CN101459596A - Method, system and equipment for multicast data transmission - Google Patents
Method, system and equipment for multicast data transmission Download PDFInfo
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Abstract
The invention provides a method, a system and a device for transmitting multicast data, wherein the method comprises obtaining routing information of a multicast source which is corresponding to multicast data after receiving the multicast data transmitted by the multicast source by a designated router which is directly connected with the multicast source, distributing the routing information of the multicast source to other routers, and utilizing the routing information of the multicast source to form received multicast data transmitted by a multicast distribution tree. Another method comprises judging whether received information of a multicast stream corresponding to the multicast data is recorded or not after receiving the multicast data transmitted by the multicast source, if the receiving information is not recorded, recording the receiving information of the multicast stream corresponding to the multicast data, and transmitting the multicast information, if the receiving information is recorded, and then, judging whether the receiving information of the multicast stream corresponding to the multicast data which are received is consistent with the received information of the multicast stream corresponding to the multicast data which are recorded or not, if the receiving information is consistent, and then, transmitting the multicast data, if not, no transmitting the multicast data. The multicast source is enabled without participating in distributing itself routing messages, and lowers the complexity of the multicast source.
Description
Technical field
The present invention relates to multicasting technology, particularly a kind of method, system and equipment that sends multicast packet.
Background technology
The IP multicast is meant that in IP network certain that packet is sent in the network with the form that transmits (best-effort) as possible determines the node subclass, and this subclass is called multicast group, and the main frame that sends this multicast packet is a multicast source.The IP multicasting technology has solved single-point effectively and has sent the problem that multiple spot receives, in a large number conserve network bandwidth, reduction offered load.
Because it is more and more higher for the reliability requirement of disposing multicast at present, need carry out redundancy backup to multicast source, receiving equipment a plurality of multicast sources promptly is set identical multicast packet is provided, so that after a multicast source lost efficacy, can obtain identical multicast packet from other multicast source.Fig. 1 is a multicast source redundant system structure chart of the prior art, as shown in Figure 1, multicast source 1 and multicast source 2 are two redundant each other multicast sources, be used to send identical multicast packet, to be called Designated Router (DR) with two routers that it directly links to each other respectively, in existing multicast source redundancy scheme, the process that sends multicast packet is mainly: multicast source 1 and multicast source 2 send identical multicast packet to separately DR, multicast source can send to separately DR with self multicast source route by routing information protocol second version (RIPv2), by this DR with the multicast source route distribution that the receives router in the whole network, each router utilizes this multicast distribution tree to send this multicast packet according to this multicast source route construction multicast distribution tree.When multicast source 1 breaks down, can send and cancel routing iinformation, each router in the network receives after this cancels routing iinformation, cancel wherein route to multicast source 1, also exist a route to multicast source 2 can use in the network this moment, and then receiving equipment can continue to receive the multicast packet from multicast source 2.
Yet in the process of transmitting of above-mentioned multicast packet, multicast source need participate in the issuing process of multicast source route, and promptly multicast source need send to the routing iinformation of self the DR router, and this must increase the complexity of multicast source.
Summary of the invention
The embodiment of the invention provides a kind of method, system and equipment that sends multicast packet, so that reduce the complexity of multicast source.
A kind of method that sends multicast packet, this method comprises:
After receiving the multicast packet that this multicast source sends with the direct-connected Designated Router DR of multicast source, obtain the routing iinformation of the multicast source of described multicast packet correspondence, issue the routing iinformation of this multicast source to other router;
Utilize the routing iinformation of this multicast source to make up multicast distribution tree, on the multicast distribution tree of described structure, send the multicast packet that receives.
A kind of system that sends multicast packet, this system comprises: multicast source and with the direct-connected Designated Router DR of this multicast source;
Described multicast source is used for sending multicast packet to described DR;
Described DR after being used to receive the multicast packet of described multicast source transmission, obtains the routing iinformation of the multicast source of this multicast packet correspondence, issues the routing iinformation of this multicast source to other router; Utilize the routing iinformation of this multicast source to make up multicast distribution tree, on the multicast distribution tree of described structure, send the multicast packet that receives.
A kind of router, this router comprises: receiving element, route release unit, distribution tree construction unit and data transmission unit;
Described receiving element is used for the multicast packet that the receiving group source sends;
Described route release unit is used for obtaining and issue to other router the routing iinformation of the multicast source of this multicast packet correspondence after described receiving element receives described multicast packet;
Described distribution tree construction unit is used for making up multicast distribution tree according to the routing iinformation of described multicast source;
Described data transmission unit is used for sending the multicast packet that described receiving element receives on the distribution tree that described distribution tree construction unit makes up.
A kind of method that sends multicast packet, this method comprises:
After receiving the multicast packet of multicast source transmission, judge whether to write down the reception information of the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.
A kind of system that sends multicast packet, this system comprises: multicast source and switch;
Described multicast source is used for sending multicast packet to described switch;
Described switch, after being used to receive the multicast packet of described multicast source transmission, judge the reception information that self whether has write down the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.
