandwidth in multicasting VPN tunnel simultaneously.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.

Claims (12)

1, a kind of transmission method of data is characterized in that, comprising:
Mode by competition is obtained convergent point RP;
The address information of described RP is sent to router in the multicast domain;
Send the data to router in the described multicast domain by described RP, so that the router in the described multicast domain is transmitted described data to the purpose terminal.
2, the method for claim 1 is characterized in that, the transmission method of described data is applied in the networking of multicasting virtual private network network VPN extranet Extranet.
3, the method for claim 1 is characterized in that, described mode by competition is obtained RP and comprised:
A plurality of routers in the VPN are configured to candidate's convergent point C-RP respectively;
Competition is chosen and is produced RP according to the information of carrying among a plurality of C-RP, and the information of carrying among the described C-RP comprises one or more in following: the service groups range information of the address information of C-RP, C-RP, the precedence information of C-RP.
4, the method for claim 1 is characterized in that, before described address information with RP sends to router in the multicast domain, also comprises:
Set up Multicast Tunnel between the pe router of the pe router of source VPN in described multicast domain and reception VPN.
5, method as claimed in claim 4 is characterized in that, the router that described address information with RP sends in the multicast domain comprises:
By described Multicast Tunnel BootStrap Router BSR message is sent to router in the described multicast domain, so that the router in the described multicast domain obtains the RP address according to described BSR message, the address information of carrying described RP in the described BSR message.
6, the method for claim 1 is characterized in that, before described address information with RP sends to router in the multicast domain, also comprises:
Setting up Multicast Source Discovery Protocol MSDP equity between the RP of source VPN in described multicast domain and the RP that receives VPN is connected.
7, method as claimed in claim 6 is characterized in that, the router that described address information with RP sends in the multicast domain also comprises:
Connect by described MSDP equity and SA message is enlivened in the source sent to router in the described multicast domain, so that the router in the described multicast domain obtains the information about multicast source of RP address and source VPN according to described SA message, carry the address information of described RP and the information about multicast source of source VPN in the described SA message.
8, a kind of transmission system of data is characterized in that, comprising: the router in the router in first VPN (virtual private network) and second VPN (virtual private network), wherein:
Router in described first VPN (virtual private network), be used for obtaining RP by the mode of competition, and the address information of described RP sent to router in the multicast domain, send the data to the router in second VPN (virtual private network) in the described multicast domain by described RP, so that the router in described second VPN (virtual private network) is transmitted described data to the purpose terminal; Router in described first VPN (virtual private network) is a source router, and the router in described second VPN (virtual private network) is a receiving router.
9, a kind of transmitting device of data is characterized in that, comprising:
Acquisition module is used for obtaining RP by the mode of competition;
First sending module is used for address information with described RP and sends to router in the multicast domain;
Second sending module is used for sending the data to router in the described multicast domain by described RP, so that the router in the described multicast domain is transmitted described data to the purpose terminal.
10, device as claimed in claim 9 is characterized in that, described acquisition module comprises:
Dispensing unit is used for a plurality of routers in the VPN are configured to candidate's convergent point C-RP respectively;
Choose the unit, RP is chosen in the information competition that is used for carrying according to a plurality of C-RP, and the information of carrying among the described C-RP comprises one or more in following: the service groups range information of the address information of C-RP, C-RP, the precedence information of C-RP.
11, device as claimed in claim 9 is characterized in that, also comprises:
Set up module, be used for the pe router of the source VPN in described multicast domain and receive between the pe router of VPN setting up Multicast Tunnel.
12, device as claimed in claim 11 is characterized in that, described first sending module comprises:
First transmitting element is used for by described Multicast Tunnel BSR message being sent to router in the described multicast domain, so that the router in the described multicast domain obtains the RP address according to described BSR message, the address information of carrying described RP in the described BSR message;
Second transmitting element, be used for connecting SA message is sent to router in the described multicast domain by MSDP equity, so that the router in the described multicast domain obtains the information about multicast source of RP address and source VPN according to described SA message, carry the address information of described RP and the information about multicast source of source VPN in the described SA message.
CN2008101845870A 2008-12-17 2008-12-17 Data transmission method, system and device Expired - Fee Related CN101442422B (en)

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WO2010069174A1 (en) * 2008-12-17 2010-06-24 华为技术有限公司 A data transmission method, system and equipment
CN101924641A (en) * 2010-08-26 2010-12-22 北京星网锐捷网络技术有限公司 Method, device and system for processing multicast source information
CN102281148A (en) * 2011-08-22 2011-12-14 福建星网锐捷网络有限公司 Method for establishing multicast distribution tree in mode of inter-virtual private network (VPN), equipment and system thereof
CN102299848A (en) * 2011-08-23 2011-12-28 福建星网锐捷网络有限公司 Multicast message transmission method and provider edge device (PE)
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WO2010069174A1 (en) * 2008-12-17 2010-06-24 华为技术有限公司 A data transmission method, system and equipment
CN101924641A (en) * 2010-08-26 2010-12-22 北京星网锐捷网络技术有限公司 Method, device and system for processing multicast source information
CN101924641B (en) * 2010-08-26 2012-12-12 北京星网锐捷网络技术有限公司 Method, device and system for processing multicast source information
CN102281148A (en) * 2011-08-22 2011-12-14 福建星网锐捷网络有限公司 Method for establishing multicast distribution tree in mode of inter-virtual private network (VPN), equipment and system thereof
CN102281148B (en) * 2011-08-22 2014-07-02 福建星网锐捷网络有限公司 Method for establishing multicast distribution tree in mode of inter-virtual private network (VPN), equipment and system thereof
CN102299848A (en) * 2011-08-23 2011-12-28 福建星网锐捷网络有限公司 Multicast message transmission method and provider edge device (PE)
CN102299848B (en) * 2011-08-23 2014-07-02 福建星网锐捷网络有限公司 Multicast message transmission method and provider edge device (PE)
CN104426780A (en) * 2013-08-30 2015-03-18 华为技术有限公司 Data forwarding method and system
CN104426780B (en) * 2013-08-30 2018-01-23 华为技术有限公司 Data forwarding method and system

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