WO2008049296A1

WO2008049296A1 - Method and system of igmp datagram transmission

Info

Publication number: WO2008049296A1
Application number: PCT/CN2007/000917
Authority: WO
Inventors: Yi Yao; Jian Feng; Juanjuan Chen
Original assignee: Zte Corporation
Priority date: 2006-10-24
Filing date: 2007-03-21
Publication date: 2008-05-02
Also published as: CN101170490A; CN101170490B

Abstract

An IGMP datagram transmission method and system, the system including at least a user terminal, IGMP datagram forwarding apparatus and IGMP datagram parsing apparatus; the method including the following steps: at least a user terminal transmits IGMP datagram to IGMP datagram forwarding apparatus, then the IGMP datagram forwarding apparatus receives and merges the IGMP datagram from the at least one user terminal and transmits the merged IGMP datagram to the IGMP datagram parsing apparatus; then the IGMP datagram parsing apparatus receives and parses the merged IGMP datagram from the IGMP datagram forwarding apparatus and processes the parsedIGMP datagram. The invention decreases IGMP datagram in the network, reduces the CPU processing time of multicast communication devices and as such achieves the purpose of increasing the number of multicast access users without changing the current processing ability.

Description

IGMP message transmission method and system

Technical field

The present invention relates to the field of communications, and in particular, to an IGMP (Internet Group Management Protocol) message transmission method and system.

Background technique

The multicast video service carried out on the current data network generally adopts the networking model as shown in Figure 1: The network system includes four components: a video service system, an IP metropolitan area network, a broadband access network, and a user network.

The video service system implements functions such as video user management and video coding, and sends the video service stream to the metropolitan area network; the IP metropolitan area network transmits the video service stream to the broadband access network through the IP multicast function; the broadband access network realizes the user broadband Internet access authentication management, video group join/leave control function, and send the video stream required by the user to the user; the user network includes CPE (Customer Premises Equipment), PC, video STB (Set Top Box) Devices, which are interconnected to form a home LAN. If users need to join or leave a certain channel, they need to send IGMP (Internet Group Management Protocol) to join or leave the message.

Broadband access networks typically include aggregation switches and edge devices such as DSLAM (Digital Subscriber Line Access Multiplexer). When the number of users is large, the aggregation switch needs to have strong processing capability for IGMP messages. Although the IGMP PROXY (proxy) function can be used on the edge device, when the user can select more channels, the suppressed message is limited.

When a PC or STB multicasts a multicast program, it uses the method of sending an IGMP REPORT to join the ^=艮文. There are three versions of IGMP, VI, V2, and V3. IGMPV ² is currently used. When the protocol number of the IP header is 2, it indicates that it is an IGMP message. The format of the IGMPV2 message content is shown in Figure 3:

Type: Indicates the IGMP 4 text type. 0x16 member report message, indicating joining a group;

0x17 leaves the message, indicating that it leaves a group;

0x11 member query, the multicast router is used to query whether a user exists, and is divided into a general query and a specific query. A specific query is to query whether a group has users; a general query is to query which group has users.

Max Response Time Maximum response time. The default value is 10 seconds. After receiving the query message, the response is sent to the REPORT message within this time.

Group Address, which indicates the group address to join or leave or a specific query. That is, when a user joins a channel, it needs to send a join message. When the edge device does not have IGMP PROXY, the packet is transparently transmitted from the edge device to the aggregation switch. When the IGMP PROXY is sent, the edge device sends the packet to the aggregation switch. The number, at least: The number of channels viewed by users accessing this edge device. Therefore, when there are more users and more channels to choose from, it is also necessary to aggregate the processing power of the switch. Summary of the invention

The present invention provides an IGMP packet transmission method and system, which can reduce IGMP messages on the network and reduce the CPU processing time of the multicast communication device.

The method for transmitting IGMP messages of the present invention includes the following steps:

Step S602: At least one user terminal sends an IGMP message to the IGMP message forwarding device.

Step S604, the IGMP message forwarding device receives and merges the IGMP message from the at least one user terminal, and sends the merged IGMP message to the IGMP message parsing device;

Step S606: The IGMP message parsing device receives and decomposes the merged IGMP message from the IGMP message forwarding device, and processes the decomposed IGMP message.

Further, the step S604 includes:

Step S604-2, the IGMP message forwarding device receives the at least one user terminal. And responding to the IGMP message and/or the message from the IGMP message parsing device; Step S604-4, when the timer timing time has not expired and the merged IGMP message does not reach the maximum transmission unit, the IGMP The message forwarding device merges the IGMP message;

Step S604-6, the IGMP message forwarding device calculates the checksum of the IGMP message, and inserts the checksum into the case that the IGMP message of the timer has expired or the merged IGMP message has reached the maximum transmission unit. The merged IGMP message is sent to the IGMP message parsing device.