A kind of switch, this switch comprises: receiving element, judging unit, record cell and retransmission unit;
Described receiving element is used for the multicast packet that the receiving group source sends;
Described judging unit, be used for judging whether described record cell has write down the reception information of the corresponding multicast data flow of described multicast packet, if do not write down the reception information of the corresponding multicast data flow of described multicast packet, then send the record notice to described record cell, and to described retransmission unit transmission forwarding notice, if write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if consistent, then send and transmit notice to described retransmission unit;
Described record cell when being used to receive the record notice of described judging unit transmission, writes down the reception information of described multicast packet;
Described retransmission unit after being used to receive the forwarding notice of described judging unit transmission, is transmitted described multicast packet.
As can be seen from the above technical solutions, in method, system and the equipment that the embodiment of the invention provides, after receiving the multicast packet that multicast source sends with the direct-connected DR of multicast source, obtain the routing iinformation of the multicast source of this multicast packet correspondence, issue the routing iinformation of this multicast source to other router, utilize the routing iinformation of this multicast source to make up multicast distribution tree, on the multicast distribution tree of described structure, send the multicast packet that receives.The issue of routing iinformation that makes multicast source is by finishing with the direct-connected DR of multicast source, and multicast source only need send multicast packet, does not need to participate in the issue of self routing iinformation, thereby has reduced the complexity of multicast source.
In another kind of method, system and the equipment that the embodiment of the invention provides, after receiving the multicast packet of multicast source transmission, judge whether to write down the reception information of the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.Can be by realizing the operation of above-mentioned multicast data forwarding with the direct-connected switch of multicast source, and this method by only selecting a multicast packet to transmit, can not need the routing iinformation of multicast source is issued, for example, can only utilize the direct-connected interface network segment route of router, can realize the transmission of multicast packet, and multicast source only need send multicast packet, do not need to participate in the issue of self routing iinformation, reduced the complexity of multicast source equally.
Description of drawings
Fig. 1 is a multicast source redundant system structure chart of the prior art;
First kind of network architecture diagram that Fig. 2 provides for the embodiment of the invention;
The first method flow chart that Fig. 3 provides for the embodiment of the invention;
First method flow chart under the PIM-SM pattern that Fig. 4 provides for the embodiment of the invention;
First kind of system construction drawing that Fig. 5 provides for the embodiment of the invention;
The reason device structure chart that Fig. 6 provides for the embodiment of the invention;
Second kind of network architecture diagram that Fig. 7 provides for the embodiment of the invention;
The second method flow chart that Fig. 8 provides for the embodiment of the invention;
Second kind of system construction drawing that Fig. 9 provides for the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
The method of the transmission multicast packet that the embodiment of the invention provides comprises: after receiving the multicast packet of this multicast source transmission with the direct-connected DR of multicast source, obtain the routing iinformation of the multicast source of this multicast packet correspondence, issue the routing iinformation of this multicast source to other router, and utilize the routing iinformation of this multicast source to set up multicast distribution tree, on the multicast distribution tree of described foundation, send the described multicast packet that receives.
Be that example is described in detail said method with framework shown in Figure 2 below.As shown in Figure 2, multicast source 1 and multicast source 2 are redundant each other, and the main frame route of multicast source 1 and multicast source 2 is 1.1.1.1, and its network segment route is 1.1.1.1/24.1 direct-connected DR is a router one with multicast source, and 2 direct-connected DR are router two with multicast source, and its network connects topology as shown in Figure 2.When multicast source did not send any multicast packet, the direct-connected interface network segment route 1.1.1.1/24 of router one and router two issue self was in network, and this part is a prior art, repeats no more.
Utilizing network topology shown in Figure 2 to send the method flow of multicast packet can be as shown in Figure 3, and this method can may further comprise the steps:
Step 301: multicast source 1 and multicast source 2 send multicast packet to router one and router two respectively.
Step 302: after router one and router two received multicast packet, to the routing iinformation of router three and router four transmission multicast source, after promptly router one received the multicast packet of multicast source 1, router one sent the routing iinformation of multicast source 1 to router three respectively; After router two receives the multicast packet of multicast source 2, to the routing iinformation of router three and router four transmission multicast source 2.
Wherein, router one and router two can obtain the routing iinformation of multicast source from the multicast packet that receives.Usually comprise multicast data flow information in the data packet head of multicast packet, and promptly (S, G), wherein, S represents multicast source address, and G represents multicast address.Router one and router two can obtain multicast source address from this multicast data flow information, and according to one of this multicast source address issue than the more accurate multicast source route of self direct-connected interface network segment route, and this multicast source route sent to the router that is connected with self.In addition, also can in router one and router two, dispose the routing iinformation of the multicast source corresponding in advance with this multicast packet, when router one and router two receive multicast packet, can this multicast source route be sent to the router that is connected with self according to pre-configured routing iinformation.
Router one can be identical with the routing iinformation of the multicast source of router two issue, also can be different.At this, be that example is described to issue different routing iinformations.For example, the routing iinformation of the multicast source 1 of router one issue is 1.1.1.1/30, and the routing iinformation of the multicast source 2 of router two issue is 1.1.1.1/32.When router one and router two issue information about multicast source, can issue one than the accurate more multicast source route of the direct-connected interface network segment of router, be example with 30 bitmasks and 32 bitmasks respectively at this.
Step 303: the routing iinformation of router one and router two utilization and this multicast source makes up multicast distribution tree.
