WO2022082825A1 - Multicast system and multicast method for identifier resolution-based routing - Google Patents

Abstract

The present invention relates to the technical field of network communication and data processing, and relates in particular to a multicast system for identifier resolution-based routing. The system comprises a multicast source, multicast receivers, multicast member agents, and multicast processing nodes. The system further comprises an identifier resolution service module deployed in the cloud or in a network. The module uses a global unique identifier unrelated to any network addresses as a multicast identifier capable of uniquely identifying a multicast service, while IP network addresses are still used as network addresses. The module is further used to maintain mapping relationships between the multicast identifier and IP network addresses of one or more multicast processing nodes, and to provide registration, deregistration, and resolution and query services. Network nodes hosting a multicast bearer service comprise the multicast processing nodes and IP network routing and switching nodes. The multicast receivers apply to join the multicast service by means of the multicast identifier.

Description

A kind of multicast system and multicast method based on identification resolution route

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202011144897.7 filed on October 23, 2020, which is fully incorporated herein by reference.

technical field

The invention belongs to the technical field of network communication and data processing, and in particular relates to a multicast system and a multicast method based on identification resolution route.

Background technique

In recent years, a variety of new services and applications have appeared on the network, a large part of which are multimedia services based on high bandwidth and high network resource requirements, such as distance education, IPTV, video conferencing, and multiplayer games. The main features of these services are single-source or multi-source sending, multi-purpose receiving (one-to-many or many-to-many), and the data sent by the sender is extremely repetitive. At the same time, as 5G opens a new era of Internet of Everything, the Internet of Things brings a large amount of one-to-many data transmission. In the face of these services, when the unicast method is used, the repeated transmission of IP data packets will waste a lot of bandwidth and increase the burden on the server; if the broadcast method is used, the information must not only be sent to some unnecessary hosts but Wasting bandwidth and possibly causing broadcast storms due to routing loops.

At present, the multicast technology can solve the above problems relatively well. Multicast technology refers to a kind of network communication in which a single sender corresponds to multiple receivers. In the multicast technology, by transmitting a single information stream to multiple receivers, the network communication traffic can be reduced when multiple receivers listen or view the same resources at the same time. For an n-party video conference, the bandwidth length can be reduced by a (n-1) times. The main feature of multicast technology is to divide the members of the application into a group according to the actual situation, and the distribution of data will be limited to the group. It can provide the same data transmission from a single point to multiple points in the network at the same time. , two or more destination network hosts do not need to send data packets on duplicate links, but only need to copy and distribute data packets at the branch nodes of the multicast tree, which can not only effectively save network resources, but also improve bandwidth utilization Rate. However, in the traditional IP network architecture, all routers need to support the distributed multicast protocol, and the construction, maintenance and update of the multicast tree require a large amount of information exchange between multicast routers, and these control states will consume A large number of network resources make it difficult to deploy IP multicast on a large scale in traditional networks.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems in the existing multicast methods, the present invention proposes a multicast system based on identification resolution route, the system includes: a multicast source, a multicast receiver, a multicast member agent and a multicast processing node; The system also includes: an identification resolution service module deployed in the cloud or in the network, used for using a globally unique identifier irrelevant to the network address as a multicast identifier, capable of uniquely identifying a multicast service, while the network address is still IP the address of the network;

It is also used to maintain the mapping relationship between the multicast identifier and the IP network addresses of one or more multicast processing nodes;

It is also used to provide registration, cancellation, and resolution query services;

The network nodes that bear multicast include: multicast processing nodes and IP network routing switching nodes;

The multicast receiver is used to apply for joining the multicast service through the multicast identifier.

As one of the improvements of the above technical solutions, the identification resolution service module is also used to provide registration, cancellation, resolution query services; specifically:

The identification resolution service module supports the registration and deregistration of the mapping relationship between the multicast identifier and the IP network addresses of one or more multicast processing nodes, and queries the IP network addresses of the multicast processing nodes through the resolution of the multicast identifier ; wherein, a multicast identifier corresponds to the IP network addresses of one or more multicast processing nodes.

As one of the improvements of the above technical solutions, the number of the multicast processing nodes is one or more, which are used to realize the functions of the IP network routing switching nodes;

It is also used to forward or process the modified join request message, determine whether the destination network address in the modified join request message is the network address of the currently received multicast processing node, and forward the modified join request message according to the judgment result. Or construct and forward request response messages;

It is also used to encapsulate and send multicast data packets, and forward multicast data packets according to the updated, locally maintained multicast forwarding table;

The multicast processing node located at the edge of the network adopts the multicast protocol proxy to modify the join request message sent by the multicast member proxy, and forwards the modified join request message to the selected multicast processing node.

As one of the improvements of the above technical solutions, the multicast processing node located at the edge of the network uses a multicast protocol proxy to modify the join request message sent by the multicast member proxy, and forwards the modified join request message to the selected Multicast processing node; its specific implementation process is:

The multicast processing node located at the edge of the network receives and processes the join request message based on the multicast identifier forwarded by the multicast member agent, sends a resolution request to the identification resolution service module, and parses the multicast identifier carried in the join request message. , obtain a group of multicast processing nodes corresponding to the multicast identifier carried in the join request message and their corresponding IP network addresses, select one of the multicast processing nodes, and modify the destination network address in the join request message to the selected one The IP address of the multicast processing node obtains the modified join request message, and forwards the modified join request message to the selected multicast processing node.

Among them, by adopting the multicast protocol proxy, the modified join request message can also be constructed, encapsulated and sent.

As one of the improvements of the above technical solutions, the modified join request message is forwarded in a network layer message format, which includes: a source network address, a destination network address and a multicast identifier; wherein the source network address is The IP network address of the multicast member agent; the destination network address is the IP network address of a certain multicast processing node.

As one of the improvements of the above technical solutions, the multicast forwarding table includes: a group of multicast forwarding table entries;

Wherein, each multicast forwarding entry in the group of multicast forwarding entries further includes: a multicast identifier and an outgoing port list;

Wherein, the outgoing port list further includes: multiple forwarding ports;

The multicast identifier is a key, and the outgoing port list is a value; a multicast identifier corresponds to one or more forwarding ports.

