CN100486222C - Intelligent transmitting method and system for multicast message - Google Patents

Intelligent transmitting method and system for multicast message Download PDF

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CN100486222C
CN100486222C CNB2005101155941A CN200510115594A CN100486222C CN 100486222 C CN100486222 C CN 100486222C CN B2005101155941 A CNB2005101155941 A CN B2005101155941A CN 200510115594 A CN200510115594 A CN 200510115594A CN 100486222 C CN100486222 C CN 100486222C
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multicast
static
igmp
message
router
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CN1764163A (en
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徐进
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New H3C Technologies Co Ltd
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Hangzhou H3C Technologies Co Ltd
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Abstract

The invention relates to intelligent transmission method for multicast message, which comprises: A. determining common static multicast group of current system by monitoring port traffic and/or adding times and/or adding time; B. active adding current static multicast group on the route interface of static host with intelligent IGMP, and begins to receive the multicast flow; C. when receiving IGMP of current multicast group, it sends the message directly to added user. This invention reduces user adding time delay, increases system response speed, updates timed the current static multicast group, and releases work of network administrator.

Description

The intelligent transmitting method of multicast message and system
Technical field
The present invention relates to the multicast correlative technology field in the network service, particularly relate to a kind of intelligent transmitting method and system of multicast message.
Background technology
Along with the development of multicasting technology, in existing multicast network, adding one from the user, to organize the process that receives corresponding multicast data flow generally be such.At first, the user can to its tip router in the same network segment send a multicast group G IGMP (IGMP, Internet GroupManagement Protocol joins message; After this router receives that this IGMP joins message, find corresponding multicast source S and be established to the multicast forwarding path of S by agreement independent multicast Routing Protocol (PIM, Protocol Independent Multicast); (S G) transmits to the user who adds this group G last router, and at this moment the user just can receive group G data flow with multicast data flow.
Below in conjunction with Fig. 1, for the structural representation of forwarding multicasting message in the prior art illustrates.As shown in Figure 1, the router one 3 that server 14 forwards link to each other with it sends multicast data flow (S, G), if normal hosts 15 needs to receive the multicast data flow of group address G, will join message to the IGMP that the router one 1 that links to each other with it sends group address G, promptly notify router one 1 will receive the multicast data flow of group address G.If described router one 1 the data flow of forwarding group G (S, G), as long as (S, G) interface to normal hosts 15 (recipient) place duplicates a getting final product with multicast data flow.If there is not the recipient who organizes G on the router one 1 at the beginning, when its for the first time when normal hosts 15 receives that the IGMP of group G joins message, will set up from source S to normal hosts 15 multicast forwarding path by the PIM agreement to the direction hop-by-hop (promptly passing through router one 2 and router one 3 and three layers of multicast network) of server 14, and multicast data flow (S the most at last, G) draw to get off, this process is veryer long.
With PIM DM is example, when router R1 receive normal hosts 15 about the group G IGMP join message after, discovery this locality is also flowed (S without any interface at receiving group, G) (promptly local (S, G) outgoing interface of list item is empty), just need the graft packet of router transmission upstream, up to (S G) draws to get off multicast data flow.When network than maximum, when a lot, the forward-path that needs to set up will be very long to the jumping figure of source address, from main frame 15 adding group G to receiving that (S G) will inevitably experience the long time to multicast data flow.
At present, in order to reduce the described process of setting up forward-path, existing a kind of method is: the mode by static configuration adds some multicast group commonly used, and the flow chart of this method sees Fig. 2 for details, and its implementation procedure mainly comprises step:
Step M10: the network manager inserts situation according to flux of multicast on the monitor network and IGMP, determines current the most frequently used multicast group;
Step M11: the mode by manual configuration adds described multicast group commonly used static state, and begins to receive the data message of these multicast group;
Step M12: when user's adding is when using multicast group always, directly the multicast message of this multicast group to be transmitted to the user.
