CN101232510A - Method and system for realizing multicasting of multi-network port devices - Google Patents

Abstract

The present invention relates to a multicast implementation method of a multi-network port device, comprising: step 1, mapping one or more multicast addresses to a port number on the multi-network port device, so as to prevent the multicast destination machine from receiving the same message; step 2, when the port state corresponding to the port number changes, update the one or more multicast addresses to the corresponding port number, so as to avoid the port state corresponding to the port number from changing As a result, the GMP message cannot be sent. The invention adopts a fixed algorithm to realize the correspondence between the multicast address and the effective physical port, so that the IGMP Report message of a certain multicast address is always sent out from one physical port.

Description

Method and system for realizing multicasting of multi-network port devices

technical field

The present invention relates to multicast, in particular to a multicast implementation method and system for multi-network port devices.

Background technique

For a general server or client, if there are two or more external ports and it is desired that these ports all join the same multicast group at the same time, the networking diagram is shown in Figure 1. At this time, if the IGMP Snooping function is enabled on the L2 switch (Switch), both ports on the switch will listen to the Internet Group Management Protocol (IGMP) report (Report) message of the same multicast group. The same two copies of the multicast service message sent by the broadcast source will be sent to the same multicast destination machine.

For this kind of networking, the usual practice is to use a third-party protocol to aggregate the two ports on the same device, so as to prevent the multicast destination from receiving duplicate messages.

The disadvantage of this processing is that other protocols (such as port aggregation, etc.) need to be used to realize it, but not all devices support such protocols as port aggregation. When port aggregation cannot be performed, the multicast destination machine will receive For double (or multiple) messages, the choice can only be made through the upper-layer protocol, which seriously affects the processing performance and cannot meet the requirements under specific conditions. In addition, for occasions with relatively high real-time requirements, protocols such as port aggregation cannot meet specific requirements.

Especially for communication equipment, as shown in FIG. 2 , it usually consists of an interface line card, a switching line card, a protocol processing line card, and a backplane connecting these line cards. The switching line card is the switching center of the Layer 2 Ethernet, and its function is equivalent to an L2 Switch; the interface line card is mainly responsible for receiving requests from external users, and then transfers them to the protocol processing line card in the network element for processing; how many protocol processing line cards are there? They are used to process different types of service packets, such as voice decoding, real-time data transmission, and so on. The part of the interface line card that responds to external user requests is called the external user plane, and the part that is transferred from the interface line card to the protocol processing line card in the network element is called the internal user plane.

In the common networking shown in Figure 3, for the external user plane, since the external network connected to it is standard Ethernet, it is recommended to use the port aggregation protocol for interconnection; for the internal user plane, since the port aggregation protocol is not supported, the If the multicast solution is implemented, repeated packets need to be properly processed, which affects performance.

Contents of the invention

In order to solve the above-mentioned technical problems, a method and system for implementing multicasting of multi-network port devices are provided. The purpose is to achieve good load sharing without port aggregation. , the switchover can be performed very quickly, with minimal impact on services.

The invention provides a method for realizing multicasting of multi-network port devices, including:

Step 1, map one or more multicast addresses to a port number on the multi-network port device to prevent the multicast destination from receiving the same message;

Step 2, when the state of the port corresponding to the port number changes, update the one or more multicast addresses to the corresponding port number, so as to avoid the inability to send due to the change of the port state corresponding to the port number IGMP messages.

In step 1, a mapping relationship table between multicast addresses and port numbers is also set.

In step 1, the multicast address is the multicast IP address joined by the protocol processing line card, and the mapping is to calculate the port number based on the multicast IP address and port status.

In step 1, the port number is the port number of the available port corresponding to the remainder of dividing the multicast address by the maximum number of ports of the protocol processing line card.

Step 1 also includes:

Step 51, when receiving the message waiting to join the multicast group, add the message to the multicast group, and check whether the multicast group exists, if it exists, then execute step 53, otherwise execute step 52;

Step 52, calculate the port number according to the multicast address, and add the mapping relationship between the multicast address and the port number to the mapping relationship table between the multicast address and the port number, and perform step 53;

Step 53, setting the IGMP message type as a report, adding to the message sending queue;

Step 54, check the sending queue, and prepare to send the IGMP message.

Step 1 also includes:

Step 61, when receiving the message waiting to leave the multicast group, and check whether the multicast group exists, if it exists, then execute step 62, otherwise do not carry out any processing;

Step 62, delete the mapping relationship between the multicast address and the port number according to the multicast group address;

Step 63, setting the IGMP message type as leaving, adding to the message sending queue;

Step 64, check the sending queue, and prepare to send the IGMP message.

