CN102986178B - 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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- CN102986178B CN102986178B CN201180001206.0A CN201180001206A CN102986178B CN 102986178 B CN102986178 B CN 102986178B CN 201180001206 A CN201180001206 A CN 201180001206A CN 102986178 B CN102986178 B CN 102986178B
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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
Provided in the embodiments of the present invention are a multicast forwarding method and multicast forwarding device in sparse mode-protocol independent multicast. The method and device relate to the internet protocol multicast communications and are invented to solve the multicast data flooding problem of lay-two devices. The solution of the invention includes: receiving multicast data sent by a multicast source; searching for an established multicast forwarding table entry and forwarding the multicast data according the established multicast forwarding table entry if the established multicast forwarding table entry is found. The embodiments of the invention are used in multicast communications.
Description
Technical field
The present invention relates to the communications field, particularly relate to the multicast forward method in Protocol Independent Multicast-Sparse Mode and multicast forwarding equipment.
Background technology
PIM-SM (Protocol independent multicast-sparse mode, Protocol IndependentMulticast-Sparse Mode) belongs to the multicast routing protocol of sparse mode.PIM-SM is a kind of agreement realizing IP (Internet Protocol) multicast.
Under PIM-SM agreement, multicast source often needs could arrive IP network equipment through two-layer network device, but in the prior art, two-layer network device generally needs flux of multicast to be given to all nodes could arrive IP network equipment, can cause flux of multicast inundation like this.
Summary of the invention
One aspect of the present invention provides a kind of multicast forward method in Protocol Independent Multicast-Sparse Mode and multicast forwarding equipment, can solve the problem of two-layer equipment multicast packet inundation.
For achieving the above object, one aspect of the present invention adopts following technical scheme:
A multicast forward method in Protocol Independent Multicast-Sparse Mode, comprising:
The multicast packet that the two-layer equipment receiving group source be directly connected with multicast source sends;
Describedly search with the two-layer equipment that multicast source is directly connected the multicast forwarding list item built, if the multicast forwarding list item built described in finding, then according to the described multicast forwarding list item built, described multicast packet is forwarded.
One aspect of the present invention also provides a kind of multicast forwarding equipment, and it comprises,
Multicast data reception unit, for the multicast packet that receiving group source sends;
Memory cell, for storing the multicast forwarding list item built;
Search unit, for searching the multicast forwarding list item built from described memory cell;
Retransmission unit, for described search unit find described in built multicast forwarding list item time, according to the described multicast forwarding list item built, described multicast packet is forwarded.
In multicast forward method in the Protocol Independent Multicast-Sparse Mode that one aspect of the present invention provides and multicast forwarding equipment, during the multicast packet sent in receiving group source, by searching the multicast forwarding list item built, and carry out according to the described multicast forwarding list item built the problem that corresponding multicast data forwarding can solve multicast packet inundation, save the network bandwidth.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing 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 building multicast forwarding list item in the multicast forward method embodiment in Protocol Independent Multicast-Sparse Mode of the present invention;
Fig. 3 is the calcspar of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention;
Fig. 4 is another calcspar of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention;
Fig. 5 is the calcspar of the forwarding-table item construction unit of 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 present invention easy to implement.Describe the present invention below in conjunction with drawings and the specific embodiments.
With reference to figure 1, the embodiment of the present invention provides a kind of multicast forward method in Protocol Independent Multicast-Sparse Mode, comprising:
S1: the multicast packet that the two-layer equipment receiving group source be directly connected with multicast source sends;
Wherein, describedly comprise all working at OSI (open system interconnection with the two-layer equipment that multicast source is directly connected, Open System Interconnect) equipment on the second layer (i.e. data link layer) in seven layer model, such as Layer 2 switch; Similarly, three-layer equipment comprises the equipment in the third layer of all working in OSI seven layer model (i.e. network layer), such as router;
S2: describedly search with the two-layer equipment that multicast source is directly connected the multicast forwarding list item built, if the multicast forwarding list item built described in finding, then forwards described multicast packet according to the described multicast forwarding list item built;
During forwarding, next two-layer equipment is given according to the described multicast forwarding list item built by described transmitting multicast data by the described two-layer equipment be directly connected with multicast source, the multicast forwarding list item that described next two-layer equipment continues according to having built carries out forwarding until arrive convergent point router, is then continued to transmit multicast packet by described convergent point router.
