CN102355358A - Method and device for realizing multicast - Google Patents
Method and device for realizing multicast Download PDFInfo
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- CN102355358A CN102355358A CN201110225913XA CN201110225913A CN102355358A CN 102355358 A CN102355358 A CN 102355358A CN 201110225913X A CN201110225913X A CN 201110225913XA CN 201110225913 A CN201110225913 A CN 201110225913A CN 102355358 A CN102355358 A CN 102355358A
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Abstract
The invention discloses a method for realizing multicast. The method comprises the following steps of: while receiving an IGMP (Internet Group Management Protocol) Report message, storing the user VLAN (Virtual Local Area Network) and a multicast IP (Internet Protocol) address carried by the IGMP Report message, and a message receiving port and a multicast VLAN bound with the multicast IP address, in a manner of binding; and only transmitting an IGMP Query message to the corresponding VLAN on the established port when receiving an IGMP Leave message. Based on the same conception, the invention further provides a device which improves the utilization rate of the user side bandwidth and reduces network side bandwidth pressure with simple configuration.
Description
Technical field
The present invention relates to technical field of communication, the method and apparatus that particularly a kind of multicast is realized.
Background technology
Can realize between multicast source and user that through multicast point-to-multipoint network connects efficiently: multicast source transmits identical multicast packet to a plurality of users that belong to same multicast group simultaneously.But such data are at backbone network with through only transmission is a before the Access Network copy-point.After getting into Access Network, multicast packet duplicates at copy-point, becomes many parts of identical data, sends to different recipients.
It is mutual that the realization of multicast depends on multicast protocol message (IGMP message).The user tells switch to hope to add and receive the information in certain specific multicast source through sending multicast protocol report message (IGMP Report message), and switch is initiatively learnt such request, and preserves the corresponding relation of user and multicast group; Equally, the user informs that through sending multicast protocol leave message (IGMP Leave message) switch will withdraw from particular multicast group.In order not influence the reception of other user to multicast packet, switch need send multicast protocol query message (IGMP Query message) to this multicast group after receiving the multicast leave message, to confirm whether also have other user in this multicast group.If no, switch will no longer be safeguarded corresponding user/multicast group corresponding relation, and notice router this multicast packet of not redispatching.
Existing multicast leaves the realization of function all based on port, when switch when certain port receives IGMP Leave message, directly the corresponding relation of this port and multicast group is deleted from the multicast forwarding list item.When having only a user under the port, such processing policy naturally can conserve bandwidth.But, if disposed a plurality of VLAN under this port, and several multicast users being arranged all under each VLAN, switch just need be confirmed inquiry to whether still having other multicast user under this port, this will cause the user side bandwidth waste inevitably.
Referring to Fig. 1, Fig. 1 is for realizing that based on port multicast leaves schematic configuration diagram.Among Fig. 1, switch 103 has disposed a plurality of VLAN at the port one (Port 1) of user side respectively under Port n, and some (greater than 1) multicast user is arranged under each VLAN.Switch 103 links to each other with server 103 through router one 02.Suppose that User 1 has sent IGMP Leave message to switch, at this moment, switch is only known at its port and has been received this message for 1 mouthful, but message is specifically distinguished to be come out from the user among which VLAN.In this case, switch need all send a IGMP Query message to all users that 1 mouthful of all VLAN of port comprise, to confirm whether also have the service of other multicast user in the entrained multicast group of reception IGMP Leave message under this port.If disposed n VLAN for 1 time at port, and have m user under each VLAN, it is individual that the number of the switch IGMPQuery message that need send is (m X n) so.Maximum VLAN can get 4094 usually; User's number can not be confirmed under the same VLAN; Therefore; (m X n) possibly be a very big value; And the user possibly frequently add and leaves certain multicast group; So a large amount of IGMP Query messages has greatly been wasted the copy-point valuable bandwidth of user side later on, run counter to the original intention of multicast protocol design.
By on can know that the realization that existing multicast leaves function has caused the user side waste of bandwidth.
Summary of the invention
In view of this, the method and apparatus that the present invention provides a kind of multicast to realize under the simple situation of configuration, has improved the user side bandwidth utilization.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that
The method that a kind of multicast is realized; This method comprises: when receiving the multicast protocol report IGMP Report message that user side sends; With the message sink mouth of said IGMP Report message, user's virtual LAN VLAN of carrying and multicast group IP address, and bind preservation with the M-VLAN of this multicast group IP address binding;
When receiving the IGMP Leave message that user side sends; If in the information that said binding is preserved, find the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And with the M-VLAN of this multicast group IP address binding, then generate all users in IGMP Query message and the user vlan scope on the message sink mouth of said IGMP Leave message send ask to leave the multicast protocol inquiry IGMP Query message of multicast group IP address.
