CN103095473A - Method, device and network equipment of assigned information source multicast across virtual private network (VPN) - Google Patents
Method, device and network equipment of assigned information source multicast across virtual private network (VPN) Download PDFInfo
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Abstract
The invention discloses a method, a device and network equipment of assigned information source multicast across a virtual private network (VPN). According to the method, a provider edge router (PE) establishes a backup multicast table of a main multicast table of a communication edge (CE), and in the process of the switchover between a version 3 of an internet group management protocol (IGMPv3) and a version 2 of the IGMP (IGMPv2), the PE carries out multicast transmission across the VPN according to multicast source addresses in the backup multicast table under the condition that multicast source address information of the main multicast table and the backup multicast table is inconsistent, and carries out multicast transmission across the VPN according to multicast source address information in the main multicast table under the condition that the multicast source address information of the main multicast table and the backup multicast table is consistent. The backup multicast table can be used as a reliable and effective reference basis to achieve the multicast transmission of the assigned information source multicast across VPN for the CE, and the problem that in the prior art, when the PE carries out the switchover between the IGMPv3 and the IGMPv2, and the cutoff of the assigned information source multicast across the VPN for the CE is caused is solved.
Description
Technical field
The present invention relates to the network communications technology, particularly, relate to a kind of source-specific multicast method, device and network equipment of crossing virtual private networks network.
Background technology
Based on multiprotocol label switching (Multi-Protocol Label Switching, MPLS) VPN (virtual private network) (Virtual Private Network, VPN) the 3rd layer (L3VPN) be the service provider provide a kind of based on edge router (Provider Edge Router, PE) VPN technologies, it uses Border Gateway Protocol (Border Gateway Protocol, BGP) at service provider (Service Provider, SP) on backbone network, issue VPN route, use the MPLS technology to forward the VPN message on the SP backbone network.And multicasting VPN is a kind of technology based on multicast packet in MPLS L3VPN Internet communication VPN, its network basic model as shown in Figure 1:
Communication terminal (Communication Edge, CE) is positioned at the equipment of customer network edge, belongs in logic user's VPN, and certain interface of CE directly is connected with the PE of operator of SP, and CE can be that main frame can be also router or switch; CE1 belongs to VPN1 in Fig. 1, and CE2 belongs to VPN2, and CE1 is connected with PE1 with CE2 and is connected, and CE3 belongs to VPN1, and CE4 belongs to VPN2, and CE3 is connected with PE2 with CE4 and is connected, and the upper interface that is connected with CE of PE can be called the private network interface.
PE is the edge device of the backbone network that provides of SP, and PE1 and PE2, belong to SP on the PE apparatus logic as shown in fig. 1, and PE and CE are direct-connected, and a PE can connect a plurality of CE that belong to similar and different VPN.
Vendor equipment (Provider Router, P) is positioned at the nucleus equipment of SP backbone network.P discord CE is connected, and is responsible for route and the fast-forwarding of public network.
Network topology in Fig. 1, in VPN, the operation multicast protocol builds the Multicast Routing in VPN and is VPN forwarding multicasting stream; When PE1 receives the multicast data flow that CE1 and CE2 arrive, convert thereof into the multicast packet form that public network can propagate and propagate in public network, make on its PE2 that propagates into other VPN website of connection; When PE2 receives the public network multicast packet with its decapsulation and be forwarded in corresponding VPN website.
And be expansion to above-mentioned technology across the VPN multicast, namely the expanded application of multicasting VPN (being called for short Extranet-MVPN) makes multicast source in a multicasting VPN multicast data flow can be distributed to the multicast receiving terminal of other multicasting VPN.Namely in topological structure shown in Figure 1, multicast source and multicast receiving terminal may reside in VPN1 and VPN2, by PE1 equipment across the VPN multicast functionality, can realize the program request between different VPN.
