WO2011095008A1 - 提高虚拟专用局域网业务网络转发效率的方法和系统 - Google Patents

提高虚拟专用局域网业务网络转发效率的方法和系统 Download PDF

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Publication number
WO2011095008A1
WO2011095008A1 PCT/CN2010/076942 CN2010076942W WO2011095008A1 WO 2011095008 A1 WO2011095008 A1 WO 2011095008A1 CN 2010076942 W CN2010076942 W CN 2010076942W WO 2011095008 A1 WO2011095008 A1 WO 2011095008A1
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Prior art keywords
packet
point
root node
message
leaf node
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PCT/CN2010/076942
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English (en)
French (fr)
Inventor
陈然
金利忠
吴波
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/574,903 priority Critical patent/US8730979B2/en
Priority to ES10845091.7T priority patent/ES2551232T3/es
Priority to EP10845091.7A priority patent/EP2518952B1/en
Publication of WO2011095008A1 publication Critical patent/WO2011095008A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4641Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/28Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46Interconnection of networks
    • H04L12/4633Interconnection of networks using encapsulation techniques, e.g. tunneling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/68Pseudowire emulation, e.g. IETF WG PWE3
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/16Multipoint routing

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for forwarding a "text" in a virtual private local area network service network.
  • VPLS Virtual Private LAN Services
  • L2VPN technology for Internet Protocol (IP)/Multi Protocol Label Switching (MPLS) and Ethernet technology which can be used in metropolitan area networks.
  • Ethernet-like multipoint services are available on Metropolitan Area Network (MAN) and Wide Area Network (WAN).
  • Pesudo Wireless (PW) is established and maintained between the Provider Edge (PE) nodes, and the Layer 2 protocol frames are encapsulated and transmitted and exchanged through the PW to enable multiple LANs in the wide area to be in the data link.
  • Layers are integrated into a single network, providing users with virtual Ethernet services to support point-to-point, point-to-multipoint, multi-point to multi-point service types, enabling carrier-grade Ethernet services over a large network scale .
  • the VPLS network was mainly used to forward unicast packets.
  • the VPLS network not only transmits unicast packets, but also broadcasts broadcast, multicast, and/or unknown unicast packets.
  • the carrier edge device When transmitting broadcast, multicast, and/or unknown unicast packets, it is necessary to rely on the carrier edge device to copy broadcast, multicast, and/or unknown unicast packets, and then send them to each receiving user boundary through multiple pseudowires.
  • Equipment Customer Edge, CE
  • FIG. 1 if the above pseudowires transmit data through the same shared physical path, multiple copies of the same broadcast, multicast, and/or unknown unicast "When" are discarded on the shared physical path. Network bandwidth.
  • VPLS optimizes and improves multicast, and proposes VPLS multicast technology.
  • VPLS multicast technology provides multicast services through the carrier multicast tree.
  • the input source of the VPLS multicast is the IP multicast service data on the accessing circuit (AC) connected to the PE.
  • IP multicast service data is generally transmitted by using a tree. Only when the IP multicast traffic crosses the set threshold, the tree is selected through the selection tree. Line transfer.
  • the carrier multicast tree is a converged tree that aggregates multiple VPLS instances, that is, multiple services are transmitted through one carrier multicast tree. In order to differentiate the services that reach the user side, the IP group needs to be configured.
  • the broadcast data encapsulates a VPLS instance label, and then is transmitted to the leaf of the operator's P2MP multicast tree through the carrier's point-to-multipoint (P2MP) multicast tree, that is, the Label Switched Router (LSR). ).
  • P2MP point-to-multipoint
  • LSR Label Switched Router
  • the VPLS multicast optimization technology applied in the VPLS network needs to support the signaling function of VPLS multicast. Meanwhile, the VPLS multicast uses the Border Gateway Protocol (BGP) for signaling, which requires all devices in the VPLS network.
  • BGP Border Gateway Protocol
  • the BGP protocol must be supported. Due to the complexity of the BGP protocol, the requirements on the device are relatively high, and the implementation is complicated, resulting in high operating costs.
  • the present invention provides a method and system for improving the forwarding efficiency of a VPLS network, which reduces the number of redundant packets on a physical link and is simple to implement.
  • the present invention provides the following technical solutions:
  • a method for improving the forwarding efficiency of a virtual private local area network service network including:
  • the root node operator edge device (PE) in the virtual private area network service (VPLS) network transmits at least one of a broadcast message, a multicast message, and an unknown unicast message through a point-to-multipoint pseudowire (P2MP PW). Transfer to the leaf node PE in the same VPLS.