Further, in the step S604-4, if the timer timing is not up and the merged IGMP message does not reach the maximum transmission unit, the IGMP packet forwarding device receives the IGMP report of the existing user. After the text, the IGMP message of the existing user is updated.

Further, the IGMP message includes an IGMP join message and an IGMP leave message, and the IGMP message forwarding device combines one or more versions of IGMP messages.

Further, in step S604-2:

If the IGMP join message is received, it is determined whether the user who sent the IGMP join message has been added, and if not, the export multicast forwarding table of the user is generated, and if it is added, the record is recorded and exited; as well as

In the case that the IGMP Leave message is received, it is determined whether the user who sent the IGMP Leave message is a fast leave, and if it is a fast leave, the information of the user is deleted from the multicast forwarding table. If it is slow to leave, ask the user if they really left.

Further, the step S604-2 includes:

When receiving the general query message from the IGMP message parsing device, determining whether the IGMP message forwarding device is an IGMP proxy; if not the IGMP proxy, broadcasting to the at least one user terminal a general query message; if the IGMP proxy is activated, it is determined whether the IGMP packet parsing device has an authentication function of the user; if the authentication function of the user is activated, all users of all groups are merged The IGMP message is merged with one user of each group if the authentication function is not used or the authentication function is in the IGMP message forwarding device itself.

Further, in the step S606: Whether the IGMP packet parsing device functions as a multicast user authentication function; if it is determined that the multicast user authentication function is used, it is determined whether the user can join the multicast group; if the user is not allowed to join, the record is recorded and exited. If the user is allowed to join, it is determined whether the port where the user is located exists in the forwarding table of the join multicast group. If not, the multicast forwarding table of the user is generated, and if yes, the record is recorded and exited.

Further, in step S606,

If the IGMP message is an IGMP join message and the checksum is correct, determining whether the IGMP message parsing device functions as a multicast user authentication; and determining that the multicast user authentication function is not In this case, it is determined whether the user has joined the multicast group; if not, the multicast forwarding table is generated, and if it has been joined, the user exits.

Further, in step S606:

If the IGMP message is an IGMP Leave message and the check is correct, it is determined whether the IGMP message parsing device functions as a multicast user, and is determined to have the multicast user authentication function. If the user has joined the multicast group, if the user has joined the multicast group, it is determined whether there are other users in the multicast group to leave and the IGMP message of the user. The port of the parsing device is the same; if it exists, it records and exits. If it does not exist, the multicast forwarding table is written and the port is deleted.

Further, the IGMP packet forwarding device is located at the user access side, and the IGMP packet parsing device is located at the user aggregation side; or

The IGMP packet forwarding device is located at the aggregation side of the user, and the IGMP packet parsing device is located at the broadband remote access server.

The present invention further provides an IGMP message transmission system, comprising: at least one user terminal, configured to send an IGMP message to an IGMP message forwarding device; and an IGMP message forwarding device, configured to receive and merge from the At least one user terminal's IGMP message, and the merged IGMP message is sent to the IGMP message parsing device;

The IGMP message parsing device is configured to receive and decompose the merged IGMP message from the IGMP message forwarding device, and process the decomposed IGMP message. Further, the IGMP message forwarding device includes:

a message receiving unit, configured to receive and respond to an IGMP message from the at least one user terminal, and receive a message from the IGMP message parsing device and respond;

The timer is used to control the time when IGMP messages are sent periodically.

The message merging unit is configured to merge the received IGMP message, and send the merged IGMP message to the IGMP message if the IGMP message has reached the maximum transmission unit. Parsing device;

The verification and calculation unit is configured to calculate the checksum of the IGMP message when the timer has expired or the merged IGMP message has reached the maximum transmission unit, and insert the checksum into the merged IGMP message. .

Further, the message merging unit updates the existing user's IGMP after receiving the IGMP message of the user after the timer has not arrived and the merged IGMP message does not reach the maximum transmission unit. 4 艮文.

Further, the message merging unit may combine one or more versions of the IGMP message; the IGMP message includes an IGMP join message and an IGMP leave message.

Further, the packet receiving unit determines whether the user who sends the IGMP join message has been added if the IGMP join message is received, and generates the egress multicast forwarding table of the user if not added; In the case of a message, it is determined whether the user who sent the IGMP Leave message is a fast leave. If yes, the user's information is deleted from the multicast forwarding table. If the message is slow, the user is instructed to ask whether the user left. .