The multicast receiving terminal has sparse mode independent multicast agreement (Protocol Independent Multicast-Sparse Mode when VPN accesses, PIM-SM) and source-specific multicast (Protocol Independent Multicast-Source-Specific Multicast, PIM-SSM) dual mode access.Wherein the PIM-SSM access way is the multicast mode of assigned source, needs to realize by this (IGMPv3) agreement of operation the Internet multicast member management protocol (Internet Group Management Protocol, the IGMP) third edition between CE and PE.
When using IGMPv3 and realize that source-specific multicast across VPN forwards, exist a PE to carry out the v2/v3 handover operation to igmp version, cause the problem across the interruption of VPN multicast data flow, be a minute rank break period, this problem is that application IGMPv3 and PIM-SSM realize across a leak in the multicast forwarding technology of VPN, and detailed process is as follows:
scene as shown in Figure 1, if the multicast receiving terminal is CE1, multicast source is CE2, the CE2 address is A, PE1, all move the IGMPv3 agreement on CE1 and CE2 main frame and carry out multicast on demand across VPN, for example belong to VPN1 the CE1 program request belong to the flux of multicast of the CE2 of VPN2, CE2 is multicast source, CE1 is the multicast receiving terminal, use the protocol massages of IGMPv3 to inquire that namely (Query) message and report (Report) message communicate between PE1 and CE1, whether PE1 regularly sends the inquiry of Query message under normal circumstances has the multicast receiving terminal to exist, CE1 replys the existence of Report message announcement multicast receivers, PE1 generates and safeguards multicast member relation and multicast forwarding list item according to the Report message of receiving, include the sign of multicast group of flux of multicast of CE1 program request and the address information of multicast source in the multicast forwarding list item.
When PE1 is upper, igmp version is carried out the v2/v3 handover operation, version is designated hereinafter simply as the v3 version from IGMPv3() switch to IGMPv2(and be designated hereinafter simply as the v2 version), switch back again IGMPv3, PE1 will send the Query message of v2 version and the Query message of v3 version at short notice, CE1 equipment will be received the Query message of v2 version and the Query message of v3 version at short notice, and following processing procedure occurs:
After step 1, PE1 switch to IGMPv2 from IGMPv3, CE1 equipment is first received the Query from the v2 version of PE1, that this moment, CE1 upward moved is IGMPv3, according to IGMPv3 protocol processes flow process, the compatible mechanism of startup to the IGMPv2 version, can set the inquiry timer of a compatible v2 version on CE1 equipment, time is 255 seconds, within this 255 second time no matter receive v2 version or the Query message of v3 version, CE1 replys the Report message of v2 version, and in 255 seconds of timing, CE1 sent the Report message of v2 version to PE1 every 60 seconds;
step 2, reply the Report message of v2 version due to CE1, after PE1 equipment is received, think the multicast receivers that has the v2 version, start the compatible mechanism to the v2 version, PE1 receives that often the Report message of a v2 just generates one corresponding to the timer of v2 version, time is 250 seconds, and generate the exclude(NULL of this multicast member CE1 in IGMP multicast member table) information table, this list item represents that PE goes up the flow that the recipient that multicast is arranged in the CE that connects need to receive this multicast group, exclude(NULL) expression CE can receive the flux of multicast that any multicast source sends.
but owing in this scene environment being the VPN access of using SSM, multicast data flow needs according to shortest path tree (Shortest Path Tree, SPT) carry out multicast forwarding, namely take multicast source S as root node, the recipient is the multicast transmit tree of leaf node, flux of multicast is directly walked the shortest path from the multicast source to the multicast receivers, PE must know according to SPT the place of the multicast source of appointment when specifying the flux of multicast of information source to forward, but PE1 does not form list item with source address for the multicast forwarding list item of CE1, only have exclude(NULL) list item, cause PE1 not know what the multicast source address of CE1 appointment is, can't form SPT to CE1, also just can't carry out to CE1 the forwarding of flux of multicast, cause the upper cutout of CE1, this process will continue about 255 seconds.
