CN100563213C - The implementation method that IGMP is intercepted, system and device - Google Patents

The implementation method that IGMP is intercepted, system and device Download PDF

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Publication number
CN100563213C
CN100563213C CNB2006101683877A CN200610168387A CN100563213C CN 100563213 C CN100563213 C CN 100563213C CN B2006101683877 A CNB2006101683877 A CN B2006101683877A CN 200610168387 A CN200610168387 A CN 200610168387A CN 100563213 C CN100563213 C CN 100563213C
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multicast
vlan tag
message
group
access device
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CN1996957A (en
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王黎阳
赵凤华
周鹏
刘学勤
凌义
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2007/070678 priority patent/WO2008077321A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership

Abstract

The invention provides the method that IGMP is intercepted, the user side access device is safeguarded the corresponding relation of multicast message distribution in this method, also comprises: A, user side access device receive the multicast message that carries multicast identifier and public network label (P-VLAN Tag); B, user side access device are searched the subscriber equipment of corresponding user network label (C-VLAN Tag) sign according to P-VLAN Tag and multicast identifier in the multicast message at described corresponding relation; After C, user side access device replace to the C-VLAN Tag that finds with the P-VLANTag in the multicast message, send to the subscriber equipment of C-VLAN Tag sign.The system that the present invention also provides a kind of IGMP to intercept, this system comprises network equipment, user side access device and subscriber equipment.The device that the present invention also provides a kind of IGMP to intercept.

Description

The implementation method that IGMP is intercepted, system and device
Technical field
The present invention relates to the message transmissions technology in the Internet, particularly IGMP is intercepted implementation method, system and the device of (IGMP Snooping).
Background technology
Continuous development along with the Internet, data mutual in the network are more and more, and ecommerce, Web TV new services such as (IPTV) are also risen gradually, and these variations have all proposed new requirement to the network bandwidth, traditional point-to-point transmission method of message can not satisfy new requirement.Occurred can realizing a little arriving the multicasting technology of multiple spot high efficiency of transmission in this case, a large amount of conserve network bandwidth reduce offered load, and some new value-added services are provided simultaneously very easily.
But, when using multicasting technology, multicast router sends to multicast message after the user side access device, the user side access device message need be copied as with switch under the number of member's similar number, transmit to each switch then, so just message having been sent to some does not need the switch of multicast message, can not realize transmitting as required.IGMP Snooping technology has solved this problem, network equipment sends the member relation query message according to the polling cycle of setting to switch, if network equipment listens to the member relation query message feedback that switch sends in the polling cycle of setting, it is member's relational query report, then think and comprise multicast member under the switch, if network equipment does not listen to the member relation query report that switch sends in the polling cycle of setting, just think and do not comprise multicast member under the switch, just can know the recipient that multicast message is arranged under which switch in this way, only comprise that multicast message recipient's switch can receive multicast message.Fig. 1 shows IGMP Snooping The Application of Technology scene, and the solid line among the figure is connected to link, and dotted arrow is that multicast message flows to.As shown in Figure 1, two multicast members are arranged under first switch, customer access equipment is transferred to first switch with multicast message, be transferred to two multicast members by first switch again, owing to do not have multicast member under second switch, so second switch does not obtain the multicast message that sends, realize transmission as required.
The QinQ agreement is the tunnel protocol based on 802.1Q, and the main purpose of proposition is in order to solve increasing Virtual Local Area Network quantity problem, to reduce the VLAN on the service provider network.The core concept of QinQ agreement is, distribute a public network VLAN (ProviderVLAN for each group user, P-VLAN), when the user's message in this group enters service provider backbone network, except stamp user network label (C-VLAN Tag) for each user's message, stamp newly assigned public network label (P-VLAN Tag) for each user's message again, that is to say that the user's message band the backbone network that two-layer label passes through the service provider, the method for this encapsulation can be called the QinQ encapsulation.When user's message arrives the equipment of backbone network opposite side, peel off P-VLAN Tag, send subscriber equipment again to after restoring user's message.Fig. 2 shows message based on the transmission schematic diagram in the network of QinQ agreement, is called the QinQ network based on the network of QinQ agreement.As shown in Figure 2, message by service provider backbone network 202, is transferred to second user network 203 from first user network 201.In transmission course, message is only used one deck C-VLAN Tag when first user network 201, and during by service provider backbone network 202, message has been stamped second layer P-VLAN Tag, and when arriving second user network 203, message is peeled off P-VLAN Tag.
At present, multicasting technology is applied to the QinQ network becomes a new problem, and by QinQ network service, the user side access device is connecting the user network of different VLAN between multicast router and user side access device.In order in the QinQ network, effectively to support multicasting technology the IGMPSnooping technology also to be applied to the QinQ network.Relatively Chang Yong a kind of technology is exactly to realize IGMP Snooping technology on multicast router, confirm that by the member relation query report of intercepting the switch transmission switch among which C-VLAN needs the receiving group message, multicast router receives after the multicast message, take QinQ to encapsulate and send many parts of multicast messages to the user side access device, the multicast message number that sends need to equal the number of all switches among the C-VLAN of receiving group message, access device receives peeling outer layer P-VLAN after the multicast message, multicast message is transmitted to all switches among the C-VLAN that needs multicast message according to internal layer C-VLAN.
The above-mentioned mode of in the QinQ network, using multicasting technology and IGMP Snooping technology, though realized in the QinQ network, distributing as required multicast message, but distribution is based on the C-VLAN realization as required, when two switches are positioned at same C-VLAN and have only a switch to need multicast message, then another does not need the switch of multicast message can receive multicast message yet in this manner, cause the waste of Customer Premises Network bandwidth, make multicast message in the QinQ network, need to duplicate many parts simultaneously, offered load increases the weight of, when the C-VLAN number was a lot, flow congestion and packet loss appearred easily.
Summary of the invention
The embodiment of the invention provides the implementation method of IGMP Snooping, and this method can effectively be used the network bandwidth in the QinQ network, avoid flow congestion, and the realization multicast message is distributed as required.