Port status includes port available and port unavailable.

In step 2, when the state of the port is that the port is unavailable, select a port number from the remaining available ports as the corresponding port number.

In step 2, the remaining available ports are arranged by polling.

The invention provides a system for realizing multicasting of multi-network port devices, including:

The multicast address and port number mapping module is used to map one or more multicast addresses to a port number on the multi-network port device, so as to prevent the multicast destination from receiving the same message;

The multicast address and port number mapping update module is used to update the one or more multicast addresses to the corresponding port numbers when the state of the port corresponding to the port number changes, so as to avoid The status of the port changes, so IGMP packets cannot be sent.

The multicast implementation method of multi-network port equipment of the present invention adopts a fixed algorithm to realize the correspondence between multicast addresses and effective physical ports, so that the IGMP Report message of a certain multicast address is always sent out from one physical port; when there are multiple When using multiple multicast addresses, it can achieve good load sharing; at the same time, changes in port status have minimal impact on services.

Description of drawings

FIG. 1 is a schematic diagram of common networking in the prior art;

Fig. 2 is a schematic structural diagram of communication processing equipment in the prior art;

Fig. 3 is a schematic diagram of networking of communication processing equipment in the prior art;

Fig. 4 is a schematic flow diagram of a multicast implementation method of multi-network port devices of the present invention;

Fig. 5 is a structural diagram of the multicast implementation system of multi-network port devices in the present invention.

Detailed ways

In the present invention, a multicast group address and port number correspondence table is established and maintained on the multi-network port device, which may be that a multicast group address corresponds to a port number or multiple multicast group addresses correspond to a port number; wherein, The multicast group address is a series of multicast IP addresses that the protocol processes line cards to join; and the port number is calculated according to a certain method based on different multicast IP addresses and the current state of the port. These port numbers directly Corresponding to the physical port number of the protocol processing line card, it is selected to be used when the multicast group sends out IGMP Report messages.

In the multicast implementation method of the above-mentioned multi-network port device, when the port status of the protocol processing line card changes, the entry corresponding to the changed port in the table will be appropriately updated, and the multicast address is calculated and replaced. into an available port number.

The multi-network port device multicast implementation method flow chart of the present invention is shown in Figure 4, specifically including the following steps:

Step 401, initialize the multicast address and port mapping table, such as memory allocation and initialization, etc.;

Step 402, enter the message processing function, and wait for a message such as joining a multicast group or leaving a multicast group. When receiving the message of joining the multicast group, then proceed to step 403; when receiving the message of leaving the multicast group, then proceed to step 406;

Step 403, look up the table according to the multicast address to see whether the same multicast group already exists in the entry; if it exists, then proceed to step 405; if not, then proceed to step 404;

Step 404, calculate the port number according to the multicast address; then write the multicast address/port mapping table together with the multicast address;

The method of calculating the port number in the above steps is:

Port number = the remainder of the multicast address/protocol processing line card maximum port number;

Step 405, setting the IGMP message type as Report, and adding it to the message sending queue;

Step 406, the same function as step 403 above; if it exists, go to step 407; if it does not exist, it will not be processed;

Step 407, searching the multicast address/port mapping relationship table according to the multicast address, and deleting the found entries;

Step 408, setting the IGMP message type as leaving (Leave), adding in the message sending queue;

Step 409, check the sending queue, if there is a message, then take out the multicast address and the outgoing port one by one, and prepare to send;

Step 410, for the multicast address that needs to send the IGMP message, see whether the corresponding port in the port mapping table is valid; if valid, then go to step 412; if invalid, then go to step 411;

Step 411, selecting a valid physical port number to replace the invalid port number in the entry;

The method for selecting a valid port number in the above steps is:

Map the effective port number to the port array in a polling manner, and the maximum entry of this array corresponds to the maximum number of ports of the protocol processing line card;

Assuming that the current maximum port number of the protocol processing line card is 4, you can define a port array as aucPortIndex[4];

If the number of ports available at this time is 4, and the port numbers are 1, 2, 3, 4 respectively; then the corresponding values in the array are {1, 2, 3, 4};

If the number of ports available at this time is 1 (if the available port number is 2); then the value corresponding to the array is {2, 2, 2, 2};

If the number of ports available at this time is 2 (if the available port numbers are 1, 4); then the values corresponding to the array are {1, 4, 1, 4};

If the number of ports available at this time is 3 (if the available port numbers are 1, 2, 3); then the values corresponding to the array are {1, 2, 3, 1};

The principle of available port mapping is round robin, but it is required to be evenly distributed in the array as far as possible. Therefore, the selection method of the effective port number is as follows:

Effective port number = aucPortIndex[maximum number of ports of multicast address MOD protocol processing line card];

Step 412, send the IGMP message from the valid port.

