(19)
(11)EP 3 687 131 A1

(12)EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(43)Date of publication:
29.07.2020 Bulletin 2020/31

(21)Application number: 17928191.0

(22)Date of filing:  13.10.2017
(51)International Patent Classification (IPC): 
H04L 29/06(2006.01)
H04L 12/707(2013.01)
H04L 12/931(2013.01)
H04L 12/437(2006.01)
H04L 12/761(2013.01)
H04L 12/703(2013.01)
H04L 12/18(2006.01)
(86)International application number:
PCT/CN2017/106113
(87)International publication number:
WO 2019/071585 (18.04.2019 Gazette  2019/16)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(71)Applicant: Huawei Technologies Co., Ltd.
Longgang District Shenzhen, Guangdong 518129 (CN)

(72)Inventors:
  • MENG, Li
    Shenzhen, Guangdong 518129 (CN)
  • LI, Weiguo
    Shenzhen, Guangdong 518129 (CN)
  • MENG, Wanhong
    Shenzhen, Guangdong 518129 (CN)
  • GAO, Meng
    Shenzhen, Guangdong 518129 (CN)

(74)Representative: Maiwald Patent- und Rechtsanwaltsgesellschaft mbH 
Elisenhof Elisenstraße 3
80335 München
80335 München (DE)


(56)References cited: : 
  
      


    (54)METHOD, APPARATUS AND SYSTEM FOR RAPIDLY RESTORING SERVICE DURING PATH SWITCHING


    (57) Embodiments of this application provide a fast service restoration method in a path switching process, a device, and a system. The method includes: sending, by a first device, multicast control packets to a second device and a third device through a first interface and a second interface respectively, where the multicast control packet carries a transparent transmission identifier, a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, the multicast control packets are sent to a multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established. In the embodiments of this application, the multicast control packet can penetrate a blocked node and be sent to the multicast server, so that the first device can establish the negotiation of the service protocol with the multicast server and establish a forwarding entry in advance. When the blocked node is unblocked, the first device can receive, over a normal path, a multicast service packet delivered by the multicast server. This greatly quickens restoration of a multicast service.




    Description

    TECHNICAL FIELD



    [0001] This application relates to the field of communications technologies, and in particular, to a fast service restoration method in a path switching process, a device, and a system.

    BACKGROUND



    [0002] In a typical ring network topology, each switch of a network system is connected to exactly two other switches, physically forming a ring network structure. It can be learned from a broadcast domain of a layer 2 switching network that a physical ring causes a broadcast storm. Therefore, the ring network control protocol needs to be run to selectively block some ports and finally prune the ring network structure into a loop-free tree network structure. This prevents a packet from continuously replicating and infinitely circulating on a ring network, and avoids reduction in a packet processing capability of a switch caused by repeatedly receiving a same packet.

    [0003] In addition to the ring network protection protocol, a link management protocol such as the link aggregation control protocol (Link Aggregation Control Protocol, LACP), the Ethernet ring protection switching (Ethernet ring protection switching, ERPS) protocol, the protection switching (Protect Switch, PS) protection group protocol, or the enhanced trunk (Enhanced Trunk, Etrunk) protocol sets service path blocking. In blocking, a multicast control packet and a multicast service packet are discarded, and only a link management protocol packet of the LACP, ERPS, PS protection group, or Etrunk is allowed to pass. A blocking action of the ring network protocol discards the multicast control packet, so that when blocking is canceled, the multicast control packet needs to be renegotiated. Consequently, service restoration takes a long time and user experience is poor.

    SUMMARY



    [0004] Embodiments of this application provide a fast service restoration method in a path switching process, a device, and a system. A multicast control packet can penetrate a blocked node and be sent to a multicast server. When the node is unblocked, a first device has established negotiation of a service protocol with the multicast server and established a forwarding entry. This greatly quickens restoration of a multicast service and improves user experience.

    [0005] According to a first aspect, an embodiment of this application provides a fast service restoration method in a path switching process, including: in a scenario of a ring network or a plurality of forwarding paths, sending, by a first device, multicast control packets to a second device and a third device through a first interface and a second interface respectively, where the multicast control packet carries a transparent transmission identifier, a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, both the second device and the third device are connected to a multicast server, the multicast control packets are sent to the multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established; and after the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, receiving, by the first device, over a first path or a second path, a multicast service packet delivered by the multicast server. This greatly quickens restoration of a multicast service, and a user does not experience a service switching latency.