As one of the improvements of the above technical solutions, the multicast processing node is used to forward or process the modified join request message, and determine whether the destination network address in the modified join request message is the address of the currently received multicast processing node. network address, and forward the modified join request message or construct and forward the request response message according to the judgment result; the specific implementation process is as follows:

The multicast processing node receives the modified join request message, and determines whether the destination network address carried in the modified join request message is the IP network address of the multicast processing node currently receiving the modified join request message;

If the destination network address carried in the modified join request message is not the IP network address of the multicast processing node that currently receives the modified join request message, then according to the destination network address in the modified join request message, the IP network routing is performed. Forward to the correct multicast processing node;

If the destination network address carried in the modified join request message is the network address of the multicast processing node that currently receives the modified join request message, update the local multicast forwarding table according to the modified join request message, and construct a Forward request response message.

As one of the improvements of the above technical solutions, the request response message is forwarded in a network layer message format, which includes: a source network address, a destination network address and a multicast identifier; wherein, the source network address is a multicast process The network address of the node; the destination network address is the network address of the multicast member proxy.

As one of the improvements of the above technical solutions, according to the modified join request message, the local multicast forwarding table is updated, and the request response message is constructed and forwarded. The specific process is:

The multicast processing node queries the locally maintained multicast forwarding table whether the multicast identifier carried in the modified join request message is included;

If the multicast processing node finds the multicast identifier carried in the modified join request message in the local multicast forwarding table, then according to the source network address of the modified join request message, in the local routing table Query and get the forwarding port;

Find out whether the forwarding port obtained by the above query is included in the outgoing port list corresponding to the multicast identifier in the multicast forwarding table;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table does not contain the forwarding port obtained by the above query, add the forwarding port to the outgoing port list;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table includes the forwarding port obtained by the above query, go to the next step:

The multicast processing node constructs a request response message and a reply request response message, and the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent;

If the multicast processing node does not query the local multicast forwarding table to include the multicast identifier carried in the modified join request message, the feedback is abnormal.

As one of the improvements of the above technical solutions, the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent; specifically:

The next multicast processing node receives the forwarded request-response message, extracts the multicast identifier and destination network address from it, and finds the corresponding forwarding in the locally maintained routing table according to the destination network address carried in the request-response message port;

Query whether the multicast identifier carried in the request response message is included in the locally maintained multicast forwarding table;

If the next multicast processing node finds the multicast identifier carried in the request response message in the locally maintained multicast forwarding table, it obtains the list of outgoing ports corresponding to the multicast identifier, and further determines the outgoing port. Whether the list contains the forwarding port;

If there is the forwarding port in the outgoing port list, the request response message is directly forwarded from the forwarding port;

If the forwarding port is not included in the outgoing port list, add the forwarding port in the outgoing port list, and directly forward the request response message from the forwarding port;

If the next multicast processing node does not find the multicast identifier carried in the request response message in the local routing table, it will add the multicast identifier and the above forwarding port in the multicast forwarding table, and update the multicast forwarding published, and register the mapping relationship between the multicast identifier and the IP network address of the multicast processing node with the ID resolution service module, so as to become a multicast processing node corresponding to the multicast service, and the multicast processing node will The request-response message is forwarded from the forwarding port above until forwarded to the multicast member proxy.

As one of the improvements of the above technical solutions, the multicast data message includes a source network address, a destination network address and a multicast identifier; the source network address is a network address of an intra-network multicast processing node that implements multicast.

As one of the improvements of the above technical solutions, the multicast processing node is also used to forward multicast data packets; the specific implementation process is as follows:

Query whether the multicast forwarding table maintained locally contains the multicast identifier carried in the multicast data packet;

If the multicast forwarding table maintained locally contains the above-mentioned multicast identifier, all outgoing ports corresponding to the multicast identifier carried in the multicast data packet are obtained, and the multicast data packet is removed from the multicast forwarding table. All outgoing ports corresponding to the multicast identifier replicate the multicast data packet;

If the multicast forwarding table does not contain the above-mentioned multicast identifier, error processing is performed, and the corresponding processing result is fed back.

As one of the improvements of the above technical solutions, there are one or more multicast member agents and one or more multicast receivers, and the multicast member agents and the multicast receivers are located in the same broadcast domain; multicast The member agent has a local local identifier, which is used for information exchange between the multicast receiver and the multicast member agent in the local broadcast domain;

It is also used to maintain the mapping relationship between the multicast identifier and the local local identifier;

It is also used to obtain the multicast member report message sent by the multicast receiver, construct a join request message according to the multicast member report message, and then send the constructed join request message to the multicast processing node;

It is also used to obtain the multicast data message sent by the multicast processing node and forward it to the multicast receiver;

Wherein, the local local identifier is unique in the local broadcast domain, which is specifically, but not limited to, an IP multicast group address.

The present invention also provides a multicast method based on identification resolution route, the method includes:

Step 1) The multicast receiver sends a multicast member report message with a multicast identifier to the multicast member agent, and the multicast member agent constructs a join request message according to the multicast member report message, and sends the constructed join request message To the nearest multicast processing node at the network edge, the multicast processing node modifies the join request message sent by the multicast member proxy through the multicast protocol proxy, and forwards the modified join request message to the correct multicast processing node;

Step 2) The multicast processing node judges whether the destination network address of the received modified join request message is the network address of the currently received multicast processing node, and according to the judgment result, forwards the modified join request message or constructs and forwards the request response message;

Step 3) The multicast processing node updates the locally maintained multicast forwarding table according to the received request response message, and forwards the multicast data message to the multicast member agent according to the locally maintained multicast forwarding table.

As one of the improvements of the above-mentioned technical solutions, the specific process of the step 1) is as follows:

The multicast source publishes the multicast service with the multicast identifier, the multicast receiver applies for joining the multicast service with the multicast identifier through the multicast identifier, and sends a message containing the multicast identifier to the local broadcast domain. Multicast member report message;

The multicast member agent receives the multicast member report message and constructs a join request message, and the multicast member agent sends the constructed join request message to the nearest multicast processing node located at the network edge,

The multicast processing node located at the edge of the network receives the join request message forwarded by the multicast member agent, requests a query from the identification resolution service module, and obtains a group of multicast processing nodes corresponding to the multicast identifier carried in the join request message and their corresponding network address, select one of the multicast processing nodes, modify the destination network address in the join request message to the network address of the selected multicast processing node, obtain the modified join request message, and forward the modified request message to The selected multicast processing node.

As one of the improvements of the above-mentioned technical solutions, the specific process of the step 2) is as follows:

The multicast processing node receives the modified join request message, and determines whether the destination network address carried in the modified join request message is the network address of the multicast processing node currently receiving the modified join request message;

If the destination network address carried in the modified join request message is not the network address of the multicast processing node that currently receives the modified join request message, then according to the destination network address in the modified join request message, IP network routing is performed. Forward until forwarded to the correct multicast processing node;

If the destination network address carried in the modified join request message is the network address of the multicast processing node currently receiving the modified join request message, update the locally maintained multicast forwarding table according to the modified join request message, and construct And forward the request response message.

