CN101605040B - Multicast control method under single-port and multi-user access mode and device - Google Patents

Abstract

A method for controlling multicast in a single-port multi-user access mode, comprising: when a broadband access device receives an IGMP message for joining or leaving a multicast group of a port, it processes accordingly: after confirming that the joining message is reasonable, it extracts Its information, thus judging that the multicast group node of the port does not exist, then establish the multicast group node and its characteristic information record of the port, and update the time value in the record to the initial value; then enter into Corresponding processing; or, after confirming that the leave message is reasonable, extract its information, thereby judging that the multicast group node of the port exists and has a corresponding characteristic information record, then clear the record; when it is determined that the fast leave function is enabled and the multicast All feature information records in the group node are empty, and enter corresponding processing according to the working status of IGMP. The invention reduces the interference generated when users of the same port switch channels, and saves bandwidth resources of the port.

Description

Multicast control method and device in single-port multi-user access mode

technical field

The present invention relates to the multicast control technology in the Internet Protocol Television (IPTV) service in the field of data communication, in particular to a multicast channel control method and device for broadband access equipment in single-port multi-user access mode.

Background technique

With the increasing maturity of broadband network technology, streaming media is widely used in many services such as video on demand, network teaching and network broadcasting due to its intuition, real-time and interactive characteristics. A further development is that IPTV has become a hot spot in the fixed network field, and multicast-based TV services are the core of IPTV services. Operators attach great importance to the multicast support capabilities of broadband access equipment in IPTV systems.

At present, in the application of IPTV services, how to better realize the controllability of users' on-demand, so as to ensure the quality of users' video streams and save the bandwidth of operators, has always been a problem faced by the development of IPTV technology.

The prior art mainly adopts two technical solutions to realize the controllability of on-demand programs in the IPTV service: one is based on the traditional Internet Group Management Protocol (IGMP, Internet Group Management Protocol) technical solution, and the other is based on IGMP On the basis of the technical solution, a fast-leave solution in which a multicast channel fast-leave (Fast-Leave) function is added.

Figure 1 is a schematic diagram of IPTV service networking. Wherein, the multicast router is connected with the IPTV network, and the multicast users (TV1-TV3) access through the broadband access device providing multicast proxy function, and then connect with the multicast router. For multicast users, the broadband access device implements the function of a multicast router, that is, by receiving the join and leave requests of multicast users, periodically sending query messages to maintain the membership of multicast groups; for multicast routers In other words, a multicast proxy device (that is, a broadband access device) is a multicast host that obtains or cancels a service of a multicast group on a multicast router by sending a join or leave request. Multicast users and broadband access devices, and broadband access devices and multicast routers communicate with each other through the IGMP protocol.

The IGMP protocol stipulates that when a multicast router receives a leave message from a multicast user on a port, it needs to send a multicast specific group query message and wait for responses from other users that may exist in the multicast group to determine the number of users on the port. Whether there are other multicast users in this group in the connected network, only when it is confirmed that there are no other users in this multicast group, can this port be deleted from the entry of this multicast group, thus ensuring that a user leaves Other users belonging to the same multicast group as this user will not be affected.

However, the delay caused by the above-mentioned process of multicasting a specific group query message brings problems in the actual application of IPTV services. In the IPTV service provided by the multicast technology, the user's channel switching operation includes: sending an IGMP leave message of the original channel, and sending an IGMP join message of the new channel. When the multicast access device (that is, the broadband access device) receives the IGMP leave message, it will not immediately interrupt the original video stream, but will send an IGMP specific group query message and wait for the user to respond to the IGMP join After receiving the message, it will decide whether to interrupt the video program stream; this will cause the new and old program streams to be delivered at the same time, which wastes a lot of bandwidth. For example, when a user quickly browses multiple channels in sequence, from channel 1 to channel n, the video streams of n channels will be sent to a multicast service port of the multicast access device at the same time within a period of time, which may greatly Exceeding the downlink bandwidth of the service port will result in packet loss and delay, causing the quality of the user's video program to drop sharply, or even make it impossible to watch.

