WO2008138248A1

WO2008138248A1 - A method, an interface board and a router for transmitting the message

Info

Publication number: WO2008138248A1
Application number: PCT/CN2008/070806
Authority: WO
Inventors: Haifeng Zhang; Yisong Liu; Xiaoniu Zhou; Songming Cheng
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-05-14
Filing date: 2008-04-25
Publication date: 2008-11-20
Also published as: CN101052006A; CN101052006B

Abstract

A method for transmitting the message, an interface board and a router for realizing the method improve the speed of the router to process the message. The method for transmitting the message is that: the interface board receives a state change message of the multicast group transmitted by the first host; the interface board transmits a query message to the second host; if not receiving the multicast group state message which is feedback by the second host during the determined period, the interface board updates the state of the multicast group according to the state change message of the multicast group and transmits a preset number of the state change message of the multicast group to the main control board. The speed of the router to process the message transmitted by the host in the network is efficiently increased.

Description

Message transmission method, interface board and router

This application claims priority to Chinese Patent Application No. 200710102080.1, entitled "Method for Sending Messages and Interface Board and Router for Implementing the Method", which was filed on May 14, 2007. The content is incorporated herein by reference.

Technical field

The present invention relates to the field of communications, and in particular, to a packet transmission method, an interface board, and a router. Background technique

The architecture of routers is mostly distributed. In a distributed routing environment, the control plane implements the processing of the protocol, and the data plane implements the forwarding of the packet. Generally, the unit responsible for the control plane is called the main control board, and the unit responsible for the data plane is called the interface board. A distributed router generally has a main control board and multiple interface boards. After receiving the protocol text from the physical interface, the interface board sends the protocol packet to the main control board through the bus between the boards.

IP multicast is a subset of a given node in the network that transmits packets to the network in a best-effort manner. This subset is called a multicast group. The basic idea of IP multicast is that the source host sends only one data. The destination address in this data is the multicast group address. All receivers in the multicast group can receive the same data copy, and only multicast. Hosts in the group can receive this data, and other hosts on the network cannot receive it.

The Internet Group Management Protocol (IGMP) is a protocol used by the IPv4 domain to implement hosts to join a specific multicast group. There are three versions, IGMPvl/v2/v3. In the vl version, the host sends a report to the neighboring router to join a specific multicast group. After the router receives the packet, it sets the multicast group timer and creates a corresponding multicast group to guide the forwarding. The router periodically sends the general Query message to the host to determine whether there is a multicast group on each interface. After receiving the common query message, the host adds the host to the multicast group to Report. The packet is sent to the neighboring router. After receiving the Report message of the existing multicast group, the router updates the multicast group timer. If the Report message of a certain group is not received within a period of time, the multicast is displayed. The group timer expired and the status of this group has been deleted.

In IGMPv2, the sending of Leave packets is added based on vl. If the host leaves a multicast group, it sends a Leave message to the neighboring router. After receiving the router, immediately send a group-Query Query message to determine if there are other hosts under this interface that you want to continue. After receiving the data of this multicast group, all hosts that have not left this group resend the Report message to indicate the existence of the host.

In IGMPv3, the source filtering mechanism is added on the basis of v2. The host sends a Report message to indicate that the host only wants to receive data from certain specific sources, or data from other sources except for some specific sources. Both can be received, corresponding to two states: INCLUDE (A) (indicating that other sources outside the A set are not received) and EXCLUDE (B) (representing data from other sources outside the B set are acceptable); After querying the message, respond to the IS-IN or IS-EX type Report message according to the status of each group. If the source that the host can receive increases or decreases, the active send type is ALLOW (increase) to BLOCK (decrease). Type Report message. A packet that causes the status of the multicast group to change is called a status change message.

In the prior art, for the IGMP/MLD (Multicast Listener Discovery) text, the status of the multicast group sent by each host is changed to the main control board through the interface board and bus connected to the host. The query message sent by the main control board to each host is sent to each host connected to the interface board through the bus. In the case that a large number of IGMP/MLD hosts exist, every tens of seconds, the router sends a query message sent by the router. Each host on the network responds to the main control board with a current interface board. The multicast group status file is transmitted from the interface board to the main control board through the bus; thus, the bus channel between the main control board and the interface board is determined by the bandwidth. When there are many packets to be transmitted, it may cause Blocking, causing bottlenecks in protocol packet processing. That is, the main control board needs to process the packets received by multiple interface boards in the router. When a large number of packets are uploaded on the network, the main control board cannot process a large number of packets in a short period of time, resulting in a group of hosts. The broadcast group status packet is discarded, and the host in the network cannot get the response of the router in time, which causes the tasks of the entire network to lag, and the data exchange in the network is not smooth.