When the physical status of the port changes from UP to DOWN, check whether there is a port number corresponding to this port in the multicast address/port mapping relationship table, if so, go to the above step 405, and send a Report message to the outside Change the port to update.

Through the above steps, it can be ensured that when the multi-network port device is connected to the L2 Switch, the network shown in Figure 3 will not cause the protocol processing line card to receive repeated multicast packets. Moreover, when the status of one or several ports changes, port switching can be completed quickly, reducing service packet loss.

In order to realize the implementation method of multicasting of multi-network port devices provided by the present invention, the present invention provides a system 500 for realizing multicasting of multi-network port devices, as shown in FIG. 5 , including:

The multicast address and port number mapping module 501 is used for mapping one or more multicast addresses to a port number on the multi-network port device, so as to prevent the multicast destination machine from receiving the same message;

The multicast address and port number mapping update module 502 is used to update the one or more multicast addresses to the corresponding port numbers when the state of the port corresponding to the port number changes, so as to avoid The status of the corresponding port changes, so IGMP packets cannot be sent.

Various modifications can be made to the above contents by those skilled in the art without departing from the spirit and scope of the present invention defined by the claims. Therefore, the scope of the present invention is not limited to the above description, but is determined by the scope of the claims.

Claims (10)

1. the implementation method of a multi-network port device multicast is characterized in that, comprising:

Step 1 is mapped to a port numbers with one or more multicast address on multi-network mouth device, be used to avoid multicast purpose machine to receive identical message;

Step 2 when described port numbers corresponding port state changes, is updated to corresponding ports number with described one or more multicast address, is used to avoid cause sending the IGMP message because of described port numbers corresponding port state changes.

2. the implementation method of multi-network port device multicast as claimed in claim 1 is characterized in that, in the step 1, the mapping relations table of multicast address and port numbers is set also.

3. the implementation method of multi-network port device multicast as claimed in claim 2 is characterized in that, in the step 1, and the multicast ip address that multicast address adds for the protocol processes ply-yarn drill, described being mapped as according to multicast ip address and port status calculated port numbers.

4. the implementation method of multi-network port device multicast as claimed in claim 3 is characterized in that, in the step 1, port numbers is the port numbers of multicast address divided by the available port of the remainder correspondence of the maximum port number of protocol processes ply-yarn drill.

5. the implementation method of multi-network port device multicast as claimed in claim 3 is characterized in that, step 1 also comprises:

Step 51 when the message of multicast group to be added such as receiving, adds multicast group with this message, and checks whether this multicast group exists, if exist, then execution in step 53, otherwise execution in step 52;

Step 52 is calculated port numbers according to multicast address, and with the mapping relations adding multicast address of this multicast address and port numbers and the mapping relations table of port numbers, execution in step 53;

Step 53 is provided with the IGMP type of message for report, joins the message transmit queue;

Step 54 is checked transmit queue, is ready for sending the IGMP message.

6. the implementation method of multi-network port device multicast as claimed in claim 3 is characterized in that, step 1 also comprises:

Step 61 receives and waits for when leaving the message of multicast group, and checks whether this multicast group exists, if exist, then execution in step 62, otherwise do not carry out any processing;

Step 62 is according to the mapping relations of multicast group address deletion multicast address and port numbers;

Step 63 is provided with the IGMP type of message for leaving, and joins the message transmit queue;

Step 64 is checked transmit queue, is ready for sending the IGMP message.

7. the implementation method of multi-network port device multicast as claimed in claim 4 is characterized in that, port status comprises that port can be with unavailable with port.

8. the implementation method of multi-network port device multicast as claimed in claim 7 is characterized in that, in the step 2, when port status is port when unavailable, the port numbers of selecting a port in all the other available ports is as corresponding ports number.

9. the implementation method of multi-network port device multicast as claimed in claim 8 is characterized in that, in the step 2, all the other available ports are arranged by the mode of poll.

10. a system that is used for as the implementation method of any described multi-network port device multicast of claim 1-9 is characterized in that, comprising:

Multicast address and port numbers mapping block are used on multi-network mouth device one or more multicast address being mapped to a port numbers, receive identical message to avoid multicast purpose machine;

Multicast address and port numbers map updating module, be used for when described port numbers corresponding port state changes, described one or more multicast address are updated to corresponding ports number, cause to send the IGMP message because of described port numbers corresponding port state changes avoiding.

Images