In this step, router one and router two utilize the routing iinformation of this multicast source to carry out alternately to message and other router that other router sends the structure multicast distribution tree, thereby make up multicast distribution tree.The process of the structure multicast distribution tree that relates in the embodiment of the invention all is to utilize the routing iinformation and other router that self obtain to carry out alternately, thereby makes up multicast distribution tree, repeats no more in the following description.
Step 304: after other router receives the multicast source routing iinformation, select one of them to make up multicast distribution tree, and the multicast source routing iinformation that continues to select sends to the next hop router that links to each other with self, until sending to last-hop Router.
For example, after router three receives the routing iinformation of the multicast source that router one and router two send, select one of them, utilize the routing iinformation of the multicast source of this selection to make up multicast distribution tree, and the routing iinformation that continues the multicast source that will select sends to router four and the router five that links to each other with self, other router is carried out and the router three identical operations after receiving the routing iinformation of this multicast source, until sending to receiving equipment.
Receive the routing iinformation of the multicast source that hop router sends on it at each router after, can be according to longest match principle, select the routing iinformation of a longest multicast source of mask-length, for example, the routing iinformation that this multicast packet is relevant is inquired about, when the route that can inquire coupling is 1.1.1.0/24,1.1.1.1/30 and 1.1.1.1/32, can select the longest 1.1.1.1/32 of mask-length; The router hops that comprises in also can routing iinformation according to this multicast source, select the routing iinformation of the minimum multicast source of jumping figure, like this can be so that the transmission path of multicast packet is shorter, for example, router four can receive the routing iinformation of the multicast source of router two and router three transmission, when selecting,, therefore can select the routing iinformation of the multicast source of router two transmission because the routing iinformation of the multicast source that router two sends is minimum apart from the jumping figure of multicast source; Also can choose the routing iinformation of one of them multicast source wantonly.
Each router makes up in multicast distribution tree and the step 304 step that sends the routing iinformation of multicast source to the next hop router that is attached thereto in the step 303 not have the sequencing fixed.
Step 305: each router sends the multicast packet that receives on the multicast distribution tree that self makes up, until multicast packet is sent to receiving equipment.
Router one and router two self are participating in sending the multicast packet that receives on the multicast distribution tree that makes up.Other router is also carried out this step after receiving multicast packet, promptly sends the multicast packet that receives on the multicast distribution tree that self makes up, until multicast packet is sent to receiving equipment.
Step 306: when router one detects multicast source 1 and breaks down, cancel the routing iinformation of own this multicast source 1 of in network, issuing.After each router detection is cancelled the routing iinformation of multicast source 1 to router one, all make up multicast distribution tree again, and on this multicast distribution tree that rebuilds, receive, send multicast packet.
Wherein, DR detect that multicast source breaks down can be in the following manner:
1, the multicast traffic stream in DR timing monitoring group broadcasting source if do not receive multicast traffic stream in the time of setting, determines that then this multicast source breaks down.
2, whether DR breaks down by mutual signaling perception multicast source, for example, can send the heartbeat signaling to multicast source, if setting the response that does not receive the multicast source answer in the time limit, determines that then this multicast source breaks down.
3, DR determines by the Link State cognition technology whether multicast source breaks down.Usually Link State can be divided into normally (Up) state and fault (Down) state, if Link State is Down, determines that then this multicast source breaks down.Whether be in prior art existing technology, do not repeat them here by Link State perception multicast source if breaking down.
In this step, router one is cancelled the routing iinformation of own this multicast source 1 of issuing in network can be by issuing a routing iinformation again to other router, the routing iinformation that no longer comprises multicast source 1 in this routing iinformation of issuing again, also can issue a routing iinformation again, routing iinformation metric (Metric) maximum of the multicast source 1 that comprises in this routing iinformation of issuing again also can be cancelled the routing iinformation of this multicast source 1 by alternate manner.After other router receives the routing iinformation of cancelling multicast source 1, reselect the route of the multicast source of this multicast packet correspondence, and rebuild multicast distribution tree, on the multicast distribution tree that rebuilds, send multicast packet, thereby realize the switching of multicast tree.
When adopting said method, the convergence time that fault occurs to the transmission that recovers multicast packet is multicast source fault detecting period and network routing convergence time sum, and this fault occurs to the convergence time of the transmission that recovers multicast packet less than 200 milliseconds usually.
Method flow shown in Figure 3 is described is that multicast packet under general mode sends process, when in Protocol Independent Multicast-Sparse Mode (PIM-SM) pattern following time, DR need send to a fixing multicast convergent point (RP) with multicast packet by logon message, receiving equipment also can send to RP and join message, after RP receives multicast packet, multicast packet is sent to receiving equipment, and in the method flow shown in Figure 3, each router can send to all next hop routers with multicast packet by whole outbound ports.Be example with framework shown in Fig. 2 still, suppose that router four is RP, Fig. 4 is for adopting the method flow diagram under the PIM-SM pattern, and as shown in Figure 4, this method can may further comprise the steps:
Step 401 is with step 301.
Step 402 is with step 302.In this step, after router one and router two receive multicast packet, need issue corresponding multicast source routing iinformation by other router in network equally.
Because router one and router two need send to RP with the multicast packet that receives, for fear of RP two parts of multicast packets are all sent to receiving equipment, cause the data of receiving equipment to repeat, router one can be issued different multicast source DR routes with router two, for example, router one can send the routing iinformation of the 1.1.1.2/32 of self, and router two can send the routing iinformation of the 1.1.1.3/32 of self.