3, after CE1 timing 255 seconds then, CE1 equipment stops sending to PE1 the Report message of v2 version, and after the Query message of receiving the v3 version that PE1 sends, CE1 changes the Report message of replying the v3 version into.after PE1 receives this v3 version Report message, EXCLUDE(NULL due to the CE1 that forms before existing) list item, according to the IGMPv3 agreement, the particular content of this group membership's information table will be changed to EXCLUDE(A), A represents that the IP address in certain specific multicast source is the IP address of CE2, at this moment the multicast member information table is EXCLUDE(A), it is the multicast data flow that the CE2 multicast source sends that the expression eliminating does not namely receive this source address A, causing at this moment, CE2 will still can't get through across the VPN multicast data flow to CE1, this process will continue about 250 seconds, be also that PE1 received the Report message of last v2 version that CE sends and timing 250 seconds in timing 255 seconds.
4, PE1 is after for the Report message timing of last v2 version 250 seconds then, according to the IGMPv3 agreement, PE1 will can be from EXCLUDE(A for the multicast member information table of CE1) be rewritten as INCLUDE(A), expression PE1 should be that the flux of multicast of A is transmitted to CE1 with the assigned address that receives, at this moment, PE1 equipment could and generate SPT for CE1, just can get through across the VPN multicast data flow, and the cutout time probably continues 255+250 second.
As seen in the existing source-specific multicast forwarding that realizes by IGMPv3 across VPN, when existing PE that IGMPv2 and the switching of IGMPv3 version occur, cause the problem across the source-specific multicast cutout of VPN.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of source-specific multicast Fang method, Zhuan Ge and network equipment across VPN, existingly realize forwarding across the source-specific multicast of VPN by IGMPv3 in order to solve, when existing PE that IGMPv2 and the switching of IGMPv3 version occur, the problem that the source-specific multicast across VPN that causes stops.
Embodiment of the present invention technical scheme is as follows:
the source-specific multicast method of crossing virtual private networks network VPN a kind of, comprise: provider edge router PE is detecting operation the Internet this IGMPv3 of the multicast member management protocol third edition on definite described PE, and detect and determine that the communication terminal CE that belongs in VPN that is connected with described PE upward moves in the situation of IGMPv3 and source-specific multicast pattern, the main multicast table that basis is set up from the report message of the IGMPv3 version of described CE backs up, include the multicast source address information across the flux of multicast of VPN of described CE program request in multicast table in described main multicast table and backup, described PE is in the process of carrying out IGMPv3 and IGMPv2 switching, in the situation that the multicast source address information inconsistency in described main multicast table and described backup multicast table, according to the multicast source address information in described backup multicast table, described CE is carried out multicast forwarding across VPN.
the source-specific multicast Zhuan Ge of a kind of crossing virtual private networks network VPN, comprise: backup module, be used for detecting at described dress Ge place PE and determine operation the Internet this IGMPv3 of the multicast member management protocol third edition on described PE, and detect and determine that the communication terminal CE that belongs in VPN that is connected with described PE upward moves in the situation of IGMPv3 and source-specific multicast pattern, the main multicast table that described PE basis is set up from the report message of the IGMPv3 version of described CE backs up, include the multicast source address information across the flux of multicast of VPN of described CE program request in multicast table in described main multicast table and backup, forwarding module, be used for carrying out at described Zhuan Ge place PE the process of IGMPv3 and IGMPv2 switching, in the situation that the multicast source address information inconsistency in described main multicast table and described backup multicast table, according to the multicast source address information in described backup multicast table, described CE is carried out multicast forwarding across VPN.
A kind of network equipment comprises the source-specific multicast Zhuan Ge of crossing virtual private networks network as above.
