WO2010006524A1

WO2010006524A1 - Method of reliable multicast, superstratum provider apparatus and system

Info

Publication number: WO2010006524A1
Application number: PCT/CN2009/071467
Authority: WO
Inventors: 任翔; 凌义; 赵凤华; 吴迪; 赵诤; 段学罡; 覃剑宏
Original assignee: 华为技术有限公司
Priority date: 2008-07-18
Filing date: 2009-04-24
Publication date: 2010-01-21
Also published as: CN101321077B; CN101321077A

Abstract

A method of reliable multicast, a superstratum provider edge and a system are provided. The method comprises: establishing independent multicast path between the each SPE and the at least one UPE according to a multicast snooping protocol; setting in main-state or standby-state for all the SPE established multicast path with the same UPE and determining whether the main SPE works normally or not; transferring the multicast data to the UPE if normally; or transferring the multicast data to the UPE through the multicast path established between the standby SPE and the UPE if abnormally. Thereby the problem that the multicast path between the SPE and the UPE in the HVPLS lacks protecting could be solved.

Description

Reliable multicast method, carrier edge upper device and system

This application claims the priority of the Chinese application filed on July 18, 2008, the application number is 200810029573.1, and the invention is entitled "Reliable Multicast Method, Operator Edge Upper Device and System", the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method for reliable multicast, an operator edge upper layer device and system.

Background technique

As the demand for Virtual Private LAN Service (VPLS) grows, the number of fully connected channels between Carrier Edge Devices (PEs) needs to increase significantly. To meet the needs, the VPLS standard allows the use of a centralized star layout to create a hierarchical structure, Hierarchical Virtual Private LAN Service (HVPLS).

Referring to Figure 1, is a schematic structural diagram of a hierarchical virtual private network;

In the basic model of HVPLS, PE can be divided into two types:

Underlayer Provider Edge (UPE): Used to establish a connection with one of the PEs of the basic VPLS fully connected network 10. UPE11 supports routing and MPLS encapsulation, which is directly connected to the user edge device 12 (CE, Consumer Edge). If a UPE is connected to multiple CEs and has basic bridging functions, data frame forwarding only needs to be performed on the UPE, which reduces the burden on the carrier's edge upper device 13.

SPE (Superstratum Provider Edge): Used to connect UPEll and be located inside the basic VPLS fully connected network 10. The SPE13 is connected to other devices in the basic VPLS fully connected network 10.

Currently VPLS has been used more and more widely. However, when a traditional VPLS network faces a one-to-many situation, it usually uses a broadcast method, which not only wastes a lot of network bandwidth, but also causes a wide range. Broadcasting storms, but also affecting normal business. Multicast technology was created to solve such problems.

The IGMP Snooping (IGMP Snooping) technology is used to establish the multicast number operation by listening to the Internet Group Management Protocol (IGMP) message sent between the router and the host. By listening to the IGMP messages sent between the multicast router and the host, the IGMP Snooping router can know which ports have multicast data receivers. The multicast data packets will not be broadcast on the Layer 2 network. Multicast, that is, only multicast group members can receive multicast data packets.

With the expansion of network services and the gradual improvement of people's living standards, the stability and robustness of the network are becoming more and more important. Various services such as Multi-Protocol Label Switching (MPLS, Mul t i-Protocol Label Swi tching), Virtual Private Networks ( VPN, Vi r tua l Pr iva te Network ) The private line has its own protection measures to ensure uninterrupted business and protect the ultimate interests of users.

In the process of implementing the present invention, the inventors found that the prior art has the following disadvantages:

The existing IGMP Snooping supports only the PEs connected to the VPLS network and does not support the protection of the multicast path. Therefore, if the SPE fails or the propagation path is interrupted during the SPE transmission to the UPE, Corresponding protection measures will cause delays in the multicast data and even loss of multicast data.

Summary of the invention

The embodiment of the present invention provides a reliable multicast method, an operator edge upper layer device, and a system, which can solve the problem of lack of protection of the multicast path between the SPE and the UPE in the current HVPLS network, and is beneficial to improving the multicast service in the HVPLS network. Reliability.

The embodiment of the present invention provides a method for reliable multicast, which is applied to a network including at least one carrier edge lower layer device and at least two carrier edge upper layer devices, and the method includes:

According to the multicast listening protocol, an independent multicast path is established between each of the carrier edge upper layer devices and the at least one operator edge lower layer device;

All the operators side of establishing a multicast path with the same carrier edge lower layer device The upper-layer device performs the active/standby configuration.

