CN102986178A - Multicast forwarding method and multicast forwarding device in sparse mode protocol-independent multicast - Google Patents
Multicast forwarding method and multicast forwarding device in sparse mode protocol-independent multicast Download PDFInfo
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- CN102986178A CN102986178A CN2011800012060A CN201180001206A CN102986178A CN 102986178 A CN102986178 A CN 102986178A CN 2011800012060 A CN2011800012060 A CN 2011800012060A CN 201180001206 A CN201180001206 A CN 201180001206A CN 102986178 A CN102986178 A CN 102986178A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/16—Multipoint routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
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Abstract
The embodiment of the invention discloses a multicast forwarding method and multicast forwarding equipment in sparse mode protocol independent multicast, relates to internet protocol multicast communication, and aims to solve the problem of multicast data flooding of two-layer equipment. The technical scheme of the invention comprises the following steps: receiving multicast data sent by a multicast source; and searching the constructed multicast forwarding table entry, and forwarding the multicast data according to the constructed multicast forwarding table entry if the constructed multicast forwarding table entry is searched. The embodiment of the invention is used for multicast communication.
Description
Multicast forward method and multicast forwarding equipment technical field in Protocol Independent Multicast-Sparse Mode
The present invention relates to the multicast forward method in the communications field, more particularly to Protocol Independent Multicast-Sparse Mode and multicast forwarding equipment.
Background technology
PIM-SM (Protocol independent multicast-sparse mode, Protocol Independent Multicast-Sparse Mode) belongs to the multicast routing protocol of sparse mode.PIM-SM is a kind of agreement for realizing IP (Internet Protocol) multicast.
Under PIM-SM agreements, multicast source generally requires to get to the IP network equipments by two-layer network device, but in the prior art, two-layer network device, which is generally required, is given to all nodes by flux of multicast and gets to the IP network equipments, can so cause flux of multicast to flood.The content of the invention
One aspect of the present invention provides a kind of multicast forward method and multicast forwarding equipment in Protocol Independent Multicast-Sparse Mode, can solve the problem that the problem of two-layer equipment multicast packet is flooded.
To reach above-mentioned purpose, one aspect of the present invention is adopted the following technical scheme that：
A kind of multicast forward method in Protocol Independent Multicast-Sparse Mode, including：The multicast packet that multicast source is sent is received with the two-layer equipment that multicast source is joined directly together；Described to search the multicast forwarding list item built with the two-layer equipment that multicast source is joined directly together, if finding the multicast forwarding list item built, the multicast forwarding list item built according to is forwarded to the multicast packet.
One aspect of the present invention also provides a kind of multicast forwarding equipment, and it includes,
Multicast data reception unit, the multicast packet for receiving multicast source transmission；
Memory cell, for storing the multicast forwarding list item built；
Searching unit, the multicast forwarding list item built for being searched from the memory cell；Retransmission unit, for the searching unit find it is described built multicast forwarding list item when, the multicast packet is forwarded according to the multicast forwarding list item built.
Multicast forward method in the Protocol Independent Multicast-Sparse Mode that one aspect of the present invention is provided
In multicast forwarding equipment, when receiving the multicast packet that multicast source is sent, the problem of multicast packet is flooded is can solve the problem that come corresponding multicast data forwarding by searching the multicast forwarding list item built, and according to the multicast forwarding list item built, the network bandwidth is saved.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, the required accompanying drawing used in embodiment or description of the prior art will be briefly described below, apparently, drawings in the following description are only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the multicast forward method embodiment in Protocol Independent Multicast-Sparse Mode of the present invention；
Fig. 2 is the detail flowchart that multicast forwarding list item is built in the multicast forward method embodiment in Protocol Independent Multicast-Sparse Mode of the present invention；
Fig. 3 is the block diagram of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention；
Fig. 4 is another block diagram of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention；
Fig. 5 is the block diagram of the forwarding-table item construction unit of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention.
Embodiment
For a better understanding of the present invention and enable the invention to easy to implement.Below in conjunction with the accompanying drawings and specific embodiment the present invention will be described in detail.
