CN101686140A - Method, system and device for multicasting digital subscriber lines - Google Patents
Method, system and device for multicasting digital subscriber lines Download PDFInfo
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- CN101686140A CN101686140A CN200810222854A CN200810222854A CN101686140A CN 101686140 A CN101686140 A CN 101686140A CN 200810222854 A CN200810222854 A CN 200810222854A CN 200810222854 A CN200810222854 A CN 200810222854A CN 101686140 A CN101686140 A CN 101686140A
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Abstract
The invention discloses a method, a system and a device for multicasting digital subscriber lines, belonging to the technical field of communication. The method comprises the following steps: identifying binding digital subscriber lines; establishing a multicasting and distributing relationship between the binding digital subscriber lines and multicasting data; distributing the multicasting data according to the multicasting and distributing relationship. The system comprises network side binding equipment and an access node. The device comprises an identification module, an establishment module and a distribution module. By identifying the binding of the digital subscriber lines, forming the multicasting and distributing relationship for the binding digital subscriber lines, and distributing the multicasting data according to the multicasting and distributing relationship, the invention realizes the multicasting of binding subscribers, and fully utilizing network bandwidth.
Description
Technical field
The present invention relates to communication technique field, particularly a kind of method of multicasting of digital subscriber line, system and device.
Background technology
Traditional DSL (Digital Subscriber Line, digital subscriber line) technology is finished transfer of data by a pair of twisted-pair feeder, even a user has more than a pair of twisted-pair feeder, also can only independently use, the independent transmission data, and can not merge the same data of high-speed transfer.Therefore, in order to increase user's access bandwidth, the many twisted-pair feeder bindings based on single user have appearred.
Traditional multicasting technology will make multicast message arrive each recipient, just needs the recipient to add the IP multicast network, and joins in the corresponding multicast group.IGMP (Internet Group Management Protocol, the IGMP) main frame that to be the IP multicast use at user's network segment is to the signaling mechanism of router.By at recipient's main frame and the multicast router configuration IGMP direct-connected, can realize that main frame dynamically adds, and multicast router is to local network group membership management of information with it.
In the prior art, DSL adopts MP (Multilink Point-to-Point Protocol, Multi-Link Point-to-Point Protocol) binding mode, this binding mode is carried by PPP (Point-to-Point Protocol, point-to-point protocol) mode the multicast data message of IGMP.Multicast replication point is at the local side of PPP.
In realizing process of the present invention, the inventor finds that prior art comprises following problem at least:
Under the situation of DSL binding, adopt the binding mode of MP to transmit multicast packet at Access Network with mode of unicast, caused the waste of Access Network bandwidth.
Summary of the invention
In order to realize the multicast of bundled user, and make full use of the network bandwidth, the embodiment of the invention provides a kind of multicast distribution method of digital subscriber line binding.
Described technical scheme is as follows:
A kind of method of multicasting of digital subscriber line, described method comprises:
The identification binding digital subscriber lines;
Set up the multicast distribution relation between described binding digital subscriber lines and the multicast packet;
According to the described multicast packet of described multicast distribution relation distribution.
A kind of multi-cast system of digital subscriber line, described system comprises:
Network side binding equipment is used to discern binding digital subscriber lines, and sets up the multicast distribution relation between described binding digital subscriber lines and the multicast packet;
Access node is used for according to the described multicast packet of described multicast distribution relation distribution.
A kind of multicast apparatus of digital subscriber line, described device comprises:
Identification module is used to discern binding digital subscriber lines;
Set up module, be used to set up the multicast distribution relation between described binding digital subscriber lines and the multicast packet;
Distribution module is used for according to the described multicast packet of described multicast distribution relation distribution.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
By the DSL of identification binding, and for the DSL of binding forms the multicast distribution relation, and concern the distribution group multicast data according to multicast distribution, realize the multicast of bundled user, and made full use of the network bandwidth.