During the multicast packet that the embodiment of the present invention sends in receiving group source, by searching the multicast forwarding list item built, and carrying out according to the described multicast forwarding list item built the problem that corresponding multicast data forwarding can solve multicast packet inundation, saving the network bandwidth.
In one embodiment, described multicast forward method also comprises: describedly search with the two-layer equipment that multicast source is directly connected the multicast forwarding list item built, if the multicast forwarding list item built described in not finding, then described multicast packet is packaged into Protocol Independent Multicast logon message, and according to the convergent point router address of internal configurations, to Protocol Independent Multicast logon message described in the clean culture of described convergent point router, to notify that described multicast source exists.
Wherein, be packaged in Protocol Independent Multicast logon message process at the described two-layer equipment be directly connected with multicast source by described multicast packet, the described two-layer equipment be directly connected with multicast source is directly discarded in every twice and described multicast packet is packaged into multicast packet received between Protocol Independent Multicast logon message.Packaged Protocol Independent Multicast logon message is periodically sent to described convergent point router by the described two-layer equipment be directly connected with multicast source.
The embodiment of the present invention, when not finding the multicast forwarding list item built, to convergent point router unicast protocol independent multicast logon message, is not carried out inundation forwarding, can be solved the problem of multicast packet inundation, saves the network bandwidth.
Further, at the described two-layer equipment be directly connected with multicast source to after Protocol Independent Multicast logon message described in the clean culture of described convergent point router, multicast group request message is added (such as to described convergent point router transmission when there being recipient, IGMP (Internet Group Management Protocol) request message) time, described multicast forward method also comprises the step of the multicast forwarding list item building described recipient.
The step building multicast forwarding list item in Protocol Independent Multicast-Sparse Mode of the present invention in multicast forward method embodiment is described below in conjunction with Fig. 2.
The step of described structure multicast forwarding list item comprises:
S11: all two-layer equipments between described multicast source and described convergent point router receive the recipient sent from described convergent point router and add multicast group request message; The wherein said port adding multicast group request message and comprise the address of described multicast source, the address of described multicast group and described recipient place;
Wherein, before step S11, recipient first sends to described convergent point router and adds multicast group request message (such as, IGMP request message), and request adds multicast group; After adding multicast group request message described in described convergent point router receives, described in sending to multicast source, add multicast group request message, all two-layer equipments between described multicast source and described convergent point router.
S12: the port at the address of multicast source described in all two-layer equipment records between described multicast source and described convergent point router, the address of described multicast group and described recipient place, to form the multicast forwarding list item of described recipient;
Wherein, the information of the address of described multicast source, the address of described multicast group and described recipient place port is included in the multicast forwarding list item of described recipient, when receiving multicast packet, just according to the multicast forwarding list item of described recipient, multicast packet can be sent to described recipient, the inundation avoiding multicast packet forwards.
Further, the multicast forwarding list item that described basis has built carries out forwarding to described multicast packet and comprises: open the port corresponding to described multicast forwarding list item according to the multicast forwarding list item built, by the port of described correspondence, described multicast packet is forwarded.
Carry out the multicast forward method embodiment in complete description Protocol Independent Multicast-Sparse Mode of the present invention below.
