CN101964733A - Method and system for implementing internet group management protocol snooping and modem - Google Patents
Method and system for implementing internet group management protocol snooping and modem Download PDFInfo
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- CN101964733A CN101964733A CN2010105070591A CN201010507059A CN101964733A CN 101964733 A CN101964733 A CN 101964733A CN 2010105070591 A CN2010105070591 A CN 2010105070591A CN 201010507059 A CN201010507059 A CN 201010507059A CN 101964733 A CN101964733 A CN 101964733A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/18—Protocol analysers
Abstract
The invention discloses a method and a system for implementing internet group management protocol snooping and a modem. The method for implementing the internet group management protocol snooping comprises the following steps that: the modem receives a leave message from local area network equipment, queries a multicast table, saves the leave message when querying that multicast in the multicast table has a plurality of entries, transmits a query message to the local area network equipment and transmits the leave message to uplink equipment under the condition of not receiving response of the local area network equipment. Through the method and the system, black screen caused when the local area network equipment cannot receive a certain channel can be prevented.
Description
Technical field
The present invention relates to the communications field, in particular to the implementation method of a kind of internet group management protocol listening (Internet Group Management Protocol Snooping abbreviates IGMPSnooping as) and system, modulator-demodulator.
Background technology
The IGMP Snooping of at present general Modem (modulator-demodulator) is by intercepting local area network (LAN) (Local Area Network, abbreviate LAN as) side user and (Wide Area Network, abbreviating WAN as) the IGMP message of WAN mouth first line of a couplet communication between devices safeguards the transmitting of corresponding relation of a multicast address and each port of LAN side, after receiving multicast packet, search that this table decides should according to multicast address to which LAN mouth forwarding multicasting bag, as follows to the main flow process of IGMPv2 message:
When receiving pc (computer) from certain LAN port, during IGMP report (response) message that stb (set-top box) etc. sends, (with multicast address, the LAN port, source mac) searches multicast mac table and whether had this forwarding entry, if exist then upgrade ageing time, if there is no then by multicast address, receive the LAN port numbers of this report message, send the equipment sources mac of this report bag, ageing times etc. are created corresponding forwarding entry, add in the multicast mac table, and transmit this message to the WAN mouth; When certain LAN port is received IGMP leave message (leave message), then same (with multicast address, the LAN port, source mac) searches multicast mac table and whether had this forwarding entry, there are then these clauses and subclauses of deletion from multicast mac table, and only search the clauses and subclauses of whether also depositing other with multicast address, if exist explanation to also have other LAN mouth to need this multicast, then the IGMPleave bag is lost no longer and transmitted to the WAN mouth, if there is no other clauses and subclauses of this multicast are then transmitted IGMP leave message to the WAN mouth; After receiving the IGMPquery message that gets off from the WAN mouth, directly transmit to all LAN mouths; In addition when the ageing time of certain clauses and subclauses is decremented to 0, with this clauses and subclauses deletion.
From the basic process of top IGMP snooping as can be seen, if in multicast mac table, exist two clauses and subclauses of same multicast A, when just the LAN side has two ports to add identical multicast group A, have only when last port leaves this multicast group, modem could transmit IGMP leave message to the WAN mouth.When if first port leaves, modem just transmits IGMP leave message to the WAN mouth, can cause first line of a couplet equipment to stop to send to the WAN of modem mouth the message of corresponding multicast A, another one also needs the port of this multicast also can't receive the message of multicast A so; It can also be seen that in addition, can be received by the equipment of other LAN mouths from the IGMP report message that any one LAN makes a slip of the tongue, modem itself does not initiatively send IGMP query message, just gives all LAN mouths the query message transmission of receiving from the WAN mouth.
In actual applications, the inventor finds that some set-top box in the correlation technique has following characteristics to the processing mode of multicast, be exemplified below: typical networking mode such as Fig. 1, set-top box A and B add multicast 239.1.1.1, during transmitting, multicast mac has two clauses and subclauses of a and b, first line of a couplet equipment is at transmission IGMP query message regularly, just sent out the query message at first line of a couplet equipment sometime, modem transmits the query message at all LAN mouths, set-top box A and B have received the query bag, set-top box A has returned the report message earlier, modem is after receiving the report message that A returns, (it all is to have hardware to realize that in most cases this multicast message is transmitted to LAN at LAN in the forwarding of LAN mouth in meeting, do not need through protocol stack), B is after receiving the report message that A returns, just no longer return the report message, that is to say for first line of a couplet equipment and give next query message, the LAN side of modem only has a set-top box and responds the report message, if set-top box B after having received the report message that A returns in the regular hour scope switching channels to 239.1.1.2, set-top box B only can send the report message that will add 239.1.1.2, can not send the leave message that leaves 239.1.1.1, modem can not delete corresponding multicast forwarding clauses and subclauses b yet, but can create a new clauses and subclauses c, the multicast forwarding situation as shown in Figure 2 behind the above-mentioned set-top box B switching channels.