Further, the message receiving unit, when receiving the general query message from the IGMP message parsing device, determines whether the IGMP message forwarding device functions as an IGMP proxy, and if not, broadcasts and receives to the at least one user terminal. If the IGMP proxy is used, it is determined whether the IGMP packet parsing device has authenticated the user. If it is up, it indicates that the packet merging unit merges IGMP messages of all users in all groups. If there is no authentication function or the authentication function is in the IGMP packet forwarding device itself, it indicates that the message merging unit merges the ^=艮 text of one user of each group.

Further, the IGMP message parsing apparatus includes: The inspection and verification unit is configured to check whether the inspection in the IGMP message received by the insurance is correct or not; the message parsing unit is configured to parse and process the received IGMP message in the case of verification and correctness;

The packet processing unit is configured to process the parsed IGMP join message, and the leave message processing unit is configured to process the parsed IGMP leave message.

Further, the join message processing unit determines whether the IGMP message parsing device functions as a multicast user authentication when the check and the correct one is determined; and determines whether the user can Add a multicast group. If the user is not allowed to join, record and log out. If the user is allowed to join, determine whether the port where the user is located exists in the forwarding table of the multicast group. If not, the multicast forwarding table of the user is generated. If yes, it is recorded and exited. If it is determined that there is no multicast user authentication function, it is determined whether the user has joined the multicast group. If not, the multicast forwarding table is generated. If it has been added, it is exited.

Further, the leaving message processing unit determines whether the IGMP message parsing device functions as a multicast user authentication when the check and the correct one is determined; and determines whether the user has joined the group if it is determined that the multicast user authentication function is activated. The broadcast group, if not, exits. If the user has joined the multicast group, it is determined whether there are other users in the multicast group to leave. The port is the same as the port where the IGMP packet parsing device is located. If it exists, the record is logged out. If it exists, write the multicast forwarding table and delete the port.

The present invention provides a method and system for reducing message processing on the basis of existing equipment. That is, the IGMP messages of multiple users are combined to reduce the number of IGMP messages on the network. BRIEF abstract

The drawings described herein are provided to provide a further understanding of the invention and constitute a part of this application. The illustrative embodiments of the present invention and the description thereof are intended to explain the present invention and are not intended to limit the invention. In the drawing:

1 is a schematic diagram of a networking structure of a multicast video system;

Figure 2 shows the IGMP V2 packet format.

3A through 3C are block diagrams of an IGMP message transmission system in accordance with the present invention;

4 is a combined IGMP message format of the present invention;

Figure 5 is a specific filling format of a user of the present invention;

6A and FIG. 6B are flowcharts showing a specific implementation of an IGMP message transmission method according to the present invention; FIG. 7 is a schematic diagram of a partial network structure of a multicast video system (the access control point and the multicast replication point are both in the DSLAM);

8A to 8C are diagrams showing a process of forming a merged message of the present invention;

9 is a schematic diagram of a partial network structure of a multicast video system (the access control point and the multicast replication point are both in a BRAS (Broadband Remote Server)); and FIG. 10 is a partial group of the multicast video system. Schematic diagram of the network structure (the access control point is in the DSLAM and the multicast replication point are in the DSLAM).

Preferred embodiment of the invention

The technical solution of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

Figure 3A is a block diagram of an IGMP message transmission system 300 in accordance with the present invention. As shown in FIG. 3A, the IGMP message transmission system includes: at least one user terminal 302, configured to send an IGMP message to the IGMP message forwarding device 304, and an IGMP4 message forwarding device 304, configured to receive and merge at least one The IGMP message of the user terminal, and the merged IGMP message is sent to the IGMP message parsing device 306; and the IGMP message parsing device 306 is configured to receive and decompose the merged IGMP message from the IGMP message forwarding device. And process the decomposed IGMP messages.

As shown in FIG. 3B, the IGMP message forwarding device 304 includes: a message receiving unit 304-2, configured to receive and respond to an IGMP message from at least one user terminal, and receive a message from the IGMP message parsing device and perform the message. Response; timer 304-4, used to control timing transmission The time of the IGMP message is: the message merging unit 304-6 is configured to merge the received IGMP message, and after the timer expires or the merged IGMP message has reached the maximum transmission unit, the message is merged. The IGMP message is sent to the IGMP message parsing device; and the checksum calculation unit 304-8 is configured to calculate the IGMP message if the IGMP message has reached the maximum transmission unit after the timer expires or the merged IGMP message has been reached. Checksum and insert the checksum into the merged IGMP message.

After the timer expires and the merged IGMP message does not reach the maximum transmission unit, the message merging unit updates the existing user's IGMP message after receiving the IGMP message from the user.

The message merging unit may combine one or more versions of IGMP messages.

The IGMP message includes an IGMP join message and an IGMP leave message.