  • P2MP PW point-to-multipoint pseudowire
  • the step of the root node PE transmitting the at least one of the broadcast packet, the multicast packet, and the unknown unicast packet to the leaf node PE in the same VPLS by using the point-to-multipoint pseudowire may include: the root node PE receives the data packet Then, if the packet type of the data packet is a broadcast packet, a multicast packet, or an unknown unicast packet, the received data packet is transmitted to the leaf node through the point-to-multipoint pseudowire.
  • All or a part of the PEs in the VPLS network may transmit at least one of a broadcast packet, a multicast packet, and an unknown unicast packet by using a point-to-multipoint pseudowire.
  • the method may further include: establishing, by the root node PE in the VPLS network A point-to-multipoint pseudowire of the leaf node PE.
  • a part of the PEs in the VPLS network may transmit at least one of a broadcast packet, a multicast packet, and an unknown unicast packet by using a point-to-multipoint pseudowire.
  • the triggering conditions may include: the currently copied broadcast packet, The traffic of at least one of the multicast packet and the unknown unicast packet reaches a preset threshold.
  • the method may also have the following features: When the PE is the root node PE, the root node PE and the leaf node PE in the VPLS network establish a point-to-multipoint pseudowire.
  • the root node PE can establish a point-to-multipoint pseudowire with the leaf node PE in the VPLS network in the following manner: Configure the access group identifier (AGI) and access specific identifier (All) of the root node PE at the root node PE Configuring the access group identifier (AGI) and the source access specific identifier (SAII) configured by the root node PE at the leaf node PE; the root node PE automatically discovers through the static configuration or Border Gateway Protocol (BGP) to obtain the same VPLS The leaf node PE; the root node PE uses the label distribution protocol to establish a point-to-multipoint pseudowire.
  • AGI access group identifier
  • SAII source access specific identifier
  • the root node PE sends a label distribution protocol (LDP) mapping message to the leaf node PE in the discovered VPLS network.
  • LDP label distribution protocol
  • the leaf node PE determines whether the [AGI, SAII] in the local configuration and the [AGI, SAII] carried in the LDP mapping message match, and if it does not match, it will notify the root node that the matching fails, if at least one PE matches If the PE is successfully matched, the P2MP PW fails to be established. If no PE matches successfully, the P2MP PW fails to be established.
  • the method may further include: the leaf node PE receives the data packet transmitted by the root node PE through the point-to-multipoint pseudowire, and then forwards the data packet to the receiver, and performs media access control (MAC) address learning to source the data.
  • the MAC address is used as the index entry of the MAC forwarding table, and the outbound interface is a point-to-point pseudowire between the PE and the root PE to form a MAC forwarding table corresponding to the unicast packet.
  • the present invention also provides a virtual private local area network service network system, which includes multiple PEs, and multiple PEs include a root node PE and a leaf node PE, where
  • the root node PE is configured to deliver at least one of a broadcast packet, a multicast packet, and an unknown unicast packet to a leaf node PE in the same VPLS through a point-to-multipoint pseudowire.
  • the root node PE may include: an establishing module, which may be configured to establish a point-to-multipoint pseudowire with the leaf node PE in the VPLS network; and a determining module, which may be configured to determine the data packet after receiving the data packet
  • the message type is: a transmission module, configured to transmit the data message to the leaf node PE by using a point-to-multipoint pseudowire when determining that the data message is a broadcast message, a multicast message, or an unknown unicast message.
  • the system may also have the following features: All the PEs in the VPLS network transmit at least one of a broadcast packet, a multicast packet, and an unknown unicast packet through a point-to-multipoint pseudowire.
  • the system may also have the following features: A part of the PEs in the VPLS network transmit at least one of a broadcast packet, a multicast packet, and an unknown unicast packet through a point-to-multipoint pseudowire.
  • the root node PE may also include: A triggering module, which can be set to trigger a local PE to establish a point-to-multipoint pseudowire to the leaf node.
  • the triggering module may be further configured to: when the triggering condition is met, control the local PE to transmit at least one of a broadcast packet, a multicast packet, and an unknown unicast packet by using a point-to-multipoint pseudowire, where the triggering condition includes: the currently copied broadcast The traffic of at least one of the packet, the multicast packet, and the unknown unicast packet reaches a preset threshold.
  • the establishing module may include: a configuration unit, which may be configured to configure an access group identifier (AGI) and an access specific identifier (All) of the root node PE; and a discovery unit, which may be configured to discover leaf nodes in the same VPLS network PE; an establishment unit that can be configured to establish a point-to-multipoint pseudowire using a label distribution protocol.
