CN101488873B - Multicast joining method and system - Google Patents
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- CN101488873B CN101488873B CN2009100781715A CN200910078171A CN101488873B CN 101488873 B CN101488873 B CN 101488873B CN 2009100781715 A CN2009100781715 A CN 2009100781715A CN 200910078171 A CN200910078171 A CN 200910078171A CN 101488873 B CN101488873 B CN 101488873B
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Abstract
The invention discloses a multicast adding method and system, the method comprises the following steps: the RP transmits the present registered source set information as survival source set information to each interface per se existing protocol irrelevant multicast PIM neighbors, the last one hop apparatus in the multicast network receives and preservers the survival source set information; the multicasting ordering person initiates a multicast adding message, the last one hop apparatus receives the message, determines the source corresponding to the multicast to be added by the ordering person according to the survival source set information to initiate the multicast adding process flow to the source direction directly. When the source corresponding to the multicast is changed, the multicast ordering person can add the multicast to the new source automatically.
Description
Technical field
The present invention relates to technical field of multicast, be specifically related to multicast joining method and system.
Background technology
Understand for convenient, at first multicasting technology term mentioned in this article described:
Protocol Independent Multicast (PIM, Protocol Independent Multicast): multicast does not rely on specific I P Routing Protocol.
Protocol Independent Multicast Sparse Mode (PIM-SM, Protocol Independent Multicast-Sparse Mode): refer to that multicast message only is sent to the position of needs.
Protocol Independent Multicast source-specific multicast (PIM-SSM, Protocol Independent Multicast-Source Specific Mode): (IGMPv3, InternetGroup Management Protocol v3) comes the relation between maintenance host and the router by the Internet Group Management Protocol version 3.In actual applications, adopt a part of technology of PIM-SM pattern to realize the SSM model usually.Since the recipient by other channel as advertising consulting etc., known the particular location of multicast source, therefore in the SSM model, need not to share node (RP, Rendezvous Point), need not to make up shared node tree (RPT, Rendezvous Point Tree), need not process for registering the multicast source, also need not to find the multicast source in other PIM territory by Multicast Source Discovery Protocol (MSDP, Multicast Source Discovery Protocol).
Reverse path is transmitted (RPF, Reverse Path Forward): a kind of inspection receives whether the interface of message is the way of correct interface in the multicast.
Internet Group Management Protocol version 2 (IGMPv2): in multicast application, find the multicast recipient of assigned source not and notify three layers of multicast protocol by IGMP.
Internet Group Management Protocol version 3 (3IGMPv3): this agreement can realize initiating to assigned source the multicast recipient of adding on the IGMPv2 basis.
Source Designated Router (SDR, Source Designed Router): with the direct-connected router of multicast source.
Last-hop Router (LDR, Last-hop Designed Router): with the direct-connected router of multicast on demand person.
(*, G): be commonly used to represent shared tree, also can represent to mail to the multicast message of multicast group G by any multicast source.Wherein " * " represents any multicast source, and " G " represents particular multicast group G.
(S, G): be also referred to as " multicast source group ", be commonly used to represent shortest path tree, also can represent to mail to the multicast message of multicast group G by multicast source S." S " wherein represents specific multicast source S, and " G " represents particular multicast group G.
Find multicast on demand person by IGMP, and by PIM SM agreement safeguard multicast path by, so just far-end multicast source data forwarding can be arrived program request person, thus the realization multicast functionality.Fig. 1 is a PIM SM networking diagram, as shown in Figure 1, multicast source transmission multicast data flow (200.1.1.100,225.1.1.1), wherein, 200.1.1.100 is a source address, 225.1.1.1 is a group address; SDR sends the clean culture logon message to RP after receiving this multicast data flow, this message carry the source group address (200.1.1.100,225.1.1.1), after RP receives this logon message, learnt that (200.1.1.100 225.1.1.1) and to SDR responds stopped registration messages to the source group address of surviving; When program request person wants to obtain group 225.1.1.1, send (225.1.1.1) IGMP report message, after LDR received this message, (* G) joined message to the transmission of RP direction; Program request person was issued in the circulation of guiding multicast after RP received this message.LDR carries out shortest path tree (SPT) switching after receiving multicast data flow by RPT, and directly (200.1.1.100 225.1.1.1) joins message, and realizes that at last multicast data flow is forwarded to program request person by SPT to the transmission of multicast source direction.