Wherein, described static multicast groups generally is by the manual configuration order, and static state adds on the interface of appointment.Because the static igmp host that adds can not wear out, even if there is not the member to receive, multicast data flow also makes eventually and can transmit to this interface.As shown in Figure 1, so no matter whether the static adding group of certain interface G have main frame to join message to the IGMP of R1 transmission group G on router R1, and R1 can be established to the forward-path of S, and (S G) draws to get off and to the interface forwarding of static state adding group G with multicast data flow.Afterwards, to receive that the IGMP of group G adds fashionable when R1 goes up certain interface, just can be directly flows to its forwarding multicasting that (S G), and does not need the forward-path searching multicast source and be established to the source.
From the above, this method is set up PIM forward-path process by static adding multicast group though saved, and accelerates the time delay of most of user's adding multicast group, has promptly accelerated response speed.But because the multicast group that the user often adds is continuous the variation, for this reason, the network manager needs often to adjust the configuration of these static multicast groups, adds the speed of multicast group with the quickening user, thereby increases the workload that the network manager safeguards.
Summary of the invention
The technical problem that the present invention solves provides a kind of intelligent transmitting method and system of multicast message, to reduce the latency issue that the user adds multicast group, also alleviates keeper's configuring maintenance work simultaneously.
For addressing the above problem, the invention provides a kind of intelligent transmitting method of multicast message, described method comprises step:
A, determine in the current system static multicast groups commonly used;
B, have in configuration of routers on the interface of intelligent IGMP static host and initiatively add described current static multicast groups commonly used, and begin to receive described group multicast data flow;
C, when the IGMP that receives the common static multicast group when router joins message, directly corresponding multicast data flow is transmitted to the user who adds this group.
Situation about joining message by flux of multicast on the monitor network and IGMP in the steps A is determined static multicast groups commonly used in the current system.
Flow by the monitor network upper port and/or add indegree and/or the joining day is determined static multicast groups commonly used in the current system.
Described static multicast groups commonly used comprises: the static multicast groups of port flow maximum and/or maximum static multicast groups and/or the longest static multicast groups of joining day of adding IGMP message number of times.
By reading the flow counting of each port of router, add up the flow of each multicast group in a period of time, and the multicast group of flow maximum in this section period is defined as current static multicast groups commonly used.
Router increases the counting of this multicast group in that to receive that at every turn the new IGMP of user adds fashionable, adds the static multicast groups that the maximum multicast group of indegree is defined as using always in a period of time.
Each multicast group accumulative total the longest multicast group of joining day in statistics a period of time is with its static multicast groups that is defined as using always.
Described method also comprises:
D, when router connects when receiving that for the first time the IGMP that is not multicast group commonly used joins message, need utilize the PIM agreement to set up multicast forwarding path from the source address to the local router step by step.
In the regular hour, refresh the current static multicast groups of using always on the router of intelligent IGMP static host that disposes.
In addition, the present invention also provides a kind of intelligent repeater system of multicast message, and described system comprises:
Local router is used to receive and receive multicast data flow according to the static multicast groups forwarding that adding is used always;
Intelligence IGMP static host is configured on the interface of local router, is used for initiatively adding this system static multicast groups commonly used, and receives the multicast data flow of described multicast group commonly used.
Compared with prior art, the present invention has following beneficial effect: the router that disposes intelligent IGMP static host of the present invention adds situation by flux of multicast on the monitor network and IGMP, determines current the most frequently used a collection of multicast group automatically; Initiatively static then these multicast group commonly used that adds are guided to the multicast data flow of this group on this router; When the user adds these multicast group commonly used, just can directly transmit, significantly reduce user's adding time-delay, thereby improved the speed of response.The present invention simultaneously is these static multicast groups commonly used of regular update also, are current the most frequently used static multicast groups all the time to keep adding multicast group automatically.In addition, the present invention initiatively add current static multicast groups commonly used and do not need user intervention, but automatically select a collection of optimal static multicast group according to certain strategy by system, and it is regularly waken up with a start refresh, keeper's configuring maintenance work greatly alleviated.
Description of drawings
Fig. 1 is the structural representation of forwarding multicasting message in the prior art;
Fig. 2 is the flow chart of the retransmission method of multicast message in the prior art;
Fig. 3 is the flow chart of the intelligent transmitting method of multicast message of the present invention;
Fig. 4 is the application example that the intelligence of multicast message of the present invention is transmitted;
Fig. 5 is the structural representation of the intelligent repeater system of multicast message of the present invention.