Description of drawings
Fig. 1 is the method for multicasting flow chart of a kind of DSL of providing in the embodiment of the invention 1;
Fig. 2 is the path schematic diagram of the data passes that provides in the embodiment of the invention 1;
Fig. 3 is that the network side bonding module that provides in the embodiment of the invention 1 spans into node binding multicast procedures schematic diagram when being positioned at the IP edge;
Fig. 4 is that the network side bonding module that provides in the embodiment of the invention 1 spans into node binding multicast procedures schematic diagram when being positioned at aggregation node;
Fig. 5 is the multicast procedures schematic diagram of the straddle binding that provides in the embodiment of the invention 1;
Fig. 6 is the multicast procedures schematic diagram that spans into the node binding that provides in the embodiment of the invention 1;
Fig. 7 is the multi-cast system schematic diagram of the DSL that provides in the embodiment of the invention 2;
Fig. 8 is the multicast apparatus structural representation of a kind of DSL of providing in the embodiment of the invention 2;
Fig. 9 is the structural representation of the identification module that provides in the embodiment of the invention 2;
Figure 10 is the structural representation of a kind of distribution module of providing in the embodiment of the invention 2;
Figure 11 is the structural representation of the another kind of distribution module that provides in the embodiment of the invention 2.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
The embodiment of the invention is satisfying under the situation of line bundle, by the DSL of identification binding, and for the DSL of binding forms the multicast distribution relation, and concern the distribution group multicast data according to multicast distribution, realize the multicast of bundled user, and made full use of the network bandwidth.
Embodiment 1
Referring to Fig. 1, the embodiment of the invention provides a kind of method of multicasting of digital subscriber line, comprising:
101: the identification binding digital subscriber lines;
102: set up the multicast distribution relation between binding digital subscriber lines and the multicast packet;
103: concern the distribution group multicast data according to multicast distribution.
Below this method is done in further detail and is described:
Referring to Fig. 2, in the present embodiment, the IGMP message that main frame sends is from ustomer premises access equipment RG (Remote Gateway, remote gateway) or CPE (Customer Premise Equipment, customer premises equipment, CPE) different ascending physical signal ports arrive network side binding equipment, be the equipment at network side bonding module MUX (multiplexer, multiplexer)/DeMUX (demultiplexer, demultiplexer) place.The network side bonding module can be positioned on the IP edge device or aggregation node (Aggressive Node) on.Between the DSL that the different ascending physical signal ports of RG/CPE connect is bundle relation.
Referring to Fig. 3, being positioned on the IP edge device with the network side bonding module is example, and the CPE/RG uplink is by different AN (Access Node, access node), and the different physical ports at aggregation node and IP edge arrive the IP edge device.AN1 is traditional DSLAM (Digital Subscriber Line Access Multiplexer, digital subscriber line access multiplex) equipment, the more corresponding frequent customers of descending DSL.Because the customer service upgrading need increase bandwidth under the situation that keeps original transmitting range.Because be subjected to the restriction of DSL technology and equipment until old, operator newly is provided with an AN2 again, perhaps can also satisfy the needs of customer service bandwidth at the other new machine frame of increase of used equipment (shown in the frame of broken lines among the figure).
Ustomer premises access equipment CPE/RG is linked into respectively on AN1 and the AN2 by two ascending physical signal port port6 and port1, and that wherein port6 connects is original DSL, and that port1 connects is the new DSL that adds binding.The binding of the equal nonrecognition DSL of AN1 and AN2.The method of multicasting of digital subscriber line specifically comprises:
301: main frame sends IGMP and asks CPE/RG;
Wherein, the MAC Address of main frame is 00-E0-B0-F4-18-11;
Comprise the information that main frame wishes to receive certain particular multicast group A in the IGMP request, the IP address of multicast group A is 224.1.5.6, and VLAN (Virtual Local Area Network, the VLAN) network segment is 100;
After 302:CPE/RG receives the IGMP request of main frame transmission, CPE/RG identifies the IGMP message according to IGMP snooping (igmp snooping) function or IGMP Proxy (igmp proxy) function, and according to the number (2) of the ascending physical signal port that is connected with DSL, the IGMP message is duplicated 2 parts, and 2 ascending physical signal port port7 and port5 that are connected with DSL from CPE/RG send to AN1 and AN2 respectively;
When 303:AN1 and AN2 received CPE/RG from IGMP message that port7 and port5 send respectively, AN1 and AN2 were respectively according to IGMP snooping or IGMP Proxy function, and the multicast group that forms separately receives tabulation, and the IGMP message is carried out up forwarding.
