CN100583776C - Network device internal node reliable multicast method, system and device - Google Patents
Network device internal node reliable multicast method, system and device Download PDFInfo
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Abstract
The multicast method adopted for the equipment and system provided in instance of the invention is as following: data are divided into data slots at source node SN, each data slot is packaged and identified, which is sent to all destination nodes DN directly through multicast mode; after receiving data slots, DN replies acknowledge information with ID of data slot to middle node MN; when finding that all affiliated DN reply acknowledge information, MN sends uniform acknowledge information with ID of data slots to SN. Under large numbers of inner nodes of network device, hierarchical acknowledge meets requirement of data multicast so as to raise expandability of node of whole network device.
Description
Technical field
The present invention relates to technical field of multicast, relate in particular to method, system and the equipment of network device internal node reliable multicast.
Background technology
Along with the continuous expansion of global network, professional enriches constantly, and function, the performance demands of the network equipment also constantly improved.Need often to carry out data interaction between each node of network device internal controlling better and to manage, this data interaction can be divided into the multicast mode of point-to-point mode of unicast and point-to-multipoint from the transmission form.The efficient of network device internal node transfer of data, performance and reliability are important indexs during the network equipment is used.But these several indexs are difficult to reach simultaneously optimum, and as when network bandwidth utilization ratio is too high, data transmission efficiency descends on the contrary.Equally, in order to improve reliability of data transmission, will inevitably reduce efficiency of transmission.Therefore, how to make these several indexs all reach very high requirement, implement and have certain degree of difficulty, especially for the multicast mode.
The multicast mode that generally adopts in the prior art is the mode of multinode clean culture set.This mode can be summarized as: as SN (the Source Node that sends data, when source node) the request multicast sends, that this node will be done is exactly each DN (the Destination Node that travels through in the multicast group, destination node), the transmission of data is serial i PC (Inter-Process Communication for each DN basically, interprocess communication) transmission, realize transfer of data in this way, and have a state table to deposit in the multicast group each DN the response condition of this transmission at SN to all multicast group DN.
The transmission means that this technical scheme adopted not is a reliable multicast truly, because for a certain moment, have only a node can receive the data that SN transmits, although finally can both be with transfer of data to DN by traversal, but such transmission means efficient is very low, if there is a large amount of network equipment nodes to adopt this transmission means, its efficiency of transmission can't meet the demands.Therefore, this scheme is supported not enough to the extensibility of whole network equipment node.In addition, for each DN, the transmission reliability of data is guaranteed by each clean culture.
For overcoming the problem of such scheme inefficiency, can adopt the scheme of following reliable multicast: SN sends data by broadcast mode, those nodes that belong to multicast group will receive and handle these data, be similar to UDP multicast (User Datagram Protocol multicast, User Datagram Protoco (UDP) multicast) mode.In order to guarantee reliable transmission, each DN that receives data will reply confirmation ACK (ACKnowledgement confirms) to SN, if through the regular hour, SN does not receive the affirmation information from all DN, then retransmits the data slot of previously lost.
Compare for the scheme of multinode mode of unicast set with above-mentioned multicast mode, owing to need not to realize multicast by the mode of traversal node, efficiency of transmission improves.Yet, because needing to reply confirmation, each DN in the multicast group gives the SN that sends data, when the quantity of DN is a lot, must cause a large amount of affirmation information to send to SN, make SN handle constantly at this that over-burden, the handling property that SN probably occurs is not enough and abandon the situation of confirmation, if SN retransmits when can not receive confirmation and confirms then can further reduce disposal ability.As seen, this method reduces system reliability and the information processing completeness of SN.Therefore, similar with the technical scheme of the above-mentioned multicast mode set that is the multinode mode of unicast, this scheme obviously can not adapt to the situation of large number quipments node, is unfavorable for the expansion of network equipment node.
As seen, all there is the problem of extensibility deficiency in above-mentioned two schemes, for the situation with a large amount of network equipment nodes, can't realize reliable multicast.
