CN102624604A - Multicast control method, routing equipment and multicast system - Google Patents
Multicast control method, routing equipment and multicast system Download PDFInfo
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Abstract
The embodiment of the invention discloses a multicast control method, routing equipment and a multicast system. The method comprises the following steps that: second routing equipment on a shared network segment receives a first join request periodically sent by first routing equipment on the shared network segment, wherein the request carries reverse path forwarding (RPF) upstream neighbor information of the first routing equipment; when the second routing equipment determines that the second routing equipment itself is not an RPF upstream neighbor of the first routing equipment but is downstream routing equipment in the shared network segment, a second join request sent by downstream receiving equipment is received and then is not forwarded to an RPF upstream neighbor that is obtained according to unicast routing and is used for receiving the second join request temporarily; when the first join request is received again or a departure request sent by the first routing equipment is received, the RPF upstream neighbor that is obtained by the second routing equipment itself according to the unicast routing and is used for receiving the first join request is arranged as the RPF upstream neighbor that is carried in the first join request and the second join request is sent to the RPF upstream neighbor.
Description
Technical field
The present invention relates to network communications technology field, more particularly, relate to a kind of multicast control method, routing device and multi-cast system.
Background technology
Along with the fast development of internet, IP (Internet Protocol, the agreement that interconnects between the network) multicasting technology has been realized the efficient data transmission of IP network mid point to multiple spot.Because multicasting technology can save bandwidth Control Network flow effectively, alleviate server load, reduce offered load, therefore all be widely used aspect many at real time data transmission, multimedia conferencing etc.
The IP multicast protocol comprises between router and the recipient agreement between agreement and router and the router, and both combinations are used to make up from multicast source to the multicast transmit tree the multicast packet recipient.Agreement adopts IGMP (Internet Group Management Protocol usually between router and the recipient's main frame; Internet group management protocol); Usually adopt PIM (Protocol IndependentMulticast, Protocol Independent Multicast) agreement between router and the router.Wherein, PIM-SM (Protocol IndependentMulticast-Sparse Mode, Protocol Independent Multicast-lax pattern) agreement by standard, has obtained extensive use as a kind of typical multicast path.
In the PIM-SM agreement, multicast transmit tree to set up process as shown in Figure 1, wherein; 101～105 is five routers; 106 is first receiving equipment, and 107 is second receiving equipment, and 108 is multicast source; At first; After router one 04 receives that the IGMP of first receiving equipment 106 joins request, calculate the route of multicast source 108 according to clean culture, hop-by-hop upstream router sends PIM and joins message; Through approach routing device 104-on the road direction>routing device 102->routing device 101 sets up multicast and adds in-tree, the opposite direction that adds along the PIM message of multicast source is from routing device 101-then>routing device 102->routing device 104 gives first receiving equipment 106 with transmitting multicast data.
Set up the principle of forwarding tree according to PIM; PIM upstream sends the direction that joins message and calculates according to singlecast router; If routing device 105 is received simultaneously that second receiving equipment 107 is that send and is joined request with first receiving equipment, 106 the same IGMP so; Calculate according to singlecast router that to arrive multicast sources 108 from routing device 105 optimum through the route of routing devices 103, therefore set up simultaneously from routing device 101-routing device 103-the multicast transmit tree of routing device 105.At this moment can find routing device 102, the routing device 103 identical multicast traffic stream of forwarding on the shared network segment simultaneously.According to IP multicast protocol regulation, Assert (asserting) competition can take place when in sharing the network segment, producing the multicast packet of repetition, as shown in Figure 2.
For fear of sharing the multicast packet that produces repetition on the network segment; One of prior art solutions does; Arrive the expense of multicast source separately according to the router of vying each other; Select a little router of expense to continue multicast data forwarding stream, the router that expense is big stops forwarding multicast traffic stream, and periodically on the shared network segment, broadcasts the Assert message that carries own Overhead by the little router of expense; Avoid the generation once more of the multicast packet of repetition, thereby eliminate the double flow of sharing on the network segment.Visible in this processing procedure; This scheme is after sharing the multicast packet that has duplicated on the network segment, just to carry out the Assert competition process, and during the Assert competition took place, the user will exert an influence through the data that the shared network segment receives; For example: a large amount of mosaics can appear in the video image that receives; Poor user experience because the cycle is sent the Assert message, also can increase network burden simultaneously.