Determine whether the upper-layer device at the edge of the active carrier is working properly;

When the active carrier edge upper layer device is working normally, the multicast data is forwarded to the carrier edge lower layer device by using the multicast path established by the active carrier edge upper layer device and the carrier edge lower layer device;

When the active carrier edge upper layer device works abnormally, the multicast data that is established by the backup carrier edge upper layer device and the carrier edge lower layer device forwards the multicast data to the carrier edge lower layer device.

Correspondingly, the embodiment of the present invention further provides an operator edge upper layer device of a multicast network, including:

a path maintenance module, configured to establish and maintain a multicast path with a device at a lower edge of the carrier according to the multicast listening protocol;

And an active/standby configuration module, configured to perform an active/standby configuration on the upper edge device of the carrier edge; and a data processing module, configured to receive, when the active/standby configuration module configures the upper edge device of the carrier edge as a primary device The multicast data is sent to the carrier edge lower layer device. When the active/standby configuration module configures the carrier edge upper layer device as a backup device, the multicast data is discarded.

Correspondingly, the embodiment of the present invention provides a reliable multicast network system, including: at least one carrier edge lower layer device and at least two carrier edge upper layer devices, where the at least two carrier edge upper layer devices include one The host uses the carrier edge upper layer device and at least one standby carrier edge upper layer device;

Each of the carrier edge upper layer devices is configured to establish an independent multicast path according to the multicast interception protocol with the at least one carrier edge lower layer device;

The active carrier edge upper layer device is configured to forward the received multicast data to the carrier edge lower layer device by using a multicast path established by the carrier and the carrier edge lower layer device. The standby carrier edge upper-layer device is configured to forward the multicast data to the operation by using a multicast path established by the carrier and the lower-layer device of the carrier edge when the upper-layer device of the active carrier edge is abnormal. Lower edge device.

Embodiments of the present invention have the following beneficial effects:

Multiple SPEs can establish a multicast path with the same UPE, and multiple SPEs connected to the same UPE can perform the primary and backup configurations. The multiple SPEs can be used as backup devices and the standby multicast path connected to the UPE is established. When the SPE device is faulty, the multicast data can be transmitted by the alternate multicast path established between the standby SPE and the UPE. This protects the multicast path used to transmit multicast data and improves the reliability of the multicast service.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the description of the claims Other drawings may also be obtained from these drawings without the use of creative labor.

1 is a schematic structural diagram of a hierarchical virtual private network;

2 is a schematic flowchart of a first embodiment of a reliable multicast method provided by the present invention; FIG. 3 is a schematic flowchart of a second embodiment of a reliable multicast method provided by the present invention; FIG. 5 is a schematic structural diagram of a first embodiment of a reliable multicast system provided by the present invention; FIG. 6 is a schematic structural diagram of a second embodiment of a reliable multicast system provided by the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 2, it is a schematic flowchart of a first embodiment of a reliable multicast method provided by the present invention. Ben The method for the reliable multicast provided by the embodiment of the present invention is applied to a network including at least one carrier edge lower layer device and at least two carrier edge upper layer devices, each of the carrier edge upper layer devices and the At least one carrier edge device is connected to the edge, and the method includes:

1 00, according to the multicast listening protocol, each of the carrier edge upper layer device and the at least one carrier edge lower layer device establish an independent multicast path; specifically, the carrier edge upper layer device runs The multicast listening protocol is used to learn which carrier edge lower layer devices can receive multicast services, thereby establishing an independent multicast path with the carrier edge lower layer device.

1 01. Performing active/standby configuration on all the edge devices of the carrier edge that establish a multicast path with the same edge device of the carrier;

1 02, judging whether the upper-layer device of the main operator is working normally; if the judgment result is yes, executing 1 03, if not, executing 1 04;

The multicast data is forwarded to the carrier edge lower layer device by using the multicast path established by the active carrier edge upper layer device and the carrier edge lower layer device;

The multicast data is forwarded to the carrier edge lower layer device by using the multicast path established by the standby carrier edge upper layer device and the carrier edge lower layer device.

The method for the reliable multicast provided by the embodiment of the present invention establishes a backup multicast path between the carrier edge upper layer device and the carrier edge lower layer device through the multicast listening protocol, thereby implementing protection for the carrier edge upper layer device and improving The reliability of the multicast service.