In cast communication process, multicast source sends multicast packet to the two-layer equipment that multicast source is directly connected;
Describedly receive after described multicast packet with the two-layer equipment that multicast source is directly connected, described data message is packaged into Protocol Independent Multicast logon message, and notifies that described multicast source exists according to convergent point router address to Protocol Independent Multicast logon message described in the clean culture of described convergent point router; Wherein the address of convergent point router configures in the described two-layer equipment be directly connected with multicast source;
Described convergent point router receives described Protocol Independent Multicast logon message and knows that described multicast source exists;
Recipient sends to described convergent point router and adds multicast group request message, and request adds multicast group;
After adding multicast group request message described in described convergent point router receives, described in described multicast source multicast, add multicast group request message;
Wherein, when described convergent point router adds multicast group request message to described multicast source multicast, add multicast group request message and first can arrive with the three-layer equipment between described multicast source the edge three-layer equipment be connected with described multicast source through described convergent point router, and continued towards adding multicast group request message described in described multicast source clean culture by the described edge three-layer equipment be connected with multicast source that (PIM joins request message or IGMP (Internet Group ManagementProtocol, Internet Group Management Protocol) join request message), all two-layer equipments between the described edge three-layer equipment that is connected with multicast source and described multicast source and arrive the two-layer equipment be directly connected with described multicast source, or, when there is no three-layer equipment between described convergent point router and described multicast source, described convergent point router directly adds multicast group request message described in described multicast source clean culture, arrives the two-layer equipment be directly connected with described multicast source through described convergent point router with all two-layer equipments between described multicast source,
After adding multicast group request message described in all two-layer equipments between described multicast source and described convergent point router receive, form corresponding multicast forwarding list item, and open the port corresponding to described multicast forwarding list item;
Described two-layer equipment between described multicast source and described convergent point router is after receiving described multicast packet, search the multicast forwarding list item built, if the multicast forwarding list item built described in finding, then open the port corresponding to described multicast forwarding list item according to the multicast forwarding list item built, by the port of described correspondence, described multicast packet is forwarded.If the multicast forwarding list item built described in not finding, then repeated registration process, Protocol Independent Multicast logon message is packaged into by described multicast packet, and according to the convergent point router address of internal configurations, to Protocol Independent Multicast logon message described in the clean culture of described convergent point router, to notify that multicast source described in described convergent point router exists.
During the multicast packet that the embodiment of the present invention sends in receiving group source, by searching the multicast forwarding list item adding multicast group request message structure according to receipts person, open corresponding port when the multicast forwarding list item built described in finding according to the described multicast forwarding list item built, carry out corresponding multicast data forwarding by described corresponding ports; Simultaneously when not finding the multicast forwarding list item built, to convergent point router unicast protocol independent multicast logon message, do not carry out inundation forwarding, simultaneously when receiving recipient and adding multicast group request message, build the multicast forwarding list item of described recipient, and forward according to the new multicast forwarding list item built, the problem of multicast packet inundation can be solved, save the network bandwidth.
In addition, with reference to figure 3, Fig. 3 be the calcspar 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 this multicast forwarding equipment 3 can be the two-layer equipment be directly connected with multicast source, comprising:
Multicast data reception unit 30, for the multicast packet that receiving group source sends;
Memory cell 32, for storing the multicast forwarding list item built;
Search unit 34, for searching the multicast forwarding list item built from described memory cell;
Retransmission unit 36, for described search unit find described in built multicast forwarding list item time, according to the described multicast forwarding list item built, described multicast packet is forwarded.
In cast communication process, multicast source sends multicast packet, the multicast packet that multicast data reception unit 30 receiving group source sends; And from described memory cell 32, search by searching unit 34 the multicast forwarding list item built, if the multicast forwarding list item built described in finding, then open the port corresponding to described multicast forwarding list item according to the multicast forwarding list item built, by the port of retransmission unit 36 by described correspondence, described multicast packet is forwarded.If the multicast forwarding list item built described in not finding, then described multicast packet is packaged into Protocol Independent Multicast logon message, and notifies that described multicast source exists according to the convergent point router address of internal configurations to Protocol Independent Multicast logon message described in the clean culture of described convergent point router.