As one of the improvements of the above technical solutions, according to the modified join request message, the local multicast forwarding table is updated, and the request response message is constructed and forwarded, specifically:

The multicast processing node queries the locally maintained multicast forwarding table whether the multicast identifier carried in the modified join request message is included;

If the multicast processing node finds the multicast identifier carried in the modified join request message in the local multicast forwarding table, then according to the source network address of the modified join request message, in the local routing table Query and get the forwarding port;

Find out whether the forwarding port obtained by the above query is included in the outgoing port list corresponding to the multicast identifier in the multicast forwarding table;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table does not contain the forwarding port obtained by the above query, add the forwarding port to the outgoing port list;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table includes the forwarding port obtained by the above query, go to the next step:

The multicast processing node constructs a request response message and a reply request response message, and the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent;

If the multicast processing node does not query the local multicast forwarding table to include the multicast identifier carried in the modified join request message, the feedback is abnormal.

As one of the improvements of the above technical solutions, the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent; specifically:

The next multicast processing node receives the forwarded request-response message, extracts the multicast identifier and destination network address from it, and finds the corresponding forwarding in the locally maintained routing table according to the destination network address carried in the request-response message port;

Query whether the multicast identifier carried in the request response message is included in the locally maintained multicast forwarding table;

If the next multicast processing node finds the multicast identifier carried in the request response message in the local multicast forwarding table, it obtains the list of outgoing ports corresponding to the multicast identifier, and further judges the list of outgoing ports. Whether to include the forwarding port;

If there is the forwarding port in the outgoing port list, the request response message is directly forwarded from the forwarding port;

If the forwarding port is not included in the outgoing port list, add the forwarding port in the outgoing port list, and directly forward the request response message from the forwarding port;

If the next multicast processing node does not find the multicast identifier carried in the request response message in the local multicast forwarding table, it will add the multicast identifier and the above forwarding port to the multicast forwarding table, and update the group broadcast forwarding table, and register the mapping relationship between the multicast identifier and the IP network address of the multicast processing node to the ID resolution service module, so as to become a multicast processing node corresponding to the multicast service, and the multicast processing node The request-response message is forwarded from the above forwarding port until it is forwarded to the multicast member proxy.

As one of the improvements of the above technical solutions, in the step 3), according to the multicast forwarding table maintained locally, the multicast data message is forwarded to the multicast member agent, and the specific process is as follows:

After receiving the multicast data packet, the multicast processing node queries whether the multicast forwarding table maintained locally contains the multicast identifier carried in the multicast data packet;

If the multicast forwarding table maintained locally contains the above-mentioned multicast identifier, all outgoing ports corresponding to the multicast identifier carried in the multicast data packet are obtained, and the multicast data packet is removed from the multicast forwarding table. All outgoing ports corresponding to the multicast identifier replicate the multicast data packet,

If the multicast forwarding table does not contain the above-mentioned multicast identifier, error processing is performed, and the corresponding processing result is fed back.

As one of the improvements of the above technical solutions, the error handling includes: discarding multicast data packets, feeding back error information to the upper-level multicast processing node, feeding back error information to all its adjacent multicast processing nodes, and updating the multicast forwarding table And add the multicast forwarding entry corresponding to the multicast identifier carried in the multicast data packet.

The beneficial effects of the present invention compared with the prior art are:

The method of the invention makes full use of the feature of separating the multicast identifier and the network address, realizes the mapping between the multicast identifier and the IP network address of the multicast processing node by identifying the resolution service module, and forwards the multicast datagram in the network. The multicast processing node in this paper registers the multicast identifier and its IP address with the ID resolution service module, and the multicast receiver can obtain the nearby multicast processing nodes through the ID resolution service module, which simplifies the construction of the multicast tree and improves the efficiency of multicast services.

Description of drawings

Fig. 1 is a kind of structure schematic diagram of the multicast system based on identification resolution route of the present invention;

2 is a schematic structural diagram of a multicast data message based on a multicast method for identifying and resolving routes according to the present invention;

FIG. 3 is a schematic structural diagram of a multicast forwarding table based on a multicast method for identifying and resolving routes according to the present invention;

4 is a flowchart of processing a request-response message by a multicast processing node in a multicast method for route-based identification resolution according to the present invention;

5 is a flowchart of processing a multicast data message by a multicast processing node in a multicast method for route-based identification resolution according to the present invention;

Fig. 6 is a kind of processing schematic diagram of the multicast receiver 1 joining the multicast service EID1 in a specific embodiment of the multicast method based on identification resolution route of the present invention;

7 is a schematic diagram of the processing of the multicast processing node 2 replying to a request response message in a specific embodiment of a multicast method based on identification resolution routing of the present invention;

FIG. 8 is a schematic diagram of forwarding of a multicast data message in a specific embodiment of a multicast method for route-based identification resolution according to the present invention.

Detailed ways

The present invention will now be further described with reference to the accompanying drawings.

As shown in FIG. 1 , the present invention provides a multicast system based on identification resolution route, the system includes: a multicast source, a multicast receiver, a multicast member agent and a multicast processing node; the system also includes: a deployment The identification resolution service module in the cloud or network is used to use a globally unique identifier unrelated to the network address as a multicast identifier, which can uniquely identify a multicast service, while the network address is still the address of the IP network;

It is also used to maintain the mapping relationship between the multicast identifier and the IP network addresses of one or more multicast processing nodes that implement the multicast service;

It is also used to provide registration, cancellation, and resolution query services;

The network nodes that bear multicast include: multicast processing nodes and IP network routing switching nodes, that is, ordinary routers;

The multicast receiver is used to apply for joining the multicast service through the multicast identifier.

The multicast identifier is a globally unique identifier that is independent of the network address and can uniquely identify a multicast service. A multicast identifier corresponds to only one multicast service, and each multicast identifier corresponds to multiple multicast services. Processing nodes and their corresponding IP network addresses; wherein, based on the architecture of information center network representation and address separation, a multicast service is uniquely represented by an identifier unrelated to the network address, the identifier is a multicast identifier, and The network address still uses the IP network address.

The identification resolution service module is also used to provide registration, cancellation, resolution and query services; specifically:

The identification resolution service module supports the registration and deregistration of the mapping relationship between the multicast identifier and the IP network addresses of one or more multicast processing nodes that implement the multicast service, as well as querying the multicast processing through the resolution of the multicast identifier The IP network address of the node; wherein, a multicast identifier corresponds to the IP network addresses of one or more multicast processing nodes.