    [0006] In an implementation, the fast service restoration method in the path switching process includes: after receiving the multicast control packet, determining, by the second device or the third device, whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmitting the multicast control packet to the multicast server.

    [0007] In an implementation, before the sending multicast control packets to a second device and a third device through a first interface and a second interface respectively, the method further includes: receiving multicast packets and identifying the multicast control packet; and adding a user-defined penetration identifier to the multicast control packet.

    [0008] In an implementation, the fast service restoration method in the path switching process further includes: replicating the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.

    [0009] In an implementation, before the multicast control packets are sent to the multicast server through the ports of the second device and the third device, the method further includes: sending, by the second device, the multicast control packet to a fourth device; and sending, by the third device, the multicast control packet to a fifth device; where the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server. According to a second aspect, an embodiment of this application provides a device. The device is connected to a second device and a third device through a first interface and a second interface respectively, where a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, and both the second device and the third device are connected to a multicast server; and the device includes:

    a sending unit, configured to send multicast control packets to the second device and the third device through the first interface and the second interface respectively, where the multicast control packet carries a transparent transmission identifier, the port of at least one of the second device and the third device is in the blocked state controlled by the ring network protocol, both the second device and the third device are connected to the multicast server, the multicast control packets are sent to the multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established; and

    a receiving unit, configured to: after the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, receive, over a first path or a second path, a multicast service packet delivered by the multicast server.



    [0010] In an implementation, after receiving the multicast control packet, the second device or the third device determines whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmits the multicast control packet to the multicast server.

    [0011] In an implementation, before the sending unit sends the multicast control packets to the second device and the third device through the first interface and the second interface respectively, the receiving unit is further configured to receive multicast packets and identify the multicast control packet; and add a user-defined penetration identifier to the multicast control packet.

    [0012] In an implementation, the processing unit is further configured to replicate the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.

    [0013] In an implementation, before the multicast control packets are sent to the multicast server through the ports of the second device and the third device, the second device sends the multicast control packet to a fourth device, and the third device sends the multicast control packet to a fifth device; where the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server.

    [0014] According to a third aspect, an embodiment of this application provides a multicast system. The system includes a first device, a second device, a third device, and a voice multicast server, where the first device is connected to the second device and the third device through a first interface and a second interface respectively, a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, and both the second device and the third device are connected to the multicast server; and
    the first device sends multicast control packets to the second device and the third device through the first interface and the second interface respectively, where the multicast control packet carries a transparent transmission identifier, the port of at least one of the second device and the third device is in the blocked state controlled by the ring network protocol, and both the second device and the third device are connected to the multicast server, the multicast control packets are sent to the multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established; and after the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, the first device receives, over a first path or a second path, a multicast service packet delivered by the multicast server.

    [0015] In an implementation, after receiving the multicast control packet, the second device or the third device determines whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmits the multicast control packet to the multicast server.

    [0016] In an implementation, before sending the multicast control packets to the second device and the third device through the first interface and the second interface respectively, the first device is further configured to: after receiving multicast packets, identify the multicast control packet and add a user-defined penetration identifier to the multicast control packet.

    [0017] In an implementation, the first device is further configured to replicate the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.

    [0018] In an implementation, before the multicast control packets are sent to the multicast server through the ports of the second device and the third device,
    the second device sends the multicast control packet to a fourth device, and the third device sends the multicast control packet to a fifth device; where the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server.

    [0019] According to a fourth aspect, an embodiment of this application provides a device, including a processor, a memory, a bus, and a communications interface. The memory is configured to store a computer-executable instruction. The processor and the memory are connected by using the bus. When the device runs, the processor executes the computer-executable instruction stored in the memory, to perform the foregoing method. In conclusion, in the embodiments of this application, the penetration identifier is added to the multicast control packet, so that the multicast control packet can penetrate the blocked node and be sent to the multicast server, and the first device can establish the negotiation of the service protocol with the multicast server and establish the forwarding entry in advance. When the blocked node is unblocked, the first device can receive, over a normal path, the multicast service packet delivered by the multicast server. A user does not experience a service switching latency. This greatly quickens restoration of a multicast service and improves user experience.