Wherein, with the message sink mouth of said IGMP Report message, the VLAN that carries and multicast group IP address, and advance to bind after row preserves with the M-VLAN of this multicast group IP address binding, said method further comprises:
Obtain the multicast traffic stream that user side needs from network side, and, said multicast traffic stream is duplicated and send to the user side relative users according to binding message sink mouth and the user vlan of preserving.
Said method further comprises:
If in preset query timeout time and query timeout number of times, receive user's response of the IGMP Query message that sends; Then continue to send in the user vlan scope on the message sink mouth that this binding is preserved this multicast data flow; Otherwise, delete message sink mouth, user vlan, multicast group IP address and M-VLAN that said binding is preserved.
Described method further comprises: set up the multicast forwarding list item in advance, said message sink mouth, user vlan, multicast group IP address and M-VLAN binding are kept in the said multicast forwarding list item.
Said message sink mouth, the user vlan that carries and the multicast group IP address that finds the said IGMP Leave message of bind preserving, and with the method for the M-VLAN of this multicast group IP address binding be:
According to the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And with the M-VLAN of this multicast group IP address binding, in said multicast forwarding list item, find and bind corresponding message sink mouth, user vlan, multicast group IP address and the M-VLAN of preserving.
The equipment that a kind of multicast is realized, said equipment comprises: first receiving element, memory cell, second receiving element, processing unit and transmitting element;
Said first receiving element links to each other with said memory cell, is used to receive the multicast protocol report IGMP Report message that user side is sent;
Said memory cell; Link to each other with said processing unit; Be used for said first receiving element is received the message sink mouth of IGMP Report message, user's virtual LAN VLAN of carrying and multicast group IP address, and bind preservation with the M-VLAN of this address binding;
Said second receiving element links to each other with said processing unit, is used to receive the multicast protocol that user side sends and leaves IGMP Leave message;
Said processing unit; Link to each other with said transmitting element; Be used for said IGMP Leave message according to said second receiving element reception; In the information that said memory cell binding is preserved, find the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And during with the M-VLAN of this multicast group IP address binding, generate multicast protocol inquiry IGMP Query message;
Said transmitting element, all users send the multicast protocol that institute asks to leave multicast group IP address and inquire about IGMP Query message in the user vlan scope of IGMP Query message on the message sink mouth of said IGMPLeave message that said processing unit is generated.
Wherein, said first receiving element links to each other with said processing unit, is further used for obtaining the multicast traffic stream that user side needs from network side;
Said processing unit is further used for, and the multicast traffic stream with said first receiving element obtains duplicates according to binding message sink mouth and the user vlan preserved;
Said transmitting element is further used for the multicast traffic stream that said processing unit duplicates is sent to the user side relative users.
Said processing unit; If be further used for said second receiving element is not received said IGMP Query message in preset query timeout time and query timeout number of times user's response, delete said memory cell and bind message sink mouth, user vlan, multicast group IP address and the M-VLAN of preserving;
Said transmitting element; If be used for said second receiving element is received the IGMP Query message that sends in preset query timeout time and query timeout number of times user's response, then continue to send in the user vlan scope on this message sink mouth this multicast data flow.
Said memory cell is further used for setting up the multicast forwarding list item, message sink mouth, user vlan, multicast group IP address and M-VLAN is bound be kept in this multicast forwarding list item.
Said processing unit; Be used for according to the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And with the M-VLAN of this multicast group IP address binding, find in the multicast forwarding list item in said memory cell and bind corresponding message sink mouth, user vlan, multicast group IP address and the M-VLAN of preserving.
In sum, the present invention when receiving IGMP Report message, user vlan and multicast group IP address that IGMP Report message is carried, and message sink mouth and bind preservation with the M-VLAN that this multicast ip address is bound; When receiving IGMP Leave message, only the transmission of the corresponding VLAN on set port IGMP Query message gets final product.Under the simple situation of configuration, improved the user side bandwidth utilization.
Description of drawings
Fig. 1 is for realizing that based on port multicast leaves schematic configuration diagram;
Fig. 2 realizes the method flow sketch map of multicast for the present invention;
Fig. 3 realizes the method flow sketch map of multicast for the specific embodiment of the invention;
Fig. 4 realizes the structural representation of the equipment of multicast for the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, scheme according to the invention is done to describe in detail further.
Have multicast functionality as long as realize equipment of the present invention, as have switch, router, HUB, epon of multicast functionality etc.In the specific descriptions of method embodiment, be example with the switch for convenience, and this switch have multicast functionality hereinafter.