Summary of the invention

The present invention provides a packet transmission method, an interface board and a router for implementing the method, so as to improve the efficiency of processing a message by a router.

To this end, the present invention provides a method for message transmission, including:

The interface board receives the multicast group status change message sent by the first host; the interface board sends the query message to the second host; if the interface board does not receive the multicast group status message fed back by the second host within the specified time, Updating the multicast group status according to the multicast group status change message, and sending the preset number to the main control board The multicast group status change message.

The present invention further provides a method for transmitting a message, where the message is a join message, the method includes: receiving, by the interface board, a join message sent by the first host; When the host sends the multicast group recorded in the join message, the interface board adds the multicast group recorded in the join message, and sends a preset number of the join message to the main control board.

The invention also provides an interface board, comprising:

The first packet receiving unit is configured to receive a multicast group status change message sent by the first host, and the query message sending unit is configured to receive the multicast group status change report in the first packet receiving unit. After the message is sent, the Query message is sent to the second host, where the update unit is configured to receive the multicast group state change message fed back by the second host within the specified time, according to the received by the first message receiving unit. The multicast group status change message is used to update the multicast group status stored in the interface board, and the sending unit is configured to: after the first packet receiving unit receives the multicast group status change message, and is within a specified time When the multicast group state change packet is not received by the second host, the preset number of the multicast group state change packet received by the first packet receiving unit is sent to the main control board.

The present invention further provides another interface board, including: a first packet receiving unit, configured to receive a join message sent by the first host; a storage unit, configured to store a multicast group list; and an adding unit, configured to When the multicast group recorded in the join message received by the first packet receiving unit is not stored in the storage unit, the multicast group recorded in the join message is added, and the sending unit is configured to send the first report. The join message received by the text receiving unit is sent to the main control board.

The present invention further provides a router, including: an interface board, configured to: receive a packet sent by a host, and send an inquiry message to the host; if the multicast group status message sent by the host is not received within a specified time, And updating the multicast group status according to the packet sent by the host, and sending a preset number of the packets sent by the host; the main control board, configured to receive the preset number of the sent by the interface board The packet sent by the host updates the state of the multicast group according to the preset number of packets sent by the host.

The above technical solution shows that, after receiving the multicast group state change message, the interface board sends an Query message to the second host in the network to query the current multicast group status of the second host in the network. After receiving the multicast group status packet sent by the second host, the board resets the multicast group timer. When the board receives the multicast group status packet sent by the second host in the network, it sends the packet to the main control board. The preset number of multicast group status changes packets; so the router interface board processes the packets received by itself, which will be required. The packet processed by the main control board is processed by the interface board that receives the packet, which reduces the data traffic of the bus between the interface board and the main control board, and prevents data congestion on the bus between the interface board and the main control board. Speed up the speed at which the router processes the packets sent by the host in the network.

DRAWINGS

1 is a schematic diagram of a method for transmitting a message according to an embodiment of the present invention;

2 is a schematic diagram of a method for transmitting a multicast group source state change message according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a method for joining a message transmission according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a method for leaving a message transmission according to an embodiment of the present invention; FIG.

FIG. 5 is a structural diagram of an interface board according to an embodiment of the present invention;

FIG. 6 is a structural diagram of a router according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1 for a flowchart of a method for transmitting a message provided by the present invention.

The message transmission in the embodiment of the present invention can be understood as that after receiving the packet sent by the host in the network, the router interface board sends the packet to the main control board of the router after corresponding processing. The method includes the steps of:

The interface board receives the multicast group status change message sent by the first host.

For convenience of description, the embodiment of the present invention defines: The first host is a host in the network that sends a multicast group status change message to the router.

52) The interface board sends a query message to the second host;

For convenience of description, the embodiment of the present invention defines: The second host is a host in the network that does not send a multicast group state change message to the interface. The interface board sends a query message to the second host to query whether the second host that does not send the multicast group status change packet in the network also needs to change the status of the multicast group. If the interface board receives the second host within the specified time. If the current multicast group status message is fed back, the process proceeds to step S3). If the interface board does not receive the current multicast group status message fed back by the second host in the network within the specified time, step S4) is performed.