Second kind of solution of the prior art is that before sharing the multicast packet that does not also duplicate on the network segment, the cycle that just begins is sent the Assert message.Though this scheme can be avoided the generation of double flow in advance, in the shared network segment that the multicast packet of no repetition produces, the cycle is sent useless Assert message can influence performance, increases network burden.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of multicast control method, routing device and multi-cast system, avoids sharing the multicast packet that duplicates on the network segment.
The embodiment of the invention provides a kind of multicast control method, and said method comprises:
The first via that the secondary route equipment on the network segment of sharing receives on the said shared network segment is joined request by first of equipment periodic property transmission; Said first carry said first routing device in joining request reverse path transmit RPF upstream neighbor information, and the address information of multicast source;
Said secondary route equipment confirms it self is not the RPF upstream neighbor of said first routing device according to said RPF upstream neighbor information; And confirm from the time as the downstream routing device in the said shared network segment according to the address information of said multicast source; Receive then that the downstream receiving equipments sends second join request after, temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request;
When said secondary route equipment receive once more said first join request or receive that said first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
A kind of routing device, said routing device are positioned to be shared on the network segment, and said router comprises:
Receiver module; The first via that is used to receive on the said shared network segment is joined request by first of equipment periodic property transmission; Said first carry said first routing device in joining request reverse path transmit RPF upstream neighbor information, and the address information of multicast source;
The recognition of devices module is used for confirming according to said RPF upstream neighbor information whether self is the RPF upstream neighbor of said first routing device, and confirms according to the address information of said multicast source whether self is the downstream routing device in the said shared network segment;
Request processing module; Be used for confirming certainly as the downstream routing device in the said shared network segment; And receive that the downstream receiving equipments sends second when joining request; Temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request; When said receiver module time receive said first join request or receive that said first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
A kind of multi-cast system, said system comprises: is positioned at least one first routing device of sharing on the network segment, is positioned at least one the secondary route equipment on the said shared network segment, wherein,
Said first routing device is used for joining request to said secondary route equipment periodic property transmission first, said first carry said first routing device in joining request reverse path transmit RPF upstream neighbor information, and the address information of multicast source;
Said secondary route equipment; Being used to receive said first joins request; When confirming it self is not the RPF upstream neighbor of said first routing device according to said RPF upstream neighbor information; And confirm from the time as the downstream routing device in the said shared network segment according to the address information of said multicast source; Receive then that the downstream receiving equipments sends second join request after, temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request; When said secondary route equipment receive once more said first join request or receive that said first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
Compare with prior art; Share downstream routing device on the network segment in the embodiment of the invention after receiving joining request that the downstream receiving equipment sends; Be not directly to transmit this to join request to the upper reaches routing device that calculates acquisition by unicast path; But keep with the shared network segment in the already present upper reaches routing device that other join request consistent; The request of should inserting is forwarded to same upper reaches routing device, occurs many different muticast data transmission paths to the same multicast data in the network segment thereby avoid sharing.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the 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 in the PIM-SM agreement, the process of the setting up sketch map of multicast transmit tree;
Fig. 2 is the sketch map that the flow conflict takes place when sharing the multicast packet that produces repetition in the network segment;
The multicast control method schematic flow sheet that Fig. 3 provides for the embodiment of the invention;
The topological structure sketch map of the multicast network that Fig. 4 provides for the embodiment of the invention;
A kind of routing device structural representation of sharing on the network segment that is positioned at that Fig. 5 provides for the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, 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 are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
For fear of sharing the defective that occurs the same multicast transfer of data on the network segment, the embodiment of the invention provides a kind of multicast control method, routing device and multi-cast system.