In present PIM SM realized, organizing adding for IGMPv1, IGMPv2 must add to RP request group earlier, and RP carries out the SPT switching after receiving multicast data flow again, could carry out the multicast data flow forwarding by SPT at last.There is following defective in this scheme:
One, carrying out the path that multicast data flow transmits by RPT is not optimal path, has prolonged the multicast forwarding time-delay.
Transmit though two finally can utilize the SPT path to carry out multicast data flow, may have message dropping or message overlapping phenomenon in the SPT handoff procedure; And the RPT process has increased the complexity of PIM SM to the switching of SPT process.
Industry is at the realization of PIM SM at present, when only supporting IGMPv2, program request person passes through configuration IGMP SSM Mapping strategy on LDR, that is: on LDR the configuration each group address correspondence source address, like this, LDR receives when the IGMPv2 group joins message, and determines corresponding source address according to the group address in this message earlier, joins message to source address direction transmission group then, just can directly carry out multicast data flow and transmit, reduce the process that RPT switches to SPT by SPT.Fig. 2 has provided IGMP SSMMapping networking diagram, as shown in Figure 2, at first configuration 225.1.1.1 is a SSM scope group address on LDR, and the source address of configuration 225.1.1.1 correspondence is 200.1.1.100, when LDR receives (225.1.1.1) IGMPv2 report message of program request person's transmission, directly (S, G) PIM joins message and guides multicast stream to be forwarded to program request person by shortest path to the transmission of 200.1.1.100 direction.
Though present scheme has realized directly adding function to the source fast, but when in the network program request person who is in diverse location in a large number being arranged, need each last-hop Router as: carry out a large amount of IGMP SSM Mapping policy configurations on the LDR, and when the corresponding source of group changes, can not add from the new source of trend, must revise the IGMP SSM Mapping strategy that disposes on each last-hop Router, increase the workload of network manager.
Summary of the invention
The invention provides multicast joining method and system, when changing to be implemented in the corresponding source of group, multicast on demand person can add from the new source of trend.
Technical scheme of the present invention is achieved in that
A kind of multicast joining method, this method comprises:
RP sends as survival source group information the source group information of current registration to each interface that self has PIM neighbours, the final jump equipment in the multicast network receives and preserve survival source group information;
Multicast on demand person's initiation group joins message, and final jump equipment receives this message, according to survival source group information, determines the source of the group correspondence that program request person will add, and directly adds flow process to source side to initiating multicast.
Described RP comprises the source group information of current registration to each interface transmission that self has PIM neighbours:
RP sends as survival source group information the registered of self maintained and not aged source group information every Preset Time at interval to each interface that self has PIM neighbours.
Described method further comprises:
When RP finds to have registered source to wear out, with the source group information and aging sign of this source correspondence to each interface transmission that self has PIM neighbours; Final jump equipment in the multicast network receives this source group information and aging sign, and this source group information is deleted from the survival source group information of self preserving.
Described method further comprises:
When RP finds to have new source group to register, this new source group information is sent to each interface that self has PIM neighbours as new survival source group information; Final jump equipment in the multicast network receives and preserves this survival source group information.
The described RP source group information of will surviving sends to each interface that self has PIM neighbours and further comprises: RP will survive the aging duration in source of source group information to each interface transmission that self has PIM neighbours;
And the final jump equipment in the described multicast network receives and preserves the aging duration in source of survival source group information;
And described method further comprises:
When active group of final jump device discovery wears out, this source group information is deleted from the survival source group information of self preserving; When the source group information of finding to receive has been present in the survival source group information of self preserving, with the reset source ageing timer of this source group of the aging duration in the source that receives; When finding that the source group information that receives is not present in the survival source group information of self preserving, the source ageing timer of this source group is set with the aging duration in the source that receives then.
The aging duration in the source of described survival source group information sends the time interval of survival source group information greater than RP.
Described multicast joins message and is igmp version 2 report messages, perhaps igmp version 1 report message.