Step 403: router one and router two send to router four by logon message with multicast packet, i.e. RP.
Step 404:RP utilizes the routing iinformation of the multicast source that receives and the joining message of receiving equipment that receives to set up multicast distribution tree.
Above-mentioned steps 403 and step 404 do not have fixing sequencing, can carry out simultaneously yet.
This RP can determine to send outbound port information and the path of multicast packet to receiving equipment, and can utilize the routing iinformation of multicast source and definite outbound port information and path to set up multicast distribution tree after receiving joining message of receiving equipment transmission.
After step 405:RP receives logon message, select the logon message of one of them this multicast packet, and on the multicast distribution tree of setting up, send multicast packet to receiving equipment.
Select the method for one of them logon message to be in this step: to observe announced route, if have the multicast source DR route and the source address matches of logon message therewith in the announced route, then transmit logon message, the logon message in other source is abandoned from this multicast source DR.After the multicast source DR route that exists in the route of an issue is cancelled, stop forwarding logon message from this multicast source DR, after this, for the logon message that derives from other multicast source DR, if there is this multicast source DR route in the announced route, and the source address matches of logon message is then transmitted the logon message from this multicast source DR therewith.
Step 406:RP sends stopped registration messages to router one and router two, and notice router one and router two stop to send logon message.
In this step, RP is with the source address of the logon message destination address as stopped registration messages, for example, if the source address of logon message is 1.1.1.2, the coupling route that then finds has: 1.1.1.0/24 and 1.1.1.2/32, then can utilize 1.1.1.2/32 that stopped registration messages is sent to router one according to longest match principle.
Step 407: after multicast packet that RP will send by logon message sent to receiving equipment, each router was revised the multicast distribution tree that RP makes up, and it is essential through RP that later multicast data delivery path is not needed.Each router carries out the transmission of multicast packet by revised multicast distribution tree.
This step is identical with multicast distribution tree makeover process of the prior art, does not repeat them here.
Step 408 is with step 306.Operation when promptly detecting multicast source transmission fault is identical.
In the said method, be the description that example is carried out all, certainly to have a plurality of redundant multicast sources, when having only a multicast source, can adopt above-mentioned method flow equally, just each router need not to select one from the routing iinformation of a plurality of multicast sources, and other method flow is identical.
The system construction drawing that Fig. 5 provides for the embodiment of the invention, as shown in Figure 5, this system can comprise: multicast source 500 and with the direct-connected DR 600 of this multicast source.
Multicast source 500 is used for sending multicast packet to DR 600.
Wherein, DR 600, when also being used to detect multicast source 500 and breaking down, cancel the routing iinformation to the multicast source 500 of other router issue.
When adopting the PIM-SM pattern, this system can also comprise: RP 700.
Wherein, the structure of DR 600 can be as shown in Figure 6, and this DR 600 can comprise: receiving element 601, route release unit 602, distribution tree construction unit 603 and data transmission unit 604.
Receiving element 601 is used for the multicast packet that the receiving group source sends.
Distribution tree construction unit 603 is used for making up multicast distribution tree according to the routing iinformation of this multicast source.
Wherein, route release unit 602 can comprise: route acquisition unit 6021 and route transmitting element 6022.
Route transmitting element 6022 is used to issue the routing iinformation of the multicast source that route acquisition unit 6021 generates or obtain.
This DR 600 also comprises: whether fault detection unit 605 is used to detect multicast source and breaks down.
Wherein, whether the transmitting messages of the multicast traffic stream that fault detection unit 605 can be by timing monitoring group broadcasting source is accused multicast source and is broken down, if do not receive multicast traffic stream in the time of setting, determines that then this multicast source breaks down; Can also detect multicast source by the method that sends the heartbeat signaling to multicast source and whether break down,, determine that then this multicast source breaks down if in setting-up time, do not receive the response that this multicast source is replied; Whether if, perceive Link State be fault Down state, determine that then this multicast source breaks down if can also detect multicast source by the Link State cognition technology and break down.
This route release unit 602 can be by issuing a routing iinformation again to other router, the routing iinformation that no longer comprises multicast source in this routing iinformation of issuing again, also can issue a routing iinformation again, the routing iinformation that comprises this multicast source route Metric maximum in this routing iinformation of issuing again also can be cancelled the routing iinformation of this multicast source 1 by alternate manner.
Above-mentioned receiving element 601, fault detection unit 605 can be the multicast module in the router, and route release unit 602 can be the clean culture module in the router.
This DR 600 can also comprise: logon message Transmit-Receive Unit 606, the data message that is used for receiving element 601 is received sends to multicast convergent point RP by logon message, receive the stopped registration messages that RP sends after, stop to send logon message to this RP.
Solution when more than all adopting the mode of straight chain to be connected with router for redundant each other multicast source, when redundant each other multicast source is connected with router by same switch, the method that the embodiment of the invention provides comprises: after receiving the multicast packet of multicast source transmission, judge whether to write down the reception information of the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.
Wherein, the reception information of this multicast packet of record can be that the data of the corresponding multicast data flow of multicast packet enter interface (IIF), also can be the special mark information etc. of the corresponding multicast data flow of multicast packet.