The embodiment of the invention provides a kind of multicast control method, and is as shown in Figure 3, and this method can comprise:
301, sharing the first via that the secondary route equipment on the network segment receives on the said shared network segment is joined request by first of equipment periodic property forwarding; Said first carries RPF (the Reverse-path Forwarding of said first routing device in joining request; Reverse path is transmitted) upstream neighbor information, and the address information of multicast source;
In the PIM-SM agreement; When a routing device on a certain shared network segment that is arranged in multicast tree adds the source group of multicast tree according to recipient's request needs; At first can be according to the source address information in the route table items of himself, the singlecast router the routing device at the source address place of inquiry from this routing device to route table items, then; Confirm to be positioned at the RPF upstream neighbor at its upper reaches according to this singlecast router that inquires; And periodically send to this RPF upstream neighbor and to join request, during joining request, this carries the relevant information of its RPF upstream neighbor of confirming, and the source of multicast tree, group address.According to the regulation of PIM-SM agreement, the corresponding destination address that joins request is all routing devices that load the PIM-SM agreement in the network segment.Therefore; Send to a certain upper reaches routing device on this shared network segment though join request this moment, other routing devices on this network segment except that this particular upstream routing device, all loading PIM-SM agreements also can receive this and join request.Wherein, above-mentioned other routing devices not only comprise other upper reaches routing device, also comprise all downstream routing devices except that sending this routing device that joins request in this shared network segment.
Receive above-mentioned all routing devices that join request for sharing on the network segment; After receiving joining request that other routing devices on the same shared network segment send; In order to confirm whether need respond above-mentioned joining request; At first to self whether being that upstream equipment or upstream device in the above-mentioned shared network segment discerned, to carry out different operation.
In the embodiment of the invention, certain recipient initiates joins request and is assumed to be first and joins request, and sends this first routing device of joining request and is made as first routing device, shares to receive this first routing device of joining request on the network segment and be made as secondary route equipment.
302, said secondary route equipment confirms it self is not the RPF upstream neighbor of said first routing device according to said RPF upstream neighbor information; And confirm from the time as the downstream routing device in the said shared network segment according to the address information of said multicast source; Receive then that the downstream receiving equipments sends second join request after, temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request;
In the said process, when secondary route equipment receive first join request after, can obtain the RPF upstream neighbor information of first first routing device that carry in joining request, thereby can confirm this first joins message whether issue oneself.When the RPF upstream neighbor information of said first routing device that in first joins request, carries and self information do not meet; Can confirm that then this first joins message and be not to issue oneself; At this moment, secondary route equipment can directly abandon and carry this first packet of joining request.
The secondary route equipment in the network segment shared is not also received joining request that its downstream receiving equipment initiates this moment, but it can receive to share in the network segment and be transmitted to the multicast packet of the first via by equipment, thereby creates corresponding list item.Because secondary route equipment does not receive joining request of its downstream receiving equipment initiation, this list item can not instruct the forwarding of the multicast packet that receives, and corresponding multicast packet is terminated on secondary route equipment.
When receive that the downstream receiving equipments sends second when joining request; There has been the active list item of data in the secondary route device discovery; Add corresponding outgoing interface so that multicast data forwarding, but secondary route equipment is not to transmit this second RPF upstream neighbor that message joins request for the reception said second that self obtains according to singlecast router that joins request immediately, but transmits again after waiting for a period of time; For instance, waiting time can be for second cycle of joining request and sending.
303, when said secondary route equipment receive once more said first join request or receive that first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
When receiving first of first routing device transmission once more, secondary route equipment joins request; What perhaps first routing device sent leaves when asking; Obtain the RPF upstream neighbor information of carrying in the corresponding message; The RPF upstream neighbor information that the reception said second that self obtains according to singlecast router joins request is set; Make it first to join request or to leave the RPF upstream neighbor information of carrying in the request message consistent, and send second to this RPF upstream neighbor and join request, avoid sharing and occur many different muticast data transmission paths in the network segment to the same multicast data with first routing device sends.
It is thus clear that; In the embodiment of the invention; Share downstream routing device on the network segment after receiving joining request that the downstream receiving equipment sends; Be not to transmit this to the upper reaches routing device that calculates acquisition by unicast path at once to join request; But keep with the shared network segment in the already present upper reaches routing device that other join request consistent, should insert and ask to be forwarded to same upper reaches routing device, thereby avoid many different muticast data transmission paths that are directed against the same multicast data of appearance in the shared network segment.
In addition; For instance; If said secondary route equipment has other already present route table items; Be said RPF upstream neighbor information then with the upper reaches routing device information change in said other already present route table items, with keep with the shared network segment in the already present upper reaches routing device that other join request consistent.
When said secondary route equipment is confirmed certainly as the upper reaches routing device in the said shared network segment according to the address information of said multicast source; And judge self whether to be the said first RPF upstream neighbor of carrying in joining request; If; Then according to the address information of said multicast source, continue the upper level network segment to the said shared network segment and send said first and join request; If, then do not abandon said first and join request.