The embodiment of the invention provides the realization system of IGMP Snooping, and this system can effectively use the network bandwidth in the QinQ network, avoid flow congestion, and the realization multicast message is distributed as required.
The embodiment of the invention provides the implement device of IGMP Snooping, and this device can effectively use the network bandwidth in the QinQ network, avoid flow congestion, and the realization multicast message is distributed as required.
The implementation method of the IGMP Snooping that the embodiment of the invention provides, the user side access device is safeguarded and is comprised public network label P-VLAN Tag in this method, the corresponding relation of the subscriber equipment of the group of multicast identifier and user network label C-VLANTag sign, be specially: the multicast group that the user side access device receives the subscriber equipment transmission joins message, according to C-VLAN Tag and the multicast identifier in the message, in described corresponding relation, find the corresponding group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that group that increase finds and transmission multicast group join message, if in described corresponding relation, do not find the corresponding P-VLAN Tag that comprises, the group of multicast identifier, the user side access device sends described multicast group to network equipment and joins message, after network equipment was made response, the increase of described user side access device comprised P-VLAN Tag, the group of this multicast identifier reaches the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that joins message with this multicast group of transmission; This method also comprises:
A, user side access device receive the multicast message that carries P-VLAN Tag and multicast identifier that network equipment sends;
B, user side access device are searched the subscriber equipment of corresponding C-VLAN Tag sign according to P-VLAN Tag and multicast identifier in the multicast message according to described corresponding relation;
After C, user side access device replace to the C-VLANTag that finds with the P-VLAN Tag in the multicast message, send to the subscriber equipment of C-VLAN Tag sign.
The realization system of the IGMP Snooping that the embodiment of the invention provides, this system comprises: network equipment, user side access device and subscriber equipment;
Described network equipment will carry the multicast message of P-VLAN Tag and multicast identifier, send to the user side access device by the QinQ network;
Described user side access device, be used for service equipment and comprise P-VLAN Tag, the corresponding relation of the subscriber equipment of the group of multicast identifier and C-VLAN Tag sign, being specially the multicast group that receives the subscriber equipment transmission joins message, according to C-VLAN Tag and the multicast identifier in the message, in described corresponding relation, find the corresponding group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that group that increase finds and transmission multicast group join message, if in described corresponding relation, do not find the corresponding P-VLAN Tag that comprises, the group of multicast identifier, sending described multicast group to network equipment joins message, after network equipment was made response, increase comprised P-VLAN Tag, the group of this multicast identifier reaches the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that joins message with this multicast group of transmission; P-VLAN Tag and multicast identifier that the multicast message that sends according to network equipment carries, search the subscriber equipment that the C-VLAN Tag sign of corresponding relation is arranged with the group that comprises P-VLAN Tag, multicast identifier according to described corresponding relation, after P-VLAN Tag in the multicast message replaced to the C-VLAN Tag that finds, send to the subscriber equipment of C-VLAN Tag sign;
Described subscriber equipment is used to receive the multicast message that the user side access device sends.
The implement device of the IGMP Snooping that the embodiment of the invention provides, maintenance comprises P-VLAN Tag, the corresponding relation of the subscriber equipment of the group of multicast identifier and C-VLAN Tag sign, be specially: the multicast group that receives the subscriber equipment transmission joins message, according to C-VLAN Tag and the multicast identifier in the message, in described corresponding relation, find the corresponding group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that group that increase finds and transmission multicast group join message, if in described corresponding relation, do not find the corresponding P-VLAN Tag that comprises, the group of multicast identifier, sending described multicast group to network equipment joins message, after network equipment was made response, increase comprised P-VLAN Tag, the group of this multicast identifier reaches the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that joins message with this multicast group of transmission; This device comprises transceiver module, parsing module and memory module;
Described transceiver module is used to receive the multicast message that carries P-VLAN Tag and multicast identifier that network equipment sends, and is transferred to parsing module; According to the lookup result of parsing module, the P-VLAN Tag of multicast message replaced with C-VLAN Tag after, send to the subscriber equipment of C-VLAN Tag sign;
Described parsing module, be used to receive the multicast message of transceiver module transmission, according to P-VLAN Tag and the multicast identifier in the multicast message, in the memory module stored relation, search the corresponding relation of the subscriber equipment of the group that comprises this P-VLANTag, multicast identifier and C-VLAN Tag sign, obtain sending to transceiver module behind the lookup result;
Described memory module is used to store the corresponding relation of the subscriber equipment of the group that comprises P-VLAN Tag, multicast identifier and C-VLAN Tag sign.
As seen from the above technical solution, the method of the IGMP Snooping that the embodiment of the invention provides, maintenance comprises the group of P-VLAN Tag, multicast identifier and the corresponding relation of the subscriber equipment that C-VLAN Tag identifies on the user side access device, the multicast message that network equipment will carry P-VLAN Tag and multicast identifier sends to the user side access device, the user side access device is searched the subscriber equipment that receives this multicast message from the corresponding relation of safeguarding, re-use to send to subscriber equipment after the C-VLAN Tag that finds replaces P-VLANTag in the multicast message.By said method, only multicast message is sent to the subscriber equipment that needs the receiving group message, effectively use the network bandwidth, avoid flow congestion, realized that multicast message distributes as required.
The system of the IGMP Snooping that the embodiment of the invention provides, network equipment in the system is used for and will carries the multicast message of P-VLAN Tag and multicast identifier, send to the user side access device by the QinQ network, the user side access device is used for maintenance and comprises P-VLAN Tag, the corresponding relation of the subscriber equipment of the group of multicast identifier and C-VLAN Tag sign, after receiving multicast message, search the subscriber equipment that receives this multicast message from the corresponding relation of safeguarding, the C-VLAN Tag that re-uses the subscriber equipment that finds sends to this subscriber equipment after replacing P-VLAN Tag in the multicast message.Utilize said system, only multicast message is sent to the subscriber equipment that needs the receiving group message, effectively use the network bandwidth, avoid flow congestion, realized that multicast message distributes as required.