  • AGI access group identifier
  • All access specific identifier
  • the leaf node PE may include: a configuration module, which may be configured to configure AGI and SAII of the root node configuration on the local PE; and a judging module, which may be configured to determine whether the locally configured [AGI, SAII] is carried in the label mapping message [ AGI, SAII] matches; a notification module, which can be set to notify the root node PE that the leaf node PE has not successfully joined the P2MP PW.
  • a configuration module which may be configured to configure AGI and SAII of the root node configuration on the local PE
  • a judging module which may be configured to determine whether the locally configured [AGI, SAII] is carried in the label mapping message [ AGI, SAII] matches
  • a notification module which can be set to notify the root node PE that the leaf node PE has not successfully joined the P2MP PW.
  • the leaf node PE may include: a receiving module, configured to receive a data message transmitted by the point-to-multipoint pseudowire; and a forwarding module, configured to forward the received data message to the user receiver;
  • the outbound interface is a point-to-point pseudowire between the PE and the root node PE, and forms a MAC forwarding table corresponding to the unicast packet.
  • the technical solution provided by the present invention performs packet transmission by using the P2MP PW between the PE and the other PEs, reduces the number of redundant packets on the physical link, and improves the forwarding efficiency of the network.
  • the P2MP PW is established by using the LDP protocol. Established, its establishment method is simple, easy to implement, and reduces the operating cost of the network.
  • FIG. 1 is a schematic diagram of a VPLS network forwarding a multicast packet, a broadcast packet, and/or an unknown unicast message in the prior art
  • FIG. 2 is a schematic diagram of forwarding a multicast packet, a broadcast packet, and/or an unknown unicast packet by using a VPLS multicast aggregation technology in a VPLS network in the prior art;
  • 3 is a schematic diagram of transmitting a multicast packet, a broadcast packet, and/or an unknown unicast packet according to the present invention
  • 4 is a flowchart of a method for transmitting a VPLS packet according to Embodiment 1 of the present invention
  • FIG. 5 is a flowchart of a method for transmitting a VPLS packet according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a root node PE according to the present invention.
  • FIG. 7 is another schematic structural diagram of a root node PE in the embodiment shown in FIG. 6;
  • FIG. 8 is a schematic structural diagram of a module 601 in the embodiment shown in FIG. 6;
  • FIG. 9 is a schematic structural diagram of a leaf node PE in the present invention.
  • FIG. 10 is another schematic structural diagram of a leaf node PE in the embodiment shown in FIG. 9.
  • the PE node in the VPLS broadcasts a message, a multicast message, and/or an unknown through a point-to-multipoint Pesudowire ( ⁇ 2 ⁇ PW) between the local and other members in the same VPLS.
  • a point-to-multipoint Pesudowire ⁇ 2 ⁇ PW
  • each PE node in the VPLS network transmits the broadcast packet, the multicast packet, and/or the unknown unicast packet through the P2MP PW.
  • PE1 is the root node
  • PE2, PE3, PE4 and PE5 are leaf nodes. The specific process is shown in Figure 4:
  • Step 401 Perform corresponding configuration on the root node PE and the leaf node PE.
  • the node PE is configured with an Attachment Group Identifiers (AGI) and an Attachment Individual Identifiers (All).
  • the leaf node PE configures an Attachment Group Identifiers (AGI) and a Source Attachment Individual Identifiers (SAII), expressed as [AGI, SAII]ong.
  • AGI is an identifier that identifies a virtual instance; ⁇ is used to identify the connection between the PE and the CE; SAII is used to identify the connection between the ingress PE and the data message sending end CE.
  • PE1 is configured with AGI1 and AII12; PE2, PE3, PE4, and PE5 are configured.
  • Step 402 The root node PE establishes a P2MP PW to the leaf node by using a label distribution protocol. Specifically, before the P2MP PW is established, the root node PE can also automatically discover other PEs in the same VPLS through static configuration. In this embodiment, all the PEs except the root node PE in the same VPLS are used as the leaf nodes PE of the root node PE.
  • the root node Before establishing a P2MP PW, the root node searches for the P2MP LSP that carries the P2MP PW from the established P2MP LSP.
  • the P2MP LSP can be established using either the RS VP-TE technology or the MLDP technology.