Embodiment
Core of the present invention is that router can be determined current the most frequently used a collection of static multicast groups automatically by flux of multicast on the monitor network and IGMP (IGMP, the Internet Group Management Protocol) situation that joins message; Intelligent then IGMP static host initiatively adds these static multicast groups commonly used; The purpose of described adding static multicast groups will be guided to these multicast data flows on the local router exactly.When certain interface on the local router need receive this multicast data flow, just can directly duplicate and transmit to it, to save required multicast data flow is guided to time on this equipment.That is to say, when the user adds these multicast group commonly used, just can be very fast carried out forwarding multicasting message.All the time be current the most frequently used static multicast groups for what keep adding automatically simultaneously, also need these static multicast groups of regular update.
Technical scheme of the present invention is according to certain strategy (static multicast groups and/or the statistics that are the statistic flow maximum add the longest static multicast groups of indegree and/or statistics the longest static multicast groups of joining day), Intelligent Recognition goes out some the most frequently used static multicast groups of active user, and initiatively adds them.When the user adds these the most frequently used static multicast groups again, just do not need to utilize agreement independent multicast Routing Protocol (PIM, Protocol Independent Multicast) set up step by step from receive intelligent IGMP static host to the multicast path of source address by forward-path, the speed of the response of Ti Gaoing greatly.Described active adds static multicast group, and that is to say does not need user intervention, but by system automatically with it as static multicast groups (i.e. the multicast group that can't wear out).In addition, the present invention can also refresh current static multicast groups commonly used regularly, automatically, is the most frequently used multicast group with the static multicast groups that guarantees current adding.Therefore, the present invention has not only improved the speed that the user adds multicast group, reduces joining delay of multicast group, has also reduced the workload that the network manager safeguards simultaneously.
For the ease of the understanding of the present invention, simply introduce following noun involved among the present invention below:
Intelligence IGMP static host: be commonly called as intelligent IGMP static host, this intelligence IGMP static host can be configured on certain interface of multicast router, shows that this interface can add some static multicast groups commonly used automatically, and receives the multicast data flow or the data flow of these groups.This adition process is automatically, and can regularly refresh automatically, so that upgrade current the most frequently used multicast group.Its course of work is specially:
After disposing intelligent IGMP static host, router adds situation with multicast data flow on the automatic monitor network and IGMP, and determines current the most frequently used multicast group according to certain strategy.Intelligence IGMP static host can add these current the most frequently used multicast group automatically, and those no longer static host configurations of multicast group commonly used of regular deletion.The multicast group that will receive as the user be current intelligent IGMP static host added group the time, just can directly receive the multicast message of this group.At set intervals, also can refresh the group that current intelligent IGMP static host adds automatically.
IGMP IGMP: mainly run on main frame and with PIM multicast router that main frame directly links to each other between, be be used for collecting and safeguard the agreement of the network forming member that networks relation, described PIM multicast router is by the IGMP acquired information that joins message, and safeguards that on each interface basis multicast forms the member relation table.By the IGMP agreement, can notify local PIM multicast router to wish to add and receive the information of certain particular multicast group on the one hand, and on the interface basis of each PIM multicast router, safeguard the multicast member relation table; On the other hand, whether the PIM multicast router member that periodically inquires about certain known group in the local area network (LAN) by the IGMP agreement is in active state.
Wherein, described agreement independent multicast Routing Protocol (PIM, Protocol Independent Multicast) be multicast routing protocol a kind of and singlecast router selection protocol-independent, it does not rely on specific unicast routing protocol, is used to instruct duplicating and transmitting of multicast traffic stream.Described IGMP and PIM use usually together, give PIM by the multicast member relation announcement that IGMP is safeguarded.Described PIM guides to the multicast data flow that needs on the corresponding IGMP interface, thereby has realized the forwarding of multicast message.
The present invention is described further below in conjunction with accompanying drawing.
Please see Fig. 3 for details, be the flow chart of the intelligent transmitting method of multicast message of the present invention.Described method comprises step:
Step S10: determine static multicast groups commonly used in the current system;
Step S11: have in configuration of routers on the interface of intelligent IGMP static host initiatively to add described current static multicast groups commonly used, and begin to receive described group multicast data flow;
Step S12: the IGMP that receives the common static multicast group when router joins message constantly, directly corresponding multicast data flow is transmitted to the user who adds this group.