In order to solve the above problem, the prior art adopts a multicast user fast-leave (Fast-Leave) scheme based on the IGMP protocol, which can quickly interrupt the program flow of the multicast user. Fig. 2a shows a schematic diagram of overlapping program streams when the user switches channels with the quick leave function turned off, and Fig. 2b shows a schematic diagram of almost no overlapping of program streams when the user switches channels with the fast leave function turned on. If the Fast-Leave function is used in the IPTV service application, when a user switches channels, the multicast access device immediately removes the port from the left multicast group after receiving the IGMP leave message of the original channel through the port. Delete the table entry, stop forwarding the video stream of the original channel, and avoid the simultaneous delivery of the old and new channel program streams, so that at any time, one port can only forward the program of one channel to save device bandwidth. However, the above-mentioned fast leaving scheme is only applicable to the situation where there is only one multicast user under one service port of the multicast access device (that is, single port and single user), and for the case of accessing multiple multicast users under one service port ( Single-port multi-user), there are new problems.

As shown in Figure 3, the broadband access device adopts the quick departure solution in the IPTV service application. It can be seen that when set-top boxes (STB, Set Top Box) STB1, STB2, and STB3 watch channel 1 programs at the same time, the broadband access device will only send down a video stream of channel 1, and then copy it into three copies through the home gateway The video stream is transmitted to STB1, STB2 and STB3 respectively; but when the user of STB1 switches the channel to channel 2, STB1 will send the leaving message of channel 1 and the joining message of channel 2, and the broadband access device will stop immediately The program stream of channel 1 is forwarded, and the program stream of channel 2 starts to be sent, which causes the program stream of channel 1 being watched by STB2 and STB3 to be interrupted. flow will resume. In this way, mutual interference occurs during the channel switching process of multiple multicast users, which leads to the degradation of the viewing quality of the users.

Contents of the invention

The technical problem to be solved by the present invention is to propose a multicast control method and device in a single-port multi-user access mode, which can enable different users on the same port to watch IPTV programs without interfering with each other, and can reduce the uninterrupted user ports. Necessary multicast traffic bandwidth occupation.

In order to solve the above-mentioned technical problems, the present invention provides a multicast control method in a single-port multi-user access mode, comprising: the broadband access device receives an Internet group management protocol IGMP message of a port,

When the message is a message for joining a multicast group, the message processing is carried out: after confirming that the message is reasonable, extract the information of the message, and if it is judged that the multicast group node of the port does not exist according to the information, then establish the Record the multicast group node and its corresponding feature information, and update the time value field in the feature information to the initial value; after completing the update of the time value field, determine to enter the corresponding IGMP process according to the working status of IGMP;

When the message is a leave multicast group message, perform leave message processing: after confirming that the message is reasonable, extract the information of the message, and according to the information, if it is judged that the multicast group node of the port exists and has corresponding characteristic information record, then clear the feature information record; when it is determined that the fast leave function is enabled and all feature information records in the multicast group node are empty, determine to enter the corresponding IGMP process according to the working status of IGMP.

Further, the characteristic information also includes one or more of the source IP address or the source MAC address of the user of the port and the VLAN information of the virtual local area network; If the group node exists and has the corresponding characteristic information record, then directly update the time value field in the characteristic information; or, if it is judged that the multicast group node of the port exists, but there is no corresponding characteristic information record, then create the characteristic information record, and update the time value field in the feature information.

Further, the leaving message is processed, and when it is determined that the fast leaving function is not enabled, it is determined to enter corresponding IGMP processing according to the working status of IGMP.

Further, before the above method is executed, it also includes: establishing a global multicast group linked list array structure for each port on the broadband access device, for recording all multicast groups on the port, and using the multicast group as an index , to uniquely identify a node, set the feature information array of the port user in the node to record the source IP address or source MAC address of the user, and assist in setting the time value field; the initial value of the time value, in the Snooping mode of IGMP Assigned as the aging time, in IGMP proxy mode, assigned as the last group member query interval plus 1.

Further, the above method also includes: defining a timer for the users who leave abnormally in the multicast group of the port, and presetting the timeout period for the timer; when the timer times out and overflows, enable the fast leaving function Under the premise of traversing the feature information record items of the multicast group nodes of the port, the time value in it is reduced by 1; when it is judged that the time values of all feature information record items are reduced to 0, the multicast group and its feature information The record item is deleted from the port; the user who leaves abnormally is the user who does not send a multicast group message to the broadband access device and does not use the multicast group for a long time.