Fig. 7 is the Organization Chart of redundant each other multicast source when being connected with router by same switch, as shown in Figure 7, multicast source 1 all is connected with route 2 with router one by same switch with multicast source 2, at this moment, can adopt flow process as shown in Figure 8, this method can may further comprise the steps:
Step 801: multicast source 1 and multicast source 2 send multicast packet to switch.
Step 802: switch receives the multicast packet of multicast source 1 first, then judges the IIF that self whether has write down the corresponding multicast data flow of this multicast packet.Because switch receives the multicast packet of multicast source 1 first, therefore, self does not write down the IIF of this multicast packet as yet, then switch writes down the IIF of this multicast packet, for example, switch receives this multicast packet from inlet Port 1, then writes down this Port1, promptly the IIF of the corresponding multicast data flow of this multicast packet is Port 1, and gives router one and router two with the transmitting multicast data of multicast source 1.
Step 803: switch receives the multicast packet of multicast source 2, judges the IIF that self whether has write down the corresponding multicast data flow of this multicast packet.Because switch has formerly write down the IIF of the corresponding multicast data flow of multicast packet of multicast source 1 transmission, therefore, and the corresponding identical multicast data flow of multicast packet of multicast source 1 and multicast source 2 transmissions, therefore, judge the IIF that self has write down the corresponding multicast data flow of this multicast packet, whether the IIF that further judges the corresponding multicast data flow of this multicast packet is consistent with the IIF of the multicast data flow of this multicast packet correspondence that writes down, the IIF that supposes the multicast data flow of the multicast packet correspondence that this multicast source 2 sends is Port 2, and the IIF of the multicast data flow of this multicast packet correspondence of record is Port 1, therefore, refusal is transmitted the multicast packet that this multicast source 2 sends.
If switch receives the multicast packet of multicast source 1 once more, still need to judge the IIF that self whether has write down the corresponding multicast data flow of this multicast packet, because, write down the IIF of the corresponding multicast data flow of this multicast packet, need then to judge whether the IIF of the corresponding multicast data flow of this multicast packet is consistent with the IIF of the corresponding multicast data flow of this multicast packet that writes down, because the inlet of multicast source 1 is Port 1, the IIF of this multicast packet correspondence of record is Port 1, at this moment, transmit the multicast packet that this multicast source 1 sends.
Step 804: after router one and router two receive the multicast packet of switch forwarding, this multicast packet is continued to transmit in network, until being forwarded to receiving equipment.
In this step, the network segment route that router one and router two can be direct-connected with self is issued to other router, and utilizes this network segment route construction multicast distribution tree, multicast data forwarding on the multicast distribution tree of this structure.This step is a prior art, does not repeat them here.
Step 805: after switch detects multicast source 1 and breaks down, cancel the IIF of this multicast packet of record.At this moment, after receiving the multicast packet of multicast source 2, judge the IIF that self has not write down the corresponding multicast data flow of this multicast packet, then write down the IIF of the corresponding multicast data flow of multicast packet of multicast source 2, for example, switch receives this multicast packet from inlet Port 2, then writes down this Port 2, and promptly the IIF of the corresponding multicast data flow of this multicast packet is Port 2 and transmits this multicast packet.Thereby realize switching of multicast source redundancy backup.
In this step, switch detects method that multicast source 1 breaks down equally can be in the following ways:
1, the multicast traffic stream in switch timing monitoring group broadcasting source if do not receive multicast traffic stream in the time of setting, determines that then this multicast source breaks down.
2, whether switch breaks down by mutual signaling perception multicast source, for example, can send the heartbeat signaling to multicast source, if setting the response that does not receive the multicast source answer in the time limit, determines that then this multicast source breaks down.
3, switch determines by the Link State cognition technology whether multicast source breaks down.Usually Link State can be divided into normally (Up) state and fault (Down) state, if Link State is Down, determines that then this multicast source breaks down.
When adopting the described method of Fig. 8, the convergence time that fault occurs to the transmission that recovers multicast packet is a multicast source fault detecting period, and this fault occurs to the convergence time of the transmission that recovers multicast packet less than 200 milliseconds usually.
The another kind of system construction drawing that Fig. 9 provides for the embodiment of the invention, this system can be used to realize flow process shown in Figure 8, as shown in Figure 9, this system can comprise: multicast source 900 and switch 910.
Multicast source 900 is used for sending multicast packet to switch 910.
Switch 910, after being used to receive the multicast packet of multicast source 900 transmissions, judge the reception information that self whether has write down the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.
This switch 910 after can also being used to detect described multicast source and breaking down, is cancelled the reception information of multicast packet of this multicast source of record.
Wherein, switch 910 can comprise: receiving element 911, judging unit 912, record cell 913 and retransmission unit 914.
Receiving element 911 is used for the multicast packet that receiving group source 900 sends.
Judging unit 912, be used for judging whether record cell 913 has write down the reception information of the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then send the record notice to record cell 913, and to retransmission unit 914 transmission forwarding notices, if write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if consistent, then send and transmit notice to described retransmission unit.
Record cell 913 when being used to receive the record notice of judging unit 912 transmissions, writes down the reception information of this multicast packet.
Retransmission unit 914 after being used to receive the forwarding notice of judging unit 912 transmissions, is transmitted this multicast packet.