The device of the IGMP Snooping that the embodiment of the invention provides, the transceiver module in this device is used to receive the multicast message that carries P-VLAN Tag and multicast identifier that the user side access device sends, and is transferred to parsing module; According to the lookup result of parsing module, the P-VLAN Tag of multicast message is replaced with the subscriber equipment that sends to C-VLAN Tag sign behind the C-VLAN Tag.Parsing module in the equipment, be used to receive the multicast message of transceiver module transmission, according to P-VLAN Tag and the multicast identifier in the multicast message, in the memory module stored relation, search the corresponding relation of the subscriber equipment of the group that comprises this P-VLAN Tag, multicast identifier and C-VLAN Tag sign.Memory module in the equipment is used to store the corresponding relation of the subscriber equipment of the group that comprises P-VLAN Tag, multicast identifier and C-VLAN Tag sign.Utilize said apparatus, only multicast message is sent to the subscriber equipment that needs the receiving group message, effectively use the network bandwidth, avoid flow congestion, realized that multicast message distributes as required.
Description of drawings
Fig. 1 is a prior art IGMP Snooping technology application scenarios schematic diagram;
Fig. 2 is a QinQ Network Transmission schematic diagram;
Fig. 3 is the realization system configuration schematic diagram of embodiment of the invention IGMP Snooping;
Fig. 4 is that the multicast that embodiment of the invention user side access device is safeguarded receives the list structure schematic diagram;
Fig. 5 is the implementation method better embodiment flow chart of embodiment of the invention IGMP Snooping;
Fig. 6 safeguards the better embodiment flow chart of multicast reception table for user side access device in the implementation method of embodiment of the invention IGMP Snooping;
Fig. 7 is the flow chart of the implementation method of embodiment of the invention IGMP Snooping based on system shown in Figure 3;
Fig. 8 is the structural representation of the implement device of embodiment of the invention IGMP Snooping.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, the embodiment of the invention is described in further detail below in conjunction with accompanying drawing.
The embodiment of the invention provides the implementation method of IGMP Snooping, the maintenance of user side access device comprises the group of P-VLAN Tag, multicast identifier and the corresponding relation of the subscriber equipment that C-VLAN Tag identifies, at first, the network equipment multicast message that will carry P-VLAN Tag and multicast identifier sends to the user side access device; Secondly, the user side access device is searched the subscriber equipment that forms the C-VLAN Tag sign of corresponding relation with the group that comprises P-VLAN Tag, multicast identifier according to P-VLAN Tag and multicast identifier in the multicast message in the corresponding relation of safeguarding; End user's side joint is gone into after equipment replaces to the C-VLAN Tag that finds with the P-VLAN Tag in the multicast message, the subscriber equipment of the C-VLAN Tag sign that sends to.
The embodiment of the invention provides the realization system of IGMP Snooping, this system comprises network equipment, user side access device and subscriber equipment, the multicast message that the network equipment is used for will carrying by the QinQ network P-VLAN Tag and multicast identifier is transferred to the user side access device, the user side access device is used for maintenance and comprises P-VLAN Tag, the corresponding relation of the subscriber equipment of the group of multicast identifier and C-VLAN Tag sign, from multicast message, obtain P-VLAN Tag and multicast identifier, in the corresponding relation of safeguarding, search the subscriber equipment that the C-VLAN Tag sign of corresponding relation is arranged with the group that comprises P-VLAN Tag and multicast identifier, P-VLAN Tag in the multicast message is replaced to C-VLAN Tag, send to the subscriber equipment of C-VLAN Tag sign.
The embodiment of the invention provides the implement device of IGMP Snooping, and this device comprises transceiver module, parsing module and memory module.Transceiver module is used to receive the multicast message that carries P-VLAN Tag and multicast identifier that network equipment sends, and is transferred to parsing module; According to the lookup result of parsing module, the P-VLAN Tag of multicast message is replaced with the subscriber equipment that sends to C-VLAN Tag sign behind the C-VLAN Tag.Parsing module, be used to receive the multicast message of transceiver module transmission, according to P-VLAN Tag and the multicast identifier in the multicast message, in the memory module stored relation, search the corresponding relation of the subscriber equipment of the group that comprises this P-VLANTag, multicast identifier and C-VLAN Tag sign.Described memory module is used to store the corresponding relation of the subscriber equipment of the group that comprises P-VLAN Tag, multicast identifier and C-VLAN Tag sign.
Implementation method, system and the device of the IGMP Snooping that the embodiment of the invention is provided are described in detail below.
At first, the realization system of the IGMP Snooping that the embodiment of the invention is provided is described in detail.Referring to Fig. 3, Fig. 3 shows the realization system configuration schematic diagram of embodiment of the invention IGMP Snooping, and wherein solid line is connected to the link connection, and dotted arrow is that multicast message flows to.As shown in Figure 3, this system comprises: network equipment 311, user side access device 303 and subscriber equipment 312.Wherein network equipment 311 comprises multicast source 301 and multicast router 302, subscriber equipment 312 comprises first switch 304, second switch 305, the 3rd switch 306 and the 4th switch 307, first switch 304 and second switch 305 are in the 2nd VLAN 308, and the 3rd switch 306 and the 4th switch 307 are in the 3rd VLAN 309.Multicast router 302 is communicated by letter by the VLAN 310 based on the QinQ agreement with user side access device 303, and the label of supposing a VLAN is P-VLAN1, and the label of the 2nd VLAN 308 is that the label of C-VLAN 2, the three VLAN 309 is C-VLAN3.
Multicast source 301, the multicast message that is used for carrying multicast identifier sends to multicast router 302.
Multicast router 302, be connected with user side access device 303, by a VLAN 310 multicast message is sent to user side access device 303, the multicast message encapsulation one deck P-VLAN Tag that carries multicast identifier that is used to multicast source 301 to send sends to user side access device 303 with the multicast message after the encapsulation.When sending multicast message, multicast router 302 stamps one deck P-VALN Tag only for the multicast message that carries multicast identifier, and the multicast message that will carry multicast identifier and P-VALN Tag afterwards sends to user side access device 303.In the embodiment of the invention, multicast router 302 sends multicast messages by a VLAN 310, and then the P-VLAN Tag that stamps to multicast message of multicast router 302 is P-VLAN 1.