First line of a couplet equipment issues two multicast data flow 239.1.1.1 and 239.1.1.2, set-top box A sees program 239.1.1.1, set-top box B sees program 239.1.1.2, at this time suppose set-top box A again switching channels to 239.1.1.3, set-top box A at first sends a leave message that leaves 239.1.1.1, send a report message that adds 239.1.1.3 then, modem receives leave bag back deletion clauses and subclauses a, because also there is the clauses and subclauses b of 239.1.1.1, so modem can not wrap in the WAN mouth to leave and forward, modem also can set up clauses and subclauses d according to the report message that A sends, first line of a couplet equipment is owing to never receive the leave message that leaves 239.1.1.1, must down send the multicast data flow of 239.1.1.1, behind the A switching channels as shown in Figure 3, first line of a couplet equipment sends three multicast data flow 239.1.1.1 downwards, 239.1.1.2,239.1.1.3, clearly 239.1.1.1 is unnecessary, just caused the waste of bandwidth, if more serious first line of a couplet equipment is to two of multicast data flow restrictions, because two multicast data flows of 239.1.1.1 and 239.1.1.2 have been arranged, the 239.1.1.3 of Jia Ruing just can't down send afterwards, set-top box A since can not receive 239.1.1.3 will blank screen, though the time of blank screen can not surpass the intermittent time that first line of a couplet equipment sends the query bag, this still is to be reluctant to see to the user.In addition, when pc or set-top box abnormal shutdown, power down, dial under the situation of netting twine, the leave message can be do not sent out, all above fault might be occurred.
The problem of blank screen often occurs at lan device in the correlation technique, do not propose effective solution at present as yet because not receiving certain channel.
Summary of the invention
Often the problem of blank screen do not occur and propose the present invention at lan device because receiving certain channel, for this reason, main purpose of the present invention is to provide a kind of implementation method of internet group management protocol listening and system, modulator-demodulator, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of implementation method of internet group management protocol listening.
Implementation method according to internet group management protocol listening of the present invention comprises: modulator-demodulator receives the leave message from lan device; Modulator-demodulator inquiry multicast table; The multicast of modulator-demodulator in inquiring multicast table has under the situation of a plurality of clauses and subclauses, preserves leave message; Modulator-demodulator sends query message to lan device; And modulator-demodulator is sent to first line of a couplet equipment with leave message under situation about not receiving from the response of lan device.
To achieve these goals, according to a further aspect in the invention, provide a kind of realization system of internet group management protocol listening.This system comprises first line of a couplet equipment, modulator-demodulator and lan device, and wherein: lan device is used to send leave message; Modulator-demodulator, be used to receive leave message, the inquiry multicast table, multicast in inquiring multicast table has under the situation of a plurality of clauses and subclauses, preserve leave message, and send query message, and under situation about not receiving, leave message is sent to first line of a couplet equipment from the response of lan device to lan device; First line of a couplet equipment is used to receive leave message.
To achieve these goals, according to a further aspect in the invention, provide a kind of modulator-demodulator.This modulator-demodulator comprises: receiver module is used to receive the leave message from lan device; Enquiry module is used to inquire about multicast table; Preserve module, be used for having under the situation of a plurality of clauses and subclauses, preserve leave message at the multicast that inquires multicast table; First sending module is used for sending query message to lan device; And second sending module is used under situation about not receiving from the response of lan device leave message being sent to first line of a couplet equipment.