S3) The multicast group timer is reset to zero. The multicast group timer can also be reset. The following types are similar and will not be described again.

If the interface board receives the current multicast group status message fed back by the second host within the specified time, the multicast group timer is reset to zero. The following steps are not performed and the process ends. a list of multicast groups stored in the router, The router updates the status of each multicast group in the list within the timer time. After the multicast group list is updated, the multicast group timer is reset to zero and the timer is restarted.

When the interface board receives the multicast group state change packet sent by the first host, the interface board sends a number of last member query packets to the second host to query the first packet of the multicast group state change packet. Whether the host is the last host in the multicast group; the interface board sends a number of last member query messages in a certain interval. The interval is called the last member query interval. The interface board sends several last member query reports. The number of times is called the last member query count. The specified time in the current multicast group status message that the interface board receives the feedback from the host within the specified time is: the value obtained by multiplying the last member query interval by the last member query number. If the current multicast group status packet sent by the second host is received, the last member query packet is not sent.

54) The interface board updates the multicast group status according to the multicast group status change message;

When the interface board does not receive the current multicast group status message fed back by the host within the specified time, the interface board updates the multicast group status according to the multicast group status change message, and executes S5).

The specified time is not specified in the current multicast group status message fed back by the host within the specified time. The specified time is: the value obtained by multiplying the last member query interval by the last member query.

55) The interface board sends a preset number of multicast group state change packets to the main control board;

After the interface board receives the multicast group status change packet sent by the first host in the network, if the multicast group status change packet causes the current status of the multicast group to change, the interface board sends the multicast group sent by the first host. One or several of the changed messages are sent to the main control board.

The preset number of multicast group change packets is set in the interface board. The number of multicast group status change packets sent by the interface board to the main control board can be set to 1, 2, 3, and so on. Preferably, the preset number of the embodiment of the present invention is 1 or 2. Set the number of presets so that the number of packets that the interface board reports to the main control board is much smaller than the number of packets received by the interface board. This reduces the work of the main control board and speeds up the processing of packets.

S6) The main control board updates the multicast group status according to the multicast group status message.

In the embodiment of the present invention, the multicast group timer in the main control board is not timed out. After receiving the multicast group status change packet, the main control board directly modifies the multicast group status stored by the multicast group according to the multicast group status change message. The present invention provides an embodiment of message delivery for different content in accordance with the above-described message delivery general method map.

The following describes how to change the packet according to the status of different multicast groups, and describe the processing steps after the interface board receives the packet and the processing steps of the main control board.

2 is a flow chart of a method for transmitting a multicast group source state change message according to an embodiment of the present invention, where the method includes the following steps:

A1) The interface board receives the multicast group source state change packet sent by the first host.

In the network where the router exists, in the embodiment of the present invention, the first host is a host in the network that sends a multicast group state change message to the router.

A2) The interface board sends a group source query message to the second host.

In the embodiment of the present invention, the second host in the network is a host in the network that does not send a multicast group source state change message to the interface. The interface board sends a group source query message to the second host in the network to query whether the host that does not send the group source query message on the network also needs to change the source state of the multicast group. The interface board receives the feedback from the host within the specified time. Step A3) is performed when the current multicast group source status message is received. If the interface board does not receive the current multicast group source status message fed back by the second host in the network within the specified time, step A4) is performed. The specified time is specifically as follows: The value obtained by multiplying the last member query interval by the last member query count.

A3) The multicast group timer is reset to zero;

The interface board resets the multicast group timer to zero. It should be noted that, if the multicast group timer expires, the interface board deletes the multicast group; the interface board sends the leave message to the main control board, and the main control board deletes the leave message after receiving the leave message sent by the interface board. The multicast group recorded in .

A4) The interface modifies the multicast group source state according to the multicast group source state change packet, which includes the following situations, but is not limited thereto:

Scenario 1: Assuming that the current group status is INCLUDE (A), the interface board receives the multicast group status change message transmitted by the first host in the network as a TO_IN (B) message (the TOJN (B) message indicates the source of the group. The list is changed to B set), then the interface board changes the source state of the group to INCLUDE ( B ).