The number of the multicast processing nodes is one or more, and is used to realize the functions of the IP network routing switching nodes; in addition to the functions of the IP network routing switching nodes, it also has the following functions:

It is also used to forward or process the modified join request message, determine whether the destination network address in the modified join request message is the network address of the currently received multicast processing node, and forward the modified join request message according to the judgment result. Or construct and forward request response messages;

Specifically, the multicast processing node receives the modified join request message, and determines whether the destination network address carried in the modified join request message is the IP network address of the multicast processing node currently receiving the modified join request message;

If the destination network address carried in the modified join request message is not the IP network address of the multicast processing node that currently receives the modified join request message, then according to the destination network address in the modified join request message, the IP network routing is performed. Forward to the correct multicast processing node;

If the destination network address carried in the modified join request message is the network address of the multicast processing node that currently receives the modified join request message, update the local multicast forwarding table according to the modified join request message, and construct a Forward request response message.

Specifically, the multicast processing node queries whether the multicast forwarding table maintained locally contains the multicast identifier carried in the modified join request message;

If the multicast processing node finds the multicast identifier carried in the modified join request message in the local multicast forwarding table, then according to the source network address of the modified join request message, in the local routing table Query and get the forwarding port;

Find out whether the forwarding port obtained by the above query is included in the outgoing port list corresponding to the multicast identifier in the multicast forwarding table;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table does not contain the forwarding port obtained by the above query, add the forwarding port to the outgoing port list;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table includes the forwarding port obtained by the above query, go to the next step:

The multicast processing node constructs a request response message and a reply request response message, and the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent;

Specifically, as shown in FIG. 4 , the next multicast processing node receives the forwarded request response message, extracts the multicast identifier and the destination network address from it, and maintains the local network address according to the destination network address carried in the request response message. Find the corresponding forwarding port in the routing table;

Query whether the multicast identifier carried in the request response message is included in the locally maintained multicast forwarding table;

If the next multicast processing node finds the multicast identifier carried in the request response message in the locally maintained multicast forwarding table, it obtains the list of outgoing ports corresponding to the multicast identifier, and further determines the outgoing port. Whether the list contains the forwarding port;

If there is the forwarding port in the outgoing port list, the request response message is directly forwarded from the forwarding port;

If the forwarding port is not included in the outgoing port list, add the forwarding port in the outgoing port list, and forward the request-response message directly from the forwarding port;

If the next multicast processing node does not find the multicast identifier carried in the request response message in the local routing table, it will add the multicast identifier and the above forwarding port in the multicast forwarding table, and update the multicast forwarding published, and register the mapping relationship between the multicast identifier and the IP network address of the multicast processing node with the ID resolution service module, so as to become a multicast processing node corresponding to the multicast service, and the multicast processing node will The request response message is forwarded from the above forwarding port until it is forwarded to the multicast member proxy;

If the multicast processing node does not query the local multicast forwarding table to include the multicast identifier carried in the modified join request message, the feedback is abnormal.

Wherein, the request response message is forwarded in a network layer message format, which includes: a source network address, a destination network address and a multicast identifier; wherein the source network address is the network address of the multicast processing node; the The destination network address is the network address of the multicast member proxy.

It is also used to encapsulate and send multicast data packets, and forward multicast data packets according to the updated, locally maintained multicast forwarding table;

Specifically, the specific process of forwarding multicast data packets is as follows:

Query whether the multicast forwarding table maintained locally contains the multicast identifier carried in the multicast data packet;

If the multicast forwarding table maintained locally contains the above-mentioned multicast identifier, all outgoing ports corresponding to the multicast identifier carried in the multicast data packet are obtained, and the multicast data packet is removed from the multicast forwarding table. All outgoing ports corresponding to the multicast identifier replicate the multicast data packet;

If the multicast forwarding table does not contain the above-mentioned multicast identifier, error processing is performed, and the corresponding processing result is fed back.

The structure of the multicast data message is shown in Figure 2, and the multicast data message includes a source network address, a destination network address and a multicast identifier; the source network address is an intra-network multicast that implements multicast. The network address of the processing node.

The multicast processing node located at the edge of the network adopts the multicast protocol proxy to modify the join request message sent by the multicast member proxy, and forwards the modified join request message to the selected multicast processing node.

Specifically, the multicast processing node located at the edge of the network receives and processes the join request message based on the multicast identifier forwarded by the multicast member agent, sends a resolution request to the ID resolution service module, and interprets the multicast ID carried in the join request message. parse the identifier, obtain a group of multicast processing nodes corresponding to the multicast identifier carried in the join request message and their corresponding IP network addresses, select one of the multicast processing nodes, and modify the destination network address in the join request message to the IP address of the selected multicast processing node, obtain the modified join request message, and forward the modified join request message to the selected multicast processing node;

Among them, by adopting the multicast protocol proxy, the modified join request message can also be constructed, encapsulated and sent.

Wherein, the modified join request message is forwarded in a network layer message format, which includes: a source network address, a destination network address and a multicast identifier; wherein the source network address is the IP network of the multicast member proxy address; the destination network address is the IP network address of a certain multicast processing node.

The multicast forwarding table includes: a group of multicast forwarding table entries;

Wherein, each multicast forwarding entry in the group of multicast forwarding entries further includes: a multicast identifier and an outgoing port list;

Wherein, the outgoing port list further includes: multiple forwarding ports;

The multicast identifier is a key, and the outgoing port list is a value; one multicast identifier corresponds to multiple forwarding ports.

The multicast member agent is one or more, the multicast receiver is one or more, and the multicast member agent and the multicast receiver are located in the same broadcast domain; the multicast member agent has a local local identifier, It is used for information exchange between multicast receivers and multicast member agents in the local broadcast domain;

It is also used to maintain the mapping relationship between the multicast identifier and the local local identifier;

It is also used to obtain the multicast member report message sent by the multicast receiver, construct a join request message according to the multicast member report message, and then send the constructed join request message to the multicast processing node;

It is also used to obtain the multicast data message sent by the multicast processing node and forward it to the multicast receiver;

Wherein, the local local identifier is unique in the local broadcast domain, which is specifically, but not limited to, an IP multicast group address.