This switch 910 can also comprise: fault detection unit 915, be used for after detecting multicast source and breaking down, and send waiving of notice to record cell 913.
Record cell 913 also is used for after receiving waiving of notice, cancels the reception information of the multicast packet of this multicast source that breaks down.
In the such scheme, not only be suitable for two redundant each other multicast sources, and, also be suitable for only having the situation of a multicast source, or a plurality of situations of redundant multicast source are each other arranged.
By above description as can be seen, the method, system and the equipment that provide of the embodiment of the invention has the following advantages:
1, in first method, system and the equipment that the embodiment of the invention provides, after receiving the multicast packet that multicast source sends with the direct-connected DR of multicast source, obtain the routing iinformation of the multicast source of this multicast packet correspondence, issue the routing iinformation of this multicast source to other router, utilize the routing iinformation of this multicast source to make up multicast distribution tree, on the multicast distribution tree of described structure, send the multicast packet that receives.The issue of routing iinformation that makes multicast source is by finishing with the direct-connected DR of multicast source, and multicast source only need send multicast packet, does not need to participate in the issue of self routing iinformation, thereby has reduced the complexity of multicast source.
In the second method that the embodiment of the invention provides, system and the equipment, after receiving the multicast packet of multicast source transmission, judge whether to write down the reception information of the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.Can be by realizing the operation of above-mentioned multicast data forwarding with the direct-connected switch of multicast source, and this method by only selecting a multicast packet to transmit, can not need the routing iinformation of multicast source is issued, for example, can only utilize the direct-connected interface network segment route of router, can realize the transmission of multicast packet, and multicast source only need send multicast packet, do not need to participate in the issue of self routing iinformation, reduced the complexity of multicast source equally.
2, the first method, system and the equipment that provide of the embodiment of the invention, the clean culture module that can utilize router to carry, it is the singlecast router function, need not complex modifications, can pass through unicast routing protocol, agreements such as RIP, OSPF, ISIS, BGP for example, the routing iinformation of issue multicast source is simple, realize easily.
3, in the first method that the embodiment of the invention provides, under the PIM-SM pattern, the DR direct-connected with multicast source can also issue the multicast source DR routing iinformation of self, the direct-connected DR of active and standby multicast source issues different multicast source DR routing iinformations respectively, RP can utilize this difference multicast source DR routing iinformation, from the logon message of same multicast data, select one and set up multicast distribution tree, thereby can eliminate the repeating groups multicast data that sends by logon message.
4, in the embodiment of the invention, provide the method that can the fast detecting multicast source breaks down, can cancel route fast, postponed for a short time, convergence is fast.
5, in the embodiment of the invention, can be by the routing iinformation of DR router issue multicast source, each router is for the routing iinformation of a plurality of multicast sources of same multicast packet, only select one of them multicast source routing iinformation to make up multicast distribution tree, and the IIF that writes down multicast packet by switch, only select a multicast packet to transmit, thereby avoided the repeat replication of multicast packet effectively.
6, in the embodiment of the invention, IIF by record multicast packet on switch, after multicast source breaks down, cancel the IIF of the multicast packet of this multicast source transmission immediately, make behind the multicast packet that receives redundant multicast source transmission, can switch immediately, transmit the multicast packet that this redundancy multicast source sends, thereby make when the multicast source of redundancy backup passes through the switch access network each other, can realize the quick switching of multicast packet backup equally.
7, in the embodiment of the invention route of the multicast source of router issue so long as mask-length promptly can realize greater than network segment route mask-length, multicast source only can be issued self main frame route of 32 bitmask length in the prior art of comparing, and has higher flexibility.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (27)
1, a kind of method that sends multicast packet is characterized in that, this method comprises:
After receiving the multicast packet that this multicast source sends with the direct-connected Designated Router DR of multicast source, obtain the routing iinformation of the multicast source of described multicast packet correspondence, issue the routing iinformation of this multicast source to other router;
Utilize the routing iinformation of this multicast source to make up multicast distribution tree, on the multicast distribution tree of described structure, send the multicast packet that receives.
2, method according to claim 1, it is characterized in that, obtain the routing iinformation of the multicast source of described multicast packet correspondence, routing iinformation from this multicast source to other router that issue comprises: described DR obtains the multicast source address that described multicast packet carries, and issues than the more accurate multicast source route of self direct-connected interface network segment route to other router according to this multicast source address; Perhaps,
Described DR obtains the routing iinformation of the pre-configured multicast source corresponding with described multicast source address, to the routing iinformation of other router issue multicast source corresponding with described multicast source address.
3, method according to claim 1, it is characterized in that, described routing iinformation from this multicast source to other router that issue comprises: described DR sends to the next hop router that links to each other with self with the routing iinformation of this multicast source, after other router except DR receives the routing iinformation of this multicast source, all send the routing iinformation of this multicast source, until last-hop Router to the next hop router that self links to each other.
4, method according to claim 3 is characterized in that, this method also comprises: the routing iinformation of the multicast source that described other router utilization receives makes up multicast distribution tree, and sends the multicast packet that receives on the multicast distribution tree of this structure.