By the present invention, adopt the leave message of modulator-demodulator reception from lan device, the inquiry multicast table, multicast in inquiring multicast table has under the situation of a plurality of clauses and subclauses, preserve leave message, send query message to lan device, and under situation about not receiving from the response of lan device, leave message is sent to first line of a couplet equipment, solved lan device and the problem of blank screen often occurred, and then reached and prevent that the effect of blank screen from appearring in lan device because not receiving certain channel because not receiving certain channel.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that adds multicast 239.1.1.1 according to the set-top box A of correlation technique and B;
Fig. 2 is the schematic diagram after the set-top box B according to correlation technique switches to 239.1.1.2
Fig. 3 is the schematic diagram after the set-top box A according to correlation technique switches to 239.1.1.3;
Fig. 4 is the schematic diagram according to the realization system of the internet group management protocol listening of the embodiment of the invention;
Fig. 5 is the flow chart according to the implementation method of the internet group management protocol listening of the embodiment of the invention;
Fig. 6 is the schematic diagram after the set-top box A according to the embodiment of the invention switches to 239.1.1.3;
Fig. 7 is the schematic diagram according to the modulator-demodulator of the embodiment of the invention;
Fig. 8 is the schematic diagram according to the preferred embodiment of modulator-demodulator of the present invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 4 is the schematic diagram according to the realization system of the internet group management protocol listening of the embodiment of the invention.
As shown in Figure 4, the realization system of this internet group management protocol listening comprises first line of a couplet equipment 10, modulator-demodulator 20 and lan device 30.
Wherein, lan device 30 is used to send leave message; Modulator-demodulator 20 is used to receive leave message, the inquiry multicast table, multicast in inquiring multicast table has under the situation of a plurality of clauses and subclauses, preserve leave message, and to lan device transmission query message, and under situation about not receiving, leave message being sent to first line of a couplet equipment from the response of lan device, first line of a couplet equipment 10 is used to receive leave message.
Above-mentioned lan device comprises set-top box and computer.
Fig. 5 is the flow chart according to the implementation method of the internet group management protocol listening of the embodiment of the invention.As shown in the figure, this method comprises:
Step S502, modulator-demodulator receives the leave message from lan device.
For example, modulator-demodulator is via the leave message of LAN port reception from lan device.
Step S504, modulator-demodulator inquiry multicast table.
For example, modulator-demodulator is checked multicast mac table according to the multicast address among the leave after receiving the leave message of certain port.
Step S506, the modulator-demodulator multicast in inquiring multicast table has under the situation of a plurality of clauses and subclauses, preserves leave message.
For example, modulator-demodulator can be preserved leave message in the following ways:
At first, modulator-demodulator is created chained list; And
Modulator-demodulator utilizes chained list that leave message is preserved.
Step S508, modulator-demodulator sends query message to lan device.And
Step S510, modulator-demodulator is sent to first line of a couplet equipment with leave message under situation about not receiving from the response of lan device.
Send specific multicast inquiry message if this multicast has a plurality of clauses and subclauses to the LAN of correspondence port (lan device), start timer, and with the leave packet buffer of receiving; Otherwise the leave message is transmitted at the WAN mouth.
Timer time overtime (timeou) before, if there is the LAN mouth to answer the query message of this multicast, then directly with the leave packet loss of buffer memory; Otherwise then delete all clauses and subclauses of this multicast, and the leave message of buffer memory is transmitted at the WAN mouth.
Scene as described in Figure 6, when set-top box A when 239.1.1.1 switches to 239.1.1.3, modem receives the leave message of 239.1.1.1, begin to inquire about multicast mac table, find that this multicast has a and two clauses and subclauses of b to exist, then the leave packet buffer is got up, send the query message of 239.1.1.1 to the LAN mouth, owing at this time do not had set-top box seeing this program, certainly modem can not receive any response, then a and b are deleted, and transmit the leave bag of previous buffer memory to the WAN mouth, first line of a couplet equipment just can be in the multicast data flow of transmission 239.1.1.1 downwards after receiving this leave message like this, has so just solved in read fortune during with the multicast program, the set-top box of leaving is not previously for a certain reason sent out leave bag and the blank screen that causes, the bandwidth waste problem.
The present invention just just can allow modem initiatively send out query bag in read fortune with program the time in set-top box, to almost not influence of systematic function.
The present invention can solve in some set-top box of protection on the modem and not send the problem that the leave message is brought when playing same multicast group under specific situation by above method.
Preferably, said method also comprises: modulator-demodulator is created marking variable; Wherein, receive from the response of lan device and be under the genuine situation at marking variable at modulator-demodulator, modulator-demodulator is with knot removal corresponding in the chained list.