With reference to Fig. 1, the embodiment of the present invention provides a kind of multicast forward method in Protocol Independent Multicast-Sparse Mode, including：
S1:The multicast packet that multicast source is sent is received with the two-layer equipment that multicast source is joined directly together；Wherein, the two-layer equipment being joined directly together with multicast source includes all working the second layer in 0SI (open system interconnection, Open System Interconnect) seven layer model（That is data link layer）On equipment, such as Layer 2 switch；Similarly, three-layer equipment includes all working the third layer in 0SI seven layer models（That is Internet）On equipment,
Such as router；
S 2 :Described to search the multicast forwarding list item built with the two-layer equipment that multicast source is joined directly together, if finding the multicast forwarding list item built, the multicast forwarding list item built according to is forwarded to the multicast packet；
During forwarding, by the two-layer equipment being joined directly together with multicast source next two-layer equipment is given according to the multicast forwarding list item built by the transmitting multicast data, next two-layer equipment continues to carry out forwarding according to the multicast forwarding list item built until reaching convergent point router, is then continued to transmit multicast packet by the convergent point router.
The embodiment of the present invention is when receiving the multicast packet that multicast source is sent, by searching the multicast forwarding list item built, and the problem of multicast packet is flooded can solve the problem that come corresponding multicast data forwarding according to the multicast forwarding list item built, save the network bandwidth.
In one embodiment, the multicast forward method also includes：It is described to search the multicast forwarding list item built with the two-layer equipment that multicast source is joined directly together, if not finding the multicast forwarding list item built, the multicast packet is then packaged into Protocol Independent Multicast logon message, and according to the convergent point router address of inside configuration, to Protocol Independent Multicast logon message described in the convergent point router unicast, to notify the multicast source to exist.
Wherein, the multicast packet is packaged into during Protocol Independent Multicast logon message in the two-layer equipment being joined directly together with multicast source, the two-layer equipment Zhi Jie Lost being joined directly together with multicast source are abandoned per the multicast packet received by the multicast packet is packaged into twice between Protocol Independent Multicast logon message.And packaged Protocol Independent Multicast logon message is periodically sent to the convergent point router by described with the two-layer equipment that multicast source is joined directly together.
The embodiment of the present invention to convergent point router unicast protocol independent multicast logon message, forwards without flooding when not finding the multicast forwarding list item built, can solve the problem that the problem of multicast packet is flooded, save the network bandwidth.
Further, after Protocol Independent Multicast logon message described in the two-layer equipment to the convergent point router unicast being joined directly together with multicast source, multicast group request message is added when there is recipient to be sent to the convergent point router（For example, I GMP (Internet Group Management Protocols）Request message）When, the step of multicast forward method also includes building the multicast forwarding list item of the recipient.
The step of describing to build multicast forwarding list item in multicast forward method embodiment in Protocol Independent Multicast-Sparse Mode of the present invention with reference to Fig. 2.
The step of structure multicast forwarding list item, includes：
S 1 1 :All two-layer equipments between the multicast source and the convergent point router receive the recipient sent from the convergent point router and add multicast group request message；The wherein described multicast group request message that adds includes the port where address, the address of the multicast group and the recipient of the multicast source；
Wherein, before step S 11, recipient first sends to the convergent point router and adds multicast group request message（For example, I GMP request messages）, request addition multicast group；The convergent point router is received after the addition multicast group request message, the addition multicast group request message is sent to multicast source, by all two-layer equipments between the multicast source and the convergent point router.
S 1 2 :All two-layer equipments between the multicast source and the convergent point router record the port where the address, the address of the multicast group and the recipient of the multicast source, to form the multicast forwarding list item of the recipient；
Wherein, the information of port where including the address, the address of the multicast group and the recipient of the multicast source in the multicast forwarding list item of the recipient, when receiving multicast packet, just multicast packet can be sent to the recipient according to the multicast forwarding list item of the recipient, it is to avoid the flooding forwarding of multicast packet.
Further, the multicast forwarding list item that the basis has been built carries out forwarding to the multicast packet to be included：Port according to corresponding to the multicast forwarding list item built opens the multicast forwarding list item, by the corresponding port, is forwarded to the multicast packet.
Carry out completely to describe the multicast forward method embodiment in Protocol Independent Multicast-Sparse Mode of the present invention below.