In order to solve the above-mentioned technical problems, the present invention provides a multicast control device in a single-port multi-user access mode, including: a message processing module for joining, a storage module, a message processing module for leaving, and IGMP processing for entering the Internet Group Management Protocol module, where:

Join the message processing module, which is connected with the storage module and the IGMP processing module respectively, and is used to extract the information in the added message that is confirmed as legal. If it is judged that the corresponding multicast group node does not exist according to the information, then create the The multicast group node and its corresponding feature information record, and update the time value field in the feature information to the initial value; after completing the update of the time value field, store the multicast group node data structure of the port in the storage module, and output the added message to the IGMP processing module for processing;

The storage module is used as a storage medium for the multicast group node data structure of the port established during the processing of the joining message or leaving the message;

The leaving message processing module is respectively connected with the storage module and the entering IGMP processing module, and is used to extract the information in the leaving message confirmed to be legal. According to the information, if it is judged that the corresponding port group node exists and has corresponding characteristics information record, then clear the feature information record; when it is determined that the fast leaving function is enabled and all feature information records in the multicast group node are empty, the leaving message is output to the IGMP processing module for processing;

Enter the IGMP processing module, which is used to determine whether to enter IGMPSnooping processing or enter IGMP Proxy processing according to the working status in the input message.

Further, the feature information created by the added message processing module also includes one or more of the source IP address or source media access control MAC address and virtual local area network VLAN information of the user of the port; The multicast group node of this port exists and has corresponding feature information records, then directly update the time value field in the feature information; or, if it is judged that the multicast group node of this port exists, but there is no corresponding feature information record, Then create the characteristic information record, and update the time value field in the characteristic information.

Further, when the leaving message processing module determines that the fast leaving function is not enabled, it outputs the leaving message to the incoming IGMP processing module for processing.

Further, the above-mentioned device also includes a message content sorting module, which is respectively connected with the adding message processing module and the leaving message processing module, and is used to perform content sorting on the received IGMP messages, and sort the added messages received by sorting. After the legitimacy of the outgoing message or the leaving message is confirmed accordingly, it is correspondingly output to the joining message processing module and the leaving message processing module for processing.

Further, the message content sorting module is also connected to the storage module, and is used to establish a global multicast group linked list array in the storage module for each port of the broadband access device before the broadband access device performs multicast control structure, to record all the multicast groups of the port, and use the multicast group as an index to uniquely identify a node, set the feature information array of the port user in this node, and assist in setting the time value field; the time value field The initial value is the aging time in IGMP Snooping mode, and the last group member query interval plus 1 in IGMP Proxy mode.

Further, the above-mentioned device also includes an aging processing module, which is connected to the storage module, and is used to define a timer for users who leave abnormally in the multicast group of the port, and preset a timeout period for the timer; when the timer times out When overflowing, on the premise that the fast leave function is enabled, traverse the feature information record items of the multicast group nodes of the port, and subtract 1 from the time value; when it is judged that the time values of all feature information record items are reduced to 0, Then delete the multicast group and its characteristic information record items from the port; the users who leave abnormally, that is, users who do not send the leave multicast group message to the broadband access device and do not use the multicast group for a long time.

In the application scenario where the single-port multi-user access mode and the multicast quick leave function are turned on, the present invention can reduce the mutual interference generated by users of the same port during the channel switching process, and can reduce the transmission of useless program streams as much as possible. In this way, the bandwidth resource of the port is saved, thereby providing a better viewing experience for the user.

Description of drawings

Fig. 1 is the network diagram of existing IPTV service;

Fig. 2a is a schematic diagram of overlapping program streams in the process of channel switching by the user when the quick leave function is disabled;

Fig. 2b is a schematic diagram of almost no overlapping of program streams in the process of channel switching by the user when the quick leave function is turned on;

Fig. 3 is the IPTV service experience diagram of single-port multi-STB users according to the prior art;

Fig. 4 is the schematic structural diagram of the port multicast group linked list set up on the broadband access device realizing the method of the present invention;

Fig. 5 is the flowchart of the user side IGMP protocol message processing method under the single port multi-user mode of the present invention;

FIG. 5a is a flowchart of a method for processing a joining message received in a single-port multi-user mode of the present invention;

FIG. 5b is a flowchart of a method for processing a leave message received in a single-port multi-user mode of the present invention;

FIG. 6 is a flow chart of the present invention for the aging processing of abnormal departure of users in single-port multi-user mode;

FIG. 7 is a structural block diagram of an embodiment of an apparatus for processing IGMP protocol packets at the user side in a single-port multi-user mode according to the present invention.