Upon receiving the IGMP join message, the message receiving unit 304-2 determines whether the user who sent the IGMP join message has been added, and if not, generates the egress multicast forwarding table of the user; and receives the IGMP leave message. In this case, it is determined whether the user who sends the IGMP Leave message is a fast leave, if yes, the user's information is deleted from the multicast forwarding table, and if it is slow, the user is instructed to ask whether the user left.

The message receiving unit 304-2, when receiving the general query message from the IGMP message parsing device, determines whether the IGMP message forwarding device is an IGMP proxy, and if not, broadcasts the reception to at least one user terminal. The general query message is sent; if the IGMP proxy is activated, it is determined whether the IGMP message parsing device has authenticated the user. If so, the message merging unit 304-6 is instructed to merge all users of all groups. IGMP packet, if there is no authentication function from the device itself or an authentication function forwards the IGMP message, the user indicates a packet merging unit merging each group of packets Gen ^ ^1.

As shown in FIG. 3C, the IGMP file parsing device 306 includes: an inspection and verification unit 306-2 for verifying whether the checksum in the received IGMP4 message is correct; and the message parsing unit 306-4 for After the check and the correct case, the received IGMP message is parsed and processed; the join message processing unit 306-6 is configured to process the parsed IGMP join message; The message processing unit 306-8 is configured to process the parsed IGMP Leave message.

In the case of verification and correctness, the joining message processing unit 306-6 determines whether the IGMP message parsing device functions as a multicast user authentication; if it is determined that the multicast user authentication function is available, it is determined whether the user can join the multicast. If the user is allowed to join, the user is determined to be in the forwarding table of the multicast group. If not, the multicast forwarding table of the user is generated. If yes, the user logs in and exits. If it is determined that there is no multicast user authentication function, it is determined whether the user has joined the multicast group. If not, the multicast forwarding table is generated. If it has been added, the device exits.

In the case of the check and the correct, the leave message processing unit 306-8 determines whether the IGMP message parsing device functions as a multicast user authentication. If it is determined that the multicast user authentication function is activated, it is determined whether the user has joined the group. The broadcast group, if not, exits; if the user has joined the multicast group, it is determined whether the other user in the multicast group to leave is the same as the port of the IGMP packet parsing device where the user is located. If it exists, the record is logged out. If it exists, write the multicast forwarding table and delete the port.

The IGMP packet forwarding device 304 can be located on the user access side, and the IGMP packet parsing device 306 can be located on the user aggregation side.

The IGMP packet forwarding device 304 can be located at the aggregation side of the user, and the IGMP packet parsing device 306 can be located at the broadband remote access server.

The IGMP message forwarding device (device 1) of the present invention has the following features:

1. It can correctly accept user IGMP messages, and can merge IGMP messages and send them to device 2.

2. The user's characteristic information needs to be recorded: user IP address, user MAC address, port number where the user is located, and so on.

3. In order to send the combined IGMP messages in time, you need to set a timer. The timer period is 20 milliseconds by default. The size can be adjusted. If the timing period has not arrived, and the merged message has reached the MTU (Maximum Transmission Unit), it can be immediately sent to Image 2.

4. If the merged message has not been sent yet, and the user receives an IGMP message, the merged message that has not been sent has the IGMP message content of the user, which can clear the user's ^ Rong, merge the latest IGMP messages of this user.

5. It can be compatible with different versions of IGMP messages and receive different versions of IGMP incoming messages.

6. If the IGMP SNOOPING is received, the user receives the IGMP join message, and determines whether the user has joined. If not, the multicast forwarding table of the user exit is formed. If the packet is left, the user is determined to have Join, if not joined, exit directly; if it has been added, judge whether to leave quickly, and if so, remove the exit of this user from the multicast forwarding table. If it is slow to leave, send a specific group of query messages, ask the user if they really left.

The device 1 also has the following features:

1. Receive the general query message of device 2, and divide it into the device to see if it has an IGMP PROXY proxy. If it does not, the 4 bar general query message is broadcast to the user; if IGMP PROXY is activated, the device 2 needs to be judged. Or the device is configured with the authentication function of the multicast user. If the authentication function is enabled, IGMP messages of all users in all groups need to be merged and sent to device 2; if there is no authentication function or authentication function, the device is in the device. 1 itself, only need to merge the messages of one user in each group and send them to device 2. In this merged message, there is no leaving message.

2. In order to achieve the combined effect, the merged message is still an IGMP message, that is, the IP protocol number is still 2. You can use the format shown in Figure 4 and Figure 5:

Type Type=0xef : Multi-user join/leave.

Version Version: Currently 0x01, convenient for future expansion.