Referring to FIG. 3, it is a schematic flowchart of a second embodiment of a reliable multicast method provided by the present invention. The method is applied to a network including at least one UPE and at least two SPEs, and each SPE is connected to the UPE, and the method includes:

200. Each SPE broadcasts a query message, and queries which UPEs connected to it can receive the multicast service.

201. The UPE receives the query message broadcasted by each SPE, and responds to the response message according to the query message. Specifically, the UPE records the SPE sending port that sends the query message according to the received query message, and sends a response>3⁄4 file to the corresponding SPE through the SPE sending port. It should be noted that, if the UPE receives multiple query messages, it records each SPE sending port that sends the query message; and the multiple SPE sending ports have the same priority for the UPE; UPE The response is replied to the corresponding SPE through the corresponding SPE sending port.

202. A multicast path is established between the SPE that receives the response packet and the UPE that sends the response packet. The multicast path between the SPE record that received the response message and the UPE that sent the response message.

It should be noted that the multiple SPEs that receive the UPE response message record the multicast path with the UPE, and the multicast paths between the SPEs and the UPEs are independent of each other.

203. Perform active/standby configuration on all SPEs that establish a multicast path with the same UPE. Specifically, in the embodiment of the present invention, the SPE of the multicast path established with the same UPE may be configured in active/standby mode according to the Virtual Router Redundancy Protocol (VRRP), where one SPE is configured as the primary With SPE, the remaining SPEs are configured as standby SPEs.

204, determining whether the active SPE is working normally; if the determination is yes, then enter 206; if the determination is no, then go to 205;

205. When the 204 determines that the active SPE is working, the SPE performs the active/standby switchover according to the VRRP, and switches to the standby SPE, and the standby SPE takes over the active SPE.

206. The multicast data is forwarded to the UPE by using a multicast path established between the active SPE and the UPE. Specifically, after receiving the multicast data to be forwarded, the SPE determines whether the UPE that receives the multicast data is the primary SPE or the standby SPE;

If it is determined that it is the primary SPE of the UPE, the multicast data is sent to the UPE through the multicast path established between itself and the UPE; if it is determined to be the standby SPE of the UPE, it is discarded. The multicast data.

207. The UPE receives the multicast data sent by the SPE. It should be noted that the UPE does not distinguish the primary and secondary SPEs. As long as the data sent by the SPE sending port is recorded in step 201, the UPE receives the data normally.

The method for the reliable multicast provided by the embodiment of the present invention implements the backup of the multicast path between the carrier edge upper layer device and the carrier edge lower layer device through the multicast listening protocol; The protection of the upper-layer device at the edge of the commerce; the data redundancy received by the lower-layer device at the carrier edge is not increased, and the reliability of the multicast network is effectively improved.

The following describes the flow of the reliable multicast method provided by the third embodiment of the present invention in a reliable multicast system:

During the initial establishment of the network, SPE60 SPE602 and SPE603 form a fully-connected VPLS. In order to establish a multicast path with UPE608 and UPE609, SPE60 SPE602 and SPE603 broadcast queries.

After receiving the query message broadcasted by the SPE 602 and the SPE 603, the UPE 609 records the sending port of the SPE 602 and the SPE 603 that sent the Query message, and sends a response packet to the SPE 602 and the SPE 603 through the sending port.

After receiving the response packet from the UPE 608 and the UPE 609, the SPE 602 and the SPE 603 record the multicast path according to the packet. It should be noted that, because both the SPE 602 and the SPE 603 can receive the reply of the UPE 608 and the UPE 609, the SPE 602, SPE603 will establish multicast paths with both UPE608 and UPE609.

After the SPE 602, SPE 603, and UPE 608 have established the multicast path, the SPE 602 and the SPE 603 are configured as the active and standby SPE 602. The SPE 602 is the primary SPE of the UPE 608 and the SPE 603 is the standby SPE of the UPE 608. The multicast path between the SPE 602 and the UPE 608 . Then, the multicast path between the SPE 603 and the UPE 608 is the standby path 606.

After the SPE 602, the SPE 603, and the UPE 609 are connected to the UPE 609, the SPE 602 and the SPE 603 are configured as the primary SPE for the UPE 609. The SPE 603 is the primary SPE of the UPE 609 and the SPE 602 is the standby SPE of the UPE 608. The multicast path is the primary path 605; the multicast path between the SPE 602 and the UPE 609 is the alternate path 607.