During the multicast packet that embodiment of the present invention multicast forwarding equipment sends in receiving group source, from described memory cell 32, the multicast forwarding list item built is searched by searching unit 34, and open corresponding port according to the described multicast forwarding list item built, carry out by described corresponding ports the problem that corresponding multicast data forwarding can solve multicast packet inundation by retransmission unit 36, save the network bandwidth.
Further, Fig. 4 is another calcspar of the multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention.As shown in Figure 4, described multicast forwarding equipment comprises forwarding-table item construction unit 38 further, for when searching unit 34 and not finding the multicast forwarding list item built, adds multicast group request message and build multicast forwarding list item according to recipient.
In cast communication process, multicast source sends multicast packet, the multicast packet that multicast data reception unit 30 receiving group source sends; And from described memory cell 32, search by searching unit 34 the multicast forwarding list item built, if the multicast forwarding list item built described in finding, then open the port corresponding to described multicast forwarding list item according to the multicast forwarding list item built, by the port of retransmission unit 36 by described correspondence, described multicast packet is forwarded.If the multicast forwarding list item built described in not finding, then described multicast packet is packaged into Protocol Independent Multicast logon message, and notifies that described multicast source exists according to the convergent point router address of internal configurations to Protocol Independent Multicast logon message described in the clean culture of described convergent point router.
Wherein, the described multicast forwarding list item built is when receiving recipient and adding multicast group request message, and forwarding-table item construction unit 38 adds multicast group request message according to described recipient and corresponding structure.
Fig. 5 is the calcspar of the forwarding-table item construction unit of multicast forwarding equipment embodiment in Protocol Independent Multicast-Sparse Mode of the present invention.As shown in Figure 5, described forwarding-table item construction unit 38 comprises:
Receiver module 381, adds multicast group request message for receiving the recipient sent from described convergent point router; The wherein said port adding multicast group request message and comprise the address of described multicast source, the address of described multicast group and described recipient place;
Logging modle 382, for recording the port at the address of described multicast source, the address of described multicast group and described recipient place, to form the multicast forwarding list item of described recipient.
During the multicast packet that embodiment of the present invention multicast forwarding equipment sends in receiving group source, from described memory cell 32, the multicast forwarding list item built is searched by searching unit 34, and open corresponding port according to the multicast forwarding list item that forwarding-table item construction unit 38 has built, corresponding multicast data forwarding is carried out by described corresponding ports by retransmission unit 36, simultaneously when searching unit 34 and do not search the multicast forwarding list item built from described memory cell 32, add multicast group request message according to recipient and build the multicast forwarding list item of described recipient, and forward according to the new multicast forwarding list item built, the problem of multicast packet inundation can be solved, save the network bandwidth.
It is pointed out that two-layer equipment mentioned in each embodiment of the present invention is preferably Layer 2 switch, certainly also can be other two-layer equipments; similarly; three-layer equipment is preferably router, certainly also can be other three-layer equipments, within the scope that they are all protected in the present invention.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, and described storage medium can be read-only memory, disk or CD etc.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (8)
1. the multicast forward method in Protocol Independent Multicast-Sparse Mode, is characterized in that, comprising:
The multicast packet that the two-layer equipment receiving group source be directly connected with multicast source sends;
Describedly search with the two-layer equipment that multicast source is directly connected the multicast forwarding list item built, if the multicast forwarding list item built described in finding, then according to the described multicast forwarding list item built, described multicast packet is forwarded, the described multicast forwarding list item built is that the recipient sent according to convergent point router adds multicast group request message and builds, the wherein said port adding multicast group request message and comprise the address of described multicast source, the address of described multicast group and described recipient place;
The multicast forwarding list item built described in not finding with the two-layer equipment that multicast source is directly connected if described, then described multicast packet is packaged into Protocol Independent Multicast logon message, and according to the convergent point router address of the described two-layer equipment internal configurations be directly connected with multicast source, to Protocol Independent Multicast logon message described in the clean culture of described convergent point router, to notify that multicast source described in described convergent point router exists.