For the ease of to the making much of of embodiment of the invention technical scheme, will combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, complete description.
Fig. 4 is the topological structure sketch map of a kind of multicast network of providing of the embodiment of the invention.Wherein, Routing device 102, routing device 103, routing device 104 and routing device 105 are direct-connected at the same shared network segment; Routing device 102 is upper reaches routing device with routing device 103 sharing on the network segment; Routing device 104 is to be the downstream routing device with routing device 105 at the shared network segment, and routing device 102 has common upper reaches routing device 101, routing device 101 direct-connected multicast sources 108 with routing device 103; In addition; First receiving equipment 106 and second receiving equipment 107 are respectively the downstream receiving equipment of routing device 104 and routing device 105, and usually, first receiving equipment 106 and second receiving equipment 107 send the main process equipment of packet for request receiving group source 108.For downstream routing device 104, and if its joining request of receiving that first receiving equipment 106 sends (Join1 (S, G)), and inquire its RPF upstream neighbor when being routing device 102, then send (the Join1 (S, G)) that joins request to routing device 102.At this moment, share other all routing devices on the network segment, promptly routing device 103, routing device 105 all will receive (the Join1 (S, G)) that joins request.Routing device 103, routing device 105 can be according to this (Join (S that joins request; G)); Discern respectively and self be to share upper reaches routing device or the downstream routing device on the network segment and self whether be (the RPF upstream neighbor of appointment among the Join1 (S, G)) that joins request.For routing device 105, suppose that it joins request (during Join1 (S, G)) to routing device 104 transmissions at first receiving equipment 106; Second receiving equipment 107 does not send the (Join2 (S that joins request that adds the identical sources group to routing device 105; G)), therefore, routing device 105 does not join first receiving equipment 106 at this moment and sends in the source group of setting up that joins request; Also do not comprise route table items, directly abandon this and join message.(during Join2 (S, G)), routing device 105 detects to share and has (Join1 (S on the network segment and join request when second receiving equipment 107 sends to routing device 105; The multicast packet of G)) asking (S, G), so do not send (Join2 (S to the upstream neighbor that calculates according to singlecast router at once; But delayed delivery (Join2 (S, G)) message G)); Share simultaneously and share in the network segment that (multicast packet that Join1 (S, G)) asks waits for that receiving the following one-period that routing device 104 sends joins message; (obtain the information of RPF upper reaches routing device 102 among the Join1 (S, G)), and to correct self be routing device 102 by the RPF upstream neighbor that singlecast router obtains from joining request accordingly; And will join request that (Join2 (S, G)) is sent to routing device 102.
For routing device 102 and routing device 103, when (it self is the upper reaches routing device of sharing on the network segment that Join1 (S, G)) discerns respectively according to joining request; Then continue to judge whether self is (Join1 (the S that joins request; The RPF upstream neighbor of carrying G)), if, then according to the address information of said multicast source; Continuation is sent the (Join1 (S, G)) that joins request to the upper level network segment of the said shared network segment; If, then do not abandon (the Join1 (S, G)) that joins request.In the embodiment shown in fig. 4, routing device 102 is (the RPF upstream neighbor of confirming among the Join1 (S, G)) that joins request; Then routing device 102 continues to the upper level network segment of sharing the network segment, and promptly routing device 101 sends the (Join1 (S, G)) that joins request; And routing device 103 is not (Join1 (the S that joins request; G)) the RPF upstream neighbor of confirming in, then routing device 103 will receive joins request that (Join1 (S, G)) abandons.
In addition, above-mentioned receiving equipment sends join request can be specify multicast source S (S, G) type joins request, also can be expression designated multicast group G all multicast sources (*, G) type joins request.When joining request be (S, when G) joining request, the upstream device of sharing on the network segment is confirmed the RPF upstream neighbor through the singlecast router that finds multicast source S; For (*, G) type joins request, and then confirms the RPF upstream neighbor through the route that finds RP (Rendezvous Point, convergent point).
In the whole implement process of the foregoing description; Routing device 105 is before the PIM that sends self joins message; Share multicast transmit tree that routing device 104 creates and transmit the data of getting off; After in a transmission cycle, listening to the request message of sharing the routing device of creating existing multicast transmit tree in the network segment; With oneself joining in the multicast transmit tree that has existed, can avoid in sharing the network segment, creating different multicast transmit trees and situation that the double flow occurs, also can avoid the generation of Assert simultaneously.