technical scheme according to the embodiment of the present invention, PE sets up the backup multicast table of the main multicast table of CE, carry out in the different phase of IGMPv3 and IGMPv2 switching at PE, PE can modify to the content in the multicast source address item in main multicast table, but can not modify to the multicast table of backup, PE is in the process of carrying out IGMPv3 and IGMPv2 switching like this, in the situation that the multicast source address information inconsistency in main multicast table and backup multicast table, carry out multicast forwarding across VPN according to the multicast source address of backup in multicast table, can be take the backup multicast table as reliable and effective reference frame, carry out in the process of IGMPv3 and IGMPv2 switching at PE, realization is carried out multicast forwarding across VPN to CE, can solve in prior art at PE when the v2 that IGMP occurs and v3 version switch, forward according to the main multicast table of continuous modification, cause the problem across the source-specific multicast of VPN cutout to CE.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Description of drawings
Fig. 1 is across the scene schematic diagram of VPN multicast forwarding in prior art;
The workflow across the source-specific multicast method of VPN that Fig. 2 provides for the embodiment of the present invention;
The structured flowchart across the source-specific multicast Zhuan Ge of VPN that Fig. 3 provides for the embodiment of the present invention;
Another structured flowchart across the source-specific multicast Zhuan Ge of VPN that Fig. 4 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described, should be appreciated that embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
Realize forwarding across the source-specific multicast of VPN by IGMPv3 for existing, when existing PE that IGMPv2 and the switching of IGMPv3 version occur, cause the problem across the source-specific multicast cutout of VPN, the embodiment of the present invention provides a kind of source-specific multicast scheme across VPN, to address this problem.in the technical scheme that the embodiment of the present invention provides, provide a kind of back mechanism and a kind of easily table forwarding mechanism of selecting a good opportunity of main multicast table, according to back mechanism, PE sets up the backup multicast table of the main multicast table of CE, according to the easily table forwarding mechanism of selecting a good opportunity, carry out in the different phase of IGMPv3 and IGMPv2 switching at PE, PE can modify to the content in the multicast source address item in main multicast table, but can not modify to the multicast table of backup, PE is in the process of carrying out IGMPv3 and IGMPv2 switching like this, in the situation that the multicast source address information inconsistency in main multicast table and backup multicast table, carry out multicast forwarding across VPN according to the multicast source address of backup in multicast table, in the situation that main multicast table is consistent with the multicast source address information of backup in multicast table, carry out multicast forwarding across VPN according to the multicast source address information in main multicast table, can be take the backup multicast table as reliable and effective reference frame, carry out in the process of IGMPv3 and IGMPv2 switching at PE, realization is carried out multicast forwarding across VPN to CE, can solve in prior art when PE the v2 of IGMP and v3 version occur switches, forward according to the main multicast table of continuous modification, cause the problem across the source-specific multicast of VPN cutout to CE.
The below is elaborated to the embodiment of the present invention.
The workflow across the source-specific multicast method of VPN that Fig. 2 shows that the embodiment of the present invention provides comprises:
Step 201, PE determine to move IGMPv3 on described PE in detection, and detect and determine that the CE that belongs in VPN that is connected with described PE upward moves in the situation of IGMPv3 and SSM, to backing up according to the main multicast table of setting up from the report message of the IGMPv3 version of CE, include the multicast source address information across the flux of multicast of VPN of CE program request in main multicast table and backup multicast table;
Particularly, main multicast table and backup can also comprise the multicast sign across the flux of multicast of VPN of CE program request in multicast table;
Further, PE can also add CE in the backup multicast table address information, address information can be that (MAC, Media Access Control) address is controlled in Internet protocol (IP, Internet Protocol) address and the media interviews of CE;
By above-mentioned back mechanism, can provide for follow-up repeating process correct, reliable and effective multicast source address information;
Step 202, PE are in carrying out the process that IGMPv3 and IGMPv2 switch, in the situation that the multicast source address information inconsistency in main multicast table and backup multicast table, according to the multicast source address information in the backup multicast table, CE are carried out multicast forwarding across VPN;