Summary of the invention
The technical problem that the embodiment of the invention will solve provides method, system and the equipment of network device internal node reliable multicast, to realize having the reliable multicast of a large amount of network equipment nodes.
For solving the problems of the technologies described above, the purpose of the embodiment of the invention is achieved through the following technical solutions:
At first, the embodiment of the invention provides a kind of method of network device internal node reliable multicast, and this method comprises:
Source node S N directly transmits to all destination node DN by the multicast mode after data being divided into data slot and each data slot being encapsulated into corresponding data sheet segment identification;
DN receives after the described data slot, replys the affirmation information of having carried described data slot sign to the middle node MN of managing it;
When the DN under MN finds had replied confirmation, transmission had been carried the unified confirmation of described data slot sign to SN; Also carried in the described unified confirmation and be used to limit the minimum advertised window value that SN sends the multicast packet fragment continuously.
Preferably, if SN does not receive the described unified confirmation of carrying the data slot sign that all MN send in the default time, then retransmit described data slot by the multicast mode.
Wherein, described MN progression is during greater than one-level, and after MN received the described unified confirmation that affirmation information that DN replys or the MN of its subordinate reply, immediate superior MN under it or SN replied described unified confirmation.
Wherein, described data slot is designated the data slot sequence number.
Optionally, in described data transfer procedure, have new node by selected MN to described SN request and when adding multicast group, SN number notifies described new node and affiliated MN thereof with the current data fragment sequence.
Optionally, retransmit the data slot that is transmitted before described new node adds by multicast mode or mode of unicast to described new node.
Preferably, when described data slot re-transmission surpasses default number of retransmissions, then no longer retransmit.
The embodiment of the invention also provides a kind of reliable multicast system, and this system comprises: source node equipment, destination node equipment and one-level intermediary device at least, wherein:
Source node equipment, data are divided into data slot, directly send to destination node equipment by the multicast mode after each data slot is encapsulated into corresponding data sheet segment identification, receive the unified confirmation of having carried described data slot sign that intermediary device is replied; Also carried in the described unified confirmation and be used to limit the minimum advertised window value that SN sends the multicast packet fragment continuously;
Intermediary device, the affirmation information of having carried described data slot sign that destination node equipment under receiving sends, all destination node equipment under judging whether have all been replied confirmation, and when all affiliated destination nodes have all been replied confirmation, send the unified confirmation of having carried described data slot sign to source node equipment;
Destination node equipment, the receiving multicast data fragment, and after receiving described data slot, reply the affirmation information of having carried described data slot sign to the intermediary device of managing it.
Preferably, when described source node equipment also is used for not receiving described unified confirmation in the default time, retransmit described data slot.
The embodiment of the invention also provides a kind of network equipment, this equipment comprises: first node and Section Point, wherein: described first node, be used to receive multicast packet fragment from other network equipments, and when receiving described data slot, reply the affirmation information of having carried described data slot sign to described Section Point;
Described Section Point is used to receive first node and receives the affirmation information of having carried the data slot sign that sends behind the data slot; All first nodes of adding multicast group under judging whether have all been replied confirmation, and when all having replied confirmation, trigger transmitting element and send the unified confirmation of having carried described data slot sign; The unified confirmation that described data slot sign has been carried in transmission arrives described other the network equipment; Also carried in the described unified confirmation and be used to limit the minimum advertised window value that SN sends the multicast packet fragment continuously.
As can be seen from the above technical solutions, because carrying out classification by selected MN confirms, SN can not receive a large amount of affirmation information simultaneously, so alleviated the processing pressure when SN carries out validation of information, thereby the not enough situation that causes SN to abandon the part confirmation of the disposal ability that can not cause SN owing to a large amount of validation of information, strengthened system reliability and the information processing completeness of SN; Because the mode that this classification is confirmed can satisfy the needs that carry out the data multicast under a large amount of network device internal node situations, therefore, has improved the extensibility of whole network equipment node, and then, improved the treatment effeciency of network system, saved system resource.