Receive tabulation for forming multicast group, specifically comprise:
AN searches multicast group and receives tabulation according to the multicast ip address of IGMP and the downstream port of reception IGMP message:
If there is no multicast group receives tabulation, then sets up this tabulation, and forms the list item that a multicast group receives tabulation;
If exist multicast group to receive tabulation, but do not exist and multicast ip address and all identical list item of downstream port, then add this list item;
If there is this list item, then upgrade this list item.
Particularly, be example with AN1, AN1 searches multicast group and receives tabulation according to the downstream port (port6) that IP address (224.1.5.6), VLAN (100) and the AN1 of multicast group A in the IGMP message receives the IGMP message:
Multicast group receive do not comprise in the tabulation that the address is that 224.1.5.6, VLAN are 100, downstream port is 6 list item, then above-mentioned data is added multicast group and receives list item in the tabulation, and is as shown in table 1:
Table 1
| The address | ??VLAN | Upstream port | Downstream port |
| ??224.1.5.6 | ??100 | ??7 | ??2 |
| ??224.1.5.6 | ??100 | ??7 | ??4 |
| ??224.1.5.6 | ??100 | ??7 | ??6 |
Correspondingly, it is as shown in table 2 that the multicast group of AN2 receives tabulation:
Table 2
| The address | ??VLAN | Upstream port | Downstream port |
| ??224.1.5.6 | ??100 | ??5 | ??1 |
| ??224.1.5.6 | ??100 | ??5 | ??2 |
| ??224.1.5.6 | ??100 | ??5 | ??5 |
304: network side binding equipment is by the IGMP message of IGMP snooping function reception from the different ascending physical signal ports of CPE/RG.Be kept at the binding configuration information on the network side binding equipment when IGMP message that network side binding equipment basis gets access to and DSL binding, whether judge the DSL whether the IGMP message connects from the different ascending physical signal port of CPE/RG, be the relation of professional expansion between these DSL;
The binding configuration information comprises: binding group id, physical port, logical identifier etc., referring to table 3:
Table 3
| The binding group id | Physical port | Logical identifier |
| ??00-E0-B0-F4-18-11 | ??AN1：port6 | ??VMAC1 |
| ??00-E0-B0-F4-18-11 | ??AN2：port1 | ??VMAC2 |
Wherein, the binding group id is the source MAC of the message that sends of user;
Physical port is the physical port of DSL on AN that the user bundlees;
Logical identifier be the user message from the corresponding physical port of AN through the out-of-date MAC information that need change source MAC into corresponding logical identifier;
Certainly bundle group id, logical identifier, user ID also can adopt the VLAN sign or adopt VLAN and the MAC sign.
Therefore, when network side binding equipment receives the IGMP message that carries the Different Logic sign, only need to judge whether corresponding same binding group id just can judge whether belonged to same user's message to these IGMP messages, if belong to same user's message, then between these DSL the relation of professional expansion.
According to table 3, network side binding equipment is judged, and the IGMP message that the different physical ports of network side binding equipment receive is the relation (also being referred to as bundle relation) of professional expansion between these DSL from the DSL that the different ascending physical signal port of CPE/RG connects.
305:, form the multicast distribution table of bundled user, referring to table 4 for the DSL that is in professional expansion relation;
Table 4
| The address | ??VLAN | Upstream port | Downstream port |
| ??224.1.5.6 | ??100 | ??x | ??3 |
| ??224.1.5.6 | ??100 | ??x | ??2 |
Wherein, upstream port is arbitrary upstream port, therefore represents with x;
Downstream port is each physical port that receives the IGMP message.