Described RP will be survived, and the final jump equipment of source group information after each interface that self has Protocol Independent Multicast PIM neighbours sends, in the multicast network receives and preservation survival source group information further comprises before:
Intermediate equipment in the multicast network receives survival source group information, carries out reverse path and transmits rpf check, if inspection is passed through, exists each interface of PIM neighbours to send this survival source group information to this equipment; Otherwise, abandon this survival source group information.
A kind of multicast adds system, and this system comprises:
RP sends as survival source group information the source group information of current registration to each interface that self has PIM neighbours;
Final jump equipment receives and preserves survival source group information, when the multicast that receives multicast on demand person's initiation joins message, according to survival source group information, determines the source of the group correspondence that program request person will add, and directly adds flow process to source side to initiating multicast.
Described RP comprises:
(S, the clean culture logon message that G) list item maintenance module, reception sources designated equipment are sent, with the source group information in this message be kept at self maintained (S is G) in the list item;
The timed sending trigger module, every Preset Time at interval, with (S, G) (S, G) list item exists each interface of PIM neighbours to send as survival source group information to this RP to all of list item maintenance module maintenance.
Described RP further comprises:
Aging module, find (S, G) the list item maintenance module safeguard (S, G) list item is aging, should (S, G) the source group information of list item correspondence and aging sign exist each interface of PIM neighbours to send to this RP, and from (S, G) (S, G) this (S, G) list item of deletion in the list item of the maintenance of list item maintenance module;
And, when described final jump equipment receives source group information and aging sign, this source group information is deleted from the group information of survival source.
Described (S, G) the list item maintenance module further comprises:
When finding to have the group registration of new source, with this source group information add to self maintained (S G) in the list item, and exists each interface of PIM neighbours to send as new survival source group information to this RP this source group information.
Described RP further comprises: the aging duration in the source of the source group information of current registration is sent to each interface that self has PIM neighbours;
And described final jump equipment comprises:
Multicast adds processing module, receives and preserve survival source group information, when the multicast that receives multicast on demand person's initiation joins message, according to survival source group information, determines the source of the group correspondence that program request person will add, and directly adds flow process to source side to initiating multicast;
The burin-in process module receives the aging duration in source from the survival source group information of RP, and is active when aging when finding, the source group information of this source correspondence added the survival source group information that processing module preserves from multicast delete; Judge whether the source group information that receives has been present in the survival source group information of multicast adding processing module preservation, if exist, whether the aging duration in source of judging this source group information that receives is 0, if this source group information is deleted from the survival source group information that multicast adding processing module is safeguarded; Otherwise, with the reset source ageing timer of this source group information of the aging duration in the source that receives; If do not exist, then the source group information that receives is added to multicast and add in the survival source group information of processing module preservation, and the source ageing timer of this source group information is set with the aging duration in the source that receives.
Compared with prior art, among the present invention, RP sends as survival source group information the source group information of current registration to each interface that self has PIM neighbours, and the final jump equipment in the multicast network receives and preserve survival source group information; When multicast on demand person's initiation group joined message, final jump equipment received this message, according to survival source group information, determined the source of the group correspondence that program request person will add, and directly added flow process to source side to initiating multicast.The present invention only supports program request person under the situation of IGMPv1 and/or IGMPv2, when the corresponding source of group changes, can directly add from the new source of trend; And the present invention need not configuration IGMP SSM Mapping strategy on LDR, has alleviated the burden of network manager.
Description of drawings
Fig. 1 is an existing P IM SM networking diagram;
Fig. 2 is existing IGMP SSM Mapping networking diagram;
Fig. 3 adds flow chart for the multicast that the embodiment of the invention provides;
The form schematic diagram of the SGA message that Fig. 4 provides for the embodiment of the invention;
The transmission course exemplary plot of the SGA message that Fig. 5 provides for the embodiment of the invention.
Fig. 6 is a concrete application example schematic diagram of the present invention;
The multicast that Fig. 7 provides for the embodiment of the invention adds the composition diagram of system;
The structure chart of the RP that Fig. 8 provides for the embodiment of the invention;
The structure chart of the LDR that Fig. 9 provides for the embodiment of the invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Basic thought of the present invention is: RP mails to each interface that self has PIM neighbours with the source group information of current registration as survival source group information, and LDR receives and preserve survival source group information; When multicast on demand person's initiation group joined message, LDR determined the source of the group correspondence that program request person will add according to survival source group information, directly adds flow process to source side to the initiation group then.