In addition, come the node adding or withdraw from multicast group to manage, alleviated the processing pressure of SN, thereby further strengthened the extensibility of network-internal apparatus node, improved system effectiveness by MN.
As seen, DN is confirmed and manage by hierarchical approaches, can be so that network system to be disposed more flexibly, performance is more superior.
Description of drawings
Fig. 1 is the reliable multicast flow chart of one embodiment of the invention;
Fig. 2 is the reliable multicast flow chart of another embodiment of the present invention;
Fig. 3 is that the reliable multicast in one embodiment of the invention sends and receive schematic diagram;
Fig. 4 is the data validation schematic diagram in one embodiment of the invention;
Fig. 5 is a kind of apparatus for network node structural representation in one embodiment of the invention.
Embodiment
For the advantage and the feature that make the embodiment of the invention is clearer, be further described with reference to the accompanying drawings.
At first, the technical scheme that the embodiment of the invention provided provides a kind of method of network device internal node reliable multicast, is elaborated by the following examples.
Embodiment one, at first be that example describes with the reliable multicast between several the routers.With reference to accompanying drawing 1, accompanying drawing 3 and 4, Fig. 1 is the reliable multicast flow chart of present embodiment, and Fig. 3 is that the reliable multicast in the present embodiment sends and the reception schematic diagram, and Fig. 4 is the data validation schematic diagram in the present embodiment.
Step 11: determine to be used for managing the MN of DN, it is a multicast group of data source nodes that DN adds with SN by MN;
Master control borad at a router sends data as SN, under the situation of the business board of other router as the DN receiving multicast data, main control device in these business board place machine frames can be managed the business board in this router as MN, SN, DN, MN are respectively shown in 31,32,33 among Fig. 3 and Fig. 4.
Each multicast group all has a unique multicast address, add this multicast group after, DN begins to intercept the data from this multicast address, prepare to receive.
Step 12:SN directly sends to DN with each data slot packing back by the multicast mode according to the big young pathbreaker's data fragmentation of MTU (Maximum Transmission Unit, MTU);
MTU is the maximum data packet that can transmit on the network, and its unit is a byte, and packet is excessive to increase the packet loss in the transport process in order to avoid, and should transmit according to the big young pathbreaker's data fragmentation of MTU.Certainly, if the packet that is sent is very little, just do not need burst, burst not can be considered the data that will will send and only is divided into a slice.
In order to realize peer layer communication, before data need be sent to another node from a node by network, must add certain protocol head (with the agreement tail) at the head (and afterbody) of data.The process of this increase data head (and afterbody) is called packing data or data encapsulation.Equally, behind the peer layer of data arrival receiving node, the recipient will discern, extract and handle the data head (and afterbody) that the transmit leg peer layer increases.This process that the data head (and afterbody) that increases is removed of recipient is called that data are unpacked or the data deblocking.
The data slot sequence number that encapsulates this data slot at the head of packet identifies as data slot, and the initial data fragments sequence number can produce at random, and the follow-up data fragments sequence number increases successively.The head of packet also can be provided with verification and wait control information.
When step 13:DN receives the multicast packet fragment of SN transmission, reply confirmation, carry the sequence number of this data slot in the confirmation to affiliated MN.
DN can directly send to described MN with the affirmation information that comprises this data slot sequence number after receiving the data slot of SN transmission.But, the frequent affirmation of data can make network load increase, especially the control information of packet head, also can take unnecessary bandwidth, in order to increase bandwidth usage efficient, can transmit and send a total affirmation information behind several data slots, as, after DN receives that the data slot sequence number is 5 data fragments of 1 to 5, carry the data slot sequence number in the confirmation and be 5 and all receive with regard to the data slot of representative data fragment sequence number from 1 to 5.
Step 14: when the DN under MN finds has replied confirmation, send unified affirmation information, carry the data slot sequence number in the unified affirmation information to SN.