Detailed ways

The multicast control method under the single-port multi-user access mode of the present invention comprises the steps: the broadband access device receives an IGMP protocol message of a port, and when the message is a message for joining a multicast group, determines the message After the text is reasonable, the information of the message is extracted. According to the information, if it is judged that the multicast group node of the port does not exist, then the multicast group node of the port and its corresponding feature information record will be established, and the time value field in the feature information will be updated as The initial value; then, according to the working state of IGMP, it is determined to enter the corresponding IGMP processing; when the message is leaving a multicast group message, after confirming that the message is reasonable, extract the information of the message, and judge the group of the port according to the information If the multicast group node exists and has the corresponding feature information record, then clear the feature information record; when it is determined that the fast leave function is enabled and all feature information records in the multicast group node are empty, determine the entry according to the working status of IGMP Corresponding IGMP processing.

For users who leave abnormally in the multicast group of the port (the user who has not sent the leave multicast group message to the broadband access device and does not use the multicast group for a long time), define a timer, and set the timeout time for the timer in advance ;When the timer expires, under the premise that the fast leave function is enabled, traverse the characteristic information record items of the multicast group nodes of the port, and subtract 1 from the time value; when judging the time value of all characteristic information record items After both are reduced to 0, the multicast group and its characteristic information record items are deleted from the port.

The above-mentioned technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, not to limit the present invention.

First, a linked list structure is established for each port on the multicast proxy device (i.e. broadband access device) to form a global port multicast group (hereinafter referred to as port multicast group for short) linked list array, as shown in Figure 4 shown. The port group linked list of each port (port A, B, ...) records the multicast groups that exist on the port. The maximum number of multicast groups, for example, it is stipulated that the number of multicast groups that each user can join at the same time does not exceed 4, etc.).

The node in the port group linked list uses the multicast group as the index to uniquely identify a node. An array of port user characteristic information structures is set in this node, and the dimension of the array can be set as required (for example, based on the number of user STBs supported by each port, etc.). In the port user feature information structure (hereinafter referred to as feature information), the source IP address or source MAC address of the user STB is recorded, and a time value field is auxiliary set. The initial value of the time value is assigned as aging in the IGMP Snooping mode of the IGMP protocol. Time; in the IGMP Proxy mode of the IGMP protocol, it is assigned a value of (LastMemberQueryInterval+Δ), and the unit is seconds; where LastMemberQueryInterval is the last group member query time interval, and Δ is a positive small value, which can be 1 here. In this way, the original aging mechanism can be used in the case of a single port and a single user.

The present invention sets up a new time aging mechanism for users who leave the port group abnormally in the single-port multi-user access mode. By defining a timer and setting its time-out time in advance, combined with the initial value of the above-mentioned time value field, and After the timer is started, the timer overflows and then subtracts 1 from the time value until the time value is 0, so as to realize the time aging mechanism.

Fig. 5 shows the flow chart of user side IGMP protocol message processing method under the single-port multi-user mode of the present invention, and this flow process comprises the following steps:

501: The broadband access device receives an IGMP protocol message from a certain port;

502: Judging whether to join the multicast group message or leave the multicast group message, if it is the former, execute step 503; if it is the latter, execute step 505;

503: Process receiving and joining multicast group messages in single-port multi-user mode;

504: According to the working status of the IGMP protocol, it is determined to enter IGMP Snooping or IGMP Proxy processing, and then end the process;

505: Process the message leaving the multicast group received in the single-port multi-user mode;

506: Judging whether the conditions for entering the IGMP protocol processing are met, if yes, execute step 504, if not, end the process.

Here, the processing condition for entering the IGMP protocol is recorded during the process of leaving the multicast group message: under the premise that the port group node exists, if the fast leave function is enabled, and all the characteristic information in the port group is empty, then the condition Satisfied; or, if the quick leave function is off, the condition is met.