301 to 305 is the up process of data, since the 306 descending processes for data.
306: network side binding equipment receives descending multicast data flow, according to the rule of setting (as downlink bandwidth ratio according to each DSL circuit, distribute multicast data flow), the downstream port number (2) according to the multicast distribution table of bundled user is divided into 2 branch's multicast data flows with descending multicast data flow.These 2 branch's multicast data flows can merge forms a complete multicast data flow.Each branch's multicast flow point does not flow to downstream physical port Port3 and Port2;
The descending branch multicast data flow that 307:AN1 and AN2 side will receive sends on separately the downlink physical port (port6 and port1), sends to CPE/RG;
308:CPE/RG receives the branch's multicast data flow from AN1 and AN2 downlink physical port (port6 and port1) transmission, with the synthetic complete multicast traffic stream of 2 branch's multicast data flows, is sent to main frame.
The process that network side bonding module shown in Figure 4 is positioned on the aggregation node is identical with process on being positioned at the IP edge device, so repeat no more.
The DSL of each bar binding of CPE/RG can also be linked into the network of operator by different wiring boards, and wiring board can be the different business plate of same AN, also can be the business board of different AN.
Referring to Fig. 5, be that the different business plate of same AN is an example with wiring board, AN1 is traditional DSLAN equipment.AN1 can discern user's binding.Because the needs of customer service expansion may increase new business board on original AN1, the IGMP message on two DSL is up from the same ascending physical signal port of AN1.For example the user is linked into AN1 by the port6 of the last business board of Slot1 at first, and the port 1 that the later stage has increased business board on the Slot 5 again is linked into AN1.The network side bonding module can be positioned on AN1, aggregation node or the IP edge.Can discern the multicast of realizing bundled user under the situation of user binding at AN1, method comprises:
501: main frame sends IGMP and asks CPE/RG;
Wherein, the IGMP request comprises the IP address (224.1.5.6) and the VLAN network segment (100) of multicast group A;
After 502:CPE/RG receives the IGMP request of main frame transmission, CPE/RG identifies the IGMP message according to IGMP snooping (igmp snooping) function or IGMP Proxy (igmp proxy) function, and the IGMP message duplicated 2 parts, 2 ascending physical signal ports that are connected with DSL from CPE/RG send to AN1 respectively;
The slot 1 of 503:AN1 and the business plate port of slot 2 receive the IGMP message that CPE/RG sends respectively, and pass through the list item in the IGMP snooping function renewal multicast group reception tabulation, and be as shown in table 5, and the IGMP message is sent to the IP edge;
Table 5
| The address | ??VLAN | Upstream port | Downstream port |
| ??A | ??100 | ??5 | ??1 |
| ??A | ??100 | ??5 | ??2 |
| ??A | ??100 | ??5 | ??6 |
504: network side binding equipment receives tabulation or/and multicast group, is preserved at the IP edge according to the IGMP message that receives.Network side binding equipment flows to downstream port or/and the IP edge receives the tabulation duplicated multicast with descending multicast data flow according to multicast group.
After 505:AN1 receives complete descending multicast data flow, duplicate to Port6 and Port1 respectively according to the multicast group reception tabulation of AN1;
Because Port6 and Port1 are the physical ports of binding, so all dispose the mapping template, multicast packet is through the filtration of mapping template, has only the message of coupling just can send to the physical port of CPE/RG, and unmatched message directly abandons;
Wherein, the configuration of mapping template specifically comprises:
The IP edge is according to the state of 2 DSL of user's binding, (for example set the mapping rule, the message of the odd number series of multicast packet is sent to the user port of slot1, even number series message is sent to the user port of slot2), and will shine upon template according to the mapping rule and pass through L2C (Layer 2 Control, 2 layers of control protocol) and be set on the business plate port that DSL inserted of every binding.