During cast communication, multicast source sends multicast packet to the two-layer equipment that multicast source is joined directly together；
It is described to be received with the two-layer equipment that multicast source is joined directly together after the multicast packet, the data message is packaged into Protocol Independent Multicast logon message, and described in the Protocol Independent Multicast logon message notice according to convergent point router address to the convergent point router unicast
Multicast source is present；Wherein the address of convergent point router is configured in the two-layer equipment being joined directly together with multicast source；
The convergent point router receives the Protocol Independent Multicast logon message and knows that the multicast source is present；
Recipient sends to the convergent point router adds multicast group request message, and request adds multicast group；
The convergent point router is received after the addition multicast group request message, to addition multicast group request message described in the multicast source multicast；
Wherein, when the convergent point router is to multicast source multicast addition multicast group request message, the three-layer equipment that adding multicast group request message can first pass through between the convergent point router and the multicast source reaches the edge three-layer equipment being connected with the multicast source, and towards multicast group request message is added described in the multicast source unicast, (PIM power mouthful enters request message or IGMP (Internet Group Management Protocol, Internet Group Management Protocol as the edge three-layer equipment continuation being connected with multicast source）Power mouthful enters request message）, the two-layer equipment being joined directly together with the multicast source is reached by all two-layer equipments between the edge three-layer equipment being connected with multicast source and the multicast source；Or, in the case of there is no three-layer equipment between the convergent point router and the multicast source, towards multicast group request message is added described in the multicast source unicast, the two-layer equipment being joined directly together with the multicast source directly is reached by all two-layer equipments between the convergent point router and the multicast source for the convergent point router；
All two-layer equipments between the multicast source and the convergent point router are received after the addition multicast group request message, form corresponding multicast forwarding list item, and open the port corresponding to the multicast forwarding list item；
The two-layer equipment between the multicast source and the convergent point router is after the multicast packet is received, search the multicast forwarding list item built, if finding the multicast forwarding list item built, the multicast forwarding list item that then basis has been built opens the port corresponding to the multicast forwarding list item, by the corresponding port, the multicast packet is forwarded.If not finding the multicast forwarding list item built, repeated registration process, will the multicast packet be packaged into Protocol Independent Multicast logon message, and according to the convergent point of inside configuration
Router address, to Protocol Independent Multicast logon message described in the convergent point router unicast, to notify multicast source described in the convergent point router to exist.
The embodiment of the present invention is when receiving the multicast packet that multicast source is sent, by searching the multicast forwarding list item for adding multicast group request message according to receipts person and having built, find it is described built multicast forwarding list item when according to the multicast forwarding list item opening corresponding port built, by the corresponding ports come corresponding multicast data forwarding；Simultaneously when not finding the multicast forwarding list item built, to convergent point router unicast protocol independent multicast logon message, without flooding forwarding, simultaneously when receiving recipient's addition multicast group request message, build the multicast forwarding list item of the recipient, and forwarded according to the multicast forwarding list item newly built, the problem of multicast packet is flooded is can solve the problem that, the network bandwidth is saved.
In addition, with reference to Fig. 3, Fig. 3 is the block diagram of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention.The present invention also provides a kind of multicast forwarding equipment 3, and the multicast forwarding equipment 3 can be the two-layer equipment being joined directly together with multicast source, including：
Multicast data reception unit 30, the multicast packet for receiving multicast source transmission；Memory cell 32, for storing the multicast forwarding list item built；
Searching unit 34, the multicast forwarding list item built for being searched from the memory cell；
Retransmission unit 36, for the searching unit find it is described built multicast forwarding list item when, the multicast packet is forwarded according to the multicast forwarding list item built.
During cast communication, multicast source sends multicast packet, and multicast data reception unit 30 receives the multicast packet that multicast source is sent；And the multicast forwarding list item built is searched from the memory cell 32 by searching unit 34, if finding the multicast forwarding list item built, the multicast forwarding list item that then basis has been built opens the port corresponding to the multicast forwarding list item, by retransmission unit 36 is forwarded by the corresponding port to the multicast packet.If not finding the multicast forwarding list item built, the multicast packet is then packaged into Protocol Independent Multicast logon message, and the Protocol Independent Multicast logon message according to the convergent point router address to the convergent point router unicast of inside configuration notifies the multicast source to exist.