2. multicast forward method as claimed in claim 1, it is characterized in that, at the described two-layer equipment be directly connected with multicast source to after Protocol Independent Multicast logon message described in the clean culture of described convergent point router, when there being recipient to add multicast group request message to described convergent point router transmission, described multicast forward method also comprises the step building multicast forwarding list item.
3. multicast forward method as claimed in claim 2, it is characterized in that, the step of described structure multicast forwarding list item comprises:
All two-layer equipments between described multicast source and described convergent point router receive the recipient sent from described convergent point router and add multicast group request message;
The port at the address of multicast source described in all two-layer equipment records between described multicast source and described convergent point router, the address of described multicast group and described recipient place, to form the multicast forwarding list item of described recipient.
4. multicast forward method as claimed in claim 1, it is characterized in that, the multicast forwarding list item that described basis has built carries out forwarding to described multicast packet and comprises:
Open the port corresponding to described multicast forwarding list item according to the multicast forwarding list item built, by the port of described correspondence, described multicast packet is forwarded.
5. the multicast forward method as described in any one of claim 1-4, is characterized in that,
Described two-layer equipment is Layer 2 switch.
6. the multicast forwarding equipment in Protocol Independent Multicast-Sparse Mode, is characterized in that, described multicast forwarding equipment is the two-layer equipment be directly connected with multicast source, and described multicast forwarding equipment comprises:
Multicast data reception unit, for receiving the multicast packet that described multicast source sends;
Memory cell, for storing the multicast forwarding list item of structure;
Search unit, for searching the multicast forwarding list item built from described memory cell;
Retransmission unit, for described search unit find described in built multicast forwarding list item time, according to the described multicast forwarding list item built, described multicast packet is forwarded, the described multicast forwarding list item built is that the recipient sent according to convergent point router adds multicast group request message and builds, the wherein said port adding multicast group request message and comprise the address of described multicast source, the address of described multicast group and described recipient place;
Forwarding-table item construction unit, for described search unit do not find described in built multicast forwarding list item time, add multicast group request message according to recipient and build multicast forwarding list item.
7. multicast forwarding equipment according to claim 6, is characterized in that,
Described forwarding-table item construction unit comprises:
Receiver module, adds multicast group request message for receiving the recipient sent from described convergent point router;
Logging modle, for recording the port at the address of described multicast source, the address of described multicast group and described recipient place, to form the multicast forwarding list item of described recipient.
8. the multicast forwarding equipment as described in as arbitrary in claim 6-7, is characterized in that,
Described is Layer 2 switch with the two-layer equipment that multicast source is directly connected.
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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 CN102986178A (en) | 2013-03-20 |
| CN102986178B true CN102986178B (en) | 2015-06-03 |
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| CN113489642B (en) * | 2021-07-04 | 2023-05-12 | 芯河半导体科技(无锡)有限公司 | PIM-SM source registration optimization method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN101605103A (en) * | 2009-07-16 | 2009-12-16 | 杭州华三通信技术有限公司 | A kind of method of static forwarding multicast data and device |
| CN101895475A (en) * | 2010-07-30 | 2010-11-24 | 迈普通信技术股份有限公司 | Graceful restart method based on PIM SM protocol and system thereof |
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| EP1269768A1 (en) * | 2000-03-31 | 2003-01-02 | BRITISH TELECOMMUNICATIONS public limited company | Method of determining network paths |
| US7389359B2 (en) * | 2001-10-19 | 2008-06-17 | Foundry Networks, Inc. | Method and system for intelligently forwarding multicast packets |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101605103A (en) * | 2009-07-16 | 2009-12-16 | 杭州华三通信技术有限公司 | A kind of method of static forwarding multicast data and device |
| CN101895475A (en) * | 2010-07-30 | 2010-11-24 | 迈普通信技术股份有限公司 | Graceful restart method based on PIM SM protocol and system thereof |
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| CN102986178A (en) | 2013-03-20 |
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