User side access device 303 is connected with multicast router 302, first switch 304, second switch 305, the 3rd switch 306 and the 4th switch 307.Enable IGMP Snooping function on the user side access device 303, safeguard that in user side access device 303 multicast receives table, comprise the group of P-VLAN Tag, multicast identifier and the corresponding relation of C-VLAN Tag and outbound port in this multicast reception table, wherein outbound port refers to the outbound port of user side access device 303 and first switch 304, second switch 305, the 3rd switch 306 and the 4th switch 307.Fig. 4 shows the structural representation of the multicast reception table of embodiment of the invention user side access device 303 maintenances, as shown in Figure 4, in the multicast reception table each comprises corresponding one or more forward node of the group of P-VLAN Tag and multicast identifier, comprise in the forward node and need the C-VLAN of receiving group message Tag and outbound port, multicast receives the node pointer in the table, points to first forward node of each group.The number that comprises forward node during the forward node number has identified one group.After multicast message sends to the subscriber equipment of C-VLAN Tag sign of forward node correspondence, node pointer points to next forward node, point to the forward node of a sky up to node pointer, forwarding according to the forward node in this group finishes, and finishes first forward node that this group is returned in the redirect of posterior nodal point pointer.In the embodiment of the invention, suppose the user side access device 303 and first switch 304, second switch 305, the outbound port of the 3rd switch 306 and the 4th switch 307 is respectively PORT1, PORT2, PORT3 and PORT4, multicast identifier under the multicast message is G1, need to suppose first switch 304 for the outbound port PORT1 correspondence among the C-VLAN 2 of receiving group message, and the 4th switch 307 of the outbound port PORT4 correspondence among the C-VLAN 3, because in the embodiment of the invention, 302 of multicast routers are that the VLAN 310 of P-VLAN 1 sends multicast messages to user side access device 303 by label, only use first group in the multicast reception table shown in Figure 4 when therefore transmitting.The multicast message that user side access device 303 sends by a VLAN 310 receiving group router threes 02, obtain P-VLAN 1 and multicast group G1, forward node according in the group of P-VLAN 1 and G1 formation in the multicast reception table sends to first switch 304 and the 4th switch 307 from PORT1 and PORT4 successively with multicast message.
First switch 304, second switch, 305, the three switches 306 and the 4th switch 307 are connected with user side access device 303 respectively, are used to receive the multicast message that user side access device 303 is sent into.
In the realization system of the IGMP Snooping that the embodiment of the invention of foregoing description provides, safeguarding on the user side access device 303 has multicast reception table, and the user side access device can be safeguarded this multicast reception table by dual mode.
First kind of mode, first switch 304, second switch 305, further comprise the message sending module respectively in the 3rd switch 306 and the 4th switch 307, be used for sending messages that institute's literary composition of transmitting messages joins message or the multicast group leave message for multicast group to user side access device 303.May further include a user's message receiver module in the multicast router 302.The message that user side access device 303 sends by the message sending module that receives in each switch is safeguarded the multicast reception table in this equipment.User side access device 303 listens to multicast group that switch sends when joining message, according to the C-VLAN Tag of this message and the multicast identifier of application adding, in multicast reception table, search the group that comprises P-VLANTag and this multicast identifier, in this group, increase the forward node that comprises this switch C-VLAN Tag and outbound port, if user side access device 303 does not find the group that comprises P-VLAN Tag and this multicast identifier in multicast reception table, think that then application adds the switch of the switch of this multicast group for first this multicast group of application adding, user side access device 303 will send this multicast group and join message to the user's message receiver module in the multicast router 302, after user's message receiver module in multicast router 302 is made response to this message, user side access device 303 increases in multicast reception table and comprises P-VLAN Tag, the group of this multicast identifier, and the forward node of the subscriber equipment that the corresponding transmission of increase multicast group joins message in this group; When user side access device 303 listens to the multicast group leave message of switch transmission, C-VLAN Tag and the multicast identifier of applying for leaving according to this message, in multicast reception table, search the group that comprises P-VALN Tag and this multicast identifier, search and in this group, delete the forward node that comprises this switch C-VLAN Tag and outbound port after finishing, if in the group that comprises P-VLAN Tag and this multicast identifier that user side access device 303 finds in multicast reception table, the forward node that has only the subscriber equipment correspondence that sends this multicast group leave message, think that then the switch that sends this multicast group leave message leaves the switch of this multicast group for last application, user side access device 303 at first leaves last application the forward node deletion of the switch correspondence of this multicast group, deletion comprises P-VLAN Tag from multicast reception table again, the group of this multicast identifier, last user's message receiver module in multicast router 302 sends this multicast group leave message, informs that multicast router 302 these multicast group leave.
The second way, may further include enquiry module in the multicast router 302, be used for initiating inquiry, and receive the member relation report that each switch sends by user side access device 303 by the member relation query message that P-VLAN Tag and multicast identifier are carried in transmission.Further comprise the message sending module respectively in first switch 304, second switch, 305, the three switches 306 and the 4th switch 307, be used for sending the member relation query report, as the response of member relation query message to user side access device 303.If in the polling cycle of setting, user side access device 303 is in the polling cycle of setting, receive the member relation query report of the switch transmission of being inquired about, then think by query facility still in affiliated multicast group, forwarding relation about this switch during multicast receives and shows is constant, when the member relation query report that receives has when a plurality of, by suppressing the transmission of these member relation reports, select the report of one or more member relations to send to enquiry module in the multicast router 302, to guarantee the network bandwidth between user side access device 303 and the multicast router 302; If user side access device 303 is in the polling cycle of setting, do not receive the member relation query report of the switch transmission of being inquired about, C-VLAN Tag and outbound port sign according to this switch, in multicast reception table, search the corresponding group that comprises P-VLAN Tag and multicast identifier, in the corresponding forward node of multicast identifier those groups identical, delete the forward node that comprises this switch C-VLAN Tag and outbound port with multicast group under this switch shown in the member relation query report.