Multicast forwarding equipment of the embodiment of the present invention receive multicast source send multicast packet when,
The multicast forwarding list item built is searched from the memory cell 32 by searching unit 34, and corresponding port is opened according to the multicast forwarding list item built, by retransmission unit 36 by the corresponding ports can solve the problem that the problem of multicast packet is flooded come corresponding multicast data forwarding, the network bandwidth is saved.
Further, Fig. 4 is another block diagram of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention.As shown in Fig. 4, the multicast forwarding equipment further comprises forwarding-table item construction unit 38, for when searching unit 34 does not find the multicast forwarding list item built, adding multicast group request message according to recipient and building multicast forwarding list item.
During cast communication, multicast source sends multicast packet, and multicast data reception unit 30 receives the multicast packet that multicast source is sent；And the multicast forwarding list item built is searched from the memory cell 32 by searching unit 34, if finding the multicast forwarding list item built, the multicast forwarding list item that then basis has been built opens the port corresponding to the multicast forwarding list item, by retransmission unit 36 is forwarded by the corresponding port to the multicast packet.If not finding the multicast forwarding list item built, the multicast packet is then packaged into Protocol Independent Multicast logon message, and the Protocol Independent Multicast logon message according to the convergent point router address to the convergent point router unicast of inside configuration notifies the multicast source to exist.
Wherein, the multicast forwarding list item that has built be when receiving recipient and adding multicast group request message, what forwarding-table item construction unit 38 added multicast group request message according to the recipient and accordingly built.
Fig. 5 is the block diagram of the forwarding-table item construction unit of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention.As shown in figure 5, the forwarding-table item construction unit 38 includes：
Receiving module 381, multicast group request message is added for receiving the recipient sent from the convergent point router；The wherein described multicast group request message that adds includes the port where address, the address of the multicast group and the recipient of the multicast source；
Logging modle 38 2, for recording the port where the address, the address of the multicast group and the recipient of the multicast source, to form the multicast forwarding list item of the recipient.
Multicast forwarding equipment of the embodiment of the present invention searches the multicast forwarding list item built by searching unit 34 when receiving the multicast packet that multicast source is sent from the memory cell 32,
And the multicast forwarding list item built according to forwarding-table item construction unit 38 opens corresponding port, by retransmission unit 36 by the corresponding ports come corresponding multicast data forwarding, simultaneously when searching unit 34 does not search the multicast forwarding list item built from the memory cell 32, the multicast forwarding list item of the recipient is built according to recipient's addition multicast group request message, and forwarded according to the multicast forwarding list item newly built, the problem of multicast packet is flooded is can solve the problem that, the network bandwidth is saved.
It is pointed out that the two-layer equipment mentioned in each embodiment of the invention is preferably Layer 2 switch, also can be other two-layer equipments certainly; similarly; three-layer equipment is preferably router, also can be certainly other three-layer equipments, they are all within the scope of the present invention is protected.
One of ordinary skill in the art will appreciate that realizing that all or part of step in above-described embodiment method can be by program to instruct the hardware of correlation to complete, described program can be stored in a kind of computer-readable recording medium, and the storage medium can be read-only storage, disk or CD etc..