particularly, after PE switches to IGMPv2 from IGMPv3, PE sends the inquiry message (Query) of IGMPv2 to CE, CE starts the compatible mechanism to IGMPv2, CE sets the inquiry timer of a compatible IGMPv2, time is 255 seconds, and in 255 seconds of timing, CE sent the report message (Report) of IGMPv2 to PE every 60 seconds, PE receives the report message of the IGMPv2 that CE replys, start the compatible mechanism to the IGMPv2 version, PE receives that often the report message of an IGMPv2 just generates one corresponding to the timer of v2 version, time is 250 seconds, and the multicast source address information table of this CE in main multicast table is rewritten as exclude(NULL), namely do not forward to CE the flux of multicast that the equipment of any multicast source address sends, at this moment in main multicast table and backup multicast table, the multicast source address information inconsistency of CE, if forward according to the multicast source address information in master meter this moment, can't forward any flux of multicast to CE,
carry out compatible timing after 255 seconds at CE for IGMPv2, CE stops sending to PE the report message of IGMPv2, after the inquiry message of receiving the IGMPv3 that PE sends, CE changes the report message of replying IGMPv3 into, after PE receives the report message of this IGMPv3, exclude(NULL due to the CE that forms before existing) list item, according to the IGMPv3 agreement, the multicast source address information of CE is changed to exclude(A), A represents the IP address in certain specific multicast source, expression does not forward to CE the flux of multicast that this source address A sends, at this moment in main multicast table and backup multicast table, the multicast source address information inconsistency of CE, if forward according to the multicast source address information in master meter this moment, can't forward any flux of multicast to CE,
Therefore, in the situation that PE receives from the report message of the IGMPv2 of described CE and the multicast source address information inconsistency in main multicast table and backup multicast table, perhaps in the situation that PE receives from the report message of the IGMPv3 of CE and the multicast source address information inconsistency in main multicast table and backup multicast table, according to the multicast source address information in the backup multicast table, CE is carried out multicast forwarding across VPN;
PE is after for the report message timing of last IGMPv2 250 seconds then, according to the IGMPv3 agreement, PE will can be from EXCLUDE(A for the multicast member information table of CE) be rewritten as INCLUDE(A), expression PE should be that the flux of multicast of A is transmitted to CE with the assigned address that receives, at this moment, in main multicast table, the multicast source address information of CE is revised and to be got back to PE and carry out IGMPv3 and the IGMPv2 situation before switching, consistent with the source address information of CE in the backup multicast table in main multicast table, can carry out multicast forwarding according to the source address information in main multicast table;
Like this, in the situation that main multicast table is consistent with the multicast source address information of backup in multicast table, according to the multicast source address in main multicast list, CE is carried out multicast forwarding across VPN;
Particularly, can receive a flux of multicast at PE, carry out flux of multicast when forwarding, sign according to this flux of multicast, inquire about program request in main multicast table and backup multicast table the multicast source address information of CE of this flux of multicast sign whether consistent, in inconsistent situation, situation about recording in multicast table according to backup is with this flux of multicast CE of this flux of multicast that has been transmitted to program request, in the situation that consistent, carry out the forwarding of flux of multicast according to situation about recording in main multicast table.
According to the above-mentioned easily table forwarding mechanism of selecting a good opportunity, can ensure that correct forwarding is across the flux of multicast of the appointment information source of VPN.
Particularly, when main multicast forward table and the backup multicast forward table comprise for a plurality of CE record list item the time, the multicast sign that PE carries in can the report message according to the report message of the IGMPv3 that receives or IGMPv2, and the address information of CE, the matching inquiry list item consistent with the address information of this multicast sign and CE in described backup multicast table finds the multicast source address information of CE from this list item.
Further, when deleted for the independent main multicast table of CE foundation, perhaps comprise in a plurality of main multicast tables that record list item CE recorded that list item is deleted to be fallen, illustrate that CE has withdrawed from the program request to flux of multicast,, delete the backup multicast table corresponding with independent main multicast table, perhaps delete the list item that records for CE in the backup multicast table corresponding with the main multicast table that comprises a plurality of records.