The present invention also provides a multicast method based on identification resolution route, the method includes:

Step 1) The multicast receiver sends a multicast member report message with a multicast identifier to the multicast member agent, and the multicast member agent constructs a join request message according to the multicast member report message, and sends the constructed join request message To the nearest multicast processing node at the network edge, the multicast processing node modifies the join request message sent by the multicast member proxy through the multicast protocol proxy, and forwards the modified join request message to the correct multicast processing node;

Specifically, the multicast source publishes the multicast service with the multicast identifier, the multicast receiver applies for joining the multicast service with the multicast identifier through the multicast identifier, and sends the multicast service containing the multicast identifier to the local broadcast domain. the identifier of the multicast membership report message;

The multicast member agent receives the multicast member report message and constructs a join request message, and the multicast member agent sends the constructed join request message to the nearest multicast processing node located at the network edge,

The multicast processing node located at the edge of the network receives the join request message forwarded by the multicast member agent, requests a query from the identification resolution service module, and obtains a group of multicast processing nodes corresponding to the multicast identifier carried in the join request message and their corresponding network address, select one of the multicast processing nodes, modify the destination network address in the join request message to the network address of the selected multicast processing node, obtain the modified join request message, and forward the modified request message to The selected multicast processing node.

Step 2) The multicast processing node judges whether the destination network address of the received modified join request message is the network address of the currently received multicast processing node, and according to the judgment result, forwards the modified join request message or constructs and forwards the request response message;

Specifically, the multicast processing node receives the modified join request message, and determines whether the destination network address carried in the modified join request message is the network address of the multicast processing node currently receiving the modified join request message;

If the destination network address carried in the modified join request message is not the network address of the multicast processing node that currently receives the modified join request message, then according to the destination network address in the modified join request message, IP network routing is performed. Forward until forwarded to the correct multicast processing node;

If the destination network address carried in the modified join request message is the network address of the multicast processing node currently receiving the modified join request message, update the locally maintained multicast forwarding table according to the modified join request message, and construct And forward the request response message.

Specifically, the multicast processing node queries whether the multicast forwarding table maintained locally contains the multicast identifier carried in the modified join request message;

If the multicast processing node finds the multicast identifier carried in the modified join request message in the local multicast forwarding table, then according to the source network address of the modified join request message, in the local routing table Query and get the forwarding port;

Find out whether the forwarding port obtained by the above query is included in the outgoing port list corresponding to the multicast identifier in the multicast forwarding table;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table does not contain the forwarding port obtained by the above query, add the forwarding port to the outgoing port list;

If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table includes the forwarding port obtained by the above query, go to the next step:

The multicast processing node constructs a request response message and a reply request response message, and the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent;

Specifically, the next multicast processing node receives the forwarded request response message, extracts the multicast identifier and the destination network address from it, and searches the locally maintained routing table according to the destination network address carried in the request response message. the corresponding forwarding port;

Query whether the multicast identifier carried in the request response message is included in the locally maintained multicast forwarding table;

If the next multicast processing node finds the multicast identifier carried in the request response message in the local multicast forwarding table, it obtains the list of outgoing ports corresponding to the multicast identifier, and further judges the list of outgoing ports. Whether to include the forwarding port;

If there is the forwarding port in the outgoing port list, the request response message is directly forwarded from the forwarding port;

If the forwarding port is not included in the outgoing port list, add the forwarding port in the outgoing port list, and directly forward the request response message from the forwarding port;

If the next multicast processing node does not find the multicast identifier carried in the request response message in the local multicast forwarding table, it will add the multicast identifier and the above forwarding port to the multicast forwarding table, and update the group broadcast forwarding table, and register the mapping relationship between the multicast identifier and the IP network address of the multicast processing node to the ID resolution service module, so as to become a multicast processing node corresponding to the multicast service, and the multicast processing node The request-response message is forwarded from the above forwarding port until it is forwarded to the multicast member proxy.

If the multicast processing node does not query the local multicast forwarding table to include the multicast identifier carried in the modified join request message, the feedback is abnormal.

Step 3) The multicast processing node updates the locally maintained multicast forwarding table according to the received request response message, and forwards the multicast data message to the multicast member agent according to the locally maintained multicast forwarding table.

Specifically, after receiving the multicast data message, the multicast processing node queries whether the locally maintained multicast forwarding table contains the multicast identifier carried in the multicast data message;

If the multicast forwarding table maintained locally contains the above-mentioned multicast identifier, all outgoing ports corresponding to the multicast identifier carried in the multicast data packet are obtained, and the multicast data packet is removed from the multicast forwarding table. All outgoing ports corresponding to the multicast identifier replicate the multicast data packet,

If the multicast forwarding table does not contain the above-mentioned multicast identifier, error processing is performed, and the corresponding processing result is fed back.

The error handling includes: discarding the multicast data message, feeding back error information to the upper-level multicast processing node, feeding back error information to all its adjacent multicast processing nodes, updating the multicast forwarding table and adding the multicast datagram The multicast forwarding entry corresponding to the multicast identifier carried in the text.

In the process of forwarding the multicast data message, as shown in FIG. 3 , the multicast forwarding table includes: a group packet identifier and a list of outgoing ports; the multicast identifier is a key, corresponding to the data carried in the multicast data message. Multicast identifier; the list of outgoing ports is a value, corresponding to a group of forwarding ports for forwarding multicast data packets.

Example 1.

In order to better illustrate the technical solution of the present invention, the following embodiments are specially provided to further illustrate the multicast method based on the representation and analysis route of the present invention, wherein the explanations of the technical terms involved are as follows:

Multicast identifier refers to a globally unique identifier that is independent of network address and can represent a multicast service; network address refers to network routable address information where the terminal is located, including but not limited to the use of IP addresses, etc. information.

Each port of the multicast processing node has an IP address, and we designate one of the IP addresses as the IP address of the multicast processing node, which represents the location information of the multicast processing node.

In the described embodiment, the multicast identifier is represented by EID (Entity ID), and the network address is represented by IP address. The multicast source 1 publishes the multicast service whose multicast identifier is EID1, and the mapping relationship between the multicast identifier EID1 and the network address IP2 of the multicast processing node 1 has been registered in the identification resolution service module. Among them, the multicast processing node 3 and the multicast processing node 4 are edge nodes of the network, which have the function of multicast protocol proxy.

As shown in Figure 6, multicast source 1 publishes a multicast service with the multicast identifier EID1, multicast receiver 2 has joined the multicast service through the multicast identifier EID1, multicast processing node 1, multicast processing node 2 and the multicast processing node 4 have registered the mapping between the multicast identifier EID1 and its network address with the identity resolution service module. The identity resolution service module maintains the mapping relationship between the multicast identifier EID1 and IP2, IP3, and IP7.