It is described above; only embodiment of the invention, but protection scope of the present invention is not limited thereto, any one skilled in the art the invention discloses technical scope in; change or replacement can be readily occurred in, should be all included within the scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (1)
- Claims1st, a kind of multicast forward method in Protocol Independent Multicast-Sparse Mode, it is characterised in that including：The multicast packet that multicast source is sent is received with the two-layer equipment that multicast source is joined directly together；Described to search the multicast forwarding list item built with the two-layer equipment that multicast source is joined directly together, if finding the multicast forwarding list item built, the multicast forwarding list item built according to is forwarded to the multicast packet.2nd, multicast forward method as claimed in claim 1, it is characterised in that also include：If described do not find the multicast forwarding list item built with the two-layer equipment that multicast source is joined directly together, the multicast packet is then packaged into Protocol Independent Multicast logon message, and according to the convergent point router address of configuration inside the two-layer equipment being joined directly together with multicast source, to Protocol Independent Multicast logon message described in the convergent point router unicast, to notify multicast source described in the convergent point router to exist.3rd, multicast forward method as claimed in claim 2, it is characterized in that, after Protocol Independent Multicast logon message described in the two-layer equipment to the convergent point router unicast being joined directly together with multicast source, when there is recipient to send addition multicast group request message to the convergent point router, the step of multicast forward method also includes building multicast forwarding list item.4th, multicast forward method as claimed in claim 3, it is characterised in that include the step of the structure multicast forwarding list item：All two-layer equipments between the multicast source and the convergent point router receive the recipient sent from the convergent point router and add multicast group request message, wherein the multicast group request message that adds includes the port where address, the address of the multicast group and the recipient of the multicast source；All two-layer equipments between the multicast source and the convergent point router record the port where the address, the address of the multicast group and the recipient of the multicast source, to form the multicast forwarding list item of the recipient.5th, multicast forward method as claimed in claim 1, it is characterised in that the multicast forwarding list item that the basis has been built carries out forwarding to the multicast packet to be included：Port according to corresponding to the multicast forwarding list item built opens the multicast forwarding list item, by the corresponding port, is forwarded to the multicast packet.6th, the multicast forward method as described in any one of claim 1-5, it is characterised in that described two-layer equipment is Layer 2 switch. 7th, a kind of multicast forwarding equipment in Protocol Independent Multicast-Sparse Mode, it is characterised in that the multicast forwarding equipment is the two-layer equipment being joined directly together with multicast source, the multicast forwarding equipment includes：Multicast data reception unit, for receiving the multicast packet that the multicast source is sent；Memory cell, for storing the multicast forwarding list item built；Searching unit, the multicast forwarding list item built for being searched from the memory cell；Retransmission unit, for the searching unit find it is described built multicast forwarding list item when, the multicast packet is forwarded according to the multicast forwarding list item built.8th, multicast forwarding equipment according to claim 7, it is characterized in that, further comprise, forwarding-table item construction unit, for the searching unit do not find it is described built multicast forwarding list item when, multicast group request message is added according to recipient and multicast forwarding list item is built.9th, multicast forwarding equipment according to claim 8, it is characterised in thatThe forwarding-table item construction unit includes：Receiving module, multicast group request message is added for receiving the recipient sent from the convergent point router；The wherein described multicast group request message that adds includes the port where address, the address of the multicast group and the recipient of the multicast source；Logging modle, for recording the port where the address, the address of the multicast group and the recipient of the multicast source, to form the multicast forwarding list item of the recipient.10, the multicast forwarding equipment as described in claim 7-9 is any, it is characterised in that described is Layer 2 switch with the two-layer equipment that multicast source is joined directly together.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2011/077324 WO2012167482A1 (en) | 2011-07-19 | 2011-07-19 | Multicast forwarding method and multicast forwarding device in sparse mode-protocol independent multicast |
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| CN102986178A true CN102986178A (en) | 2013-03-20 |
| CN102986178B CN102986178B (en) | 2015-06-03 |
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Cited By (1)
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| CN113489642A (en) * | 2021-07-04 | 2021-10-08 | 芯河半导体科技(无锡)有限公司 | PIM-SM source registration optimization method |
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| CN102075422B (en) * | 2011-01-04 | 2014-06-25 | 杭州华三通信技术有限公司 | Multicast management method and two-layer equipment |
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- 2011-07-19 CN CN201180001206.0A patent/CN102986178B/en not_active Expired - Fee Related
- 2011-07-19 WO PCT/CN2011/077324 patent/WO2012167482A1/en active Application Filing
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| CN101478477A (en) * | 2008-12-01 | 2009-07-08 | 北京星网锐捷网络技术有限公司 | Multicast packet forwarding method and device |
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| CN113489642A (en) * | 2021-07-04 | 2021-10-08 | 芯河半导体科技(无锡)有限公司 | PIM-SM source registration optimization method |
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| CN102986178B (en) | 2015-06-03 |
| WO2012167482A1 (en) | 2012-12-13 |
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