It should be noted that this example is intended to illustrate that the active/standby configuration relationship between SPEs is only for a certain UPE. One SPE can belong to multiple UPE configuration instances at the same time, and is used as the primary SPE of a UPE. The standby SPE does not affect the SPE or the standby SPE of the other UPEs. This example is only a specific connection relationship of the present invention, and the present invention is not limited thereto. After In the above process, UPE608 and UPE609 both have two multicast paths connected to the SPE, and SPE602 and SPE603 also implement mutual backup.

When the multicast source 600 needs to send a set of multicast data to the CE 610 through the UPE 608, the SPE 601, the SPE 602, and the SPE 603 receive the multicast data sent by the multicast source 600. When the SPE 602 works normally, the SPE 603 is the backup of the UPE 608. The SPE selects to discard the multicast data, so there is no multicast data transmission on the alternate path 606. Only the SPE 602 forwards the multicast data to the UPE 608 through the primary path 604. After receiving the multicast data, the UPE 608 sends the multicast data to the SPE 602. CE610 forwarded.

When the multicast source 600 needs to send a set of multicast data to the CE 611 through the UPE 609, and the SPE 603 fails: SPE 601, SPE 602, and SPE 603 receive the multicast data sent by the multicast source 600, and the SPE 603 cannot pass the primary path 605 because of the fault. If the SPE 602 is the standby SPE of the UPE 609, the SPE 602 will replace the SPE 603 as the primary SPE of the UPE 609, and the SPE 602 will forward the multicast data to the UPE 609 through the alternate path 607. The UPE 609 receives the multicast. After the data, it is forwarded to CE611.

The method for the reliable multicast provided by the embodiment of the present invention ensures that the UPE still receives the multicast data in the case of the failure of the primary SPE, and improves the reliability of the multicast network, by the mutual backup between the SPEs and the establishment of the standby path. And security.

FIG. 4 is a schematic structural diagram of an operator edge upper layer device according to an embodiment of the present invention. The carrier's edge upper device specifically includes:

The path maintenance module 30 establishes and maintains a multicast path with the UPE according to the multicast listening protocol.

The active/standby configuration module 31 is configured to perform active/standby configuration on the device where the device resides.

The data processing module 32 is configured to: when the active/standby configuration module 31 configures the device in which the device is configured as the master device, the received multicast data is sent to the UPE; When it is a standby device, the multicast data is discarded.

The path maintenance module 30 specifically includes:

The packet sending and receiving unit 300 is configured to broadcast the query message and receive the UPE to reply to the query message. Answer message

The path maintenance unit 301 is configured to establish and maintain a multicast path between the SPE and the UPE that sends the response packet according to the response packet received by the packet sending and receiving unit 300. For a reply message of a UPE reply, if the packet sending and receiving unit 300 is received for the first time, the path maintenance unit 301 establishes a group between the SPE and the UPE according to the transmission path of the response message. If the response message of the UPE reply has been received before, the path maintenance unit 301 checks whether the previously established multicast path is changed, and maintains the multicast path; if the UPE of the multicast path has been previously established If the reply message expires, the path maintenance unit 301 deletes the multicast path between the previous SPE and the UPE.

The active/standby configuration module 31 specifically includes:

The active/standby configuration unit 31 0 is configured to perform active/standby configuration on the device according to VRRP.

It should be noted that each SPE can establish a multicast path with multiple UPEs. The active/standby relationship between multiple SPEs configured for active/standby configuration based on VRRP is only for the UPEs they are connected to. For other UPEs, The active/standby configuration does not take effect. For example, SPE1 is the primary SPE of UPE 1, and SPE2 is the standby SPE of the UPE1. It is valid only for UPE1. For UPE2, SPE2 is the primary SPE of the UPE2, and SPE1 is the primary SPE. The standby SPE of the UPE2; the above is only a specific case of the present invention, and is intended to indicate that the SPE does not affect the SPE as the primary SPE or the standby SPE of the UPE regardless of the APE. The SPE is used as the primary SPE or the standby SPE of the other UPEs; the active/standby switching unit 31 1 is configured to detect the working status of the SPE, and if the active/standby switching unit 31 1 detects the SPE working fault, and the SPE is The active/standby configuration unit 31 0 is configured as the primary SPE, and the active/standby switching unit 31 1 performs the active/standby switchover on the SPE, and switches the primary SPE to the standby SPE.