In the above-mentioned second kind mode of safeguarding multicast reception table, also can a query facility further be set at network side, be specifically designed to and initiate the member relation inquiry, the member relation query message of carrying P-VLAN Tag is sent to multicast router 302, again by multicast router 302 for member relation query message encapsulation P-VLAN Tag after, the member relation query message of carrying P-VLAN Tag and multicast identifier is sent to user side access device 303.
The realization system of the IGMP Snooping that the invention described above embodiment provides, multicast router 302 is only to multicast message encapsulation P-VLAN Tag, user side access device 303 finds the subscriber equipment that needs the receiving group message by the multicast reception table in this plant maintenance, the C-VLAN Tag of the subscriber equipment that use finds sends to subscriber equipment with multicast message after replacing the P-VLAN Tag of multicast message.In this way, multicast router 302 need not multicast message is copied as the umber identical with subscriber equipment under the C-VLAN, thereby has alleviated the flow load of QinQ network, has saved the network bandwidth, has realized real distribution as required.
Secondly, the implementation method of the IGMP Snooping that the embodiment of the invention is provided is described in detail.The flow chart of the implementation method better embodiment of the IGMP Snooping that Fig. 5 provides for the embodiment of the invention, in this flow process, the maintenance of user side access device comprises the group of P-VLAN Tag, multicast identifier and the corresponding relation of the subscriber equipment that C-VLAN Tag identifies, and this flow process also comprises:
Step 501: the multicast message that network equipment will carry P-VLAN Tag and multicast identifier sends to the user side access device.
In this step, network equipment does not take the QinQ mode to encapsulate multicast message, stamps individual layer P-VLAN Tag only for the multicast message that carries multicast identifier, and the multicast message that carries P-VLAN Tag and multicast identifier is sent to the user side access device.
Step 502: the user side access device is searched the subscriber equipment that the C-VLAN Tag sign of corresponding relation is arranged with the group that comprises P-VLAN Tag, multicast identifier according to the P-VLAN Tag and the multicast identifier that carry in the multicast message in the corresponding relation of safeguarding.
Step 503: after the user side access device replaces to the C-VLAN Tag that finds with the P-VLAN Tag in the multicast message, send to the subscriber equipment of C-VLAN Tag sign.
The better embodiment of the implementation method of the IGMP Snooping that the invention described above embodiment provides, network equipment is only to multicast message encapsulation P-VLAN Tag, the user side access device is by finding the subscriber equipment that needs the receiving group message in the corresponding relation of this plant maintenance, the C-VLAN Tag of the subscriber equipment that use finds sends to subscriber equipment with multicast message after replacing the P-VLAN Tag of multicast message.In this way, network equipment need not multicast message is copied as the umber identical with subscriber equipment under the C-VLAN, thereby has alleviated the flow load of QinQ network, has saved the network bandwidth, has realized real distribution as required.
In this better embodiment, the maintenance of user side access device comprises that the group of P-VLAN Tag, multicast identifier and the method for the subscriber equipment corresponding relation that C-VLAN Tag identifies have two kinds: the firstth, by the message that listen for user equipment sends, safeguard described corresponding relation at different type of messages.The messages sent by user equipment type has two kinds, and promptly multicast group joins message and the multicast group leave message; The secondth, the message that the member relation query message of network equipment being initiated according to subscriber equipment sends, i.e. described corresponding relation is safeguarded in member's relational query report.Fig. 6 comprises the group of P-VLANTag, multicast identifier formation and the method better embodiment flow chart of the subscriber equipment corresponding relation that C-VLAN Tag identifies for the maintenance of user side access device, and this flow process comprises:
Step 601: the user side access device obtains C-VLAN Tag and multicast identifier from messages sent by user equipment, message is that multicast group is when joining message, execution in step 602, when message is the multicast group leave message, execution in step 605, when message is the member relation query report, execution in step 608.
Step 602: the user side access device is according to the multicast identifier of C-VLAN Tag and application adding, in multicast reception table, search the group that comprises P-VLAN Tag and this multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that group that comprises P-VLAN Tag, multicast identifier that increase finds and transmission multicast group join message.
Step 603: send subscriber equipment that multicast group joins message in the determining step 602 and whether be first member in the multicast group that requirement adds, if execution in step 604, if not process ends then.
In this step,, think that then the subscriber equipment of this multicast group of application adding adds the subscriber equipment of this multicast group for first application if the user side access device does not find the group that comprises P-VLAN Tag and this multicast identifier in the corresponding relation of safeguarding.
Step 604: the user side access device sends this multicast group to network equipment and joins message, after network equipment is made response to this message, the user side access device increases the corresponding relation that the group that comprises P-VLAN Tag, this multicast identifier reaches the subscriber equipment of the C-VLAN Tag sign that joins message with this multicast group of transmission in the corresponding relation of safeguarding.
Step 605: the user side access device is according to C-VLAN Tag and the multicast identifier of applying for leaving, in multicast reception table, search the group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign of group that comprises P-VLAN Tag, multicast identifier that deletion finds and transmission multicast group leave message.
Step 606: whether the subscriber equipment that sends the multicast group leave message in the determining step 605 is last member in the multicast group left of requirement, if execution in step 607, if not process ends then.
In this step, if the user side access device is in the corresponding relation of safeguarding, only find the corresponding relation of group that comprises P-VLAN Tag and this multicast identifier and the subscriber equipment that sends this multicast group leave message, think that then the subscriber equipment that sends this multicast group leave message leaves the subscriber equipment of this multicast group for last application.
Step 607: the user side access device is in the corresponding relation of safeguarding, the group that comprises P-VLAN Tag, this multicast identifier that deletion finds reaches the corresponding relation of the subscriber equipment that identifies with the C-VLAN Tag that sends this multicast group leave message, sends this multicast group leave message to network equipment.