Fig. 3 adds flow chart for the multicast that the embodiment of the invention provides, and as shown in Figure 3, its concrete steps are as follows:
Step 301: the multicast source in the multicast network sends multicast data flow, and each receives that the SDR of multicast data flow initiates the clean culture logon message to RP, carries the source group information of this multicast data flow in this message.
Source group information comprises: group address, source address etc.
Step 302:RP receives logon message, the source group maintenance of information (S, G) list item that carry according to this message, according to this (S, G) list item packaged source group survival (SGA, Source Group Active) message, all exist PIM neighbours' interface to send to self with this SGA message.
The SGA message only sends to the interface that has PIM neighbours, can reduce unnecessary message like this and send, and has alleviated the load of message receiving equipment simultaneously.
RP specifically can send the SGA message in the following way:
Every Preset Time at interval as: 60s, (S, G) list item is packaged into the SGA message as survival source group information, sends to each interface that self has PIM neighbours with all of self maintained.Simultaneously, (S is when G) list item is aging, according to this (S when discovery has, G) list item encapsulation SGA message, carry in this message this (S, G) the source group information of list item correspondence, and the Holdtime field in the message is 0 aging to represent this source group information, then should (S, G) list item from self maintained (S G) deletes in the list item, and this SGA message is sent to each interface that self has PIM neighbours; When RP finds to have the group registration of new source, with this source group information add to self maintained (S, G) in the list item, and according to this source group information correspondence (S, G) list item encapsulation SGA message sends this SGA message to each interface that self has PIM neighbours.
Source group information in the clean culture logon message is not present in the RP maintenance, and (S in the time of G) in the list item, illustrates that this source group is a new adding source group, interrupts for fear of multicast data flow, should immediately this source group information be mail to each interface that self has PIM neighbours by the SGA message.
Fig. 4 has provided the form of SGA message, and as shown in Figure 4, each field meaning is as follows:
PIM Ver field: expression PIM version number.In the present embodiment, be set to " 2 ".
The type field: the type of expression PIM message.In the present embodiment, being set to " 11 ", is the SGA message to represent this message.
Destination field: the sending direction of expression message.In the present embodiment, be set to " Multicast toALL-PIM-ROUTERS ", mail to the interface that there are PIM neighbours in all with the expression message, value is " 224.0.0.13 " usually.
Reserved field: reserved field.Usually be set to 0, can ignore this field during reception.
Checksum field: i.e. standard I P checksum field.
Multicast Group Address field: expression survival group address.
Number of Sources field: the source number of expression survival group correspondence.
The Holdtime field: duration wears out in the expression source.The Preset Time that its value sends the SGA message greater than RP is generally at interval 3 times of Preset Time that RP sends the SGA message at interval.
Source Address List field: the source address list of expression survival group correspondence.
Can carry multiple source group information simultaneously in the same SGA message.The aging duration in source of not homology group information that belongs to same group is identical usually.
Step 303: equipment in the multicast network receives the SGA message, carries out rpf check with the source IP address of SGA message, if rpf check is passed through, all exist PIM neighbours' interface to transmit this SGA message to self.
If rpf check is not passed through, then equipment can abandon this SGA message.
For example: the transmission course exemplary plot of the SGA message that Fig. 5 provides for the embodiment of the invention, as shown in Figure 5, equipment C receives the SGA message from the interface that links to each other with RP, this message is carried out rpf check, if check and to pass through, then can continue to exist PIM neighbours' interface to transmit this SGA message to except that the message receiving interface other; And if equipment C receives the SGA message from the interface that links to each other with equipment SDR B, then rpf check just can not be passed through, thereby equipment C can not transmit this SGA message.
Step 304: when LDR receives the SGA message of hop-by-hop arrival, carry out rpf check earlier,, then parse the source group information in the message, then the source group information in the message is saved in the survival source group information of self maintained if rpf check is passed through.
If rpf check is not passed through, then LDR can abandon this SGA message.
Except carrying source group information, also carry the aging duration in source of each source group simultaneously in the SGA message, after LDR receives the SGA message, also can handle the source ageing timer of each source group, specific as follows:
To each the source group information in the SGA message, LDR searches this source group information in the group information of the survival source of self maintained, if find execution in step A; Otherwise, execution in step B.