The data processing module 32 includes:

The status determining unit 320 is configured to determine whether the active/standby configuration module 31 configures the SPE as a primary device or a standby device. For a plurality of UPEs having a multicast path with the SPE, the SPEs are used as the primary SPE or the standby SPE of each UPE, respectively, for the data processing unit 321 to perform corresponding processing on the multicast data; The data processing unit 321 is configured to select to discard or forward the multicast data according to the determination result of the state determining unit 320. Specifically, after the data processing unit 321 receives the multicast data that needs to be forwarded, the state determining unit 320 determines the SPE. The master device sends multicast data to the UPE according to the multicast path maintained by the path maintenance module 30. If the state determining unit 320 determines that the SPE is a standby device, the multicast data is discarded.

In the carrier edge upper layer device provided by the embodiment of the present invention, multiple SPEs are connected to the same UPE to establish an alternate path between the SPE and the UPE, thereby improving multicast security and reliability.

Referring to FIG. 5, it is a schematic structural diagram of a first embodiment of a reliable multicast system provided by the present invention. As shown in FIG. 5, the reliable multicast system provided by the embodiment of the present invention includes at least one carrier edge lower layer device (UPE) 52 and at least two carrier edge upper layer devices (SPEs) 50, 51, at least two The SPE includes a primary SPE 50 and at least one standby SPE 51. Each SPE 50 and 51 is configured to establish an independent multicast path with at least one UPE 52 according to the multicast listening protocol, and the primary SPE 50 is used to work normally. The multicast data is forwarded to the UPE 52 by the multicast path established by the user and the UPE 52. The standby SPE 51 is configured to use the multicast path established by the self and the UPE 52 when the active SPE 50 is abnormal. Forward to UPE52. Each SPE 50, 51 further includes:

a path maintenance module, configured to establish and maintain a multicast path with the carrier edge lower layer device 52 according to the multicast listening protocol;

An active/standby configuration module is used to perform active/standby configuration on the SPE.

The data processing module is configured to send the received multicast data to the UPE52 when the active/standby configuration module configures the SPE as the primary device, and discards the SPE configured as the standby device when the active/standby configuration module is configured as the standby device. The multicast data.

The SPE 50 and 51 perform the active/standby configuration according to VRRP and independently maintain the multicast path between the SPE 50 and the UPE 52.

When the primary SPE 50 fails, the standby SPE 51 continues to send multicast data according to the multicast path between itself and the UPE 52 according to the VRRP. The UPE52 records the sending ports of all the primary SPEs 50 and the standby SPEs 51. After the active/standby switchover of the upper-layer devices at the edge of the carrier, the multicast forwarding port continues to receive multicast data from the standby SPE51.

In the reliable multicast system provided by the embodiment of the present invention, when the primary SPE is faulty, the standby SPE can take over the active SPE and continue to send multicast data to the UPE to ensure normal forwarding of the multicast data.

Referring to FIG. 6, a schematic structural diagram of a second embodiment of a reliable multicast system provided by the present invention is shown. The carrier edge upper layer device 601 (SPE601), the carrier edge upper layer device 602 (SPE602), and the carrier edge upper layer device 603 (SPE603) form a fully connected VPLS in the initial establishment phase of the network, and respectively broadcast query messages to establish A multicast path between the carrier edge lower layer device 608 (UPE 608) and the carrier edge lower layer device 609 (UPE 609).

After receiving the query message broadcasted by the SPE 602, the UPE 609 sends a response message to the SPE 602 through the sending port of the SPE 602 according to the opposite path of the query message. Similarly, the UPE 608 and the UPE 609 receive the query message broadcast by the SPE 603. The response packet is sent to the SPE 603 through the sending port of the SPE 603 according to the opposite path of the queried message.

SPE 602 and SPE 603 establish and record the multicast path according to the received UPE 608 and UPE 609 responses. It should be noted that both SPE 602 and SPE 603 can receive the response of UPE 608 and UPE 609, so SPE 602 and SPE 603 will both respond. At the same time, a multicast path is established with UPE608 and UPE609.