Referring to Fig. 2, Fig. 2 realizes the method flow sketch map of multicast for the present invention.Concrete steps are:
In this step relevant information is bound after the preservation, obtain the multicast traffic stream that user side needs, and, the multicast traffic stream that obtains is duplicated and send to the user side relative users according to message sink mouth and the user vlan preserved from network side.
In this step after user side has sent IGMP Query message; If in preset query timeout time and query timeout number of times, receive user's response of the IGMP Query message that sends; Then continue to send in the user vlan scope on this message sink mouth this multicast data flow; Otherwise message sink mouth, user vlan, multicast group IP address and the M-VLAN of the correspondence of preserving bound in deletion.
Through specific embodiment, describe the whole process that multicast is realized in detail below with reference to accompanying drawing.
Referring to Fig. 3, Fig. 3 realizes the method flow sketch map of multicast for the specific embodiment of the invention.Its concrete steps are:
Mostly present multicast service is paid service, must control user's access rights, is not obtaining before the authority, and the user can not visit specific multicast service.This restriction can also further expand to different multicast services providers; The multicast service that different providers provide is bound with different M-VLAN; The corresponding different multicast ip address of different multicast services; Thereby isolate different multicast sources, improve the manageability and the manageability of multicast service.
The realization of multicast functionality also depends on some miscellaneous functions, multicast forwarding list item ageing time for example, query timeout time, query timeout number of times etc.These parameters can preestablish according to practical application.
Switch is opened multicast functionality, and multicast task or process will be monitored the multicast protocol message.
Switch is received the multicast protocol message, and it is resolved.
The list item of setting up in this step is referring to table 1, and table 1 is a multicast forwarding list item of the present invention.
| The message sink mouth | User vlan | Multicast group ip address | M-VLAN | Other |
Table 1
In the table 1, the message sink mouth is for receiving the port numbers of IGMP Report message; User vlan is the vlan number that IGMP Report message carries; Multicast group ip address is the multicast group ip address of configuration in the step 302; M-VLAN is the M-VLAN number of configuration in the step 302; Other are used for the user preserves out of Memory according to actual needs.
With Fig. 1 is example, supposes that user 1 is the multicast traffic stream of 239.1.1.2 to switch request multicast group ip address, sends IGMP Report message to switch.And the user vlan at user 1 place is VLAN 1; The receiving port of Report message is port 1; The data flow of multicast group 239.1.1.2 is configured in VLAN 200; Therefore to carry user vlan be VLAN1 to the IGMP Report message that sends to switch of user 1; Multicast group IP address is 239.1.1.2; Port port 1 through switch gets into switch, on switch, finds the M-VLAN 200 of binding through multicast group IP address.
Switch is received the IGMP Report message that user 1 sends; With packet parsing; User vlan and multicast group ip address that IGMP Report message is carried, and message sink mouth and the M-VLAN of binding with multicast ip address that on switch, obtains are bound and are stored in during multicast group transmits.Referring to table 2, table 2 is a specific embodiment of the invention multicast forwarding list item.
Table 2
If the user of other VLAN sends IGMP Report message, each above-mentioned information stores that switch also carries IGMP Report message is in the multicast group that switch is set up is transmitted.For different M-VLAN or user port etc., multicast forwarding list item of switch uniform maintenance also can be safeguarded different multicast forward tables respectively, makes things convenient for practical implementation according to the user.
The multicast forwarding list item for this multicast list is provided with timer, writes down corresponding multicast forwarding-table item ageing time after setting up.In ageing time; If receive the IGMP Report message that user side is sent; And the message sink mouth of this IGMP Report message, the user vlan that carries and multicast group IP address; And bound in the multicast forwarding list item with the M-VLAN that this multicast ip address is bound and to have preserved, then upgrade the ageing time of corresponding multicast forwarding-table item; Otherwise, delete corresponding multicast forwarding-table item.
With corresponding information bind be stored in the multicast forwarding list item after, switch sends the IGMPReport message to network side, the multicast traffic stream of asking its user to need.Under the situation of the same multicast group of a plurality of user applies, switch can also be launched the proxy function, and a plurality of Report messages are merged processing.
Step 309 is received the multicast traffic stream of network side transmitted, according to multicast forwarding list item duplicated multicast data flow and send to relative users.Execution in step 314.
The foundation that multicast traffic stream duplicates is to bind message sink mouth and the user vlan of preserving in the multicast forwarding list item.With Fig. 1 is example, and the multicast traffic stream that user 1 is asked duplicates and send to each user under the VLAN1 on the port1.