Under the single-port multi-user mode of the present invention, receiving and joining the multicast group message processing is step 503, and its flow process is as shown in Figure 5a, including the following steps:

5031: Determine the legality of adding the message, and extract the information required for subsequent processing in the message;

This information includes: port number, multicast group number, corresponding feature information (source IP address or source MAC address, time value field) and virtual local area network (VLAN, Virtual Local AreaNetwork) information in the multicast group (due to specific implementation In the mode, the multicast group is managed in the form of mvlan, and mvlan needs VLAN information), etc.;

5032: Determine whether the port group node exists according to the port (such as port A in Figure 4) and the multicast group (such as the multicast group G1 in Figure 4), if so, perform step 5033, otherwise perform step 5035;

5033: Determine whether the port group node (G1) has a corresponding record according to the feature information, if so (such as STB1, STB2 in Figure 4), execute step 5034, otherwise execute step 5036;

5034: Update the time value field of the port group node (G1) feature information (STB1, STB2) record, and then end the process;

Here, the time value recorded in the characteristic information of the port group node is reset to the initial value, so as to provide a basis for the aging processing of the user leaving abnormally (that is, not sending a message leaving the multicast group channel).

5035: Create a port group node;

5036: Create a feature information record of the port group node, and then execute step 5034.

In the above joining message processing flow, the port group and feature information items of the message will be recorded, and these information will provide a basis for leaving message processing.

The process of receiving and leaving the multicast group message under the single-port multi-user mode of the present invention is step 505, and its flow process is as shown in Figure 5b, including the following steps:

5051: Determine the legitimacy of the departure message, and extract relevant information in the message;

The relevant information includes: port number, multicast group number, and corresponding feature information (source IP address or source MAC address, time value field) in the multicast group, etc.;

5052: Determine whether the port group node exists according to the port and the multicast group, if so, execute step 5053, if otherwise, execute step 5057;

If the port group node does not exist, it will be regarded as an illegal leave message, and no subsequent processing will be performed.

5053: Empty the corresponding characteristic information record item in the port group node (including the source IP address or source MAC address and time value field of the STB);

5054: Determine whether the quick leave function is enabled, if so, execute step 5055, otherwise, execute step 5056;

5055: Judging whether all feature information records in the port group node are empty, if so, execute step 5056, otherwise, execute step 5057;

If there are other users under the same multicast group on the same port watching the channel program represented by the multicast group, no follow-up processing will be performed.

5056: The process ends after the record enters the IGMP protocol processing condition;

5057: The record enters the IGMP protocol processing condition and ends the process after it is not satisfied.

The above-mentioned leaving processing mechanism, due to the addition of the judgment of whether there are other users watching the channel program represented by the multicast group under the same group on the same port in the processing flow, that is, step 5055, so it solves the problem of multiple calls on a single port. The problem of users interfering with each other.

Figure 6 shows the aging processing flow that is added for the user to leave abnormally (that is, the leaving multicast group message is not sent up and the multicast group is not used for a long time). When triggered, including the following processes:

601: Judging whether the quick leave function of the system configuration is enabled, if so, execute step 602, if not, end the process;

602: Traversing the feature information records of the port group nodes, and decrementing the time value of the feature information record item by 1;

603. Determine whether all feature information records under the port group node are unused, that is, whether the time value of all feature information records is 0; if yes, execute step 604; otherwise, end the process, which means that there are still Other users in the multicast group cannot immediately delete the multicast group node;

604: Indicates that there are no other users in this multicast group under this port, so the multicast group node can be safely deleted, and then the process ends.

As shown in Figure 7, it is a structural block diagram of an embodiment of the multicast control device under the single-port multi-user access mode provided by the present invention, the device includes a message content sorting module 710, a message processing module 720, a storage Module 730, leaving message processing module 740, entering IGMP protocol processing module 750 and aging processing module 760, wherein:

Message content sorting module 710 is connected with joining message processing module 720 and leaving message processing module 730 respectively, and is used for carrying out content sorting to the received IGMP message, and adding the IGMP multicast group that sorting arrives into report After text or multicast group leaves the message and carries out legitimacy determination respectively, it is output to join message processing module 720 and leave message processing module 730 processing accordingly;

The message content sorting module 710 is also connected to the storage module 730, and is used to establish a global multicast in the storage module 730 for each port of the broadband access device before the broadband access device performs multicast control Group linked list array structure to record all multicast groups on the port, and use the multicast group as an index to uniquely identify a node, set the feature information array of the port user in this node to record the source IP address or source MAC of the user address, and assist in setting the time value field; the initial value of the time value field is assigned as the aging time in IGMP Snooping mode, and assigned as the last group member query time interval plus 1 in IGMP Proxy mode.