  • the root node PE sends a Label Distribution Protocol (LDP) mapping message to other PEs in the VPLS network, carrying [AGI, SAII]; other PEs determine that the locally configured [AGI, SAII] and LDP mapping messages are carried. Whether the [AGI, SAII] matches, if the match does not match, the root node fails to be matched. If at least one PE is successfully matched, the root node successfully establishes a P2MP PW with the matching PE as the leaf node. , the P2MP PW fails to be established.
  • LDP Label Distribution Protocol
  • Step 403 The root node PE receives the data packet.
  • CE1 sends a data packet to PE1.
  • CE1 can send any message, for example, it can be a known unicast message, an unknown unicast message, a broadcast message, and a multicast message.
  • Step 404 The root node PE determines whether the data packet is a known unicast packet.
  • PE1 determines the type of the message based on the range of the medium access control (MAC) address. If it is a broadcast message and a multicast message, step 407 410 is performed. If the unicast packet is a unicast packet, the MAC address forwarding table is further searched. If the unicast packet is determined to be a unicast packet, the process proceeds to step 405 406. If the unicast packet is not found, the unicast packet is determined to be If the unicast packet is unknown, go to steps 407-410.
  • MAC medium access control
  • Step 405 The root node PE transmits the known unicast packet through the P2P PW.
  • the PE1 forwards the known unicast packet to the receiver PE according to the MAC forwarding table.
  • Step 406 The PE that receives the known unicast packet forwards the packet to the receiver CE according to the MAC forwarding table, and completes the transmission of the known unicast>3 ⁇ 4 text.
  • Step 407 The root node PE searches for the P2MP PW according to the VPLS instance.
  • the VPLS instance is determined according to the ingress port of the data packet, and then the P2MP PW corresponding to the VPLS instance is searched.
  • a VPLS instance is a one-to-many relationship with a P2MP PW because each PE can be either a root node or a leaf node.
  • Step 408 The root node PE transmits the received unknown unicast packet, multicast packet, and broadcast packet by using the obtained P2MP PW.
  • PE1 is forwarded to PE2, PE3, PE4, and PE5 through P2MP PW1.
  • Step 409 The leaf node PE learns the source MAC address, and forms a corresponding MAC forwarding table.
  • PE2, PE3, PE4, and PE5 after receiving the unknown unicast packet, the multicast packet, and/or the broadcast packet, PE2, PE3, PE4, and PE5 perform MAC address learning to form a MAC forwarding table corresponding to the unicast packet:
  • the PE selects the source MAC address of the unknown unicast packet, the multicast packet, and/or the broadcast packet as the index entry of the MAC forwarding table, and the outbound interface between the PE (PE2, PE3, PE4, and PE5) and PE1.
  • P2P PW The leaf node PE learns the source MAC address, and forms a corresponding MAC forwarding table.
  • Step 410 The leaf node PE forwards the data packet to the receiver CE.
  • the leaf node PE forwards the unknown unicast packet, multicast packet, and/or broadcast packet to all receiver CEs connected to the leaf node PE.
  • the leaf node supports the IGMP function, the IGMP leaf forwarding table can be accurately forwarded to the receiver CE that needs this traffic.
  • PE2, PE3, PE4, PE5, and PE6 need to be configured the same as PE1 and support the same functions. For example, you need to establish a P2MP PW with PE2 as the root node and PE1, PE3, PE4, and PE5 as leaf nodes.
  • the PE node of the VPLS network transmits the broadcast packet, the multicast packet, and/or the unknown unicast packet through the P2MP PW when the configuration policy is met.
  • the policy of whether the PE2 uses the P2MP PW to transmit the broadcast packet, the multicast packet, and/or the unknown unicast packet may be a threshold trigger, that is, when the traffic copied by a PE node exceeds a certain threshold,
  • the PE is the root node, and the other PEs in the same VPLS instance establish a P2MP PW for the leaf node.
  • the specific process is shown in Figure 5:
  • Step 501 The PE node collects multicast traffic that passes every second.
  • the traffic of the multicast message per second is calculated by using PE1 as an example.
  • Step 502 The PE node determines whether the traffic of the multicast packet exceeds the threshold value per second. If the traffic of the multicast packet passed by the PE1 does not exceed the maximum value set by the PE1, the PE node uses the existing mode. A multicast packet, a broadcast packet, and/or an unknown unicast packet are transmitted, so that all member PEs in the same VPLS instance can receive the packet. If the traffic of the multicast packet exceeds the maximum value set by PE1, the subsequent steps 504 to 513 are performed, and the processes of steps 504 to 513 are the same as steps 401 to 410. , will not repeat them here.