506:CPE/RG receives the descending multicast packet from different physical ports, and synthetic complete multicast traffic stream is sent to main frame.
When wiring board was the business board of different AN, as shown in Figure 6, AN1 was traditional DSLAN equipment.Because the needs of customer service expansion, operator newly is provided with an AN2 in that AN1 is other, so DSL strides AN and bundlees.And AN1 and AN2 all can discern user's binding.The process of this process and S501-S506 is identical, no longer describes in detail.
Selected typical application scenarios in the embodiment of the invention, no matter whether AN discerns the binding of DSL, and the method that provides in the embodiment of the invention all can be applied in the above-mentioned typical application scenarios.
The DSL that present embodiment bundlees by identification, and, concern the distribution group multicast data according to multicast distribution for the DSL of binding forms the multicast distribution relation, finished the multicast distribution of bundled user, the method processing is simple, the multiple binding scene of flexible adaptation.This method has not only solved the problem that the high bandwidth business transmits on the low rate tie-in line, and overcome the MP technology owing to adopt mode of unicast to transmit multicast packet at Access Network, the needs that the user bundlees have also been satisfied in the waste of the Access Network bandwidth that causes simultaneously, have realized the multicast of bundled user.
Referring to Fig. 7, the embodiment of the invention provides a kind of multi-cast system of digital subscriber line, specifically comprises:
Network side binding equipment 701 is used to discern binding digital subscriber lines, and sets up the multicast distribution relation between binding digital subscriber lines and the multicast packet;
System also comprises:
Referring to Fig. 8, the embodiment of the invention provides a kind of multicast apparatus of digital subscriber line, comprising:
Set up module 802, be used to set up the multicast distribution relation between binding digital subscriber lines and the multicast packet;
Wherein, referring to Fig. 9, identification module 801 comprises:
Receiving element 801A is used to receive the IGMP message, carries the logical identifier of binding digital subscriber lines in this IGMP message;
Judging unit 801C, it is corresponding with the logical identifier in the binding configuration information to be used for logical identifier that the IGMP message is carried, and judges whether corresponding same binding group id of the logical identifier that carries in the IGMP message;
If then the digital subscriber line of identification transmission IGMP message is a binding digital subscriber lines.
Referring to Figure 10, distribution module 803 comprises:
Division unit 803A is used for multicast packet is divided into a plurality of multicast traffic streams, and the number of a plurality of multicast traffic streams is identical with the number of binding digital subscriber lines;
Dispatching Unit 803B is used for a plurality of multicast traffic streams are distributed to binding digital subscriber lines according to the multicast distribution relation.
Perhaps, referring to Figure 11, distribution module 803 comprises:
Unit 803A ' is set, is used to described binding digital subscriber lines that mapping relations are set;
The DSL that present embodiment bundlees by identification, and, concern the distribution group multicast data according to multicast distribution for the DSL of binding forms the multicast distribution relation, finished the multicast distribution of bundled user, finished the multicast distribution of IGMP, method is handled simple, the multiple binding scene of flexible adaptation.This method has not only solved the problem that the high bandwidth business transmits on the low rate tie-in line, and overcome the MP technology owing to adopt mode of unicast to transmit multicast packet at Access Network, the needs that the user bundlees have also been satisfied in the waste of the Access Network bandwidth that causes simultaneously, have realized the multicast of bundled user.
The embodiment of the invention can utilize software to realize that corresponding software programs can be stored in the storage medium that can read, for example, and in the hard disk of router, buffer memory or the CD.
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 done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of method of multicasting of digital subscriber line is characterized in that, described method comprises:
The identification binding digital subscriber lines;
Set up the multicast distribution relation between described binding digital subscriber lines and the multicast packet;
According to the described multicast packet of described multicast distribution relation distribution.