After SPE602, SPE603, and UPE608 complete the establishment of the multicast path, the primary and backup configurations are performed according to VRRP. Assume that SPE602 is the primary SPE of UPE608 and SPE603 is the standby SPE of UPE608. The multicast path between SPE602 and UPE608 is the primary. With the path 604; the multicast path between the SPE 603 and the UPE 608 is the alternate path 606.

After SPE602, SPE603, and UPE609 establish a multicast path, SPE 602 and SPE 603 perform the primary and backup configurations for the UPE VR. The SPE 603 is the primary SPE of the UPE 609 and the SPE 602 is the standby SPE of the UPE 608. The multicast between the SPE 603 and the UPE 609 . The path is the primary path 605; the multicast path between the SPE 602 and the UPE 609 is the alternate path 607.

It should be noted that this example is intended to illustrate that the active/standby configuration relationship between SPEs is only for a certain UPE. In this case, an SPE can belong to a configuration instance of multiple UPEs at the same time, and it does not affect the SPE or the standby SPE of the other UPEs when it is used as the primary SPE or the standby SPE of a certain UPE. It is only one specific connection relationship of the present invention, and the present invention is not limited thereto. After the above process, UPE608 and UPE609 both have two multicast paths connected to the SPE, and the SPE602 and SPE603 also implement mutual backup.

SPE60 SPE602, SPE603 receives the multicast data sent by the multicast source 600 to the CE61 0. After the SPE 602 works normally, the SPE 603 is the standby SPE of the UPE 608 and chooses to discard the multicast data. No multicast data is transmitted; only the SPE 602 forwards the multicast data to the UPE 608 through the primary path 604. After receiving the multicast data, the UPE 608 forwards the data to the CE 61 0.

When the multicast source 600 sends the multicast data to the SPE 601, the SPE 602, and the SPE 603, the SPE 603 fails. The SPE 603 fails to forward the multicast data through the primary path 605 because the fault occurs. As the standby SPE of the UPE 609, the SPE 602 will replace the SPE 603 as the primary SPE of the UPE 609. The SPE 602 will forward the multicast data to the UPE 609 through the alternate path 607. After receiving the multicast data, the UPE 609 forwards the data to the CE 61 1 .

It should be noted that, in the embodiment of the present invention, the virtual private network traffic control technology (VPLS over TE) may be combined, and the multicast path between the SPE and the UPE is established on the tunnel (Tunnel), and the tunnel protection technology is utilized. Tunne l Pro tec t) further protects the multicast path.

In the embodiment of the present invention, a backup multicast path between the SPE and the UPE is established by using the multicast packet between the SPE and the UPE. The primary and backup configurations between the SPEs are used to implement mutual backup between the SPEs and improve the multicast network. reliability.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary hardware platform, and of course, all can be implemented by hardware. Implementation. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The above is only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the claims of the present invention are still within the scope of the present invention.

Claims

Claim

A method for reliable multicast, which is applied to a network including at least one carrier edge lower layer device and at least two carrier edge upper layer devices, wherein the method includes:

Performing active/standby configuration on all the carrier edge upper-layer devices that establish a multicast path with the same carrier edge lower-layer device;

The method of claim 1, wherein the method according to the multicast listening protocol is between each of the carrier edge upper layer devices and the at least one carrier edge lower layer device. Establish independent multicast paths, including:

The carrier edge lower layer device receives an inquiry message broadcasted by each of the carrier edge upper layer devices, and records, according to the query message, the carrier edge upper layer device sending port that sends the query message;

The carrier edge lower layer device sends a response message to the corresponding carrier edge upper layer device through the carrier edge upper layer device sending port;

A multicast path is established between the carrier edge upper layer device that receives the response message and the carrier edge lower layer device that sends the response message, and records a multicast path with the carrier edge lower layer device.

The method for reliable multicast according to claim 2, wherein: according to the multicast listening protocol, each of the operator edge upper layer devices and the at least one carrier edge lower layer device Establish independent multicast paths between each other, including:

If the carrier edge device receives the plurality of query messages, the carrier sends the port to the upper edge device of each carrier edge that sends the query message; and the multiple carrier edge upper device sends the port to the operation. Lower edge devices have the same priority;

The carrier edge device sends a port reply response packet to the corresponding carrier edge upper device through the corresponding carrier edge upper device according to the opposite path of the received multiple query packets. The carrier edge lower layer device response is received. The multi-carrier edge upper-layer device of the response 艮建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立建立