Checksum Checksum: The checksum is a 16-bit check of the length of the IGMP message (the entire payload of the IP packet). The field is set to 0, and the fields are wrapped together for calculation when calculating the checksum. When transferring a package, the insurance risk must be calculated and inserted into the domain. When receiving a packet, the checksum must be verified before processing the packet.

Number of User Records Number of Host Records: The number of user records indicates how many users are joining/leaving groups below.

User records Host Records: User records indicate the joining or leaving of a specific user. The specific user record format is shown in Figure 5:

The IGMP message is exactly the same as the IGMP message of the user. It is copied directly when the user joins or leaves.

User IP Address Host IP Address: The IP address when the user sends a join.

User MAC address Host MAC Address;

User sends the MAC address when joining and leaving

Vlan ID: The VLAN ID assigned to the user, or the VLAN ID of the user;

The Type, Length, and Value fields are a group of information indicating a type of information related to the user.

Type Type may take the following values:

Hostname (0x01 ) username

Password (0x02) User Password

Vlan id ( 0x03 ) User's inner VLAN ID

When the Type value is 0, it indicates that the TLV ends.

Length is the length of Value, in bytes. The length of Value depends on the value of Type. When Type is user name and user password, the length is 32; when it is VLAN ID, the length is 2. Other reservations. Usernames and user passwords are generally used when authenticating multicast users.

Device 2 (IGMP message parsing device) has the following characteristics:

1. The received IGMP message can be correctly decomposed into the join message and the leave message.

2. If it is a join message, it is judged whether the device functions as a multicast user authentication. If the authentication function is activated, A1, if there is no authentication function, A2;

A1, perform authentication, judge whether it can join, if it is allowed to join Al l , if it is not allowed to join A12.

Al l , determine whether the port of device 2 of the user is already in the forwarding table of the joined group. If not, form a multicast forwarding table. If it is already, record and exit. A12, record and exit.

A2, judge whether it has been joined, if not joined, form a multicast forwarding table; if it has already joined, exit.

3. If the packet is leaving, determine whether the device functions as the multicast user authentication. If the authentication function B1 is activated, the authentication function B2 is not used.

B1, to determine whether the user has joined, if not joined, exit; if joined, determine whether there are other users in the group to leave the same as the port of the device 2 where the user is located, if there is, the record exits; if not, write the group Broadcast the forwarding table, delete this port;

B2, judge whether the user has joined, if not joined, quit; if joined, write the multicast forwarding table, delete this port.

Figure 6A is a flow diagram of an IGMP message transmission method in accordance with the present invention. As shown in FIG. 6A, the IGMP message transmission method of the present invention includes the following steps: Step S602: At least one user terminal sends an IGMP message to an IGMP message forwarding device. Step S604: The IGMP message forwarding device receives and merges at least An IGMP message of the user terminal, and the merged IGMP message is sent to the IGMP message parsing device; and in step 606, the IGMP message parsing device receives and decomposes the merged IGMP message from the IGMP message forwarding device. The decomposed IGMP messages are processed.

As shown in FIG. 6B, step S604 includes: Step S604-2: The IGMP message forwarding device receives an IGMP message from at least one user terminal and/or a message from the IGMP message parsing device and responds; Step S604-4, The IGMP message forwarding device merges the IGMP message when the timer expires and the merged IGMP message does not reach the maximum transmission unit. And the step S604-6, the IGMP message forwarding device arrives or merges at the timer time. If the IGMP message has reached the maximum transmission unit, the checksum of the IGMP message is calculated, and the checksum is inserted into the merged IGMP message and sent to the IGMP message parsing device.

If the timer is not received and the merged IGMP message does not reach the maximum transmission unit, the message merging unit updates the IGMP message of the existing user after receiving the IGMP message from the user. The IGMP packet forwarding device may combine one or more versions of IGMP messages. The above IGMP messages include IGMP join messages and IGMP leave messages.

In step S604-2, if an IGMP join message is received, it is determined whether the user who sent the IGMP join message has been added; if not, the user's egress multicast forwarding table is generated.

In step S604-2, if the IGMP Leave message is received, it is determined whether the user sending the IGMP Leave message is a fast leave; if it is a fast leave, the user information is deleted from the multicast forwarding table, if If you leave slowly, ask the user if you really want to leave.

In step S604-2, when receiving the general query message from the IGMP message parsing device, determining whether the IGMP message forwarding device is an IGMP proxy; if not the IGMP proxy, broadcasting to the at least one user terminal If the IGMP proxy is used, it is determined whether the IGMP packet parsing device functions as the user's authentication function. If the user authentication function is used, the IGMP messages of all users in all groups are merged. If there is no authentication function or the authentication function is in the IGMP packet forwarding device itself, the packets of one user of each group are merged.