A: if the aging duration in the source of this source group information is 0 in the SGA message, then LDR deletes this source group information from the survival source group information of self maintained; If the aging duration in the source of this source group information is not 0 in the SGA message, then LDR is with the source ageing timer of this source group information of the aging duration replacement self maintained in source of this source group information in the SGA message.
B:LDR determines that this source group information is new source group information, this source group information is added in the survival source group information of self maintained, and the source ageing timer of this source group information is set with the aging duration in the source of this source group information in the SGA message.
When the source ageing timer of a source group information was overtime, LDR deleted this source group information from the survival source group information of self maintained.
Step 305: multicast on demand person sends the IGMP report message, and this message carries group address.
Step 306:LDR receives this IGMP report message, judges that this message is IGMPv3 message or IGMPv1 message or IGMPv2 message, if the IGMPv3 message, execution in step 307; If IGMPv1 message or IGMPv2 message, execution in step 308.
Step 307:LDR carries out multicast according to existing SSM flow process and adds, and this flow process finishes.
Step 308:LDR searches the group address that this IGMPv1 or IGMPv2 report message are carried in the group information of the survival source of self maintained.
Step 309:LDR judges whether to find, if, execution in step 311; Otherwise, execution in step 310.
Step 310:LDR carries out multicast according to existing procedure to RP and adds, and this flow process finishes.
Step 311:LDR is according to the source address of this group address correspondence in the survival source group information of self maintained, and directly (S, G) PIM joins message to each source address direction transmission.
If it is a plurality of that the source address of group address correspondence has, then LDR needs at each source address, send one (S, G) PIM joins message, wherein, S is a source address, G is a group address.
LDR in the embodiment of the invention can determine in the following way:
One, with the direct-connected equipment of multicast on demand person on configuration LDR instruction, be LDR to indicate this equipment.
Two, default enable the equipment of IGMP interface be LDR.
Fig. 6 is a concrete application example schematic diagram of the present invention, as shown in Figure 6, there are two multicast sources 1 and 2 in the multicast network, the source group information of the multicast data flow of sending is respectively: (200.1.1.100,225.1.1.1) and (100.1.1.160,226.1.1.3), when SDR A receives the multicast data flow that multicast source 1 sends, carry (200.1.1.100 to the RP transmission, 225.1.1.1) the clean culture logon message, when SDR B receives the multicast data flow that multicast source 2 sends, send to RP and to carry (100.1.1.160,226.1.1.3) the clean culture logon message, like this, RP can be respectively with (200.1.1.100 is 225.1.1.1) with (100.1.1.160,226.1.1.3) be encapsulated in the SGA message, send to each interface that self has PIM neighbours; Last LDR receives this two SGA message, with (200.1.1.100 is 225.1.1.1) with (100.1.1.160 226.1.1.3) preserves as survival source group information; When program request person initiated to carry the IGMPv2 report message of 225.1.1.1, LDR received this message, and the source address of determining the 225.1.1.1 correspondence is 200.1.1.100, then initiate (S, G) PIM joins message, and wherein, S is 200.1.1.100, and G is 225.1.1.1.
The multicast that Fig. 7 provides for the embodiment of the invention adds the composition diagram of system, and as shown in Figure 7, it mainly comprises: RP71 and LDR72, wherein:
RP71: receive the clean culture logon message that SDR sends, (S, G) list item according to (S, G list item) encapsulation SGA message, send the SGA message to each interface that self has PIM neighbours according to the source group maintenance of information in this message.
LDR72: receive SGA message, the source group information in this message is kept in the survival source group information of self maintained from RP71; IGMPv1 that receiving group program request person sends or IGMPv2 report message are searched the source address of the group address correspondence that this message carries in survival source group information, send to each source address direction of searching that (S G) joins message.
As shown in Figure 7, RP71 can comprise: (S, G) list item maintenance module 711, timed sending trigger module 712 and aging module 713, wherein:
(S, G) the list item maintenance module 711: receive the clean culture logon message that SDR sends, if the source group information in this clean culture logon message of finding is not present in (the S of self maintained, G) in the list item, determine that then this source group information is new source group information, adds this source information to the (S of self maintained, G) in the list item, and according to this (S, G) list item encapsulation SGA message send this SGA message to each interface that self has PIM neighbours.