Scenario 2: Assuming that the current group's state is INCLUDE(A) and the interface board receives the TO_EX (B) message transmitted by the first host in the network, the interface board changes the source state of the group to EXCLUDE ( NULL, B ). EXCLUDE ( NULL, B ) indicates that sources other than the B set are receivable. Scenario 3: Assuming that the current group's state is INCLUDE(A) and the interface board receives the ALLOW (B) message from the first host in the network, the interface board changes the source state of the group to INCLUDE (A+B).

Scenario 4: Assuming that the current group's state is INCLUDE(A) and the interface board receives the BLOCK (B) message from the first host in the network, the interface board changes the source state of the group to INCLUDE (A-B).

Scenario 5: Assuming that the current group's state is EXCLUDE (X, Y) and the interface board receives the first host TO-IN (A) message in the network, the interface board modifies the source state of the group to INCLUDE ( A ).

Scenario 6: Assuming that the current group's state is EXCLUDE (X, Y), the interface board receives the first host TO_EX (A) message in the network, the interface board changes the source state of the group to EXCLUDE ( NULL, A ) .

Scenario 7: Assuming that the current group's status is EXCLUDE (X, Y) and the interface board receives the first host ALLOW (A) message in the network, the interface board changes the source state of the group to EXCLUDE (X+A, YA). .

Scenario 8: Assuming that the current group status is EXCLUDE (X, Y) and the interface board receives the first host BLOCK (A) message in the network, the interface board changes the source state of the group to EXCLUDE (XA, Y+A). .

A5) The interface board sends a preset number of multicast group source state change packets to the main control board.

The preset number of multicast group change packets is the number of multicast group source state change packets sent to the main control board preset in the interface board. It can be set to 1, 2, 3, and so on. Those skilled in the art can set according to the current network conditions and the workingability of the router; the preferred number of presets in the embodiment of the present invention is 1 or 2. Set the number of presets so that the number of packets sent by the interface board to the main control board is much smaller than the number of packets received by the interface board. This reduces the work of the main control board and speeds up the processing of packets.

A6) The main control board modifies the source status of the multicast group stored on the main control board according to the multicast group source status message. After receiving the multicast group source status change packet, the main control board modifies the information according to the multicast group status change. Status of the multicast group stored on the main control board.

The group timer set on the main control board does not time out.

After the main control board receives the multicast group source status (Report) packet from the interface board, the status of the multicast group changes as follows:

Case 1: Assuming that the current group's state is INCLUDE (A), it receives the TO-IN transmitted by the interface board. (B) Message, then the state of the group is changed to INCLUDE (B).

Case 2: g殳 The current group status is INCLUDE(A). When the TO-EX (B) message transmitted by the interface board is received, the status of the group changes to EXCLUDE ( NULL, B ). ( EXCLUDE ( NULL, B ) means that all sources except the B set can be received)

Scenario 3: Assume that the current group's state is INCLUDE(A) and receives the ALLOW transmitted by the interface board.

(B) Message, then the state of the group changes to INCLUDE (A+B).

Case 4: g殳 The current group status is INCLUDE(A). When the BLOCK (B) message transmitted by the interface board is received, the status of the group changes to INCLUDE (A-B).

Scenario 5: Assuming that the current group's state is EXCLUDE (X, Y), the TO_IN (A) message transmitted by the interface board is received, and the state of the group is changed to INCLUDE (A).

Case 6: Assuming that the current group's state is EXCLUDE (X, Y), the TO E (A) message transmitted by the interface board is received, and the state of the group is changed to EXCLUDE ( NULL, A ).

Case 7: Assuming that the current group's state is EXCLUDE (X, Y), the ALLOW (A) message transmitted by the interface board is received, and the state of the group is changed to EXCLUDE (X+A, Y-A).

Scenario 8: Assume that the current group's state is EXCLUDE (X, Y), received by the interface board.

In the BLOCK (A) message, the state of the group is changed to EXCLUDE (X-A, Y+A).

At this point, the router ends the processing of the packet sent by the network that causes the state of the multicast group source to change.

FIG. 3 is a schematic diagram of an embodiment of join message transmission according to an embodiment of the present invention.

B 1) The interface board receives the join message sent by the first host;

For convenience of description, the embodiment of the present invention defines: The first host is a host in the network that sends a join message to the router.

When the multicast group recorded in the join message sent by the first host is stored in the interface board, step B2) is performed; when the multicast group recorded in the join message sent by the first host is not stored in the interface board, Perform step B3).