Adding message processing module 720, connected with storage module 730 and entering IGMP protocol processing module 750 respectively, used for extracting the information in the legal adding message, judging the existence of the corresponding port group node according to the port group information, and according to the characteristic If the information judges that the port group node has a corresponding record, update the time value field in the feature information record (that is, reset it to the initial value); if it judges that the corresponding port group node does not exist, create the corresponding port group node and the corresponding If it is determined that the corresponding port group node exists, but it is judged that the port group node does not have a corresponding record, then create the corresponding feature information record; then, update the time value field in the feature record; The port group node data structure is stored in the storage module 730, and the multicast group join message is output to the IGMP protocol processing module 750 for processing;

The storage module 730 is used as a storage medium for establishing or updating the data structure of the port group node during the processing of the join message or the leave message;

Leave message processing module 740, be connected with memory module 730 and enter IGMP protocol processing module 750 respectively, be used for extracting the information in the legal leaving message, judge corresponding according to port group information (port number, multicast group number) If the port group node exists, the corresponding record item in the storage module 730 is cleared according to the feature information; when it is confirmed that the quick leave function is turned on, and it is judged that all feature information record items in the port group in the storage module 730 are empty, or, Confirm that the fast leaving function is not opened, then the multicast group leaves the message output to enter the IGMP protocol processing module 750 for processing;

Enter the IGMP protocol processing module 750, for determining to enter IGMP Snooping processing or IGMP Proxy processing according to the IGMP protocol working state in the input message;

The aging processing module 760 is connected with the storage module 730, and is used for traversing the feature information records of the port group nodes when it is determined that the fast leaving function is enabled, and subtracting 1 from the time value of the feature information record items; When the time values of all characteristic information records are 0 (that is, the characteristic information record items of all users under the port group node are unused), delete the multicast group node.

The above embodiments are only used to illustrate the present invention, not to limit the present invention. For example, the division of each functional module in the above-mentioned device, or the name of each functional module, may adopt a structure or name that is different from the above-mentioned structure or a module with a different name but the same substantial function. Any device that is different in structure or in module names from the device of the present invention but has the same essential spirit shall fall within the scope of the claims of the present invention.

In summary, the present invention solves the problems existing in the application scenario where the single-port multi-user access mode and the multicast fast leave function are enabled, so that different users under the same port watch IPTV programs to perform channel switching process It can not interfere with each other, and reduce the transmission of useless program streams as much as possible, thus saving the bandwidth resource of the port; therefore, it can provide IPTV users with better viewing experience.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. the multicast control method under the single-port and multi-user access mode is characterized in that said method comprises:

On broadband access equipment, set up a global port group linked list array structure for each port; The port set chained list of each port is used to write down all multicast group that exist on the port, and is index with said multicast group; Node of unique identification; The characteristic information array of said port user is set in said node, with source IP address or the source MAC that writes down said user, and the auxiliary time value field that is provided with;

Broadband access equipment is received the IGMP IGMP message of a port,

When said message is the processing that joins message when adding the multicast group message: the information of confirming the said message of said message back extraction rationally; Do not exist if judge the multicast group node of said port according to said information; Then set up the multicast group node and the corresponding characteristic information record thereof of this port, and the time value field in the said characteristic information is updated to initial value; After the renewal of accomplishing said time value field, confirm to get into corresponding IGMP according to the operating state of said IGMP and handle;

When said message is to carry out leave message when leaving the multicast group message to handle: the information of confirming the said message of said message back extraction rationally; Exist if judge the multicast group node of said port according to said information; And have corresponding characteristic information record, then empty said characteristic information record; Confirm to leave fast function enables and said multicast group node in all characteristic informations records when being sky, confirm to get into corresponding IGMP according to the operating state of said IGMP and handle.

2. according to the described method of claim 1, it is characterized in that said characteristic information also comprises the user's of said port source IP address or in media access control MAC address, source and the virtual LAN VLAN information one or more; Carry out said joining message and handle, then directly the time value field in the said characteristic information is upgraded if judge the said multicast group node existence of said port and have corresponding said characteristic information record; Perhaps, exist if judge the multicast group node of said port, but do not have corresponding characteristic information record, then set up this characteristic information record, and the time value field in the said characteristic information is upgraded.

3. according to the described method of claim 2, it is characterized in that, carry out said leave message and handle, confirming saidly when leaving function fast and not enabling, confirm to get into corresponding IGMP according to the operating state of said IGMP and handle.