In step S606, if the IGMP message is an IGMP join message and the checksum is correct, it is determined whether the IGMP message parsing device functions as a multicast user authentication; if the multicast user authentication function is not activated, the record is logged out; If the user is allowed to join the multicast group, the user is allowed to join the multicast group. If the user is not allowed to join, record and log out. If the user is allowed to join the multicast group, determine whether the port where the user is located is added to the group. The forwarding table of the broadcast group exists; if not, the second forwarding table processing unit is instructed to generate a multicast forwarding table of the user; if yes, the record is recorded and exited.

In step S606, if the IGMP message is an IGMP join message and the checksum is correct, it is determined whether the IGMP message parsing device functions as a multicast user authentication; if it is determined that the multicast user authentication function is not available, You can further determine whether the user has joined the multicast group. If it is not added, it generates a multicast forwarding table. If it has already joined, it exits.

In step S606, if the IGMP message is an IGMP Leave message and the checksum is correct, it is determined whether the IGMP message parsing device functions as a multicast user authentication function; if it is determined that the multicast user authentication function is activated, Determine whether the user has joined the multicast group; if not, quit, if If the user has joined the multicast group, it is determined that the other user in the multicast group to leave is the same as the port of the IGMP packet parsing device where the user is located. If it exists, the record is logged out. If not, the multicast forwarding table is written. Delete the port.

The IGMP packet forwarding device can be located on the user access side, and the IGMP packet parsing device can be located on the user aggregation side.

The IGMP packet forwarding device can be located on the aggregation side of the user, and the IGMP packet parsing device can be located on the broadband remote access server.

The core idea of the present invention is to merge the IGMP messages of the user. Therefore, the device that processes and forwards the IGMP messages can use the present invention.

In order to ensure that the user can receive the data stream directly from the upstream router, the IPTV service flow delay and the switching channel time are guaranteed. The static multicast method is used to establish the service access control point to the multicast source. Transparent channel for multicast data between.

According to the networking diagram shown in Figure 7, both the multicast service control point and the multicast replication point are on the DSLAM.

User aggregation devices include ONUs (Optical Network Units), Layer 2 switching devices, ADSL MODEMs, etc. in EPON systems that can run IGMP protocols.

The three video terminals 702, 704, and 706 have MAC addresses of MAC 1, MAC2, and MAC3, respectively, and IP addresses are IP1, IP2, and IP3, which are connected to ports 1, 2, and 3 of the user aggregation device; and 4 in the network. Multicast channels, respectively G1, G2, G3, G4; video terminal users can join different channels.

On the user aggregation device, the timer for sending multi-user IGMP join and leave messages is set. The period of the timer can be set according to the actual situation of the network. The default is 20MS.

The video terminal 702 sends an IGMP REPORTC IGMP request to join, Ϋλ IGMPV2 as an example, requests to join the group 1, and the user aggregation device receives the join message, and organizes the IGMP new ^=艮 type according to the format of FIG. 4 and FIG. 5: 0Xef . The user records that Host Records is 1, the user's IP address, and the MAC address is taken from the message. If the timing is up, the checksum of the new message is calculated, and the new IGMP message is sent to the upper layer device, such as; DSLAM; if the timing period is not reached, the second The video terminal 704 requests to join the group 2, merges the information of the terminal 704 into the new IGMP, and the user records the Host Records plus 1 to 2, the same IP2, and the MAC2 is taken from the message. If the timer expires, the checksum is calculated, and the message recording the two user information is sent to the upper device. The third video terminal switches from channel 3 to channel 4. The entire organization of the message is as shown in Figs. 8A to 8C.

The upper device receives an IGMP packet of the type OXef:

Step 1: Verify that the IGMP message is checked and is in error. If it is wrong, discard it. If it is correct, go to step 2;

Step 2: Parse out four IGMP messages and retrieve each user information. Differentiate what type of packet is. If it is a join message, go to step 3. If it is a leave message, go to step 4. Step 3: Check whether the first user information IP1 and MAC1 can be added to G1 for authentication. If you are allowed to join, you will exit; if you are allowed to join, go to step 31;

Step 31: Determine whether IP1 and MAC1 are added to G1 for the first time. If it is the first time to join, add this item to the forwarding table of multicast G1, and notify the access control that the join is successful. If it is not the first time to join, quit.

Step 4: Determine whether IP3 and MAC3 have been added to G3. If they are not added, exit. If they have joined, judge whether to leave quickly. If they leave quickly, delete from the forwarding table and notify access control.

Figure 9 shows the situation where both the multicast service control point and the multicast replication point are on the BRAS.