SN just can confirm that according to the data slot sequence number that carries in the confirmation this data slot transmits successfully.
Embodiment two, for strengthening the reliability that data transmit, the foregoing description is done further to optimize, be specially after the step 14 of the foregoing description one, in the following way:
If SN does not receive the unified confirmation of all MN in the default time, think that then the DN that has does not receive this data slot, and adopt the multicast mode to retransmit this data slot.
After the re-transmission,, illustrate to retransmit successfully if SN has received the unified confirmation of all MN in the default time.If in the default time, also do not receive the unified confirmation of all MN, can continue to retransmit.
Consider the influence of re-transmission to efficiency of transmission, can preset number of retransmissions, if after having reached the number of retransmissions of presetting, SN still can't receive the unified confirmation of all MN in the default time, also, still have DN can't receive data, then no longer retransmits.
Embodiment three, in the multicast packet transport process, if there is new node request to add multicast group as the DN receiving multicast data, can be in the following way, with reference to flow chart shown in Figure 2.
Step 21:SN when receiving new node when adding the request of this multicast group, number notifies this DN and affiliated MN thereof with the current data fragments sequence that will send in the process that multicast packet sends;
SN is in the process that multicast packet sends, when receiving the request of this multicast group of adding that new node sends by the pairing MN of this node, number notify MN under this DN with the current data fragments sequence, MN notifies this DN with the sequence number of the data slot of the current transmission of SN, subsequently, the homing sequence of confirming as the MN under SN and this node with this sequence number number.
Step 22:SN transmits this data slot by multicast mode all DN in multicast group;
After step 23:DN receives this data slot, reply the affirmation information of having carried the data slot sequence number to affiliated MN;
DN under step 24:MN finds has replied confirmation, replys the unified confirmation of having carried described data slot sequence number and gives SN.
Other data slot sends in the same way successively, receives and confirms.
At initiate node among the embodiment three, because some data slot does not receive before, if not variation after this partial data in order to guarantee reliable multicast, then needs to retransmit.Owing to be that single node does not receive data only, therefore, can consider to retransmit the data slot that does not before have reception with the mode of clean culture, that is: SN will before not have the data slot of transmission to be sent to this initiate node successively according to the sequence number order.
Certainly, if in data transmission procedure, being carved with a plurality of nodes when different adds, can be with the received data slot of the node of last adding as last data slot that retransmits, employing multicast mode retransmits and confirms, concrete mode is similar to above-mentioned several embodiment, is not described in detail.
Also can adopt the mechanism of sliding window to come the flow of DN is controlled.Be specially: DN can be according to the size of this section dot buffer zone, can also receive the capacity of data to the MN announcement by the minimum advertised window value in the confirmation, a notice SN of the minimum advertised window value of the affirmation Information Selection that MN returns according to DN minimum, the size of the minimum advertised window value in the affirmation information returned according to MN of SN then, carrying out data sends, thereby make SN before wait acknowledge information, can send a plurality of data slots continuously, unless minimum advertised window value is 0 according to the size of minimum advertised window value.The wait acknowledge because SN needn't data fragment of every transmission just stops, transmission that therefore can expedited data.
When run into that SN sends fast and during DN receives slow situation, minimum advertised window can very fast data by SN be filled up, the minimum advertised window value of DN this moment size is set to 0, and notifies SN in confirmation, and then SN stops to send data.Application program in DN is taken the size of upgrading minimum advertised window value after the data away, and SN can continue to send data.
For in data transfer procedure, the situation that has node to drop by the wayside, MN under only need request being sent to by this node, MN is reported to SN, SN withdraws from this node multicast group and makes response, and after this this node does not receive the data that described SN sends, and MN does not wait for returning of this node confirmation yet, unless this node adds this multicast group again, repeats no more.