by above-mentioned processing procedure, PE sets up the backup multicast table of the main multicast table of CE, according to the easily table forwarding mechanism of selecting a good opportunity, carry out in the different phase of IGMPv3 and IGMPv2 switching at PE, PE can modify to the content in the multicast source address item in main multicast table, concrete modification situation is: exclude(NULL) → EXCLUDE(A) → INCLUDE(A), but can not modify to the multicast table of backup, PE is in the process of carrying out IGMPv3 and IGMPv2 switching like this, in the situation that the multicast source address information inconsistency in main multicast table and backup multicast table, carry out multicast forwarding across VPN according to the multicast source address of backup in multicast table, in the situation that main multicast table is consistent with the multicast source address information of backup in multicast table, carry out multicast forwarding across VPN according to the multicast source address information in main multicast table, can be take the backup multicast table as reference frame, carry out in the process of IGMPv3 and IGMPv2 switching at PE, reliable effectively the realization carried out multicast forwarding across VPN to CE, can solve in prior art at PE when the v2 that IGMP occurs and v3 version switch, forward according to the main multicast table of continuous modification, cause the problem across the source-specific multicast of VPN cutout to CE.
Based on identical inventive concept, the embodiment of the present invention also provides a kind of source-specific multicast Zhuan Ge across VPN.
Fig. 3 shows the embodiment of the present invention structured flowchart across the source-specific multicast Zhuan Ge of VPN is provided, and Gai Zhuan Ge comprises:
Particularly, forwarding module 32 in the situation that described PE receive from the report message of the IGMPv2 of described CE and the multicast source address information inconsistency in described main multicast table and described backup multicast table, perhaps in the situation that described PE receives from the report message of the IGMPv3 of described CE and the multicast source address information inconsistency in described main multicast table and described backup multicast table, according to the multicast source address information in described backup multicast table, described CE is carried out multicast forwarding across VPN;
Further, forwarding module 32 also is used for the multicast sign that the report message of the report message of the IGMPv3 that receives according to described PE or IGMPv2 is carried, and the address information of CE, and matching inquiry is to the multicast source address information of CE in the backup multicast table.
Preferably, as shown in Figure 4, on the basis of dress Ge shown in Figure 3, the source-specific multicast dress Ge across VPN that the embodiment of the present invention provides can also comprise: removing module 33, be connected to backup module 31, and be used for after main multicast table is deleted deletion backup multicast table.
The operation principle of Fig. 3 or Zhuan Ge shown in Figure 4 repeats no more as shown in Figure 2 here.
By as Fig. 3 or De Zhuan Ge shown in Figure 4, also can carry out in the process of IGMPv3 and IGMPv2 switching at PE, reliable effectively the realization carried out multicast forwarding across VPN to CE, can solve in prior art at PE when the v2 that IGMP occurs and v3 version switch, forward according to the main multicast table of continuous modification, cause the problem across the source-specific multicast of VPN cutout to CE.
Based on identical inventive concept, the embodiment of the present invention also provides a kind of network equipment, and this network equipment comprises that as Fig. 3 or the source-specific multicast Zhuan Ge across VPN shown in Figure 4, preferably, this Wang Luo Zhuan Ge can be PE.
One of ordinary skill in the art will appreciate that and realize that all or part of step that above-described embodiment method is carried is to come the relevant hardware of instruction to complete by program, described program can be stored in a kind of computer-readable recording medium, this program comprises step of embodiment of the method one or a combination set of when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in a computer read/write memory medium.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect fully.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code one or more.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the present invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the dress Ge that realizes in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce and comprise the manufacture that refers to order dress Ge, this refers to make dress Ge to realize the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby be provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction of carrying out on computer or other programmable devices.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. the source-specific multicast method of a crossing virtual private networks network VPN, is characterized in that, comprising:
Provider edge router PE is detecting operation the Internet this IGMPv3 of the multicast member management protocol third edition on definite described PE, and detect and determine that the communication terminal CE that belongs in VPN that is connected with described PE upward moves in the situation of IGMPv3 and source-specific multicast pattern, to backing up according to the main multicast table of setting up from the report message of the IGMPv3 version of described CE, include the multicast source address information across the flux of multicast of VPN of described CE program request in described main multicast table and backup multicast table;
Described PE is in the process of carrying out IGMPv3 and IGMPv2 switching, in the situation that the multicast source address information inconsistency in described main multicast table and described backup multicast table, according to the multicast source address information in described backup multicast table, described CE is carried out multicast forwarding across VPN.