The following describes the situation where the IGMP packets are supported and not supported on the user aggregation device. The user aggregation device supports the processing of the merged IGMP messages. The user aggregation device combines the user packets and sends them to the DSLAM. The DSLAM is decomposed to form a Layer 2 forwarding table. On the other hand, the merged IGMP messages can be merged again. Sent to the BRAS. That is, as long as the timing has not arrived and the MTU has not been reached, the merge can continue to form a new packet of type Oxef.

The user aggregation device receives the general query message and merges the user's join message according to the actual online situation of the user. For example, user 1, user 2, and user 3, respectively, Gl, G2, and G4, and only one IGMP message is sent after the combination.

User aggregation device does not support the processing of IGMP messages. User aggregation device forwarding. The user's IGMP message is sent to the DSLAM. The DSLAM merges the user's join and leave the message, and a new type of Oxef packet is sent to the BRAS.

The user aggregation device receives the general query message and sends the user's join message according to the actual online situation of the user. For example, user 1, user 2, and user 3 are in Gl, G2, and G4, and need to send three IGMP join messages.

The BRAS receives the IGMP message of the type Oxef. After the packet is checked, the packet is decomposed. If the user joins the packet, the user information is authenticated. After the authentication is passed, the forwarding table is formed. The multicast group is sent to the DSLAM. If the authentication does not pass, discard.

Figure 10 shows the multicast service control point in the BRAS and the multicast replication point on the DSLAM. The IGMP join and leave message is merged on the DSLAM, but the forwarding table is not formed. The merged multi-user IGMP message is sent to the BRAS. The port information of the DSLAM where the user is located needs to be carried in the merge for authentication. . After the BRAS receives the test, it is decomposed and judged. If the user joins the message, the user information is authenticated. After the authentication is passed, the DSLAM is notified to form a corresponding forwarding table. If the authentication does not pass, discard it. If the packet is leaving, determine whether the user exists in the corresponding group. If it does not exist, discard it; if it exists, notify the DSLAM to delete it from the corresponding forwarding table.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial Applicability According to the technical solution provided by the present invention, when there are many users, especially when receiving general query messages, there are many IGMP messages on the network. When the method of combining user IGMP messages is used, the traffic of IGMP messages on the network is reduced, that is, the time for processing IGMP messages by the multicast device is reduced, and the corresponding processing capacity is unchanged. Increase the access of multicast users.

Claims

Claim

An IGMP packet transmission method, the method includes the following steps: Step S602: At least one user terminal sends an IGMP message to an IGMP packet forwarding device.

Step S604, the IGMP4 message forwarding device receives and merges the IGMP message from the at least one user terminal, and sends the merged IGMP message to the IGMP message parsing device;

The method of transmitting an IGMP message according to claim 1, wherein the step S604 comprises:

Step S604-2, the IGMP message forwarding device receives an IGMP message from the at least one user terminal and/or a message from the IGMP message parsing device and responds;

Step S604-4, the IGMP message forwarding device merges the IGMP message when the timer has not expired and the merged IGMP message does not reach the maximum transmission unit;

The method for transmitting an IGMP message according to claim 2, wherein in the step S604-4, if the timer timing is not reached and the merged IGMP 4 message does not reach the maximum transmission unit, After the IGMP ^J1 forwarding device receives the IGMP message of the user, the IGMP message of the existing user is updated.

The method for transmitting an IGMP message according to claim 3, wherein the IGMP message includes an IGMP join message and an IGMP leave message, and the IGMP message forwarding device combines one or more types. Version of IGMP 4 text.

The method for transmitting an IGMP message according to claim 4, wherein in step S604-2: When the IGMP join message is received, it is determined whether the user who sent the IGMP join message has been added, and if not, the egress multicast forwarding table of the user is generated, and if it is added, the record is recorded and exited; as well as

The method for transmitting an IGMP message according to claim 4, wherein the step S604-2 comprises:

When receiving the general query message from the IGMP message parsing device, determining whether the IGMP message forwarding device is an IGMP proxy; if not the IGMP proxy, broadcasting to the at least one user terminal a general query message; if the IGMP proxy is activated, determining whether the IGMP packet parsing device has authenticated the user; if the authentication function of the user is activated, all groups are merged The IGMP message of all users, if there is no authentication function or the authentication function is in the IGMP message forwarding device itself, merges the messages of one user of each group.

The method for transmitting an IGMP message according to claim 4, wherein in step S606:

When the IGMP message is an IGMP join message and the checksum is correct, it is determined whether the IGMP message parsing device functions as a multicast user authentication; when it is determined that the multicast user authentication function is If the user is allowed to join, the user is allowed to join the multicast group. If the user is allowed to join, the user is allowed to join the network. Then, the multicast forwarding table of the user is generated, and if it exists, the record is recorded and exited.