5, method according to claim 4, it is characterized in that, the routing iinformation of the multicast source that described other router utilization receives makes up multicast distribution tree and comprises: if when described other router receives the routing iinformation of a plurality of multicast sources of same multicast packet correspondence, select the routing iinformation of a longest multicast source of mask-length, perhaps, selection comprises the routing iinformation of a minimum multicast source of router hops, perhaps, select the routing iinformation of a multicast source arbitrarily, utilize the routing iinformation of a multicast source of described selection to make up multicast distribution tree.
6, method according to claim 1 is characterized in that, this method also comprises: when described DR detects described multicast source and breaks down, cancel self routing iinformation to this multicast source of other router issue; Other router detection rebuilds multicast distribution tree after cancelling the routing iinformation of this multicast source to described DR, and sends the multicast packet that receives on this multicast distribution tree that rebuilds.
7, method according to claim 6, it is characterized in that, described DR detects described multicast source and breaks down and comprise: DR is the multicast traffic stream in monitoring group broadcasting source regularly, if do not receive multicast traffic stream in the time of setting, determines that then this multicast source breaks down; Perhaps,
DR sends the heartbeat signaling to multicast source, if do not receive the response that this multicast source is replied in setting-up time, determines that then this multicast source breaks down; Perhaps,
DR is fault Down state by the Link State cognition technology if perceive Link State, determines that then this multicast source breaks down.
8, method according to claim 6, it is characterized in that, described cancelling comprises to the routing iinformation of this multicast source of other router issue self: issue a routing iinformation again to other router, do not comprise the described multicast source routing iinformation that will cancel in this routing iinformation of issuing again; Perhaps issue a described multicast source routing iinformation that comprises this multicast source route metric value Metric maximum again to other router;
Described other router detection is behind the routing iinformation of cancelling this multicast source, rebuilding multicast distribution tree comprises: described other router detection is behind the described routing iinformation of cancelling this multicast source, reselect the route of the multicast source of this multicast packet correspondence, utilize the described multicast source route construction multicast distribution tree of reselecting.
9, method according to claim 1, it is characterized in that, this method also comprises: multicast aggregation node RP utilizes the routing iinformation of the multicast source that receives and the structure multicast distribution tree that joins message that receiving equipment sends after receiving the routing iinformation of multicast source of described DR issue.
10, method according to claim 9, it is characterized in that, this method also comprises: described DR sends the logon message that comprises multicast packet to described RP, after described RP receives this logon message, sends described multicast packet on the multicast distribution tree that self makes up.
11, method according to claim 10 is characterized in that, also comprises after described transmission multicast packet: described RP sends stopped registration messages to described DR and indicates described DR to stop to send logon message.
12, method according to claim 10, it is characterized in that, after a plurality of logon messages that described RP receives same multicast packet carry the routing iinformation of different multicast sources, select one of them logon message, and on the multicast distribution tree that makes up, send the multicast packet that comprises in the logon message of described selection.
13, a kind of system that sends multicast packet is characterized in that, this system comprises: multicast source and with the direct-connected Designated Router DR of this multicast source;
Described multicast source is used for sending multicast packet to described DR;
Described DR after being used to receive the multicast packet of described multicast source transmission, obtains the routing iinformation of the multicast source of this multicast packet correspondence, issues the routing iinformation of this multicast source to other router; Utilize the routing iinformation of this multicast source to make up multicast distribution tree, on the multicast distribution tree of described structure, send the multicast packet that receives.
14, system according to claim 13 is characterized in that, described DR when also being used to detect described multicast source and breaking down, cancels the routing iinformation to the described multicast source of other router issue.
15, system according to claim 13 is characterized in that, this system also comprises: multicast aggregation node RP;
Described DR also is used for sending the logon message that comprises multicast packet to described RP, receive the stopped registration messages that described RP sends after, stop to send the logon message that comprises multicast packet to described RP;
Described RP, be used to utilize the routing iinformation of multicast source of described DR issue and the structure multicast distribution tree that joins message that receiving equipment sends, after receiving the logon message of described DR transmission, on the multicast distribution tree that self makes up, send the multicast packet that described logon message comprises, send stopped registration messages to described DR.
16, a kind of router is characterized in that, this router comprises: receiving element, route release unit, distribution tree construction unit and data transmission unit;
Described receiving element is used for the multicast packet that the receiving group source sends;
Described route release unit is used for obtaining and issue to other router the routing iinformation of the multicast source of this multicast packet correspondence after described receiving element receives described multicast packet;
Described distribution tree construction unit is used for making up multicast distribution tree according to the routing iinformation of described multicast source;
Described data transmission unit is used for sending the multicast packet that described receiving element receives on the distribution tree that described distribution tree construction unit makes up.
17, router according to claim 16 is characterized in that, described route release unit comprises: route acquisition unit and route transmitting element;
Described route acquisition unit, be used to obtain the multicast source address that described multicast packet carries, and generate than the more accurate multicast source routing iinformation of self direct-connected interface network segment route according to this multicast source address, perhaps, obtain the routing iinformation of the pre-configured multicast source corresponding with described multicast source address;
Described route transmitting element is used to issue the routing iinformation of the multicast source that described route acquisition unit generates or obtain.
18, router according to claim 16 is characterized in that, this router also comprises: whether fault detection unit is used to detect described multicast source and breaks down;
Described route release unit also is used for detecting multicast source when breaking down at described fault detection unit, cancels self routing iinformation to this multicast source of other router issue.