Timed sending trigger module 712: every Preset Time at interval, according to (S, G) (S, G) list item encapsulation SGA message exists each interface of PIM neighbours to send to this RP this SGA message to all of list item maintenance module 711 maintenances.
Aging module 713: find to have (S, G) list item is aging, according to this (S, G) list item encapsulation SGA message, the aging duration in this message is 0, exists each interface of PIM neighbours to send to this RP this SGA message, and should (S, G) list item from (S, G) list item maintenance module 711 safeguard (S G) deletes in the list item.
As shown in Figure 8, LDR72 can comprise: multicast adds processing module 721 and burin-in process module 722, wherein:
Multicast adds processing module 721: receive the SGA message from RP71, the source group information in this message is kept in the survival source group information of self maintained; When IGMPv1 that receives multicast on demand person's initiation or IGMPv2 report message, in the group information of the survival source of self maintained, search the source address of the group address correspondence in this message, (S, G) PIM joins message to each source address direction transmission of searching.
Burin-in process module 722: active when aging when finding, the source group information of this source correspondence added the survival source group information that processing module 721 safeguards from multicast delete; Receive the SGA message, when the source group information in finding the SGA message has been present in multicast and has added in the survival source group information that processing module 721 safeguards, if the aging duration in the source of this source group information is 0 in the SGA message, then this source group information is deleted from the survival source group information that multicast adding processing module 721 is safeguarded, if find that the aging duration in source in the SGA message is not 0, then with the reset source ageing timer of this source group information of the aging duration in the source of this source group information in the SGA message; When the source group information in finding the SGA message is not present in multicast and adds in the survival source group information that processing module 721 safeguards, then the source group information in the SGA message is added to multicast and add in the survival source group information of processing module 721 maintenances, and the source ageing timer of this source group information is set with the aging duration in the source of this source group information in the SGA message.
Simultaneously, RP71 is further used for: the aging duration in the source of source group information is encapsulated in the SGA message.
The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a multicast joining method is characterized in that, this method comprises:
Shared node R P sends as survival source group information the source group information of current registration to each interface that self has Protocol Independent Multicast PIM neighbours, the final jump equipment in the multicast network receives and also preserves survival source group information;
Multicast on demand person's initiation group joins message, and final jump equipment receives this message, according to survival source group information, determines the source of the group correspondence that program request person will add, and directly adds flow process to source side to initiating multicast.
2. the method for claim 1 is characterized in that, described RP comprises the source group information of current registration to each interface transmission that self has PIM neighbours:
RP sends as survival source group information the registered of self maintained and not aged source group information every Preset Time at interval to each interface that self has PIM neighbours.
3. method as claimed in claim 2 is characterized in that, described method further comprises:
When RP finds to have registered source to wear out, with the source group information and aging sign of this source correspondence to each interface transmission that self has PIM neighbours; Final jump equipment in the multicast network receives this source group information and aging sign, and this source group information is deleted from the survival source group information of self preserving.
4. as claim 2 or 3 described methods, it is characterized in that described method further comprises:
When RP finds to have new source group to register, this new source group information is sent to each interface that self has PIM neighbours as new survival source group information; Final jump equipment in the multicast network receives and preserves this survival source group information.
5. as the arbitrary described method of claim 1 to 3, it is characterized in that the described RP source group information of will surviving sends to each interface that self has PIM neighbours and further comprises: RP will survive the aging duration in source of source group information to each interface transmission that self has PIM neighbours;
And the final jump equipment in the described multicast network receives and preserves the aging duration in source of survival source group information;
And described method further comprises:
When active group of final jump device discovery wears out, this source group information is deleted from the survival source group information of self preserving; When the source group information of finding to receive has been present in the survival source group information of self preserving, with the reset source ageing timer of this source group of the aging duration in the source that receives; When finding that the source group information that receives is not present in the survival source group information of self preserving, the source ageing timer of this source group is set with the aging duration in the source that receives then.
6. method as claimed in claim 5 is characterized in that, the aging duration in the source of described survival source group information sends the time interval of survival source group information greater than RP.