The multicast receiver 1 applies for joining the multicast service with the multicast identifier EID1 through the multicast identifier EID1. The multicast receiver 1 obtains the multicast group network address IPm1 corresponding to the multicast identifier EID1, and sends it to the local broadcast domain. Multicast membership report message containing the multicast identifier

The multicast member agent 1 receives the multicast member report message, maintains the mapping relationship between the multicast group network addresses IPm1 corresponding to the multicast identifier EID1, and constructs a join request message in the network layer message format Forwarding, which includes: the network address IP5 of the multicast member agent as the source network address, the network address IP4 of the multicast processing node 3 located at the network edge closest to the multicast member agent as the destination network address, and the multicast identifier EID1 , the multicast member proxy 1 sends the join request message to the multicast processing node 3 located at the network edge closest to the multicast member proxy;

The multicast processing node 3 receives the join request message sent by the multicast member agent 1, and sends a resolution request for the multicast identifier EID1 carried in the join request message to the identification resolution service module through the multicast protocol agent, and identifies the resolution service module. The module returns the network addresses IP2, IP3 and IP7 of a group of multicast processing nodes corresponding to the multicast identifier EID1. The multicast processing node 3 selects the multicast processing node 2 whose network address is IP3 as the target multicast processing node, modifies the destination network address in the join request message to the IP network address IP3 of the multicast processing node 2, and obtains the modified join The request message, the modified join request message is forwarded in the network layer message format, which includes: the source network address is the multicast group network address IP5 of the multicast member agent 1, and the destination network address is the network address of the multicast processing node 2. The address IP3 and the multicast identifier EID1; the multicast processing node 3 forwards the modified join request message to the multicast processing node 2;

As shown in FIG. 7 , the multicast processing node 2 receives the modified join request message, and determines that the destination IP address IP3 of the join request message is the IP address of the multicast processing node 2 . The multicast processing node 2 extracts the source network address IP5 and the multicast identifier EID1 in the join request message.

The multicast processing node 2 obtains the multicast identifier EID1 carried in the modified join request message by querying the locally maintained multicast forwarding table, and the multicast processing node 2, according to the source network address IP5 of the modified join request message, Query the local routing table and get forwarding port 2;

The multicast processing node 2 finds that the outgoing port list corresponding to the multicast identifier EID1 in the multicast forwarding table does not contain the forwarding port 2 obtained by the above query, and then adds the forwarding port 2 to the outgoing port list;

The multicast processing node constructs and replies a request-response message, the request-response message is forwarded in a network layer message format, which includes: the source network address is the network address IP3 of the multicast processing node 2, and the destination network address is the multicast member proxy 1's network address IP5 and multicast identifier EID1.

The multicast processing node 3 receives the request response message, extracts the multicast identifier EID1 and the destination network address IP5 from it, and finds the corresponding forwarding in the locally maintained routing table according to the destination network address IP5 carried in the request response message port 2;

The multicast processing node 3 queries whether the multicast forwarding table maintained locally contains the multicast identifier EID1 carried in the request response message,

The multicast processing node 3 does not find the multicast identifier EID1 in the locally maintained multicast forwarding table, then adds the multicast identifier EID1 and the above-mentioned forwarding port 2 in the multicast forwarding table, and registers it with the identification resolution service module The mapping relationship between the multicast identifier EID1 and the IP network address IP4 of the multicast processing node 3 becomes a multicast processing node that implements multicast corresponding to the multicast service. Forwarding port 2 forwards the request-response message to multicast member agent 1.

As shown in Figure 8, multicast source 1 generates and sends multicast data packets;

After receiving the multicast data packet, the multicast processing node 1 queries the locally maintained multicast forwarding table and obtains that the outgoing port corresponding to the multicast identifier EID1 carried in the multicast data packet is port 2. The packet is forwarded from port 2 to multicast processing node 2;

After receiving the multicast data packet, the multicast processing node 2 queries the locally maintained multicast forwarding table to obtain the outgoing ports corresponding to the multicast identifier EID1 carried in the multicast data packet as port 2 and port 3. Copy one multicast data message, obtain two multicast data messages, and forward the two multicast data messages from port 2 and port 3 to the corresponding multicast processing node 3 and multicast processing node 4 respectively;

After the multicast processing node 3 receives the multicast data packet, it queries the locally maintained multicast forwarding table and obtains that the outgoing port corresponding to the multicast identifier EID1 carried in the multicast data packet is port 2. Data packets are forwarded from port 2 to multicast member proxy 1;

After the multicast member agent 1 receives the multicast data packet, it changes the destination network address of the multicast data packet to the multicast group network address IPm1, and forwards it to the multicast receiver 1 in the way of IP multicast. Receiver 1 receives the multicast data packet;

After the multicast processing node 4 receives the multicast data packet, it queries the locally maintained multicast forwarding table and obtains that the outgoing port corresponding to the multicast identifier EID1 carried in the multicast data packet is port 2, and the multicast Data packets are forwarded from port 2 to multicast member agent 2;

After the multicast member agent 2 receives the multicast data packet, it changes the destination network address of the multicast data packet to the multicast group network address IPm1, and forwards it to the multicast receiver 2 in the way of IP multicast. Player 2 receives the multicast data packet.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention will not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the present invention. within the scope of the claims.

Claims (20)

1. A multicast system based on identification resolution routing, the system includes: a multicast source, a multicast receiver, a multicast member agent and a multicast processing node; it is characterized in that, the system further includes: deployed in the cloud or in the network The identification resolution service module is used to use a globally unique identifier unrelated to the network address as a multicast identifier, which can uniquely identify a multicast service, while the network address is still the address of the IP network;

   It is also used to maintain the mapping relationship between the multicast identifier and the IP network addresses of one or more multicast processing nodes;

   It is also used to provide registration, cancellation, and resolution query services;

   The network nodes that bear multicast include: multicast processing nodes and IP network routing switching nodes;

   The multicast receiver is used to apply for joining the multicast service through the multicast identifier.
2. The multicast system based on ID resolution routing according to claim 1, wherein the ID resolution service module is further configured to provide registration, deregistration, resolution query services; specifically:

   The identification resolution service module supports the registration and deregistration of the mapping relationship between the multicast identifier and the IP network addresses of one or more multicast processing nodes, and queries the IP network addresses of the multicast processing nodes through the resolution of the multicast identifier ; wherein, a multicast identifier corresponds to the IP network addresses of one or more multicast processing nodes.
3. The multicast system based on identification resolution routing according to claim 1, wherein the number of the multicast processing nodes is one or more, and is used to realize the function of the IP network routing switching node;

   It is also used to forward or process the modified join request message, determine whether the destination network address in the modified join request message is the network address of the currently received multicast processing node, and forward the modified join request message according to the judgment result. Or construct and forward request response messages;