B2) The interface board resets the multicast group timer to zero and adds the first host to the multicast group. The interface board resets the multicast group timer to zero and adds the first host to the multicast recorded in the join message. In the group, the following steps are no longer performed and the current process ends.

It should be noted that if the multicast group timer expires, the interface board deletes the multicast group and sends the multicast group to the main control board. Sending a Leave message, the main control board deletes the multicast group recorded in the Leave message.

The router lists the multicast group list stored in the router. The router updates the status of each multicast group in the list within the timer time. After the multicast group list is updated, the multicast group timer is reset to zero and the timer is restarted.

B3) The interface board adds the multicast group, and sends a preset number of join messages to the main control board; the preset number of join messages is the number of join messages sent to the main control board preset in the interface board. , can be set to 1, 2, 3, etc. Those skilled in the art can set according to the current network conditions and the operability of the router. The preferred number of presets in the embodiment of the present invention is 1 or 2. Set the number of presets so that the number of packets sent by the interface board to the main control board is much smaller than the number of packets received by the interface board. This reduces the work of the main control board and speeds up the processing of packets. The interface board sends the join message sent by the first host in the network to the main control board in the form of a report message. Add the multicast group recorded in the join message to the interface board, and go to step B4).

B4) The main control board adds the multicast group recorded in the join message;

The main control board stores the multicast groups recorded in the join message.

FIG. 4 is a schematic diagram of an embodiment of leaving message transmission according to an embodiment of the present invention.

C 1) The interface board receives the leaving message sent by the first host;

For convenience of description, the embodiment of the present invention defines: The first host is a host that sends a leaving message to the router interface board.

C2) The interface board sends a group query message to the second host;

For convenience of description, the embodiment of the present invention defines: The second host is a host in the network that does not send a leaving message to the router.

The group query message is sent by the router to the host to query whether the host wants to quit the multicast group recorded in the leave message. When the interface board receives the join message sent by the second host in the network within the specified time, the interface board performs step C3). When the interface board does not receive the join message sent by the second host in the network within the specified time, the interface board performs step C4. . The specified time is specifically: The value obtained by multiplying the last member query interval by the last member query count.

It should be noted that, if the multicast group timer expires, the interface board deletes the multicast group; the interface board sends a leave message to the main control board, and the main control board deletes the multicast group recorded in the leave message. .

C3) discards the leaving message and resets the multicast group timer to zero;

If the Leave message sent by the host is discarded, the interface board does not modify the stored multicast group. Storing in the router After storing the multicast group list, the router updates the status of each multicast group in the list within the timer time. After the multicast group list is updated, the multicast group timer is reset to zero and the timer is restarted.

C4) The interface board deletes the multicast group recorded in the leaving message;

The interface board deletes the records of the multicast group recorded in the leaving packet stored in the interface.

C5) The interface board sends a preset number of leaving messages to the master control;

The preset number of leaving packets is the number of outgoing packets sent to the main control board, which are preset in the interface board, and can be set to 1, 2, 3, and so on. Those skilled in the art can set according to the current network conditions and the operability of the router. The preferred number of presets in the embodiment of the present invention is 1 or 2. Set the number of presets so that the number of packets sent by the interface board to the main control board is much smaller than the number of packets received by the interface board. This reduces the work of the main control board and speeds up the processing of packets.

The interface board sends the Leave message sent by the host to the main control board in the form of a leave message.

C6) The main control board deletes the multicast group recorded in the leaving message;

After receiving the Leave message, the MPU deletes the record of the multicast group recorded in the Leave message stored by itself.

FIG. 5 is a structural diagram of an interface board according to an embodiment of the present invention.

If the multicast group status change packet sent by the interface board is a multicast group source status change packet, the interface board includes:

The first packet receiving unit 110 is configured to receive a multicast group state change packet sent by the first host, and the query packet sending unit 120 is configured to receive the multicast group state in the first packet receiving unit. After the packet is changed, the query message is sent to the second host.

The updating unit 130 is configured to: in the interface board, change the multicast group status change message that is not received by the second host, and update the interface board according to the multicast group status change message received by the first message receiving unit. The stored multicast group status;

The sending unit 140 is configured to: after the first packet receiving unit receives the multicast group state change message, and does not receive the multicast group state change message fed back by the second host within a predetermined time, The number of the multicast group state change packets is sent to the main control board.