4. according to each described method of claim 1 to 3; It is characterized in that; The initial value of said time value, assignment is an ageing time under the Snooping of said IGMP pattern, assignment adds 1 at interval for last group membership's query time under the Proxy of said IGMP pattern.

5. according to the described method of claim 4, it is characterized in that said method also comprises:, define a timer, and time-out time is set in advance for said timer to the improper user who leaves in the multicast group of said port; When said timer expiry overflows, leave fast under the prerequisite that function enables said, travel through the characteristic information record of the multicast group node of said port, wherein said time value is subtracted 1; After the said time value of judging all said characteristic information record items all is kept to 0, said multicast group and said characteristic information thereof are write down item from said port deletion; The said improper user who leaves does not promptly send to said broadband access equipment and saidly leaves the multicast group message and do not use the user of said multicast group for a long time.

6. the multicast control device under the single-port and multi-user access mode is characterized in that said device comprises: the processing module that joins message, memory module, leave message processing module and get into IGMP IGMP processing module, wherein:

The said processing module that joins message; Be connected with said entering IGMP processing module with said memory module respectively; Being used for confirming as the legal information that joins message extracts;, then create said multicast group node and characteristic of correspondence information record thereof, and the time value field in the said characteristic information is updated to initial value if judging the multicast group node of corresponding ports does not exist according to said information; After the renewal of accomplishing said time value field, deposit the said multicast group node data structure of said port in said memory module, and said joining message exported to said entering IGMP processing module and handled;

Said memory module is used for joining message or the storage medium of the said multicast group node data structure of the said port that the leave message processing procedure is set up as said;

Said leave message processing module; Be connected with said entering IGMP processing module with said memory module respectively; The information that is used for confirming as legal leave message is extracted; Exist as if the multicast group node of judging corresponding ports according to said information, and have corresponding characteristic information record, then empty said characteristic information record; Confirm to leave fast function enables and said multicast group node in all characteristic informations records when being sky, said leave message is exported to said entering IGMP processing module handles;

Said entering IGMP processing module is used for confirming that according to the said message operating state of input entering IGMP Snooping handles or gets into IGMP Proxy and handles.

7. according to the described device of claim 6; It is characterized in that the said characteristic information that the said processing module that joins message is created also comprises the user's of said port source IP address or in media access control MAC address, source and the virtual LAN VLAN information one or more; The said processing module that joins message is then directly upgraded the time value field in the said characteristic information if judge the said multicast group node existence of said port and have corresponding said characteristic information record; Perhaps, exist if judge the said multicast group node of said port, but do not have corresponding characteristic information record, then set up this characteristic information record, and the time value field in the said characteristic information is upgraded.

8. according to the described device of claim 7, it is characterized in that said leave message processing module is being confirmed saidly when leaving function fast and not enabling, and said leave message is exported to said entering IGMP processing module handle.

9. according to each described device of claim 6 to 8; It is characterized in that; Said device also comprises message content go-on-go module, is connected with said leave message processing module with the said processing module that joins message respectively, is used for the IGMP message that receives is carried out the content go-on-go; And to go-on-go to said join message or said leave message is correspondingly carried out after legitimacy confirms, correspondingly export to said processing module and the said leave message processing module of joining message and handle.

10. according to the described device of claim 9; It is characterized in that said message content go-on-go module also is connected with said memory module, be used for before broadband access equipment carries out multicast control; In said memory module, set up the multicast group linked list array structure of an overall situation for each port of said broadband access equipment; Writing down all multicast group of said port, and be index with said multicast group, node of unique identification; The characteristic information array of port user is set in said node, and auxiliary said time value field is set; The initial value of said time value field, assignment is an ageing time under the Snooping of IGMP pattern, assignment adds 1 at interval for last group membership's query time under the Proxy of IGMP pattern.

11., it is characterized in that said device also comprises the burin-in process module according to the described device of claim 10; Be connected with said memory module; Be used for the improper user who leaves of multicast group, define a timer, and time-out time is set in advance for said timer to said port; When said timer expiry overflows, leave fast under the prerequisite that function enables said, travel through the characteristic information record of the multicast group node of said port, wherein said time value is subtracted 1; After the said time value of judging all said characteristic information record items all is kept to 0, then said multicast group and said characteristic information thereof are write down item from said port deletion; The said improper user who leaves does not promptly send to said broadband access equipment and saidly leaves the multicast group message and do not use the user of said multicast group for a long time.

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