   It is also used to encapsulate and send multicast data packets, and forward multicast data packets according to the updated, locally maintained multicast forwarding table;

   The multicast processing node located at the edge of the network adopts the multicast protocol proxy to modify the join request message sent by the multicast member proxy, and forwards the modified join request message to the selected multicast processing node.
4. The multicast system based on ID resolution routing according to claim 3, wherein the multicast processing node located at the edge of the network adopts a multicast protocol proxy to modify the join request message sent by the multicast member proxy, and The modified join request message is forwarded to the selected multicast processing node; the specific implementation process is as follows:

   The multicast processing node located at the edge of the network receives and processes the join request message based on the multicast identifier forwarded by the multicast member agent, sends a resolution request to the identification resolution service module, and parses the multicast identifier carried in the join request message. , obtain a group of multicast processing nodes corresponding to the multicast identifier carried in the join request message and their corresponding IP network addresses, select one of the multicast processing nodes, and modify the destination network address in the join request message to the selected one the IP address of the multicast processing node, obtain the modified join request message, and forward the modified join request message to the selected multicast processing node;

   Among them, by adopting the multicast protocol proxy, the modified join request message can also be constructed, encapsulated and sent.
5. The multicast system based on ID resolution routing according to claim 4, wherein the modified join request message is forwarded in a network layer packet format, which includes: source network address, destination network address and multicast identifier; wherein, the source network address is the IP network address of the multicast member proxy; the destination network address is the IP network address of a multicast processing node.
6. The multicast system based on identity resolution routing according to claim 3, wherein the multicast forwarding table comprises: a group of multicast forwarding table entries;

   Wherein, each multicast forwarding entry in the group of multicast forwarding entries further includes: a multicast identifier and an outgoing port list;

   Wherein, the outgoing port list further includes: multiple forwarding ports;

   The multicast identifier is a key, and the outgoing port list is a value; a multicast identifier corresponds to one or more forwarding ports.
7. The multicast system based on identification resolution routing according to claim 3, wherein the multicast processing node is used to forward or process the modified join request message, and determine the destination network in the modified join request message Whether the address is the network address of the currently received multicast processing node, and according to the judgment result, forward the modified join request message or construct and forward the request response message; the specific implementation process is as follows:

   The multicast processing node receives the modified join request message, and determines whether the destination network address carried in the modified join request message is the IP network address of the multicast processing node currently receiving the modified join request message;

   If the destination network address carried in the modified join request message is not the IP network address of the multicast processing node that currently receives the modified join request message, then according to the destination network address in the modified join request message, the IP network routing is performed. Forward to the correct multicast processing node;

   If the destination network address carried in the modified join request message is the network address of the multicast processing node that currently receives the modified join request message, update the local multicast forwarding table according to the modified join request message, and construct a Forward request response message.
8. The multicast system based on identity resolution routing according to claim 7, wherein the request response message is forwarded in a network layer message format, which includes: a source network address, a destination network address and a multicast identifier; Wherein, the source network address is the network address of the multicast processing node; the destination network address is the network address of the multicast member proxy.
9. The multicast system based on identification resolution routing according to claim 7, wherein, according to the modified join request message, the local multicast forwarding table is updated, and the request response message is constructed and forwarded, and the specific process is:

   The multicast processing node queries the locally maintained multicast forwarding table whether the multicast identifier carried in the modified join request message is included;

   If the multicast processing node finds the multicast identifier carried in the modified join request message in the local multicast forwarding table, then according to the source network address of the modified join request message, in the local routing table Query and get the forwarding port;

   Find out whether the forwarding port obtained by the above query is included in the outgoing port list corresponding to the multicast identifier in the multicast forwarding table;

   If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table does not contain the forwarding port obtained by the above query, add the forwarding port to the outgoing port list;

   If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table includes the forwarding port obtained by the above query, go to the next step:

   The multicast processing node constructs a request response message and a reply request response message, and the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent;

   If the multicast processing node does not query the local multicast forwarding table to include the multicast identifier carried in the modified join request message, the feedback is abnormal.
10. The multicast system based on identification resolution routing according to claim 9, wherein the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent; specifically for:

    The next multicast processing node receives the forwarded request-response message, extracts the multicast identifier and destination network address from it, and finds the corresponding forwarding in the locally maintained routing table according to the destination network address carried in the request-response message port;

    Query whether the multicast identifier carried in the request response message is included in the locally maintained multicast forwarding table;

    If the next multicast processing node finds the multicast identifier carried in the request response message in the locally maintained multicast forwarding table, it obtains the list of outgoing ports corresponding to the multicast identifier, and further determines the outgoing port. Whether the list contains the forwarding port;

    If there is the forwarding port in the outgoing port list, the request response message is directly forwarded from the forwarding port;

    If the forwarding port is not included in the outgoing port list, add the forwarding port in the outgoing port list, and directly forward the request response message from the forwarding port;

    If the next multicast processing node does not find the multicast identifier carried in the request response message in the local routing table, it will add the multicast identifier and the above forwarding port in the multicast forwarding table, and update the multicast forwarding published, and register the mapping relationship between the multicast identifier and the IP network address of the multicast processing node with the ID resolution service module, so as to become a multicast processing node corresponding to the multicast service, and the multicast processing node will Forward request-response messages from the above forwarding port until forwarded to the multicast member proxy.
11. The multicast system based on ID resolution routing according to claim 3, wherein the multicast data message includes a source network address, a destination network address and a multicast identifier; the source network address is for realizing multicast The network address of the multicast processing node in the network.
12. The multicast system based on identification resolution routing according to claim 11, wherein the multicast processing node is further configured to forward multicast data packets; its specific implementation process is:

    Query whether the multicast forwarding table maintained locally contains the multicast identifier carried in the multicast data packet;

    If the multicast forwarding table maintained locally contains the above-mentioned multicast identifier, all outgoing ports corresponding to the multicast identifier carried in the multicast data packet are obtained, and the multicast data packet is removed from the multicast forwarding table. All outgoing ports corresponding to the multicast identifier replicate the multicast data packet;

    If the multicast forwarding table does not contain the above-mentioned multicast identifier, error processing is performed, and the corresponding processing result is fed back.
13. The multicast system based on ID resolution routing according to claim 1, wherein, there are one or more multicast member agents, one or more multicast receivers, and the multicast member agents are associated with the group The multicast receiver is located in the same broadcast domain; the multicast member agent has a local local identifier, which is used for information exchange between the multicast receiver and the multicast member agent in the local broadcast domain;