    BRIEF DESCRIPTION OF DRAWINGS



    [0020] 

    FIG. 1 is a schematic block diagram of an application scenario of a technical solution according to an embodiment of this application;

    FIG. 2 is a schematic block diagram of an application scenario of a technical solution according to an embodiment of this application;

    FIG. 3 is a flowchart of a fast service restoration method in a path switching process according to an embodiment of this application;

    FIG. 4 is a flowchart of another fast service restoration method in a path switching process according to an embodiment of this application;

    FIG. 5A and FIG. 5B are schematic block diagrams of a device according to an embodiment of this application;

    FIG. 6 is a schematic block diagram of a system according to an embodiment of this application; and

    FIG. 7 is a schematic block diagram of a communications device according to an embodiment of this application.


    DESCRIPTION OF EMBODIMENTS



    [0021] The following describes technical solutions of this application with reference to accompanying drawings.

    [0022] FIG. 1 and FIG. 2 are schematic block diagrams of an application scenario of a technical solution according to an embodiment of this application. As shown in FIG. 1 and FIG. 2, in a scenario of a ring network or a plurality of forwarding paths, a device (Device) A sends multicast control packets to two ports (API and A P2) respectively, and the multicast control packet passing through a device B can be successfully forwarded to a multicast server. In addition, the multicast control packet passing through a device C can also penetrate blocking specified by a ring network protocol and finally reach the multicast server. For both the paths in the figure, the multicast control packets reach the server, and a forwarding entry is established. The multicast server simultaneously forwards video packets over the two paths. The multicast service packet passing through the device B is finally sent to the device A, while the multicast service packet destined for the device C is discarded due to the blocking specified by the ring network protocol. The device A receives only one multicast service packet.

    [0023] The ring network protocol controls a blocking point to change, so that a forwarding path is switched, and PI of the device C is unblocked. Because the forwarding entry has been established, the multicast service packet is immediately forwarded to the device A. Without time spent on negotiation of a service protocol and entry establishment, time spent on path switching includes only time spent on blocking reconfiguration of the ring network protocol and link protection. A user does not experience a service switching latency. This greatly quickens restoration of a multicast service and improves user experience.

    [0024] It should be noted that there may be a plurality of ring network protocols, for example, the spanning tree protocol (Spanning Tree Protocol, STP) and various improved spanning tree protocols based on the STP, or the link aggregation group (Spanning Tree Protocol, LAG) protocol, the Ethernet ring protection switching (Ethernet Ring Protection Switching, ERPS) protocol, or the enhanced trunk (Enhanced Trunk, Etrunk) protocol that set blocking. This is not limited in this embodiment of this application. Optionally, the device in this embodiment of this application may be a core router (Core Router, CR), a broadband remote access server (Broadband Remote Access Server, BRAS), a LAN switch (LAN Switch, LSW), an optical line terminal (Optical Line Terminal, OLT), a home gateway (Home Gateway, HG), or the like. This is not limited in this embodiment of this application.

    [0025] FIG. 3 is a flowchart of a fast service restoration method in a path switching process according to an embodiment of this application. The method includes the following steps:

    S301: A first device sends multicast control packets to a second device and a third device through a first interface and a second interface respectively, where the multicast control packet carries a transparent transmission identifier, a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, both the second device and the third device are connected to a multicast server, and the multicast control packets are sent to the multicast server through ports of the second device and the third device.

    S302: The multicast server establishes negotiation of a service protocol with the first device, and a forwarding entry is established.

    S303: After the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, the first device receives, over a first path or a second path, a multicast service packet delivered by the multicast server. In step S303, as shown in FIG. 2, the ring network protocol controls a blocking point to change, so that a forwarding path is switched, and P1 of the device C is unblocked. Because the forwarding entry has been established, the multicast service packet delivered by the multicast server is immediately forwarded to the device A through the device B.



    [0026] In this embodiment of this application, a penetration identifier is added to the multicast control packet, so that the multicast control packet can penetrate a blocked node and be sent to the multicast server, and the first device can establish negotiation of a service protocol with the multicast server and establish a forwarding entry in advance. When the blocked node is unblocked, the first device can receive, over a normal path, the multicast service packet delivered by the multicast server. A user does not experience a service switching latency. This greatly quickens restoration of a multicast service and improves user experience.