Said method can also comprise: modulator-demodulator judges whether chained list is empty; And under chained list was empty situation, the modulator-demodulator marking variable was set to vacation.
After modulator-demodulator was sent to first line of a couplet equipment with leave message, said method can also comprise: modulator-demodulator is with knot removal corresponding with leave message in the chained list.
In the above-described embodiments, modulator-demodulator picks up counting after lan device sends query message, and wherein, modulator-demodulator is sent to first line of a couplet equipment with leave message under the very first time does not receive situation from the response of lan device.
Particularly, said method can may further comprise the steps:
Step 1, variable Cquery of query packet buffer that first line of a couplet equipment is sent at first, like this at needs when the LAN mouth is sent out ad hoc inquiry query message, only the query of buffer memory need be guaranteed the repair free of charge and change that purpose multicast address and CRC check get final product, not need to construct from the beginning to the end a query message.
Step 2, create a chained list, a timer and a marking variable, whenever the leave message of receiving a LAN side, inquiry multicast mac table, if inquire this multicast a plurality of clauses and subclauses are arranged, then send specific multicast query message, and create a chained list node, be used for timeout time and the corresponding multicast address of buffer memory leave message and query to the LAN mouth.
Step 3, as long as in the chained list node is arranged, the value of marking variable is made as true (very), timer all can start, and timer time is to then traveling through chained list, and timeout time of each node is subtracted 1, and judge whether timeout has been 0, if be 0 then the leave message preserved in the node transmitted at the WAN mouth, delete this node, timer is retimed.
Step 4 is received the report message from the LAN port, if marking variable is true, then according to multicast address traversal chained list, find just knot removal, and judge whether chained list has been sky, if be empty, marking variable is set to false (vacation), timeing closing device.
As can be seen from the above description, the present invention can prevent that lan device from blank screen not occurring because receiving certain channel.
Need to prove, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
Fig. 7 is the schematic diagram according to the modulator-demodulator of the embodiment of the invention.As shown in the figure, this modulator-demodulator comprises receiver module 802, enquiry module 804, preserves module 806, first sending module 808 and second sending module 810.
Wherein, receiver module 802 is used to receive the leave message from lan device; Enquiry module 804 is used to inquire about multicast table; Preserve module 806, be used for having under the situation of a plurality of clauses and subclauses, preserve leave message at the multicast that inquires multicast table; First sending module 808 is used for sending query message to lan device; And second sending module 810, be used under situation about not receiving, leave message being sent to first line of a couplet equipment from the response of lan device.
Fig. 8 is the schematic diagram according to the preferred embodiment of modulator-demodulator of the present invention.
Compare with the above embodiments, the modulator-demodulator of present embodiment also comprises: creation module 812, be used to create chained list, and wherein, chained list is used for leave message is preserved; And removing module 814, be used under situation about receiving, with knot removal corresponding in the chained list from the response of lan device.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, 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 implementation method of an internet group management protocol listening is characterized in that, comprising:
Modulator-demodulator receives the leave message from lan device;
Described modulator-demodulator inquiry multicast table;
The multicast of described modulator-demodulator in inquiring described multicast table has under the situation of a plurality of clauses and subclauses, preserves described leave message;
Described modulator-demodulator sends query message to described lan device; And
Described modulator-demodulator is sent to first line of a couplet equipment with described leave message under situation about not receiving from the response of described lan device.
2. method according to claim 1 is characterized in that, described modulator-demodulator is preserved described leave message and comprised:
Described modulator-demodulator is created chained list; And
Described modulator-demodulator utilizes described chained list that described leave message is preserved.
3. method according to claim 2 is characterized in that, described method also comprises:
Described modulator-demodulator is created marking variable;
Wherein, receive from the response of described lan device and be under the genuine situation at described marking variable at described modulator-demodulator, described modulator-demodulator is with knot removal corresponding in the described chained list.
4. method according to claim 3 is characterized in that, described method also comprises:
Described modulator-demodulator judges whether described chained list is empty; And
At described chained list is that the described marking variable of described modulator-demodulator is set to vacation under the situation of sky.
5. method according to claim 2 is characterized in that, after described modulator-demodulator was sent to described first line of a couplet equipment with described leave message, described method also comprised:
Described modulator-demodulator is with knot removal corresponding with described leave message in the described chained list.