After the second host receives the Query message sent by the interface board, and sends the multicast group status message to the interface board, the interface board further includes: a second packet receiving unit 150, configured to perform the query After the packet sending unit sends the query message to the second host, it receives the multicast group status report fed back by the second host. Text

The timer processing unit 160 is configured to reset the multicast group timer when the second packet receiving unit receives the multicast group status message fed back by the second host in the network within a predetermined time.

If the multicast group status change packet sent by the first host to the interface board is a join message, the interface board is configured as follows:

The first packet receiving unit 110 is configured to receive a join message sent by the first host.

The storage unit 170 is configured to store a multicast group list.

The adding unit 180 is configured to: when the storage unit does not store the multicast group recorded in the join message received by the first packet receiving unit, add the multicast group recorded in the join message;

The sending unit 140 is configured to send the join message received by the first packet receiving unit to the main control board.

The interface board further includes a timer processing unit 160, which is different from the multicast group list stored by the interface board storage unit;

The timer processing unit 160 is configured to: when the storage unit stores the multicast group recorded in the join message received by the first packet receiving unit, reset the multicast group timer;

The adding unit 180 is further configured to add the first host to the multicast group of the added text record received by the first receiving unit.

The above describes the internal structure of the interface board according to the difference of the transmitted packets. However, the interface board can transmit the multicast source state change packets, join the packet, and leave the packet. Therefore, the interface board is different according to the different description of the packet. Structures exist in an interface board.

In order to fully implement the method embodiment of the present invention, the embodiment of the present invention further provides a structural diagram of a router. FIG. 6 is a structural diagram of a router according to an embodiment of the present invention.

As shown, the router includes:

The interface board 100 is configured to: receive a packet sent by the host, and send a query message to the host; if the multicast group status message sent by the host is not received within the specified time, the packet is sent according to the host Updating the multicast group status, and sending a preset number of packets sent by the host;

Preferably, the interface board includes: a first message receiving unit, a query message sending unit, an updating unit, and a sending unit, and functions and functions of the respective units are as described above, and details are not described herein again.

The main control board 200 is configured to receive the preset number of packets sent by the interface board, and according to the The preset number of messages sent by the host updates the state of the multicast group.

The main control board includes: a first message receiving unit, a storage unit, an adding unit, and a sending unit, and functions and functions of the respective units are as described above, and are not described herein.

Due to the different situations in the network, the function of the router interface board is refined. When the interface board 100 receives the multicast group status message sent by the host within the specified time, the multicast group timer is reset.

It should be noted that, in a normal case, multiple interface boards exist in one router device, and one main control board exists in one router device; each interface board is connected to the main control board.

As shown in the above technical solution, the embodiment of the present invention separately describes the processing of the multicast group source state change packet and the leaving packet interface board, and the processing of the main control board and the main control board; the specific message transmission process is convenient to implement. .

Further, in the embodiment of the present invention, after the interface board receives the join message, if the interface board itself stores the multicast group recorded in the join message, the interface board only updates its own state, and no interface is added to the interface board. The multicast group recorded in the packet sends the preset number of join messages to the main control board. The number of packets sent between the interface board and the main control board is reduced, and the data traffic on the bus is reduced.

Further, in the embodiment of the present invention, if the multicast group timer expires, the interface board deletes the multicast group, and then sends the leaving packet of the multicast group to the main control board to reduce the processing of the main control board. The amount of work.

The above description of the method for transmitting a message, an interface board and a router provided by the present invention is only for helping to understand the method of the present invention and its core idea; meanwhile, it is for those skilled in the art. The present invention is not limited by the scope of the present invention.

Claims

Rights request

A method for transmitting a message, comprising:

The interface board receives the multicast group status change packet sent by the first host.

The interface board sends a query message to the second host.

If the interface board does not receive the multicast group status message fed back by the second host within the specified time, the interface changes the state of the multicast group according to the status of the multicast group, and sends the preset to the main control board. The number of the multicast group status change messages.

The method of transmitting a message according to claim 1, wherein the method further comprises:

If the interface board receives the multicast group status packet fed back by the second host within the specified time, the multicast group timer is reset.

The method for transmitting a message according to claim 1, wherein the method further comprises:

The main control board updates the state of the multicast group stored by the main control board according to the received preset number of multicast group status change messages.

4. The method of message transmission according to claim 3, characterized in that

The multicast group status change message is: a multicast group source status message; the query message is: group source query 4艮文;

The preset number of the multicast group state change packet is: a multicast group source state change packet.