Step 311, if switch finds corresponding multicast forwarding list item, the multicast group IP address of leaving according to message sink mouth, user vlan and IGMP Leave message request generates and sends IGMP Query message.
When switch is received IGMP Leave message; User vlan and the multicast group IP address that to carry according to message sink mouth and IGMP Leave message; And with the M-VLAN of this multicast group IP address binding; In the multicast forwarding list item, search; Preserve the corresponding multicast forwarding list item existence of information if find above-mentioned binding; Then generate IGMP Query message, and in the user vlan scope of the correspondence on the message sink mouth of this IGMP Leave message all users send ask to leave the IGMP Query message of multicast group IP address; For example, the Report message sink mouth in the multicast forwarding list item is port1, and corresponding user vlan is VLAN1, then sends in the VLAN1 scope of this IGMP Query message on the port1 port.
According to whether the user response inquiry is arranged in the corresponding user vlan scope of the Report message sink mouth in the multicast forwarding list item, judge the user who whether still has this multicast group in this scope.
In preset query timeout time and query timeout number of times, switch is not received user response query message in the user vlan scope corresponding on the Report message sink mouth in the multicast forwarding list item, then deletes this corresponding multicast forwarding list item.And the informing network side, user vlan and corresponding multicast that this multicast forwarding list item middle port is corresponding are no longer handled.For example, the Report message sink mouth in the multicast forwarding list item is port1, and corresponding user vlan is VLAN1, and multicast group ip address is 239.1.1.2, and then no longer to handle the multicast that port1 goes up VLAN1 be the message of 239.1.1.2 to the informing network side.
Step 314 finishes.
Based on same inventive concept, the present invention also proposes a kind of equipment of realizing multicast.This equipment has multicast functionality.Referring to Fig. 4, Fig. 4 realizes the structural representation of the equipment of multicast for the present invention.This equipment comprises: first receiving element 401, memory cell 402, second receiving element 403, processing unit 404 and transmitting element 405.
First receiving element 401 links to each other with memory cell 402, is used to receive the IGMPReport message that user side is sent.
Second receiving element 403 links to each other with processing unit 404, is used to receive the multicast protocol that user side sends and leaves IGMP Leave message.
Transmitting element 405, in the user vlan scope of IGMP Query message on the message sink mouth of IGMP Leave message that processing unit 404 is generated all users send ask to leave the IGMP Query message of multicast group IP address.
Preferably,
First receiving element 401 links to each other with processing unit 404, is further used for obtaining the multicast traffic stream that user side needs from network side.
Transmitting element 405 is further used for the multicast traffic stream that processing unit 404 duplicates is sent to the user side relative users.
Preferably,
Transmitting element 405 if be used for second receiving element 403 is received the IGMP Query message that sends in preset query timeout time and query timeout number of times user's response, then continues to send in the user vlan scope on this message sink mouth this multicast data flow.
Preferably,
Preferably,
In sum; When the present invention receives IGMP Report message in the apparatus with multicast functionality; Need not extra manual configuration, the M-VLAN of message sink mouth, user vlan, multicast group IP address and this address binding is stored in the multicast forwarding list item.When equipment obtains the multicast traffic stream of user side request, duplicate and send to the user side relative users according to the multicast forwarding list item, therefore, the multicast packet copy-point is reduced to equipment from router, reduce the Access Network burden.When apparatus is received IGMP leave message, send IGMP Query message according to the multicast forwarding list item, distinguish the user with littler granularity, dwindle IGMP Query message range of transmission, under the simple situation of configuration, improved the user side bandwidth utilization.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the method that realizes of a multicast is characterized in that said method comprises:
When receiving the multicast protocol report IGMP Report message that user side sends; With the message sink mouth of said IGMP Report message, user's virtual LAN VLAN of carrying and multicast group IP address, and bind preservation with the M-VLAN of this multicast group IP address binding;
Receive when multicast that user side is sent leaves IGMP Leave message; If in the information that said binding is preserved, find the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And with the M-VLAN of this multicast group IP address binding, then generate all users in IGMP Query message and the user vlan scope on the message sink mouth of said IGMP Leave message send ask to leave the multicast protocol inquiry IGMP Query message of multicast group IP address.
2. method according to claim 1; It is characterized in that; With the message sink mouth of said IGMP Report message, the VLAN that carries and multicast group IP address, and bind after the preservation with the M-VLAN of this multicast group IP address binding, said method further comprises:
Obtain the multicast traffic stream that user side needs from network side, and, said multicast traffic stream is duplicated and send to the user side relative users according to binding message sink mouth and the user vlan of preserving.