2. method according to claim 1, it is characterized in that, in the situation that the multicast source address information inconsistency in described main multicast table and described backup multicast table, according to the multicast source address in described backup multicast table, described CE is carried out multicast forwarding across VPN, specifically comprise:
In the situation that described PE receives report message or the report message of IGMPv3 and the multicast source address information inconsistency in described main multicast table and described backup multicast table from the IGMPv2 of described CE, according to the multicast source address information in described backup multicast table, described CE is carried out multicast forwarding across VPN.
3. method according to claim 1, is characterized in that, described method also comprises:
In the situation that described main multicast table is consistent with multicast source address information in described backup multicast table, according to the multicast source address information in main multicast table, described CE is carried out multicast forwarding across VPN.
4. method according to claim 1, is characterized in that, also includes in described main multicast table He in described backup multicast table: the multicast sign across the flux of multicast of VPN of described CE program request;
Described method also comprises:
Record the address information of described CE in described backup multicast table;
The multicast sign of carrying in the report message of the described IGMPv3 that described PE basis receives or the report message of IGMPv2, and the address information of described CE, matching inquiry is to the multicast source address information of described CE in described backup multicast table.
5. method according to claim 1, is characterized in that, described method also comprises:
After described main multicast table is deleted, delete described backup multicast table.
6. the described method of any one according to claim 1～5, is characterized in that, the address information of described CE comprises:
The Internet protocol IP address information of described CE and media interviews control information.
7. the source-specific multicast device of a crossing virtual private networks network VPN, is characterized in that, comprising:
Backup module, be used for detecting at described device place PE and determine operation the Internet this IGMPv3 of the multicast member management protocol third edition on described PE, and detect and determine that the communication terminal CE that belongs in VPN that is connected with described PE upward moves in the situation of IGMPv3 and source-specific multicast pattern, described PE is backed up according to the main multicast table of setting up from the report message of the IGMPv3 version of described CE, include the multicast source address information across the flux of multicast of VPN of described CE program request in described main multicast table and backup multicast table;
Forwarding module, be used for carrying out at described device place PE the process of IGMPv3 and IGMPv2 switching, in the situation that the multicast source address information inconsistency in described main multicast table and described backup multicast table, according to the multicast source address information in described backup multicast table, described CE is carried out multicast forwarding across VPN.
8. device according to claim 7, is characterized in that, described forwarding module specifically is used for:
In the situation that described PE receives report message or the report message of IGMPv3 and the multicast source address information inconsistency in described main multicast table and described backup multicast table from the IGMPv2 of described CE, according to the multicast source address information in described backup multicast table, described CE is carried out multicast forwarding across VPN.
9. device according to claim 7, is characterized in that, described forwarding module also is used for:
In the situation that described main multicast table is consistent with multicast source address information in described backup multicast table, according to the multicast source address information in main multicast table, described CE is carried out multicast forwarding across VPN.
10. device according to claim 7, is characterized in that, also includes in described main multicast table He in described backup multicast table: the multicast sign across the flux of multicast of VPN of described CE program request;
Described backup module also is used for: the address information that records described CE at described backup multicast table;
Described forwarding module, also be used for: the multicast sign that the report message of the described IGMPv3 that receives according to described PE or the report message of described IGMPv2 are carried, and the address information of described CE, matching inquiry is to the multicast source address information of described CE in described backup multicast table.
11. device according to claim 7 is characterized in that, described device also comprises:
Removing module is used for deleting described backup multicast table after described main multicast table is deleted.
12. a network equipment is characterized in that, comprises the source-specific multicast device of crossing virtual private networks network as described in any one in claim 7～11.
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Address after: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 Garden State Industrial Park 19 floor Patentee after: RUIJIE NETWORKS Co.,Ltd. Address before: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 Garden State Industrial Park 19 floor Patentee before: Beijing Star-Net Ruijie Networks Co.,Ltd. |