It should be noted that technical scheme that the embodiment of the invention provides to the hierarchical layer number of times of MN without limits.MN at different levels only manage one's own downstream site information, and MN at different levels only handle the affirmation information that one's own downstream site sends, after the affirmation information of all downstream sites under intermediate nodes at different levels receive, send the SN of unified affirmation information to even higher level of node or transmission multicast packet.
Below for the embodiment of the invention provided a kind of network multicast system, with reference to Fig. 3 and 4, this system comprises source node equipment 31, intermediary device 32 and destination node equipment 33, wherein:
In order to strengthen the data transmission credibility of multi-cast system, in source node equipment 31, timer can be set, if when in the default time, not receiving described unified confirmation, trigger described data slot and retransmit.
The foregoing description is that intermediary device is the situation of one-level, intermediary device is according to the complexity of multi-cast system, multistage intermediary device can be arranged, the affirmation information of the destination node equipment under intermediary device is used to receive or the unified confirmation of its direct subordinate intermediary device, and all the destination node equipment under it or intermediary device be when all having replied confirmation or unified confirmation, to its higher level's intermediary device or unified affirmation information of source node device replied under directly.
More than each node device all can be a concrete physical entity, also can be an assembly in a certain physical entity, or the process of moving in a certain physical entity, those skilled in the art can be applied to different scenes according to different needs.
Below a kind of apparatus for network node of providing for the embodiment of the invention, with reference to Fig. 5, this equipment comprises receiving element 51, judging unit 52, transmitting element 53, wherein:
Receiving element 51 receives the affirmation information of having carried the data slot sequence number after other apparatus for network node receives data slot;
Judging unit 52, the all-network node device that judges whether affiliated adding multicast group according to the affirmation information that receives has all been replied confirmation, and when all having replied confirmation, trigger transmitting element 53 and send described unified confirmation of carrying the data slot sequence number;
Transmitting element 53 sends the unified confirmation of having carried described data slot sequence number and arrives described definite apparatus for network node.
This apparatus for network node not necessarily is exactly a concrete physical entity, also can be an assembly in a certain physical entity, or the process of moving in a certain physical entity, can be applied to suitable scene according to different needs.
From above each embodiment as can be seen, confirm to have avoided when a large amount of apparatus for network node a large amount of confirmations to reply the problem that causes source node device processes scarce capacity by classification, this network multicast mode makes that the extensibility of system is strong, still can keep higher system reliability and efficiency of transmission when a large amount of network equipment node.
By retransmitting the further multi-cast system reliability of data transmission that strengthened, improved systematic function.
Make and under the situation that guarantees the system transmissions reliability, further improve efficiency of transmission and set number of retransmissions and minimum advertised window value, saved system resource.
More than method, system and the equipment of a kind of network device internal node reliable multicast that the embodiment of the invention provided is described in detail, the explanation of above embodiment just is used for helping to understand method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the method for a network device internal node reliable multicast is characterized in that, comprising:
Source node S N directly transmits to all destination node DN by the multicast mode after data being divided into data slot and each data slot being encapsulated into corresponding data sheet segment identification;
DN receives after the described data slot, replys the affirmation information of having carried described data slot sign to the middle node MN of managing it;
When the DN under MN finds had replied confirmation, transmission had been carried the unified confirmation of described data slot sign to SN; Also carried in the described unified confirmation and be used to limit the minimum advertised window value that SN sends the multicast packet fragment continuously.
2. the method for network device internal node reliable multicast as claimed in claim 1 is characterized in that, further comprises:
If SN does not receive the described unified confirmation of carrying the data slot sign that all MN send in the default time, then retransmit described data slot by the multicast mode.
3. the method for network device internal node reliable multicast as claimed in claim 2, it is characterized in that, described MN progression is during greater than one-level, after MN received the described unified confirmation that affirmation information that DN replys or its direct MN of subordinate reply, immediate superior MN under it or SN replied described unified confirmation.
4. as the method for claim 1,2 or 3 described network device internal node reliable multicasts, it is characterized in that described data slot is designated the data slot sequence number.