    It is also used to maintain the mapping relationship between the multicast identifier and the local local identifier;

    It is also used to obtain the multicast member report message sent by the multicast receiver, construct the join request message according to the multicast member report message, and then send the constructed join request message to the multicast processing node;

    It is also used to obtain the multicast data message sent by the multicast processing node and forward it to the multicast receiver;

    Wherein, the local local identifier is unique in the local broadcast domain, which is specifically, but not limited to, an IP multicast group address.
14. A multicast method based on identification resolution routing, characterized in that the method is implemented based on the identification resolution routing based multicast system according to any one of the above claims 1-13, and the method includes:

    Step 1) The multicast receiver sends a multicast member report message with a multicast identifier to the multicast member agent, and the multicast member agent constructs a join request message according to the multicast member report message, and sends the constructed join request message To the nearest multicast processing node at the network edge, the multicast processing node modifies the join request message sent by the multicast member proxy through the multicast protocol proxy, and forwards the modified join request message to the correct multicast processing node;

    Step 2) The multicast processing node judges whether the destination network address of the received modified join request message is the network address of the currently received multicast processing node, and forwards the modified join request message or constructs and forwards the request according to the judgment result response message;

    Step 3) The multicast processing node updates the locally maintained multicast forwarding table according to the received request response message, and forwards the multicast data message to the multicast member agent according to the locally maintained multicast forwarding table.
15. The multicast method based on identity resolution routing according to claim 14, wherein the specific process of the step 1) is as follows:

    The multicast source publishes the multicast service with the multicast identifier, the multicast receiver applies for joining the multicast service with the multicast identifier through the multicast identifier, and sends a message containing the multicast identifier to the local broadcast domain. Multicast member report message;

    The multicast member agent receives the multicast member report message and constructs a join request message, and the multicast member agent sends the constructed join request message to the nearest multicast processing node located at the network edge,

    The multicast processing node located at the edge of the network receives the join request message forwarded by the multicast member agent, requests a query from the identification resolution service module, and obtains a group of multicast processing nodes corresponding to the multicast identifier carried in the join request message and their corresponding network address, select one of the multicast processing nodes, modify the destination network address in the join request message to the network address of the selected multicast processing node, obtain the modified join request message, and forward the modified request message to The selected multicast processing node.
16. The multicast method based on identity resolution routing according to claim 14, wherein the specific process of the step 2) is as follows:

    The multicast processing node receives the modified join request message, and determines whether the destination network address carried in the modified join request message is the network address of the multicast processing node currently receiving the modified join request message;

    If the destination network address carried in the modified join request message is not the network address of the multicast processing node that currently receives the modified join request message, then according to the destination network address in the modified join request message, IP network routing is performed. Forward until forwarded to the correct multicast processing node;

    If the destination network address carried in the modified join request message is the network address of the multicast processing node currently receiving the modified join request message, update the locally maintained multicast forwarding table according to the modified join request message, and construct And forward the request response message.
17. The multicast method based on identification resolution route according to claim 16, wherein, according to the modified join request message, the local multicast forwarding table is updated, and the request response message is constructed and forwarded, specifically:

    The multicast processing node inquires whether the multicast identifier carried in the modified join request message is included in the locally maintained multicast forwarding table;

    If the multicast processing node finds the multicast identifier carried in the modified join request message in the local multicast forwarding table, then according to the source network address of the modified join request message, in the local routing table Query and get the forwarding port;

    Find out whether the forwarding port obtained by the above query is included in the outgoing port list corresponding to the multicast identifier in the multicast forwarding table;

    If the forwarding port obtained by the above query is not included in the outgoing port list corresponding to the multicast identifier in the multicast forwarding table, the forwarding port is added to the outgoing port list;

    If the outgoing port list corresponding to the multicast identifier in the multicast forwarding table includes the forwarding port obtained by the above query, go to the next step:

    The multicast processing node constructs a request response message and a reply request response message, and the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until it is forwarded to the multicast member agent;

    If the multicast processing node does not find the multicast identifier carried in the modified join request message in the local multicast forwarding table, it will give an abnormal feedback.
18. The multicast method based on identification resolution route according to claim 17, wherein the next multicast processing node updates the multicast forwarding table according to the forwarded request response message until forwarded to the multicast member agent; Specifically:

    The next multicast processing node receives the forwarded request-response message, extracts the multicast identifier and destination network address from it, and finds the corresponding forwarding in the locally maintained routing table according to the destination network address carried in the request-response message port;

    Query whether the multicast identifier carried in the request response message is included in the locally maintained multicast forwarding table;

    If the next multicast processing node finds the multicast identifier carried in the request response message in the local multicast forwarding table, it obtains the list of outgoing ports corresponding to the multicast identifier, and further judges the list of outgoing ports. Whether to include the forwarding port;

    If there is the forwarding port in the outgoing port list, the request response message is directly forwarded from the forwarding port;

    If the forwarding port is not included in the outgoing port list, add the forwarding port in the outgoing port list, and directly forward the request-response message from the forwarding port;

    If the next multicast processing node does not find the multicast identifier carried in the request response message in the local multicast forwarding table, it will add the multicast identifier and the above forwarding port in the multicast forwarding table, and update the group broadcast forwarding table, and register the mapping relationship between the multicast identifier and the IP network address of the multicast processing node with the identification resolution service module, so as to become a multicast processing node corresponding to the multicast service, and the multicast processing node The request-response message is forwarded from the above forwarding port until it is forwarded to the multicast member proxy.
19. The multicast method based on identification resolution route according to claim 14, characterized in that, in the step 3), according to the multicast forwarding table maintained locally, the multicast data message is forwarded to the multicast member agent, and the specific The process is as follows:

    After receiving the multicast data message, the multicast processing node queries whether the multicast forwarding table maintained locally contains the multicast identifier carried in the multicast data message;

    If the multicast forwarding table maintained locally contains the above-mentioned multicast identifier, all outgoing ports corresponding to the multicast identifier carried in the multicast data packet are obtained, and the multicast data packet is removed from the multicast forwarding table. All outgoing ports corresponding to the multicast identifier replicate the multicast data packet,

    If the multicast forwarding table does not contain the above-mentioned multicast identifier, error processing is performed, and the corresponding processing result is fed back.
20. The method for multicast routing based on identification resolution according to claim 19, wherein the error handling comprises: discarding multicast data packets, feeding back error information to an upper-level multicast processing node, and sending multicast data to all adjacent multicast nodes. The processing node feeds back error information, updates the multicast forwarding table, and adds a multicast forwarding table entry corresponding to the multicast identifier carried in the multicast data message.

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