7. as the arbitrary described method of claim 1 to 3, it is characterized in that described multicast joins message and is Internet Group Management Protocol igmp version 2 report messages, perhaps igmp version 1 report message.
8. the method for claim 1, it is characterized in that described RP will be survived, and the final jump equipment of source group information after each interface that self has Protocol Independent Multicast PIM neighbours sends, in the multicast network receives and preservation survival source group information further comprises before:
Intermediate equipment in the multicast network receives survival source group information, carries out reverse path and transmits rpf check, if inspection is passed through, exists each interface of PIM neighbours to send this survival source group information to this equipment; Otherwise, abandon this survival source group information.
9. a multicast adds system, it is characterized in that this system comprises:
Share node R P, the source group information of current registration is sent to each interface that self has Protocol Independent Multicast PIM neighbours as survival source group information;
Final jump equipment receives and preserves survival source group information, when the multicast that receives multicast on demand person's initiation joins message, according to survival source group information, determines the source of the group correspondence that program request person will add, and directly adds flow process to source side to initiating multicast;
Described RP comprises:
(S, the clean culture logon message that G) list item maintenance module, reception sources designated equipment are sent, with the source group information in this message be kept at self maintained (S is G) in the list item;
The timed sending trigger module, every Preset Time at interval, with (S, G) (S, G) list item exists each interface of PIM neighbours to send as survival source group information to this RP to all of list item maintenance module maintenance.
10. system as claimed in claim 9 is characterized in that, described RP further comprises:
Aging module, find (S, G) the list item maintenance module safeguard (S, G) list item is aging, should (S, G) the source group information of list item correspondence and aging sign exist each interface of PIM neighbours to send to this RP, and from (S, G) (S, G) this (S, G) list item of deletion in the list item of the maintenance of list item maintenance module;
And, when described final jump equipment receives source group information and aging sign, this source group information is deleted from the group information of survival source.
11. as claim 9 or 10 described systems, it is characterized in that, described (S, G) the list item maintenance module further comprises:
When finding to have the group registration of new source, with this source group information add to self maintained (S G) in the list item, and exists each interface of PIM neighbours to send as new survival source group information to this RP this source group information.
12. system as claimed in claim 9 is characterized in that, described RP further comprises: the aging duration in the source of the source group information of current registration is sent to each interface that self has PIM neighbours;
And described final jump equipment comprises:
Multicast adds processing module, receives and preserve survival source group information, when the multicast that receives multicast on demand person's initiation joins message, according to survival source group information, determines the source of the group correspondence that program request person will add, and directly adds flow process to source side to initiating multicast;
The burin-in process module receives the aging duration in source from the survival source group information of RP, and is active when aging when finding, the source group information of this source correspondence added the survival source group information that processing module preserves from multicast delete; Judge whether the source group information that receives has been present in the survival source group information of multicast adding processing module preservation, if exist, whether the aging duration in source of judging this source group information that receives is 0, if this source group information is deleted from the survival source group information that multicast adding processing module is safeguarded; Otherwise, with the reset source ageing timer of this source group information of the aging duration in the source that receives; If do not exist, then the source group information that receives is added to multicast and add in the survival source group information of processing module preservation, and the source ageing timer of this source group information is set with the aging duration in the source that receives.
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| CN2009100781715A CN101488873B (en) | 2009-02-19 | 2009-02-19 | Multicast joining method and system |
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| CN101488873B true CN101488873B (en) | 2011-01-05 |
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| CN101710968B (en) * | 2009-12-04 | 2013-12-18 | 深圳创维数字技术股份有限公司 | Method for sharing and watching requested programmes through bidirectional set-top box and digital television broadcasting system thereof |
| WO2012178084A1 (en) * | 2011-06-22 | 2012-12-27 | Huawei Technologies Co., Ltd. | Protocol independent multicast last hop router discovery |
| CN103095585B (en) * | 2011-11-02 | 2018-08-07 | 中兴通讯股份有限公司 | The method and system of multicast control stream information intercommunication between a kind of IPv4 and IPv6 |
| CN103354524B (en) * | 2013-07-03 | 2016-08-10 | 杭州华三通信技术有限公司 | A kind of method and apparatus realizing three layers of on-demand routing of multicast based on PIM-SSM |
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