Step 608: the user side access device is suppressed the member relation query report that subscriber equipment sends, and selects one or more member relation query report to send the back process ends to network equipment.
Above-mentioned steps 601～step 608 has been described the flow process that the user side access device is safeguarded the method better embodiment of the subscriber equipment corresponding relation that the group that comprises P-VLANTag, multicast identifier and user network label C-VLAN Tag identify, wherein step 602～step 607 is described is to join message or during the multicast group leave message when multicast group that the user side access device receives the subscriber equipment transmission, safeguard the situation of described corresponding relation, this mode makes the user side access device according to the described corresponding relation of messages sent by user equipment active maintenance.What step 608 was described is when network equipment is initiated inquiry, the user side access device is safeguarded the situation of described corresponding relation, the user side access device is suppressed the member relation query report that subscriber equipment sends, only optionally send one or more member relation query report, guaranteed the network bandwidth between user side access device and the network equipment like this to network equipment.
The flow process of the implementation method better embodiment of the IGMP Snooping that the embodiment of the invention provides, can be applied in the realization system of the IGMP Snooping that the embodiment of the invention shown in Figure 3 provides, Fig. 7 shows the flow chart of the implementation method of the IGMP Snooping that the embodiment of the invention provides based on system shown in Figure 3, in this flow process, the maintenance of user side access device comprises the group of P-VLAN Tag, multicast identifier and the multicast reception table of the subscriber equipment corresponding relation that C-VLAN Tag identifies, and this flow process also comprises:
Step 701: the multicast message that multicast router will carry P-VLAN Tag and multicast identifier sends to the user side access device.
In this step, multicast router is the multicast message encapsulation individual layer P-VLAN 1 that carries multicast identifier G1, and the multicast message that carries multicast identifier G1 and P-VLAN 1 is sent to the user side access device.
Step 702: the user side access device obtains P-VLAN Tag and multicast identifier from multicast message.
In this step, the user side access device obtains P-VLAN 1 and multicast identifier G1 from multicast message.
Step 703: the user side access device receives the table from multicast, searches first forward node of the group correspondence that comprises P-VLAN Tag, multicast identifier.
In this step, the user side access device receives the table from multicast, searches to comprise P-VLAN 1, first forward node of the group correspondence of G1.
Step 704: the user side access device judges whether the forward node that finds is empty, execution in step 705 when forward node is not empty, process ends when forward node is empty.
In this step, receive list structure according to embodiment of the invention multicast shown in Figure 2, the user side access device receives the table from multicast, finds to comprise P-VLAN 1, first forward node of the group correspondence of G1 comprises C-VLAN 2 and outbound port PORT 1, continues execution in step 705.
Step 705: the user side access device takes out C-VLAN Tag and outbound port sign from forward node, the P-VLAN Tag in the multicast message is replaced to C-VLAN Tag.
In this step, the user side access device takes out C-VLAN 1 and PORT 1 from forward node, the P-VLAN in the multicast message 1 is replaced to C-VLAN 1.
Step 706: the user side access device sends multicast message on outbound port.
In this step, the user side access device sends multicast message on the outbound port of PORT 1 sign, just multicast message is sent to first switch 304 by PORT 1.
Step 707: the user side access device moves redirect execution in step 704 after with the node pointer in the multicast reception table.
In this step, the user side access device moves after with the node pointer in the multicast reception table, redirect execution in step 704, find second forward node C-VLAN 3 and outbound port PORT 4, continue execution in step 705～706, through above-mentioned steps 705～step 706, the user side access device sends to the 4th switch 307 with multicast message by PORT 4.The user side access device moves after with the node pointer in the multicast reception table, finds the 3rd forward node for empty, process ends, and node pointer jumps to first forward node of this group simultaneously.
In the flow process of better embodiment based on system shown in Figure 3 of the implementation method of the IGMP Snooping that the invention described above embodiment provides, the better embodiment of the implementation method of the IGMPSnooping that system shown in Figure 3 provides according to the embodiment of the invention is carried out the distribution of multicast message, multicast router need not multicast message is duplicated the umber identical with subscriber equipment under the C-VLAN, thereby alleviated the flow load of QinQ network, save the network bandwidth, realized real distribution as required.
In this method flow process, the user side access device is safeguarded multicast reception table by the message that listen for user equipment sends.The messages sent by user equipment type has two kinds, and promptly multicast group joins message or the multicast group leave message, and the subscriber equipment message that inquiry sends at network side is the member relation query report.Multicast receives list structure as shown in Figure 4, supposing that a kind of situation promptly comprises in the group of P-VLAN 1 and G1 includes only the PORT4 of corresponding the 4th switch 307 and the forward node that C-VLAN 3 forms, joining message with first switch, 304 transmission multicast group G1 earlier is that example is described the flow process that subscriber equipment adds multicast group, sending multicast group G1 leave message with the 4th switch 307 again is that example is described the flow process that subscriber equipment leaves multicast group, and this flow process comprises:
Step 601a: the user side access device obtains C-VLAN Tag and multicast identifier from messages sent by user equipment, message is that multicast group is when joining message, execution in step 602a, when message is the multicast group leave message, execution in step 605a, when message is the member relation query report, execution in step 608a.
Step 602a: what the transmission multicast group joined message is first switch 304, the user side access device finds the group that comprise P-VLAN 1 and multicast identifier G1 corresponding with it according to C-VLAN 1 and multicast identifier G1 in multicast reception table, comprise the forward node that increases C-VLAN 1 and outbound port sign PORT1 in the group of P-VLAN 1, multicast identifier G1 in multicast reception table.
Step 603a: whether first exchange 304 of sending among the determining step 602a that multicast group joins message is first member in the multicast group that adds of requirement, if execution in step 604a, if not process ends then.According to the invention process example assumes, first switch 304 is not first member that requirement adds multicast group G1, then can go into the handling process that equipment joins message to multicast group by the end user side joint.When first switch 304 is first member of requirement adding multicast group G1, continue execution in step 604a.