    [0027] FIG. 4 shows a fast service restoration method in a path switching process according to an embodiment of this application. The method includes the following steps:

    S401: A first device receives multicast packets and identifies a multicast control packet; and adds a user-defined penetration identifier to the multicast control packet.

    S402: The first device replicates the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.

    S403: The first device sends the multicast control packets to a second device and a third device through a first interface and a second interface respectively, where the multicast control packet carries a transparent transmission identifier, a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, both the second device and the third device are connected to a multicast server, and the multicast control packets are sent to the multicast server through ports of the second device and the third device.

    S404: After receiving the multicast control packet, the second device or the third device determines whether the multicast control packet carries the transparent transmission identifier; if the multicast control packet carries the transparent transmission identifier, proceed to step S405; if the multicast control packet does not carry the transparent transmission identifier, proceed to step S406.

    S405: Transparently transmit the multicast control packet to the multicast server.

    S406: Discard the multicast control packet.

    S407: The multicast server establishes negotiation of a service protocol with the first device, and a forwarding entry is established.

    S408: After the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, the first device receives, over a first path or a second path, a multicast service packet delivered by the multicast server. The foregoing is merely an example for description. In another possible implementation, the second device may further send the multicast control packet to a fourth device, and the third device may further send the multicast control packet to a fifth device. The fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server. The fourth device and the fifth device receive the multicast control packets and further send the multicast control packets to the multicast server.



    [0028] In this embodiment of this application, the penetration identifier is added to the multicast control packet, so that the multicast control packet can penetrate a blocked node and be sent to the multicast server, and the first device can establish negotiation of a service protocol with the multicast server and establish a forwarding entry in advance. When the blocked node is unblocked, the first device can receive, over a normal path, the multicast service packet delivered by the multicast server. A user does not experience a service switching latency. This greatly quickens restoration of a multicast service and improves user experience.

    [0029] As shown in FIG. 5A, according to a second aspect, an embodiment of this application provides a device. The device is connected to a second device and a third device through a first interface and a second interface respectively, where a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, and both the second device and the third device are connected to a multicast server. The device 500 includes:

    a sending unit 501, configured to send multicast control packets to the second device and the third device through the first interface and the second interface respectively, where the multicast control packet carries a transparent transmission identifier, the port of at least one of the second device and the third device is in the blocked state controlled by the ring network protocol, both the second device and the third device are connected to the multicast server, the multicast control packets are sent to the multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established; and

    a receiving unit 502, configured to: after the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, receive, over a first path or a second path, a multicast service packet delivered by the multicast server.



    [0030] Specifically, there may be two cases. In a first case, for packets directly forwarded by hardware, the first device adds a penetration identifier to a multicast control packet that is expected to perform penetration, and after the multicast control packet is sent to the second device and the third device, the second device and the third device identify the multicast control packet by using an existing packet parsing module, and deliver the multicast control packet to a packet processing module. The packet processing module performs the following determining: In a blocked state, a multicast control packet having the penetration identifier is allowed to continue to be forwarded, and a multicast control packet having no penetration identifier is directly discarded; in an unblocked state, all packets can be forwarded.

    [0031] In a second case, for packets that are sent to and forwarded by CPU software, the second device and the third device identify a multicast control packet by using an existing packet parsing module, and deliver the multicast control packet to a software packet processing module. The software packet processing module performs the following determining: In a blocked state, a packet having a penetration identifier is allowed to continue to be forwarded by the CPU software, and the packet having no penetration identifier is directly discarded; in an unblocked state, all packets continue to be forwarded by the CPU software.

    [0032] In an implementation, after receiving the multicast control packet, the second device or the third device determines whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmits the multicast control packet to the multicast server.

    [0033] In an implementation, as shown in FIG. 5B, the device 500 further includes a processing unit 503. Before the sending unit sends the multicast control packets to the second device and the third device through the first interface and the second interface respectively, the receiving unit is further configured to receive multicast packets, identify the multicast control packet, and send the multicast packets to the processing unit 503. The processing unit 503 identifies the multicast control packet and adds a user-defined penetration identifier to the multicast control packet. In an implementation, the processing unit 503 is further configured to replicate the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets. Then the plurality of multicast control packets are sent to the second device and the third device.