5. as the method for claim 1,2 or 3 described network device internal node reliable multicasts, it is characterized in that, further comprise:
In described data transfer procedure, have new node by selected MN to described SN request and when adding multicast group, SN number notifies described new node and affiliated MN thereof with the current data fragment sequence.
6. the method for network device internal node reliable multicast as claimed in claim 5 is characterized in that, further comprises:
Retransmit the data slot that is transmitted before described new node adds by multicast mode or mode of unicast to described new node.
7. the method for network device internal node reliable multicast as claimed in claim 2 is characterized in that, when described data slot re-transmission surpasses default number of retransmissions, then no longer retransmits.
8. a reliable multicast system is characterized in that, comprising: source node equipment, destination node equipment and one-level intermediary device at least, wherein:
Source node equipment, data are divided into data slot, directly send to destination node equipment by the multicast mode after each data slot is encapsulated into corresponding data sheet segment identification, receive the unified confirmation of having carried described data slot sign that intermediary device is replied; Also carried in the described unified confirmation and be used to limit the minimum advertised window value that source node equipment sends the multicast packet fragment continuously;
Intermediary device, the affirmation information of having carried described data slot sign that destination node equipment under receiving sends, all destination node equipment under judging whether have all been replied confirmation, and when all affiliated destination nodes have all been replied confirmation, send the unified confirmation of having carried described data slot sign to source node equipment;
Destination node equipment, the receiving multicast data fragment, and after receiving described data slot, reply the affirmation information of having carried described data slot sign to the intermediary device of managing it.
9. reliable multicast as claimed in claim 8 system is characterized in that, when described source node equipment also is used for not receiving described unified confirmation in the default time, retransmits described data slot.
10. an apparatus for network node is characterized in that, comprising: receiving element, transmitting element, judging unit, wherein:
Receiving element receives other apparatus for network node and receives the affirmation information of having carried the data slot sign that sends behind the data slot;
Judging unit, the all-network node device of the adding multicast group under judging whether has all been replied confirmation, and when all having replied confirmation, triggers transmitting element and send the unified confirmation of having carried described data slot sign; Also carried in the described unified confirmation and be used to limit the minimum advertised window value that source node sends the multicast packet fragment continuously;
Transmitting element sends to have carried described data slot sign and to be used to limit the unified confirmation that source node sends the minimum advertised window value of multicast packet fragment continuously and arrives source node.
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| WO2011130316A1 (en) | 2010-04-12 | 2011-10-20 | Qualcomm Atheros, Inc. | Repeating for low-overhead communication in a network |
| US8634419B2 (en) * | 2010-12-01 | 2014-01-21 | Violin Memory Inc. | Reliable and fast method and system to broadcast data |
| CN105376165B (en) * | 2015-10-15 | 2019-02-22 | 深圳市金证科技股份有限公司 | UDP method of multicasting, system, sending device and reception device |
| CN107580298A (en) * | 2016-06-30 | 2018-01-12 | 中兴通讯股份有限公司 | A kind of calling-control method and terminal |
| CN106330408B (en) * | 2016-08-25 | 2020-03-27 | 安徽小木文化科技有限公司 | Data transmission system and method |
| CN109787903B (en) * | 2019-02-28 | 2021-04-13 | 武汉晟联智融微电子科技有限公司 | Non-collision multicast data feedback method in centralized network |
| CN110022218B (en) * | 2019-03-07 | 2021-06-04 | 金证财富南京科技有限公司 | Multicast communication method, terminal device and storage medium |
| CN112579314A (en) * | 2019-09-30 | 2021-03-30 | 北京国双科技有限公司 | Data information issuing method and device, storage medium and electronic equipment |
| CN110944299B (en) * | 2019-11-19 | 2022-01-21 | 南京英锐祺科技有限公司 | Multicast method and system thereof |
| CN116095611A (en) * | 2021-10-30 | 2023-05-09 | 华为技术有限公司 | Data transmission method, communication device and storage medium for multicast service |
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