Step 604a: the user's message receiver module of user side access device in multicast router sends multicast group G1 and joins message, after the user's message receiver module of multicast group router is made response to this message, the user side access device receives in the table at multicast, increase the group that comprises P-VLAN 1, this multicast identifier G1, and in group, increase the C-VLAN 1 of first switch 304 and the forward node of PORT1 composition.
Step 605a: what send the multicast group leave message is the 4th switch 307, the user side access device finds the group that comprise P-VLAN 1 and multicast identifier G1 corresponding with it according to C-VLAN 3 and multicast identifier G1 in multicast reception table, receive in the table at multicast, deletion comprises group and the C-VLAN 3 of correspondence and the forward node of outbound port sign PORT4 of P-VLAN 1, multicast identifier G1.
Step 606a: whether the 4th switch 307 that sends the multicast group leave message among the determining step 605a is last member of the multicast group G1 that leaves of requirement, if execution in step 607a, if not process ends then.According to supposing in the embodiment of the invention that the 4th switch 307 is not last member that multicast group G1 is left in requirement, then can go into the handling process of equipment by the end user side joint to the multicast group leave message.When the 4th switch 307 is when leaving last member of multicast group message, continue execution in step 607a.
Step 607a: the user side access device receives in the table at the multicast of safeguarding, the group that comprises P-VLAN 1, G1 that deletion finds reaches the corresponding relation of the 4th switch 307 that identifies with the C-VLAN 3 that sends this multicast group leave message, and the user's message receiver module in multicast router sends multicast group G1 leave message again.
Through step 601a～step 607a, comprise in the group of P-VLAN 1, G1 in the multicast reception table, include only the forward node that C-VLAN 1, PORT1 form.
Step 608a: the user side access device receives the member relation query report that first switch 304 sends.If comprise in the group of P-VLAN 1, G1 and also comprise other forward node, the user side access device is suppressed the member relation query report of the switch transmission of these forward node correspondences, the member relation query report of promptly only selecting one or more switches to send sends to process ends behind the enquiry module in the multicast router, to guarantee the network bandwidth between user side access device and the multicast router.
Above-mentioned steps 601a～step 608a, described user side access device shown in Figure 6 and safeguarded the flow process of the better embodiment of multicast reception table based on system shown in Figure 3, wherein step 601a～step 607a is to be to receive that multicast group that subscriber equipment sends joins message or during the multicast group leave message when the user side access device, safeguard the situation of described corresponding relation, this mode makes the user side access device according to the described corresponding relation of messages sent by user equipment active maintenance.Step 608a is for when network equipment is initiated inquiry, the user side access device is safeguarded the feelings of described corresponding relation, the user side access device is suppressed the member relation query report of the switch transmission of forward node correspondence, has guaranteed the network bandwidth between user side access device and the multicast router.Corresponding different type of messages can select above-mentioned different step to handle.
At last, the implement device of the IGMP Snooping that the embodiment of the invention is provided is elaborated.Fig. 8 shows the structural representation of the implement device of the IGMP Snooping that the embodiment of the invention provides, and this device is user side access device 801, comprises transceiver module 802, parsing module 803 and memory module 804.
Memory module 804 is connected with parsing module 803, stores the multicast reception table of the subscriber equipment corresponding relation of the group that comprises P-VLAN Tag, multicast identifier and C-VLAN Tag sign.
Transceiver module 802, be connected with parsing module 803, what be used for receiving sends the multicast messages that carry P-VLAN Tag and multicast identifier by user side access device 801 outsides, send to parsing module 803, according to the lookup result that parsing module 803 is sent into, the multicast message that use C-VLAN Tag replaces behind the P-VLANTag is sent into external user equipment.
Parsing module 803, be connected respectively with memory module 804 with transceiver module 802, be used to receive the multicast message that carries P-VLAN Tag and multicast identifier that transceiver module 802 is sent into, search the corresponding relation of the subscriber equipment of the group that comprises P-VLAN Tag, multicast identifier and C-VLANTag sign in the multicast reception table from memory module 804, lookup result is offered transceiver module 802.
The implement device of the IGMP Snooping that the invention described above embodiment provides, transceiver module 802, parsing module 803 and memory module 804 cooperate finishes following function jointly: maintenance comprises the multicast reception table of the corresponding relation of the group of P-VLANTag, multicast identifier and the subscriber equipment that C-VLAN Tag identifies, from multicast reception table, find the subscriber equipment that needs the receiving group message after receiving multicast message, the C-VLAN Tag of the subscriber equipment that use finds sends to subscriber equipment with multicast message after replacing the P-VLAN Tag of multicast message.In this way, multicast message only is distributed to the subscriber equipment that needs multicast message under the C-VLAN, thereby need not when making network equipment send multicast message earlier multicast message to be copied as with C-VLAN Tag under the identical umber of number of user equipment, alleviated the flow load between network side and the user side, save the network bandwidth, realized real distribution as required.Said apparatus can be a user side access device 801, also can be other devices that possess above-mentioned same structure and function.
In embodiments of the present invention, when sending subscriber equipment that multicast group joins message for the subscriber equipment of first this multicast group of application adding, the user side access device joins message to this multicast group that network equipment sends, leave the subscriber equipment of this multicast group for last application when the subscriber equipment that sends the multicast group leave message, this multicast group leave message that the user side access device sends to network equipment, and the user side access device is to the member relation query report of network equipment transmission, the user side access device is when sending above-mentioned user side to the message of network side, send to network equipment again after can be earlier the C-VLAN Tag of message being replaced with P-VLAN Tag, can know other modes of the public network label of this message in the time of also can adopting other to make network equipment receive the message that user side sends, for example the user side access device encapsulates one deck P-VLAN Tag again on the C-VLAN Tag that carried originally of subscriber equipment transmission message, rather than adopts the mode that C-VLAN Tag is replaced with P-VLAN Tag.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.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 that a kind of IGMP is intercepted, it is characterized in that, the user side access device is safeguarded and is comprised public network label P-VLAN Tag, the corresponding relation of the subscriber equipment of the group of multicast identifier and user network label C-VLAN Tag sign, be specially: the multicast group that the user side access device receives the subscriber equipment transmission joins message, according to C-VLAN Tag and the multicast identifier in the message, in described corresponding relation, find the corresponding group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that group that increase finds and transmission multicast group join message, if in described corresponding relation, do not find the corresponding P-VLAN Tag that comprises, the group of multicast identifier, the user side access device sends described multicast group to network equipment and joins message, after network equipment was made response, the increase of described user side access device comprised P-VLAN Tag, the group of this multicast identifier reaches the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that joins message with this multicast group of transmission; This method also comprises:
A, user side access device receive the multicast message that carries P-VLAN Tag and multicast identifier that network equipment sends;
B, user side access device are searched the subscriber equipment of corresponding C-VLAN Tag sign according to P-VLAN Tag and multicast identifier in the multicast message according to described corresponding relation;
After C, user side access device replace to the C-VLANTag that finds with the P-VLAN Tag in the multicast message, send to the subscriber equipment of C-VLAN Tag sign.