Corresponding above-mentioned multicast control method embodiment, the embodiment of the invention also provides a kind of routing device of sharing on the network segment that is positioned at, and is as shown in Figure 5, is the structural representation of this routing device, and visible, said routing device can comprise:
Recognition of devices module 502 is used for confirming according to said RPF upstream neighbor information whether self is the RPF upstream neighbor of said first routing device, and confirms according to the address information of said multicast source whether self is the downstream routing device in the said shared network segment;
For instance; Described request processing module 503 also is used for confirming from as the upper reaches routing device in the said shared network segment time; Then judge self whether to be the said first RPF upstream neighbor of carrying in joining request; If, continue the upper level network segment to the said shared network segment and send said first and join request then according to the address information of said multicast source; If, then do not abandon said first and join request.
For instance, said first joins request, and comprising: the first via by the designated multicast source S of device forwards (S G) joins request, perhaps represent designated multicast group G all multicast sources (* G) joins request.
The concrete course of work that above-mentioned each functional module is related can no longer be given unnecessary details with reference to related related content among the aforementioned multicast control method embodiment here.
When being positioned at, shares on the network segment said routing device; After receiving joining request that the downstream receiving equipments sends; Be not directly to transmit this to join request to the upper reaches routing device that calculates acquisition by unicast path; But keep with the shared network segment in the already present upper reaches routing device that other join request consistent, should insert and ask to be forwarded to same upper reaches routing device, thereby can avoid many different muticast data transmission paths that are directed against the same multicast data of appearance in the shared network segment.
Corresponding the foregoing description, the embodiment of the invention also provide a kind of multi-cast system, and said system comprises: be positioned at least one first routing device of sharing on the network segment, be positioned at least one the secondary route equipment on the said shared network segment, wherein,
Said first routing device is used for, and joins request to said secondary route device forwards first, and the reverse path that carries said first routing device in said the joining request is transmitted RPF upstream neighbor information, and the address information of multicast source;
Said secondary route equipment is used for; Receiving said first joins request; When confirming it self is not the RPF upstream neighbor of said first routing device according to said RPF upstream neighbor information; And confirm from the time as the downstream routing device in the said shared network segment according to the address information of said multicast source; Receive then that the downstream receiving equipments sends second join request after, temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request; When said secondary route equipment receive once more said first join request or receive that said first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
In addition, said system can also comprise: multicast source is used for joining request or the second transmission multicast packet that joins request of secondary route equipment according to first of said first routing device.
For instance; Said secondary route equipment also is used for; When confirming according to the address information of said multicast source from as the upper reaches routing device in the said shared network segment, then judge self whether to be the said first RPF upstream neighbor of carrying in joining request, if; Then according to the address information of said multicast source, continue the upper level network segment to the said shared network segment and send said first and join request; If, then do not abandon said first and join request.
For system embodiment, because it is basically corresponding to method, apparatus embodiments, so describe fairly simplely, relevant part gets final product referring to the part explanation of method and apparatus embodiment.Device embodiment described above only is schematic; Wherein said unit as the separating component explanation can or can not be physically to separate also; The parts that show as the unit can be or can not be physical locations also; Promptly can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can realize the purpose of present embodiment scheme according to the needs selection some or all of module wherein of reality.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium; This program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-OnlyMemory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the embodiment of the invention or scope in other embodiments among this paper.Therefore, the embodiment of the invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. a multicast control method is characterized in that, said method comprises:
The first via that the secondary route equipment on the network segment of sharing receives on the said shared network segment is joined request by first of equipment periodic property transmission; Said first carry said first routing device in joining request reverse path transmit RPF upstream neighbor information, and the address information of multicast source;
Said secondary route equipment confirms it self is not the RPF upstream neighbor of said first routing device according to said RPF upstream neighbor information; And confirm from the time as the downstream routing device in the said shared network segment according to the address information of said multicast source; Receive then that the downstream receiving equipments sends second join request after, temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request;
When said secondary route equipment receive once more said first join request or receive that said first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
2. multicast control method according to claim 1 is characterized in that, said method also comprises:
Confirm from as the upper reaches routing device in the said shared network segment according to the address information of said multicast source when said secondary route equipment, then judge self whether to be the said first RPF upstream neighbor of carrying in joining request;
If self be the said first RPF upstream neighbor of carrying in joining request,, continue the upper level network segment to the said shared network segment and send said first and join request then according to the address information of said multicast source;
If self be not the said first RPF upstream neighbor of carrying in joining request, then abandon said first and join request.