The method for the reliable multicast according to claim 3, wherein the group established by the upper-layer device of the active carrier and the lower-layer device of the carrier edge when the upper-layer device of the active carrier edge is working normally The broadcast path forwards the multicast data to the lower-layer device of the carrier edge, including: After receiving the multicast data to be forwarded, the upper-layer device at the edge of the carrier determines that it is the master of the carrier edge device that receives the multicast data. Use the carrier edge upper device or the standby carrier edge upper device;

If it is determined that it is the active carrier edge upper layer device of the carrier edge lower layer device, the multicast data is sent to the multicast path through the multicast path established by the active carrier edge upper layer device and the carrier edge lower layer device. The carrier's edge lower device;

If it is determined that it is the standby carrier edge upper layer device of the carrier edge lower layer device, the multicast data is discarded.

The method for reliable multicast according to claim 4, wherein when the upper-layer device of the active carrier edge is abnormal, the upper-layer device at the edge of the standby carrier and the lower edge of the carrier are The multicast path established by the device forwards the multicast data to the lower edge device of the carrier edge, including:

When the upper-layer device at the edge of the active carrier is abnormal, one of the upper-layer devices at the edge of the standby carrier is re-elected as the upper-level device of the new active carrier, and the upper-layer device is passed through the edge of the new active carrier. Multicast path established between the device and the lower edge device of the carrier edge, multicast The data is sent to the carrier edge lower layer device.

The method for the reliable multicast according to claim 1, wherein the master and the upper edge devices of all the operators that establish a multicast path with the same carrier edge lower layer device perform the primary and secondary devices. Configuration, also includes:

Among all the operators' edges that establish a multicast path with the same carrier's lower-layer devices, except for one carrier edge upper-layer device is configured as the primary carrier edge upper-layer device, and the remaining carrier edge upper-layer devices are all Configured as an alternate carrier edge upper device.

A carrier edge upper layer device of a multicast network, comprising: a path maintenance module, configured to establish and maintain a multicast path with a carrier edge lower layer device according to a multicast listening protocol;

8. The carrier edge upper layer device of the multicast network according to claim 7, wherein the path maintenance module comprises:

a packet sending and receiving unit, configured to broadcast a query message, and receive a response message from the lower edge device of the carrier to reply the query message;

The path maintenance unit is configured to establish and maintain a multicast path between the carrier edge upper layer device and the carrier edge lower layer device that sends the response message according to the response message received by the packet sending and receiving unit.

9. The carrier edge upper layer device of the multicast network according to claim 7, wherein the active/standby configuration module comprises:

An active/standby configuration unit, configured to perform, on a carrier edge upper layer device according to a virtual routing redundancy protocol Perform the active and standby configurations.

And an active/standby switching unit, configured to detect an operating state of the upper-layer device of the carrier edge; if the operation of the upper-layer device of the carrier edge is detected, and the device at the edge of the carrier is configured by the active/standby configuration unit The active/standby switchover unit is configured to perform active/standby switchover on the edge device of the carrier edge, and switch the upper edge device of the active carrier edge to the upper edge device of the standby carrier edge.

10. The carrier edge upper layer device of the multicast network according to claim 7, wherein the data processing module comprises:

a state determining unit, configured to determine, by the active/standby configuration module, whether the carrier edge upper layer device is configured as a primary device or a standby device;

a data processing unit, configured to discard or forward the multicast data according to the judgment result of the state determining unit;

If the state determining unit determines that the carrier edge upper layer device is the master device, the multicast data is sent to the carrier edge lower layer device according to the multicast path maintained by the path maintenance module; The standby device discards the multicast data.

11. A reliable multicast network system, wherein the reliable multicast network system comprises:

At least one carrier edge lower layer device and at least two carrier edge upper layer devices, the at least two carrier edge upper layer devices include one active carrier edge upper layer device and at least one standby carrier edge upper layer device;

The active carrier edge upper layer device is configured to forward the received multicast data to the carrier edge lower layer device by using a multicast path established by the carrier and the carrier edge lower layer device.

The standby carrier edge upper-layer device is configured to: when the upper-layer device of the active carrier edge is abnormal, use the multicast path established by the carrier and the lower-layer device of the carrier edge to set the multicast number. It is forwarded to the lower edge device of the carrier.

The reliable multicast network system according to claim 11, wherein each of the operator edge upper layer devices is the carrier edge upper layer device according to any one of claims 7 to 10.