2, the method for claim 1 is characterized in that, described user side access device safeguards that the method for described corresponding relation further comprises:
Described user side access device receives the multicast group leave message that subscriber equipment sends, according to C-VLAN Tag and the multicast identifier in the message, in described corresponding relation, search the corresponding group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign of group that deletion finds and transmission multicast group leave message.
3, method as claimed in claim 2 is characterized in that, if the only corresponding subscriber equipment that sends this multicast group leave message of the group that comprises P-VLAN Tag and multicast identifier that finds in described corresponding relation, this method further comprises:
Described user side access device deletion comprises that the group of P-VLAN Tag, this multicast identifier reaches the corresponding relation of the subscriber equipment that identifies with the C-VLAN Tag that sends this multicast group leave message, sends described multicast group leave message to network equipment again.
4, the method for claim 1, it is characterized in that, the corresponding relation that described user side access device is safeguarded, be to comprise the group of P-VLAN Tag, multicast identifier and the corresponding relation of forward node, each forward node comprises the outbound port of C-VLAN Tag, user side access device and C-VLAN Tag identifying user equipment.
5, the realization system intercepted of a kind of IGMP is characterized in that this system comprises: network equipment, user side access device and subscriber equipment;
Described network equipment will carry the multicast message of P-VLAN Tag and multicast identifier, send to the user side access device by the QinQ network;
Described user side access device, be used for service equipment and comprise P-VLAN Tag, the corresponding relation of the subscriber equipment of the group of multicast identifier and C-VLAN Tag sign, being specially the multicast group that receives the subscriber equipment transmission joins message, according to C-VLAN Tag and the multicast identifier in the message, in described corresponding relation, find the corresponding group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that group that increase finds and transmission multicast group join message, if in described corresponding relation, do not find the corresponding P-VLAN Tag that comprises, the group of multicast identifier, sending described multicast group to network equipment joins message, after network equipment was made response, increase comprised P-VLAN Tag, the group of this multicast identifier reaches the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that joins message with this multicast group of transmission; P-VLAN Tag and multicast identifier that the multicast message that sends according to network equipment carries, search the subscriber equipment that the C-VLAN Tag sign of corresponding relation is arranged with the group that comprises P-VLAN Tag, multicast identifier according to described corresponding relation, after P-VLAN Tag in the multicast message replaced to the C-VLAN Tag that finds, send to the subscriber equipment of C-VLAN Tag sign;
Described subscriber equipment is used to receive the multicast message that the user side access device sends; Sending described multicast group joins message.
6, system as claimed in claim 5, it is characterized in that, described corresponding relation is: comprise the group of P-VLANTag, multicast identifier and the corresponding relation of forward node, forward node comprises the outbound port of C-VLAN Tag, user side access device and C-VLAN Tag identifying user equipment.
7, system as claimed in claim 5 is characterized in that, described network equipment comprises multicast source and multicast router;
Described multicast source is used for sending the multicast message that carries multicast identifier to multicast router;
Described multicast router is used for the multicast message that the receiving group source sends, for sending to described user side access device behind the multicast message encapsulation P-VLAN Tag.
8, system as claimed in claim 7 is characterized in that, described multicast router also comprises the user's message receiver module, is used to receive the message that described subscriber equipment is sent into by the user side access device.
9, system as claimed in claim 5 is characterized in that, described subscriber equipment also sends the multicast group leave message.
10, the implement device that a kind of IGMP is intercepted, it is characterized in that, maintenance comprises P-VLAN Tag, the corresponding relation of the subscriber equipment of the group of multicast identifier and C-VLAN Tag sign, be specially: the multicast group that receives the subscriber equipment transmission joins message, according to C-VLAN Tag and the multicast identifier in the message, in described corresponding relation, find the corresponding group that comprises P-VLAN Tag and multicast identifier, the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that group that increase finds and transmission multicast group join message, if in described corresponding relation, do not find the corresponding P-VLAN Tag that comprises, the group of multicast identifier, sending described multicast group to network equipment joins message, after network equipment was made response, increase comprised P-VLAN Tag, the group of this multicast identifier reaches the corresponding relation of the subscriber equipment of the C-VLAN Tag sign that joins message with this multicast group of transmission;
This device comprises transceiver module, parsing module and memory module;
Described transceiver module is used to receive the multicast message that carries P-VLAN Tag and multicast identifier that network equipment sends, and is transferred to parsing module; According to the lookup result of parsing module, the P-VLAN Tag of multicast message replaced with C-VLAN Tag after, send to the subscriber equipment of C-VLAN Tag sign;
Described parsing module, be used to receive the multicast message of transceiver module transmission, according to P-VLAN Tag and the multicast identifier in the multicast message, in the memory module stored relation, search the corresponding relation of the subscriber equipment of the group that comprises this P-VLANTag, multicast identifier and C-VLAN Tag sign, obtain sending to transceiver module behind the lookup result;
Described memory module is used to store the corresponding relation of the subscriber equipment of the group that comprises P-VLAN Tag, multicast identifier and C-VLAN Tag sign.
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