19, router according to claim 16, it is characterized in that, this router also comprises: the logon message Transmit-Receive Unit, the data message that is used for described receiving element is received sends to multicast convergent point RP by logon message, after receiving the stopped registration messages of RP transmission, stop to send logon message to described RP.
20, a kind of method that sends multicast packet is characterized in that, this method comprises:
After receiving the multicast packet of multicast source transmission, judge whether to write down the reception information of the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.
21, method according to claim 20 is characterized in that, the reception information of the corresponding multicast data flow of described multicast packet comprises: the data of the corresponding multicast data flow of multicast packet enter interface IIF.
22, method according to claim 1 is characterized in that, this method also comprises: after detecting described multicast source and breaking down, cancel the reception information of multicast packet of this multicast source of record.
23, method according to claim 22, it is characterized in that, detecting described multicast source breaks down and comprises: the multicast traffic stream in monitoring group broadcasting source regularly, if in the time of setting, do not receive multicast traffic stream, determine that then this multicast source breaks down; Perhaps,
Send the heartbeat signaling to multicast source,, determine that then this multicast source breaks down if in setting-up time, do not receive the response that this multicast source is replied; Perhaps,
By the Link State cognition technology, be fault Down state if perceive Link State, determine that then this multicast source breaks down.
24, a kind of system that sends multicast packet is characterized in that, this system comprises: multicast source and switch;
Described multicast source is used for sending multicast packet to described switch;
Described switch, after being used to receive the multicast packet of described multicast source transmission, judge the reception information that self whether has write down the corresponding multicast data flow of this multicast packet, if do not write down the reception information of the corresponding multicast data flow of this multicast packet, then write down the reception information of the corresponding multicast data flow of this multicast packet, and transmit this multicast packet; If write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if it is consistent, then transmit this multicast packet, if inconsistent, then do not transmit this multicast packet.
25, system according to claim 24 is characterized in that, described switch after also being used to detect described multicast source and breaking down, is cancelled the reception information of multicast packet of this multicast source of record.
26, a kind of switch is characterized in that, this switch comprises: receiving element, judging unit, record cell and retransmission unit;
Described receiving element is used for the multicast packet that the receiving group source sends;
Described judging unit, be used for judging whether described record cell has write down the reception information of the corresponding multicast data flow of described multicast packet, if do not write down the reception information of the corresponding multicast data flow of described multicast packet, then send the record notice to described record cell, and to described retransmission unit transmission forwarding notice, if write down the reception information of the corresponding multicast data flow of this multicast packet, the reception information of then judging the corresponding multicast data flow of the described multicast packet that receives the whether reception information with the corresponding multicast data flow of multicast packet of described record is consistent, if consistent, then send and transmit notice to described retransmission unit;
Described record cell when being used to receive the record notice of described judging unit transmission, writes down the reception information of described multicast packet;
Described retransmission unit after being used to receive the forwarding notice of described judging unit transmission, is transmitted described multicast packet.
27, switch according to claim 26 is characterized in that, this switch also comprises: fault detection unit is used for sending waiving of notice to described record cell after detecting multicast source and breaking down;
Described record cell also is used for after receiving waiving of notice, cancels the reception information of the multicast packet of the described multicast source that breaks down.
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| CN101789900B (en) * | 2009-11-19 | 2012-08-15 | 福建星网锐捷网络有限公司 | Multicast forwarding route query method, intermediate node and management node |
| CN102932248A (en) * | 2012-10-29 | 2013-02-13 | 中兴通讯股份有限公司 | Method and device for multi-source multicast path backup and rendezvous point (RP) |
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| CN109039902A (en) * | 2018-07-24 | 2018-12-18 | 新华三技术有限公司 | A kind of retransmission method and device of multicast message |
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| CN100477635C (en) * | 2005-09-08 | 2009-04-08 | 杭州华三通信技术有限公司 | Transmission method and edge apparatus for multicast between fields |
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| CN101789900B (en) * | 2009-11-19 | 2012-08-15 | 福建星网锐捷网络有限公司 | Multicast forwarding route query method, intermediate node and management node |
| CN102932248A (en) * | 2012-10-29 | 2013-02-13 | 中兴通讯股份有限公司 | Method and device for multi-source multicast path backup and rendezvous point (RP) |
| CN102970231A (en) * | 2012-11-20 | 2013-03-13 | 中兴通讯股份有限公司 | Multicast flow forwarding implementation method and routing bridge (RB) |
| CN102970231B (en) * | 2012-11-20 | 2018-05-01 | 中兴通讯股份有限公司 | Multicast data flow forwards implementation method and route-bridge（RB） |
| CN103974202A (en) * | 2014-05-28 | 2014-08-06 | 苏州鸣伦电子科技有限公司 | Multicast-tree-based code dispatching method for power demand side acquisition node |
| CN109039902A (en) * | 2018-07-24 | 2018-12-18 | 新华三技术有限公司 | A kind of retransmission method and device of multicast message |
| CN109218180A (en) * | 2018-08-24 | 2019-01-15 | 刘昱 | Multicast control method and device based on Local Area Network |
| CN112104560A (en) * | 2020-07-27 | 2020-12-18 | 深圳市风云实业有限公司 | Method for customizing multicast path |
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