2, the method for multicasting of digital subscriber line as claimed in claim 1 is characterized in that, described identification binding digital subscriber lines specifically comprises:
Receive the IGMP message, carry the logical identifier of described binding digital subscriber lines in the described IGMP message;
Inquiry binding configuration information, described binding configuration information comprise logical identifier and binding group id;
The logical identifier that carries in the described IGMP message is corresponding with the logical identifier in the described binding configuration information, and judge whether corresponding same binding group id of the logical identifier that carries in the described IGMP message;
If the digital subscriber line of then discerning the described IGMP message of described transmission is a binding digital subscriber lines.
3, the method for multicasting of digital subscriber line as claimed in claim 1 is characterized in that, the described multicast distribution relation of setting up between described binding digital subscriber lines and the multicast packet specifically comprises:
According to IGMP snooping function or IGMP proxy function, set up the multicast distribution table between described binding digital subscriber lines and the multicast packet, comprise the distribution path of described multicast packet in the described multicast distribution table.
4, the method for multicasting of digital subscriber line as claimed in claim 1 is characterized in that, and is described according to the described multicast packet of described multicast distribution relation distribution, specifically comprises:
Described multicast packet is divided into a plurality of multicast traffic streams, and the number of described a plurality of multicast traffic streams is identical with the number of described binding digital subscriber lines;
Described a plurality of multicast traffic streams are distributed to described binding digital subscriber lines according to described multicast distribution relation.
5, the method for multicasting of digital subscriber line according to claim 1 is characterized in that, the described multicast distribution relation of setting up between described binding digital subscriber lines and the multicast packet concerns the distribution group multicast data according to described multicast distribution, specifically comprises:
For described binding digital subscriber lines is provided with mapping relations;
According to described mapping relations, described multicast packet is mated, the message of coupling forms branch's multicast data flow, and unmatched message directly abandons.
6, a kind of multi-cast system of digital subscriber line is characterized in that, described system comprises:
Network side binding equipment is used to discern binding digital subscriber lines, and sets up the multicast distribution relation between described binding digital subscriber lines and the multicast packet;
Access node is used for according to the described multicast packet of described multicast distribution relation distribution.
7, multi-cast system as claimed in claim 6 is characterized in that, described system also comprises:
The IP edge device is used to receive described multicast packet.
8, a kind of multicast apparatus of digital subscriber line is characterized in that, described device comprises:
Identification module is used to discern binding digital subscriber lines;
Set up module, be used to set up the multicast distribution relation between described binding digital subscriber lines and the multicast packet;
Distribution module is used for according to the described multicast packet of described multicast distribution relation distribution.
9, the multicast apparatus of digital subscriber line as claimed in claim 8 is characterized in that, described identification module comprises:
Receiving element is used to receive the IGMP message, carries the logical identifier of described binding digital subscriber lines in the described IGMP message;
Query unit is used for inquiry binding configuration information, and described binding configuration information comprises logical identifier and binding group id;
Judging unit, it is corresponding with the logical identifier in the described binding configuration information to be used for logical identifier that described IGMP message is carried, and judges whether corresponding same binding group id of the logical identifier that carries in the described IGMP message;
If the digital subscriber line of then discerning the described IGMP message of described transmission is a binding digital subscriber lines.
10, the multicast apparatus of digital subscriber line as claimed in claim 8 is characterized in that, described distribution module comprises:
Division unit is used for described multicast packet is divided into a plurality of multicast traffic streams, and the number of described a plurality of multicast traffic streams is identical with the number of described binding digital subscriber lines;
Dispatching Unit is used for described a plurality of multicast traffic streams are distributed to described binding digital subscriber lines according to described multicast distribution relation.
11, the multicast apparatus of digital subscriber line as claimed in claim 8 is characterized in that, described distribution module comprises:
The unit is set, is used to described binding digital subscriber lines that mapping relations are set;
Matching unit is used for according to described mapping relations described multicast packet being mated, and the message of coupling forms branch's multicast data flow, and unmatched message directly abandons.
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| US20060215689A1 (en) * | 2005-03-24 | 2006-09-28 | Alcatel | System-level communication link bonding apparatus and methods |
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