    [0034] The foregoing is merely an example for description. In another possible implementation, before the multicast control packets are sent to the multicast server through the ports of the second device and the third device, the second device sends the multicast control packet to a fourth device, and the third device sends the multicast control packet to a fifth device; where the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server.

    [0035] As shown in FIG. 6, an embodiment of this application provides a multicast system. The system includes a first device 601, a second device 602, a third device 603, and a voice multicast server 604. The first device 601 is connected to the second device 602 and the third device 603 through a first interface and a second interface respectively. A port of at least one of the second device 602 and the third device 603 is in a blocked state controlled by a ring network protocol. Both the second device 602 and the third device 603 are connected to the multicast server 604.

    [0036] The first device 601 sends multicast control packets to the second device 602 and the third device 603 through the first interface and the second interface respectively. The multicast control packet carries a transparent transmission identifier. The multicast control packets are sent to the multicast server 604 through ports of the second device 602 and the third device 603, negotiation of a service protocol is established with the multicast server 604, and a forwarding entry is established. After the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, the first device 601 receives, over a first path or a second path, a multicast service packet delivered by the multicast server 604.

    [0037] Optionally, after receiving the multicast control packet, the second device 602 or the third device 603 determines whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmits the multicast control packet to the multicast server.

    [0038] Optionally, before sending the multicast control packets to the second device 602 and the third device 603 through the first interface and the second interface respectively, the first device 601 is further configured to: after receiving multicast packets, identify the multicast control packet and add a user-defined penetration identifier to the multicast control packet.

    [0039] Optionally, the first device 602 is further configured to replicate the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.

    [0040] Optionally, before the multicast control packets are sent to the multicast server 604 through the ports of the second device 602 and the third device 603, the second device 602 sends the multicast control packet to a fourth device (not shown in the figure), and the third device sends the multicast control packet to a fifth device (not shown in the figure); where the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server. The fourth device and the fifth device receive the multicast control packets and further send the multicast control packets to the multicast server.

    [0041] As shown in FIG. 7, an embodiment of this application provides a device. The device 110 includes a processor 112, a communications interface 113, and a memory 111. Optionally, the PE 110 may further include a bus 114. The communications interface 113, the processor 112, and the memory 111 are connected to each other by using the bus 114. The bus 114 may be a peripheral component interconnect (Peripheral Component Interconnect, PCI) bus, an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, or the like. The bus 114 may be classified as an address bus, a data bus, a control bus, or the like. For ease of representation, only one thick line is used to represent the bus 114 in FIG. 7, but this does not mean that there is only one bus or only one type of bus.

    [0042] The memory 111 is configured to store an instruction that can be executed by the processor 112, and the processor 112 is configured to invoke the instruction stored in the memory 111, to perform the steps in the foregoing fast service restoration method in the path switching process.

    [0043] All or some of the steps of the foregoing method embodiments may be implemented by a program instructing relevant hardware. The foregoing program may be stored in a readable memory. When the program is executed, the steps of the foregoing method embodiments are performed. The memory (storage medium) includes: a read-only memory (Read-only Memory, ROM), a RAM, a flash memory, a hard disk, a solid-state drive, a magnetic tape (magnetic tape), a floppy disk (floppy disk), an optical disc (optical disc), and any combination thereof.

    [0044] The foregoing descriptions are merely specific implementations of the present invention, but are not intended to limit the protection scope of the present invention. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.


    Claims

    1. A fast service restoration method in a path switching process, comprising:

    sending multicast control packets to a second device and a third device through a first interface and a second interface respectively, wherein the multicast control packet carries a transparent transmission identifier, a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, both the second device and the third device are connected to a multicast server, the multicast control packets are sent to the multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established; and

    after the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, receiving, over a first path or a second path, a multicast service packet delivered by the multicast server.


     
    2. The fast service restoration method in the path switching process according to claim 1, comprising:
    after receiving the multicast control packet, determining, by the second device or the third device, whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmitting the multicast control packet to the multicast server.
     
    3. The fast service restoration method in the path switching process according to claim 2, before the sending multicast control packets to a second device and a third device through a first interface and a second interface respectively, further comprising:

    receiving multicast packets and identifying the multicast control packet; and

    adding a user-defined penetration identifier to the multicast control packet.