In above-mentioned steps, at first to determine current static multicast groups commonly used in the system according to different strategies (be the flow of port and/or add indegree and/or the joining day).Wherein, described static multicast groups commonly used comprises: the static multicast groups of port flow maximum and/or maximum static multicast groups and/or the longest static multicast groups of joining day of adding IGMP message number of times.Secondly, have in configuration of routers on the interface of intelligent IGMP static host and initiatively add described current static multicast groups commonly used; Like this, the multicast data flow of these multicast group commonly used will be introduced on this router and to this interface and transmit.In fact, described intelligent IGMP static host is not a main frame on the true meaning, but a configuration on the router.That is to say on certain interface, disposed this order after, router is just thought the IGMP static host that is connected with an intelligence on this interface, it can add current the most frequently used static multicast groups.At last, when router receives group address when joining message for the IGMP of multicast group commonly used from certain interface, just can directly transmit the multicast message of this group to this interface.
Specifically describe below according to different strategies, determine the implementation procedure of current the most frequently used static multicast groups automatically.These selected strategies are according to the different incompatible selections of applied field.Described these strategies include but not limited to following enumerating.
First kind of strategy is: the static multicast groups of statistic flow maximum.Can be by the counting of the flow on the port that reads each router, the flow of each multicast group in statistics a period of time.This statistics during this period of time in those multicast group of flow maximum be considered to current the most frequently used static multicast groups.Such as, in nearest 10 minutes,, drawing group and amount to 10000KB for the flow of 225.1.1.1 by adding up the flow of each port, the flowmeter numerical value of so during this period of time organizing 225.1.1.1 is exactly 10000K.This relatively is fit to the more approaching situation of flow-rate ratio of the multicast group of user's program request.Require equipment can support traffic statistics function in this case by multicast group.
Second kind of strategy is: statistics adds the maximum static multicast groups of indegree.Can be when receiving that at every turn the new IGMP of user joins message, just increase the counting (leave after after a while if add the user of multicast group, and then when adding this multicast group again, this situation being exactly to have added this multicast group for the second time) of this multicast group.Statistics adds those maximum multicast group of counting in a period of time, these multicast group are considered to current the most frequently used static multicast groups.Such as, in nearest 10 minutes, multicast group 225.1.1.1 added in the time of the 2nd minute, left after one minute; In the time of the 6th minute, multicast group 225.1.1.1 adds once more and does not leave; The user of the multicast group 225.1.1.1 indegree that adds during this period of time is exactly 2 times like this.The time of the relatively more suitable user's adding group of this strategy is not long, but the many situations of quantity.
The third strategy is: statistics those the longest multicast group of joining day.Can add up the joining day of each group in a period of time.The time that is about to the each adding of each group adds up, and adds up the longest multicast group of joining day in a period of time, and this multicast group is thought current the most frequently used static multicast groups.Such as, in nearest 10 minutes, multicast group 225.1.1.1 leaves after adding 60s for the first time, leaves after for the second time adding 30s again, and the joining day of this multicast group is exactly this group twice joining day sum, i.e. 60s+30s=90s so.This strategy relatively is fit to the long situation of time of user's adding group.
But needing explanation is that strategy of the present invention is not limited to above-mentioned several, can also carry out adaptive change on the basis of above-mentioned strategy.Therefore, more than strategy only for reference, also to engage different environment in the application kind of reality and specifically consider.Certainly, also can comprehensively use these strategies.Its most basic purpose is exactly to reduce the time-delay that the user adds those the most frequently used multicast group.In addition, if adopt that alternate manner can be clear and definite determine which is the most frequently used multicast group, also can use traditional static multicast groups to add simultaneously.
Simultaneously, the present invention is the most frequently used static multicast groups for the current adding of energy assurance system, can make this statistics at set intervals and refresh the static multicast groups of current adding.Described refreshing is meant that adding this adds up preferred static multicast groups, leaves those not static multicast groups in this statistics preferable range simultaneously.Described refresh time need be selected a suitable value according to actual application environment.This be because, if too short meeting of the time of refreshing causes the variation of system too fast and influence its performance, the overlong time that refreshes can cause again the induction speed of statistics variations is descended, thus the user that can delay time adds the time of multicast group.When practical application, different refresh times is set earlier, and the average delay of test adding multicast group under the condition of set various refresh times, the refresh time of selecting then on average to join delay the most in short-term is the refresh time of current static multicast groups.