3. according to each described multicast control method in the claim 1～2, it is characterized in that the first via that the secondary route equipment on the said shared network segment receives on the said shared network segment is joined request by first of device forwards, comprising:
Said secondary route equipment receive the said first via by the designated multicast source S of device forwards (S G) joins request, perhaps represent designated multicast group G all multicast sources (* G) joins request.
4. a routing device is characterized in that, said routing device is positioned to be shared on the network segment, and said router comprises:
Receiver module; The first via that is used to receive on the said shared network segment is joined request by first of equipment periodic property transmission; Said first carry said first routing device in joining request reverse path transmit RPF upstream neighbor information, and the address information of multicast source;
The recognition of devices module is used for confirming according to said RPF upstream neighbor information whether self is the RPF upstream neighbor of said first routing device, and confirms according to the address information of said multicast source whether self is the downstream routing device in the said shared network segment;
Request processing module; Be used for confirming certainly as the downstream routing device in the said shared network segment; And receive that the downstream receiving equipments sends second when joining request; Temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request; When said receiver module time receive said first join request or receive that said first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
5. routing device according to claim 4; It is characterized in that; The described request processing module also is used for confirming from as the upper reaches routing device in the said shared network segment time, then judges self whether to be the said first RPF upstream neighbor of carrying in joining request, if self be the said first RPF upstream neighbor of carrying in joining request; Then according to the address information of said multicast source, continue the upper level network segment to the said shared network segment and send said first and join request; If self be not the said first RPF upstream neighbor of carrying in joining request, then abandon said first and join request.
6. according to each described routing device in the claim 4～5, it is characterized in that said first joins request; Comprise: the said first via is by (the S of the designated multicast source S of device forwards; G) join request, perhaps represent designated multicast group G all multicast sources (* G) joins request.
7. a multi-cast system is characterized in that, said system comprises: be positioned at least one first routing device of sharing on the network segment, be positioned at least one the secondary route equipment on the said shared network segment, wherein,
Said first routing device is used for joining request to said secondary route equipment periodic property transmission first, said first carry said first routing device in joining request reverse path transmit RPF upstream neighbor information, and the address information of multicast source;
Said secondary route equipment; Being used to receive said first joins request; When confirming it self is not the RPF upstream neighbor of said first routing device according to said RPF upstream neighbor information; And confirm from the time as the downstream routing device in the said shared network segment according to the address information of said multicast source; Receive then that the downstream receiving equipments sends second join request after, temporary transient will said second not joining request is forwarded to the RPF upstream neighbor that the reception said second according to the singlecast router acquisition joins request; When said secondary route equipment receive once more said first join request or receive that said first routing device sends leave request the time; The RPF upstream neighbor that the reception said second that self obtains according to singlecast router joins request is set to the said first RPF upstream neighbor of carrying in joining request, and the RPF upstream neighbor of in said first joins request, carrying is sent said second and joined request.
8. multi-cast system according to claim 7 is characterized in that, said system also comprises:
Multicast source is used for joining request or the second transmission multicast packet that joins request of secondary route equipment according to first of said first routing device.
9. according to claim 7 or 8 described multi-cast systems; It is characterized in that; Said secondary route equipment also is used for; When confirming according to the address information of said multicast source from as the upper reaches routing device in the said shared network segment, then judge self whether to be the said first RPF upstream neighbor of carrying in joining request, if self be the said first RPF upstream neighbor of carrying in joining request; Then according to the address information of said multicast source, continue the upper level network segment to the said shared network segment and send said first and join request; If self be not the said first RPF upstream neighbor of carrying in joining request, then abandon said first and join request.
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| CN201110034461.7A CN102624604B (en) | 2011-02-01 | 2011-02-01 | Multicast control method, routing equipment and multicast system |
| PCT/CN2011/079003 WO2012103748A1 (en) | 2011-02-01 | 2011-08-26 | Multicast control method, routing device and multicast system |
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| WO2012103748A1 (en) | 2012-08-09 |
| CN102624604B (en) | 2015-01-07 |
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