If the IGMP message is an IGMP join message and the checksum is correct, determining whether the IGMP message parsing device functions as a multicast user authentication; and determining that the multicast user authentication function is not In the case, it is determined whether the user has joined the multicast group; If it is entered, a multicast forwarding table is generated. If it has been added, it exits.

If the IGMP message is an IGMP Leave message and the checksum is correct, determining whether the IGMP message parsing device functions as a multicast user authentication; and determining that the multicast user authentication function is If the user has joined the multicast group, if the user has joined the multicast group, it is determined whether the other user and the user are in the IGMP message. The port of the parsing device is the same; if it exists, it records and exits. If it does not exist, the multicast forwarding table is written and the port is deleted.

The method for transmitting an IGMP message according to any one of claims 1 to 9, wherein:

The IGMP packet forwarding device is located at the user access side, and the IGMP packet parsing device is located at the user aggregation side; or

11. An IGMP message transmission system, comprising:

At least one user terminal, configured to send an IGMP message to the IGMP packet forwarding device;

An IGMP message forwarding device, configured to receive and merge an IGMP message from the at least one user terminal, and send the merged IGMP message to the IGMP message parsing device;

The IGMP message parsing device is configured to receive and decompose the merged IGMP message from the IGMP message forwarding device, and process the decomposed IGMP message.

The IGMP message transmission system according to claim 11, wherein the IGMP message forwarding device comprises:

The timer is used to control the time when IGMP messages are sent periodically.

a message merging unit, configured to merge received IGMP messages, and at a timer time If the IGMP message has reached the maximum transmission unit, the merged IGMP message is sent to the IGMP4 message parsing device;

The verification and calculation unit calculates the checksum of the IGMP message by using the IGMP message after the timer has expired or the merged IGMP message has reached the maximum transmission unit, and inserts the checksum into the merged IGMP message. .

The IGMP message transmission system according to claim 12, wherein the message merging unit receives the IGMP message after the timer has not expired and the merged IGMP message does not reach the maximum transmission unit. Updates the existing IGMP messages of the user after the user's IGMP suffix.

The IGMP message transmission system according to claim 12, wherein the message merging unit can combine one or more versions of IGMP messages; the IGMP messages include IGMP join messages and IGMP. Leave the text.

The IGMP packet transmission system according to claim 12, wherein, when receiving the IGMP join message, the message receiving unit determines whether the user who sent the IGMP join message has joined, if not If yes, the user sends the outgoing multicast forwarding table of the user. If the IGMP Leave message is received, the user who sends the IGMP Leave message is sent out quickly. If yes, the user's information is deleted from the multicast forwarding table. If it is slow to leave, the indication is asked to the user if they really left.

The IGMP message transmission system according to claim 12, wherein the message receiving unit determines whether the IGMP message forwarding device is in the case of receiving the general query message from the IGMP message analyzing device. The IGMP proxy, if not, broadcasts the received general query message to at least one user terminal; if the IGMP proxy is activated, determines whether the IGMP message parsing device functions as the user's authentication function. Then, the message merging unit merges the IGMP messages of all the users in the group. If the authentication function or the authentication function is not in the IGMP packet forwarding device itself, the message merging unit is instructed to merge the packets of one user in each group.

The IGMP message transmission system according to claim 11, wherein the IGMP message parsing apparatus comprises: The inspection and verification unit is configured to check whether the checksum in the received IGMP message is correct; the message parsing unit is configured to parse and process the received IGMP message in the case of verification and correctness;

The IGMP packet transmission system according to claim 17, wherein the join message processing unit determines whether the IGMP message parsing device functions as a multicast user authentication when the check and the correct one is correct; If the multicast user authentication function is enabled, the user can join the multicast group. If the user is not allowed to join, record and log out. If the user is allowed to join, determine whether the port where the user is located is the forwarding table of the multicast group. If it does not exist, the user's multicast forwarding table is generated. If it exists, it records and exits. If it is determined that there is no multicast user authentication function, it is determined whether the user has joined the multicast group. , then generate a multicast forwarding table, and if it has already joined, exit.

The IGMP packet transmission system according to claim 17, wherein the leaving message processing unit determines whether the IGMP message parsing device functions as a multicast user authentication when the check and the correct one is determined; If the multicast user authentication function is used, the user is determined to have joined the multicast group. If not, the user will join the multicast group. If the user has joined the multicast group, determine whether there are other users and the user's IGMP. The port of the packet parsing device is the same. If it exists, it records and exits. If it does not exist, it writes the multicast forwarding table and deletes the port.

20. The IGMP message transmission system according to claim 11, wherein:

The IGMP message forwarding device is located at the user access side, and the IGMP message parsing device is located at the user aggregation side;

The IGMP message forwarding device is located at the user aggregation side, and the IGMP message parsing device is located at the broadband remote access server side.