Also please refer to Fig. 4, be the schematic diagram of the intelligent concrete application example of transmitting of multicast message of the present invention.As shown in Figure 4, if comprise router two 1, router two 2 and router two 3 among this figure; And server 24, intelligent IGMP static host 25 and normal hosts 26.Wherein the router two that links to each other with it of server 24 forwards 3 send multicast data flows (S, G).Described intelligent IGMP static host 25 is not an external entity, but is configured on the interface of router two 1, and it only is a configuration on this router two 1.But, on this router two 1 this configuration has been arranged after, just be equivalent on this router, connect so intelligent IGMP static host 25 (just virtual main frame).Described intelligent IGMP static host 25 adds multicast group commonly used and the data flow of these multicast group is guided on the router two 1.Like this when normal hosts 26 add be these multicast group commonly used the time, just can receive very soon and added the multicast message of this group, because these multicast data flows have arrived router two 1 already.
If certain user (such as subscriber's main station 26) needs the multicast data flow of reception group G, will join message to the IGMP of the router two 1 transmission group G that links to each other with it, promptly notify the intelligent IGMP static host 25 in the router two 1, if when receiving the multicast data flow of group G, directly corresponding multicast message is transmitted to the user or the subscriber's main station 26 that add this group.If do not exist on the router two 1 the multicast forwarding list item of organizing G (S, G), promptly group address D is not current multicast group commonly used, then the implementation with prior art is identical, promptly the mode by static configuration joins this multicast group in the table of this interface; Or multicast data flow is drawn by the direction hop-by-hop of PIM agreement to server.That is to say, if there is not the recipient's (subscriber's main station 26) who organizes G on the router two 1, then subscriber's main station 26 joins message to the router two 1 transmission IGMP that disposes intelligent IGMP static host 25, the PIM agreement (is promptly passed through router two 2 and router two 3 and three layers of multicast network) and sets up the multicast forwarding path from source address S to intelligent IGMP static host 25 step by step, so that intelligent IGMP static host 25 can receive from the multicast data flow of the transmission of source address S, and it is duplicated be forwarded to subscriber's main station 26.In addition, the present invention also provides current multicast group commonly used is refreshed, so that the multicast group of selecting commonly used is the up-to-date multicast group of current slot.Significantly reduced the forwarding time delay.Simultaneously, at set intervals current adding multicast group commonly used being refreshed, and delete those multicast group no longer commonly used, all is current the most frequently used with the multicast group that keeps adding.
This shows, multicast intelligence IGMP static host of the present invention has been inherited common IGMP static host and has been reduced the advantage that the user adds the multicast group time-delay, can select a collection of optimal static multicast group in real time according to certain strategy automatically simultaneously, and it is added automatically dispose in the router of intelligent IGMP static host, in the regular hour section it being refreshed automatically, all is current the most frequently used with the multicast group that keeps adding.Technical scheme of the present invention has not only significantly reduced the forwarding time delay, has also greatly alleviated the burden of configuring maintenance.
In addition, the present invention also provides a kind of intelligent repeater system of multicast message, and the structural representation of its system sees Fig. 5 for details.Described system comprises: send terminal 31, router three 2, three layers of multicast network 33, local router 34, receiving terminal 35 and intelligent IGMP static host 36.Described transmission terminal 31 is used to send multicast data flow; Described router three 2 links to each other with transmission terminal 31, is used to transmit the multicast data flow that receives; Described three layers of multicast network 33 link to each other with router three 2, are used to transmit the multicast data flow that receives; Described local router 34 links to each other with three layers of multicast network 33, is used to receive and receive multicast data flow according to the static multicast groups forwarding that adding is used always; Described receiving terminal 35 links to each other with local router 34, is used to receive the multicast data flow that sends terminal; Described intelligent IGMP static host 36, be configured on the interface of local router, be used for initiatively adding this system static multicast groups commonly used, and receive the multicast data flow of this multicast group commonly used, when the IGMP that receives receiving terminal joins message, directly corresponding multicast message is transmitted to the receiving terminal that adds this multicast group.
