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WO2010006524A1 - Procédé de multidiffusion fiable, appareil et système fournisseur de couche supérieure - Google Patents

Procédé de multidiffusion fiable, appareil et système fournisseur de couche supérieure Download PDF

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Publication number
WO2010006524A1
WO2010006524A1 PCT/CN2009/071467 CN2009071467W WO2010006524A1 WO 2010006524 A1 WO2010006524 A1 WO 2010006524A1 CN 2009071467 W CN2009071467 W CN 2009071467W WO 2010006524 A1 WO2010006524 A1 WO 2010006524A1
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Prior art keywords
carrier
multicast
edge
layer device
carrier edge
Prior art date
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Ceased
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PCT/CN2009/071467
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English (en)
Chinese (zh)
Inventor
任翔
凌义
赵凤华
吴迪
赵诤
段学罡
覃剑宏
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2010006524A1 publication Critical patent/WO2010006524A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks

Definitions

  • 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.
  • VPLS Virtual Private LAN Service
  • PEs Carrier Edge Devices
  • HVPLS Hierarchical Virtual Private LAN Service
  • FIG. 1 is a schematic structural diagram of a hierarchical virtual private network
  • PE In the basic model of HVPLS, PE can be divided into two types:
  • UPE Underlayer Provider Edge
  • CE Consumer Edge
  • UPE11 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.
  • VPLS has been used more and more widely.
  • 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.
  • IGMP Snooping Internet Group Management Protocol
  • 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.
  • 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:
  • 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;
  • the upper-layer device performs the active/standby configuration.
  • 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 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.
  • 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
  • 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.
  • 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 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.
  • 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.
  • 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.
  • FIG. 1 is a schematic structural diagram of a hierarchical virtual private network
  • FIG. 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.
  • 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:
  • 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.
  • 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.
  • 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:
  • Each SPE broadcasts a query message, and queries which UPEs connected to it can receive the multicast service.
  • 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.
  • a multicast path is established between the SPE that receives the response packet and the UPE that sends the response packet.
  • 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.
  • 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.
  • VRRP Virtual Router Redundancy Protocol
  • 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.
  • 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;
  • 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 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.
  • 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 implemented 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.
  • SPE60 SPE602 and SPE603 form a fully-connected VPLS.
  • SPE60 SPE602 and SPE603 broadcast queries.
  • the UPE 609 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.
  • the SPE 602 and the SPE 603 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.
  • 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 603 and the UPE 608 is the standby path 606.
  • 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.
  • 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.
  • UPE608 and UPE609 both have two multicast paths connected to the SPE, and SPE602 and SPE603 also implement mutual backup.
  • the SPE 601, the SPE 602, and the SPE 603 receive the multicast data sent by the multicast source 600.
  • 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.
  • 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 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.
  • 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.
  • the active/standby configuration does not take effect.
  • SPE1 is the primary SPE of UPE 1
  • SPE2 is the standby SPE of the UPE1. It is valid only for UPE1.
  • SPE2 is the primary SPE of the UPE2
  • SPE1 is the primary SPE.
  • the standby SPE of the UPE2 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.
  • 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.
  • 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 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 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.
  • 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.
  • 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.
  • 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).
  • the 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.
  • 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.
  • 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 path is the primary path 605; the multicast path between the SPE 602 and the UPE 609 is the alternate path 607.
  • this example is intended to illustrate that the active/standby configuration relationship between SPEs is only for a certain UPE.
  • 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.
  • UPE608 and UPE609 both have two multicast paths connected to the SPE, and the SPE602 and SPE603 also implement mutual backup.
  • SPE60 SPE602 receives the multicast data sent by the multicast source 600 to the CE61 0.
  • 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.
  • the SPE 603 fails.
  • the SPE 603 fails to forward the multicast data through the primary path 605 because the fault occurs.
  • 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.
  • the UPE 609 forwards the data to the CE 61 1 .
  • the method for the reliable multicast 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.
  • 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.
  • 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.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé de multidiffusion fiable, un routeur périphérique fournisseur de couche supérieure et un système. Le procédé comprend : l’établissement d’un trajet de multidiffusion indépendant entre chaque routeur périphérique fournisseur de couche supérieure (SPE) et ladite au moins un routeur périphérique fournisseur de liaison montante (UPE) selon un protocole de surveillance de trafic ; le réglage en l’état principal ou l’état auxiliaire pour tous les trajets de multidiffusion routeur SPE établis avec le même routeur UPE et la détermination du fonctionnement normal ou non du routeur SPE principal ; le transfert des données de multidiffusion vers le routeur UPE si le fonctionnement est normal ; ou le transfert des données de multidiffusion vers le routeur UPE via le trajet de multidiffusion établi entre le routeur SPE auxiliaire et le routeur UPE si le fonctionnement est anormal. Ainsi le problème de manque de protection entre le routeur SPE et le routeur UPE dans la technologie HVPLS est résolu.
PCT/CN2009/071467 2008-07-18 2009-04-24 Procédé de multidiffusion fiable, appareil et système fournisseur de couche supérieure Ceased WO2010006524A1 (fr)

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CN101321077A (zh) * 2008-07-18 2008-12-10 华为技术有限公司 可靠组播的方法、运营商边缘上层设备及系统

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