6. method according to claim 1, it is characterized in that, described modulator-demodulator is after lan device sends query message, pick up counting, wherein, described modulator-demodulator is sent to described first line of a couplet equipment with described leave message under the very first time does not receive situation from the response of described lan device.
7. a modulator-demodulator is characterized in that, comprising:
Receiver module is used to receive the leave message from lan device;
Enquiry module is used to inquire about multicast table;
Preserve module, be used for having under the situation of a plurality of clauses and subclauses, preserve described leave message at the multicast that inquires described multicast table;
First sending module is used for sending query message to described lan device; And
Second sending module is used under situation about not receiving from the response of described lan device described leave message being sent to first line of a couplet equipment.
8. modulator-demodulator according to claim 7 is characterized in that, also comprises:
Creation module is used to create chained list, and wherein, described chained list is used for described leave message is preserved; And
Removing module is used under situation about receiving from the response of described lan device, with knot removal corresponding in the described chained list.
9. the realization system of an internet group management protocol listening is characterized in that, comprises first line of a couplet equipment, modulator-demodulator and lan device, wherein:
Described lan device is used to send leave message;
Described modulator-demodulator, be used to receive described leave message, the inquiry multicast table, multicast in inquiring described multicast table has under the situation of a plurality of clauses and subclauses, preserve described leave message, and send query message, and under situation about not receiving, described leave message is sent to described first line of a couplet equipment from the response of described lan device to lan device;
Described first line of a couplet equipment is used to receive described leave message.
10. system according to claim 9 is characterized in that described lan device comprises set-top box and computer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010507059.1A CN101964733B (en) | 2010-09-27 | 2010-09-27 | Method and system for implementing internet group management protocol snooping and modem |
| PCT/CN2011/076741 WO2012041104A1 (en) | 2010-09-27 | 2011-06-30 | Method, system and modem for implementing internet group management protocol snooping |
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| CN201010507059.1A CN101964733B (en) | 2010-09-27 | 2010-09-27 | Method and system for implementing internet group management protocol snooping and modem |
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| CN101964733A true CN101964733A (en) | 2011-02-02 |
| CN101964733B CN101964733B (en) | 2015-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012041104A1 (en) * | 2010-09-27 | 2012-04-05 | 中兴通讯股份有限公司 | Method, system and modem for implementing internet group management protocol snooping |
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| US6977891B1 (en) * | 2001-06-30 | 2005-12-20 | Extreme Networks, Inc. | Method and system for multicast traffic reduction |
| CN1731756A (en) * | 2004-08-05 | 2006-02-08 | 上海贝尔阿尔卡特股份有限公司 | Method and device for processing user to leave, switching multicast service channel request using slow leaving mechanism |
| CN1878121A (en) * | 2006-07-18 | 2006-12-13 | 杭州华为三康技术有限公司 | Multicast group maintaining method |
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| US20050125420A1 (en) * | 2003-12-03 | 2005-06-09 | Allen Tsz-Chiu Wong | System and method of operating the system that prevents multiple channels from continuously being sent to the same set top box |
| CN101145922B (en) * | 2006-09-13 | 2011-06-22 | 中兴通讯股份有限公司 | A system and method for realizing reliable exit of multi-cast terminal |
| CN101964733B (en) * | 2010-09-27 | 2015-01-28 | 中兴通讯股份有限公司 | Method and system for implementing internet group management protocol snooping and modem |
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| US6977891B1 (en) * | 2001-06-30 | 2005-12-20 | Extreme Networks, Inc. | Method and system for multicast traffic reduction |
| CN1731756A (en) * | 2004-08-05 | 2006-02-08 | 上海贝尔阿尔卡特股份有限公司 | Method and device for processing user to leave, switching multicast service channel request using slow leaving mechanism |
| CN101094132A (en) * | 2006-06-20 | 2007-12-26 | 中兴通讯股份有限公司 | Process method for restarting terminal device of multicast service |
| CN1878121A (en) * | 2006-07-18 | 2006-12-13 | 杭州华为三康技术有限公司 | Multicast group maintaining method |
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| WO2012041104A1 (en) * | 2010-09-27 | 2012-04-05 | 中兴通讯股份有限公司 | Method, system and modem for implementing internet group management protocol snooping |
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| WO2012041104A1 (en) | 2012-04-05 |
| CN101964733B (en) | 2015-01-28 |
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