The specific implementation that a structure is formed in the said system can not repeat them here with reference to the implementation procedure of method noted earlier.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1, a kind of intelligent transmitting method of multicast message is characterized in that, comprises step:
A, by the situation that flux of multicast on the monitor network and IGMP IGMP join message, determine in the current system static multicast groups commonly used;
B, have in configuration of routers on the interface of intelligent IGMP static host and initiatively add described static multicast groups commonly used, and begin to receive the multicast data flow of described static multicast groups commonly used;
C, when the IGMP that receives static multicast groups commonly used when router joins message, directly corresponding multicast data flow is transmitted to the user who adds this group.
According to the intelligent transmitting method of the described multicast message of claim 1, it is characterized in that 2, described method also comprises:
D, when router receives the IGMP that is not the static multicast groups used always when joining message for the first time, need utilize agreement independent multicast route PIM agreement to set up multicast forwarding path step by step from source address to this router.
3, according to the intelligent transmitting method of the described multicast message of claim 1, it is characterized in that, refresh the current static multicast groups of using always on the router of intelligent IGMP static host that disposes within a certain period of time.
4, a kind of intelligent transmitting method of multicast message is characterized in that, comprises step:
A, the flow by router port on the monitor network and/or multicast group joining day are determined static multicast groups commonly used in the current system;
B, have in configuration of routers on the interface of intelligent IGMP static host and initiatively add described static multicast groups commonly used, and begin to receive the multicast data flow of described static multicast groups commonly used;
C, when the IGMP that receives static multicast groups commonly used when router joins message, directly corresponding multicast data flow is transmitted to the user who adds this group.
According to the intelligent transmitting method of the described multicast message of claim 4, it is characterized in that 5, described static multicast groups commonly used comprises: the static multicast groups of port flow maximum and/or the longest static multicast groups of joining day.
6, according to the intelligent transmitting method of the described multicast message of claim 4, it is characterized in that, by reading the flow counting of each port of router, add up the flow of each multicast group in a period of time, and the multicast group of flow maximum in this section period is defined as current static multicast groups commonly used.
According to the intelligent transmitting method of the described multicast message of claim 4, it is characterized in that 7, each multicast group accumulative total joining day in statistics a period of time determines that the longest multicast group of accumulative total joining day is static multicast groups commonly used.
According to the intelligent transmitting method of the described multicast message of claim 4, it is characterized in that 8, described method also comprises:
D, when router receives the IGMP that is not the static multicast groups used always when joining message for the first time, need utilize agreement independent multicast route PIM agreement to set up multicast forwarding path step by step from source address to this router.
9, according to the intelligent transmitting method of the described multicast message of claim 4, it is characterized in that, refresh the current static multicast groups of using always on the router of intelligent IGMP static host that disposes within a certain period of time.
10, a kind of intelligent repeater system of multicast message comprises:
Local router is used to receive and transmit the multicast data flow that receives according to the static multicast groups that adding is used always;
It is characterized in that described system also comprises:
Intelligent Web igmpinternet IGMP static host, be configured on the interface of local router, be used for initiatively adding this system static multicast groups commonly used, and receiving the multicast data flow of described static multicast groups commonly used, described static multicast groups commonly used is to determine by the situation that flux of multicast on the monitor network and IGMP join message.
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CN100450068C (en) * 2006-07-18 2009-01-07 杭州华三通信技术有限公司 Multicast group maintaining method
CN102694666B (en) * 2006-08-15 2015-01-28 华为技术有限公司 Multicast service processing method and device
CN100411343C (en) * 2006-08-23 2008-08-13 杭州华三通信技术有限公司 Multicast method and system with static group self-learning capability
WO2009067875A1 (en) * 2007-11-01 2009-06-04 Huawei Technologies Co., Ltd. A multicasting method, system and device
CN101150524B (en) * 2007-11-12 2010-06-09 杭州华三通信技术有限公司 Multicast traffic recovery method and access device
WO2011127857A2 (en) * 2011-05-17 2011-10-20 华为技术有限公司 Processing method for multicast data streams, user facing provider edge (upe) and network facing provider edge (npe)
CN103957165B (en) * 2014-05-16 2017-02-08 国家电网公司 Multicast message management method based on GMRP multicast strategy 'fixing'

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