3. method according to claim 1 and 2 is characterized in that, after user side sent IGMP Query message, said method further comprised:
If in preset query timeout time and query timeout number of times, receive user's response of the IGMP Query message that sends; Then continue to send in the user vlan scope on the message sink mouth that this binding is preserved this multicast data flow; Otherwise, delete message sink mouth, user vlan, multicast group IP address and M-VLAN that said binding is preserved.
4. method according to claim 3; It is characterized in that; Described method further comprises: set up the multicast forwarding list item in advance, said message sink mouth, user vlan, multicast group IP address and M-VLAN binding are kept in the said multicast forwarding list item.
5. method according to claim 4; It is characterized in that; Said message sink mouth, the user vlan that carries and the multicast group IP address that finds the said IGMP Leave message of bind preserving, and with the method for the M-VLAN of this multicast group IP address binding be:
According to the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And with the M-VLAN of this multicast group IP address binding, in said multicast forwarding list item, find and bind corresponding message sink mouth, user vlan, multicast group IP address and the M-VLAN of preserving.
6. the equipment that multicast is realized is characterized in that said equipment comprises: first receiving element, memory cell, second receiving element, processing unit and transmitting element;
Said first receiving element links to each other with said memory cell, is used to receive the multicast protocol report IGMP Report message that user side is sent;
Said memory cell; Link to each other with said processing unit; Be used for said first receiving element is received the message sink mouth of IGMP Report message, user's virtual LAN VLAN of carrying and multicast group IP address, and bind preservation with the M-VLAN of this address binding;
Said second receiving element links to each other with said processing unit, is used to receive the multicast protocol that user side sends and leaves IGMP Leave message;
Said processing unit; Link to each other with said transmitting element; Be used for said IGMP Leave message according to said second receiving element reception; In the information that said memory cell binding is preserved, find the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And during with the M-VLAN of this multicast group IP address binding, generate multicast protocol inquiry IGMP Query message;
Said transmitting element, all users send the multicast protocol that institute asks to leave multicast group IP address and inquire about IGMP Query message in the user vlan scope of IGMP Query message on the message sink mouth of said IGMP Leave message that said processing unit is generated.
7. equipment according to claim 6 is characterized in that,
Said first receiving element links to each other with said processing unit, is further used for obtaining the multicast traffic stream that user side needs from network side;
Said processing unit is further used for, and the multicast traffic stream with said first receiving element obtains duplicates according to binding message sink mouth and the user vlan preserved;
Said transmitting element is further used for the multicast traffic stream that said processing unit duplicates is sent to the user side relative users.
8. want 6 or 7 described equipment according to right, it is characterized in that,
Said processing unit; If be further used for said second receiving element is not received said IGMP Query message in preset query timeout time and query timeout number of times user's response, the deletion memory cell is bound message sink mouth, user vlan, multicast group IP address and the M-VLAN of preserving;
Said transmitting element; If be used for said second receiving element is received the IGMP Query message that sends in preset query timeout time and query timeout number of times user's response, then continue to send in the user vlan scope on this message sink mouth this multicast data flow.
9. equipment according to claim 8 is characterized in that,
Said memory cell is further used for setting up the multicast forwarding list item, message sink mouth, user vlan, multicast group IP address and M-VLAN is bound be kept in this multicast forwarding list item.
10. equipment according to claim 9 is characterized in that,
Said processing unit; Be used for according to the message sink mouth of said IGMP Leave message, the user vlan that carries and multicast group IP address; And with the M-VLAN of this multicast group IP address binding, find in the multicast forwarding list item in said memory cell and bind corresponding message sink mouth, user vlan, multicast group IP address and the M-VLAN of preserving.
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| CN103259675A (en) * | 2013-04-11 | 2013-08-21 | 深圳市共进电子股份有限公司 | Method for realizing isolation of internet protocol television (IPTV) service messages between ports |
| CN103259675B (en) * | 2013-04-11 | 2016-04-13 | 深圳市共进电子股份有限公司 | The implementation method that a kind of interactive network TV service message is isolated between port |
| CN104079418A (en) * | 2014-05-28 | 2014-10-01 | 上海斐讯数据通信技术有限公司 | Processing method for simplifying multicast messages |
| CN104079418B (en) * | 2014-05-28 | 2018-07-31 | 上海斐讯数据通信技术有限公司 | A kind of processing method of simplified multicast message |
| WO2016197793A1 (en) * | 2015-06-08 | 2016-12-15 | 中兴通讯股份有限公司 | Method and device for implementing multicast service |
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| CN102355358B (en) | 2013-09-25 |
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