     
    4. The fast service restoration method in the path switching process according to claim 3, further comprising:
    replicating the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.
     
    5. The fast service restoration method in the path switching process according to any one of claims 1 to 4, before the multicast control packets are sent to the multicast server through the ports of the second device and the third device, further comprising:

    sending, by the second device, the multicast control packet to a fourth device; and

    sending, by the third device, the multicast control packet to a fifth device; wherein

    the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server.


     
    6. A device, connected to a second device and a third device through a first interface and a second interface respectively, wherein a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, and both the second device and the third device are connected to a multicast server; and the device comprises:

    a sending unit, configured to send multicast control packets to the second device and the third device through the first interface and the second interface respectively, wherein the multicast control packet carries a transparent transmission identifier, the port of at least one of the second device and the third device is in the blocked state controlled by the ring network protocol, both the second device and the third device are connected to the multicast server, the multicast control packets are sent to the multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established; and

    a receiving unit, configured to: after the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, receive, over a first path or a second path, a multicast service packet delivered by the multicast server.


     
    7. The device according to claim 6, wherein after receiving the multicast control packet, the second device or the third device determines whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmits the multicast control packet to the multicast server.
     
    8. The device according to claim 6, further comprising a processing unit, wherein before the sending unit sends the multicast control packets to the second device and the third device through the first interface and the second interface respectively, the receiving unit further receives multicast packets and sends the multicast packets to the processing unit; and
    the processing unit identifies the multicast control packet and adds a user-defined penetration identifier to the multicast control packet.
     
    9. The device according to claim 8, wherein the processing unit is further configured to replicate the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.
     
    10. The device according to any one of claims 6 to 8, wherein before the multicast control packets are sent to the multicast server through the ports of the second device and the third device,
    the second device sends the multicast control packet to a fourth device, and the third device sends the multicast control packet to a fifth device; wherein
    the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server.
     
    11. A multicast system, comprising a first device, a second device, a third device, and a voice multicast server, wherein the first device is connected to the second device and the third device through a first interface and a second interface respectively, a port of at least one of the second device and the third device is in a blocked state controlled by a ring network protocol, and both the second device and the third device are connected to the multicast server; and
    the first device sends multicast control packets to the second device and the third device through the first interface and the second interface respectively, wherein the multicast control packet carries a transparent transmission identifier, the port of at least one of the second device and the third device is in the blocked state controlled by the ring network protocol, both the second device and the third device are connected to the multicast server, the multicast control packets are sent to the multicast server through ports of the second device and the third device, negotiation of a service protocol is established with the multicast server, and a forwarding entry is established; and after the blocked states that are of the second device and the third device that are controlled by the ring network protocol are changed, the first device receives, over a first path or a second path, a multicast service packet delivered by the multicast server.
     
    12. The multicast system according to claim 11, wherein after receiving the multicast control packet, the second device or the third device determines whether the multicast control packet carries the transparent transmission identifier, and if the multicast control packet carries the transparent transmission identifier, transparently transmits the multicast control packet to the multicast server.
     
    13. The multicast system according to claim 11, wherein before sending the multicast control packets to the second device and the third device through the first interface and the second interface respectively, the first device is further configured to: after receiving multicast packets, identify the multicast control packet and add a user-defined penetration identifier to the multicast control packet.
     
    14. The multicast system according to claim 13, wherein the first device is further configured to replicate the multicast control packet to which the user-defined penetration identifier is added, to obtain a plurality of multicast control packets.
     
    15. The multicast system according to any one of claims 11 to 14, wherein before the multicast control packets are sent to the multicast server through the ports of the second device and the third device,
    the second device sends the multicast control packet to a fourth device, and the third device sends the multicast control packet to a fifth device; wherein
    the fourth device is connected between the second device and the multicast server, and the fifth device is connected between the third device and the multicast server.
     
    16. A device, comprising a processor, a memory, a bus, and a communications interface, wherein the memory is configured to store a computer-executable instruction, the processor and the memory are connected by using the bus, and when the device runs, the processor executes the computer-executable instruction stored in the memory, to perform the method according to any one of claims 1 to 5.
     




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