The packet transmission method according to claim 3, wherein the multicast group status change message is: leaving a message,

The query ^艮文 is: group query text;

When the multicast group status message is a join message, the interface board discards the leave message and resets the multicast group timer.

The interface board updates the multicast group status according to the multicast group status change message to: delete the multicast group recorded in the leave message, and send a preset number of the multicast to the main control board. The group status change message is a leave message;

The main control board updates the state of the multicast group stored on the main control board according to the preset number of multicast group state change packets: The main control board deletes the multicast group recorded in the leaving message according to the preset number.

The method for transmitting a message according to claim 4 or 5, wherein, if the multicast group timer is exceeded, the interface board deletes the multicast group, and sends a leave message to the main control board. The main control board deletes the multicast group recorded in the leaving message.

A method for transmitting a message, wherein the packet is a join message, and the method includes: receiving, by the interface board, a join message sent by the first host;

When the multicast group recorded in the join message sent by the first host is not stored in the interface board, the interface board adds the multicast group recorded in the join message, and sends the preset number to the main control board. The join message.

The packet transmission method according to claim 7, wherein when the interface board stores the multicast group in the join message sent by the first host, the interface board performs the multicast The group timer is reset, and the first host is added to the multicast group of the join message record.

The method for transmitting a message according to claim 8, wherein the method further comprises:

The main control board adds the multicast group recorded in the join message according to the preset number of join messages received.

The method of transmitting a message according to claim 9, wherein the method further comprises:

If the multicast group timer expires, the interface board deletes the multicast group, and sends a message to the main control board.

The main control board deletes the multicast group recorded in the leaving message.

11. An interface board, comprising:

The first packet receiving unit is configured to receive a multicast group state change packet sent by the first host, and the query packet sending unit is configured to receive the multicast group state change report in the first packet receiving unit. After the text, the query message is sent to the second host;

And an update unit, configured to not receive the multicast group state change message fed back by the second host within the specified time, and update the interface board according to the multicast group state change message received by the first packet receiving unit The multicast group status;

a sending unit, configured to: after the first packet receiving unit receives the multicast group state change message, And when the multicast group state change message fed back by the second host is not received within the specified time, the preset number of the multicast group state change packet is sent to the main control board.

The interface board according to claim 11, wherein the interface board further includes: a second packet receiving unit, configured to: after the query message sending unit sends the query message to the second host, Receiving a multicast group status message fed back by the second host;

The timer processing unit is configured to reset the multicast group timer when the second packet receiving unit receives the multicast group status message fed back by the second host within a predetermined time.

13. An interface board, comprising:

a first packet receiving unit, configured to receive a join message sent by the first host;

a storage unit, configured to store a multicast group list;

a adding unit, configured to add a multicast group recorded in the join message when the multicast group recorded in the join message received by the first packet receiving unit is not stored in the storage unit;

The sending unit is configured to send the join message received by the first packet receiving unit to the main control board.

The interface board according to claim 13, wherein the interface board further includes a timer;

The timer processing unit is configured to: when the storage unit stores the multicast group recorded in the join message received by the first packet receiving unit, reset the multicast group timer;

The adding unit is further configured to add the first host to the multicast group of the join message record received by the first receiving unit.

15. A router, comprising:

The interface board is configured to: receive a packet sent by the host, and send a query message to the host; if the multicast group status message sent by the host is not received within the specified time, the packet is sent according to the host Updating the multicast group status, and sending the preset number of packets;

The main control board is configured to receive the preset number of packets sent by the interface board, and update the state of the multicast group according to the preset number of packets.

The router according to claim 15, wherein the interface board comprises: a first packet receiving unit, configured to receive a multicast group state change message sent by the first host; and query a message sending unit, After the first packet receiving unit receives the multicast group state change packet, sending a query message to the second host; And an update unit, configured to not receive the multicast group state change message fed back by the second host within the specified time, and update the interface board according to the multicast group state change message received by the first packet receiving unit The multicast group status;

The sending unit is configured to: after the first packet receiving unit receives the multicast group state change message, and does not receive the multicast group state change message fed back by the second host within a predetermined time, the sending unit is configured to preset The number of the multicast group state change packets is sent to the main control board.

The router according to claim 15, wherein the main control board includes: a first packet receiving unit, configured to receive a join message sent by the first host;

a storage unit, configured to store a multicast group list;