  • the P2MP PW is established when the traffic reaches a threshold, and the data packet is forwarded after the establishment, and the P2MP PW may be established in advance. After the traffic reaches a threshold, the pre-established The P2MP PW forwards data packets.
  • the present invention also provides a virtual private local area network service network system, which includes the root node PE and the leaf node PE, and the root node PE broadcasts the broadcast message and the multicast message through the point-to-multipoint pseudowire. At least one of the unknown unicast packets is delivered to the leaf node PE in the same VPLS.
  • the root node PE includes:
  • a determining module 602 configured to determine a packet type of the data packet after receiving the data packet;
  • a transmission module 603 configured to: when the data packet is a broadcast packet, a multicast packet, or an unknown unicast packet, transmit the data packet to the leaf by using the point-to-multipoint pseudowire Node PE.
  • all PEs in the VPLS network transmit at least one of a broadcast message, a multicast message, and an unknown unicast message through a point-to-multipoint pseudowire.
  • a part of the PEs in the VPLS network transmits at least one of a broadcast message, a multicast message, and an unknown unicast message through a point-to-multipoint pseudowire.
  • the root node PE further includes:
  • the triggering module 701 is configured to trigger the local PE to establish a point-to-multipoint pseudowire to the leaf node. Further, the triggering module 701 is further configured to: when the trigger condition is met, control the local PE to transmit at least one of a broadcast, a multicast message, and an unknown unicast message by using a point-to-multipoint pseudowire.
  • the triggering condition includes: the traffic of at least one of the currently copied broadcast packet, the multicast packet, and the unknown unicast packet reaches a preset threshold.
  • the establishing module 601 specifically includes:
  • a configuration unit 801 configured to configure an access group identifier (AGI) and an access specific identifier (All) of the root node;
  • Discovery unit 802 which is configured to discover other PEs in the same VPLS network
  • a unit 802 is set up to establish a point-to-multipoint pseudowire using the label distribution protocol.
  • the leaf node PE includes:
  • a configuration module 901 configured to configure AGI and SAII configured by the root node
  • the determining module 902 is configured to determine whether the locally configured [AGI, SAII] matches the [AGI, SAII] carried in the label mapping message;
  • the notification module 903 is configured to notify the root node that the leaf node does not successfully join the P2MP PW.
  • the leaf node PE further includes:
  • the receiving module 1001 is configured to receive the data message transmitted by the point-to-multipoint pseudowire; the forwarding module 1002 is configured to forward the received data message to the user receiver; the forwarding table management module 1003
  • the source MAC address of the data packet is used as an index entry of the MAC forwarding table, and the outbound interface is a point-to-point pseudowire between the PE and the root node PE to form a MAC forwarding table corresponding to the unicast packet.
  • each functional unit in each embodiment of the present invention may be implemented in the form of hardware, or may be implemented in the form of a software functional module.
  • the integrated module can also be stored in a computer readable form if it is implemented in the form of a software functional module and sold or used as a standalone product. Take the storage medium.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the present invention performs packet transmission through the P2MP PW between the PE and other PEs, reduces the number of redundant packets on the physical link, and improves the forwarding efficiency of the network.
  • the P2MP PW is established.
  • the establishment of the LDP protocol is simple and easy to implement, and reduces the operating cost of the network.

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Abstract

本发明提供一种提高虚拟专用局域网业务网络转发效率的方法和系统,该方法包括:虚拟专用局域网业务VPLS网络中的根节点运营商边缘设备PE通过点到多点伪线P2MPPW将广播报文、组播报文和未知单播报文中的至少一种传输到同一VPLS内的叶子节点PE。本发明通过PE与其他PE之间的P2MPPW进行报文传输,减少物理链路上冗余报文的数量,提高了网络的转发效率,降低了网络的运营成本。

Description

提高虚拟专用局域网业务网络转发效率的方法和系统
技术领域
本发明涉及通信领域, 尤其涉及一种虚拟专用局域网业务网络转发 "^文 的方法和系统。
背景技术
VPLS ( Virtual Private LAN Services, 虚拟专用局域网业务网络) ^^于 互联网协议 ( Internet Protocol, IP ) /多协议标签交换(Multi Protocol Label Switching, MPLS )和以太网技术的 L2VPN技术,能够在城域网( Metropolitan Area Network, MAN )及广域网 ( Wide Area Network, WAN)上提供类似以 太网的多点服务。 在运营商边缘设备 ( Provider Edge , PE )节点间建立及维 护伪线(Pesudo Wireless, PW ) , 将二层协议帧封装后通过 PW传输和交换, 使广域范围内多个局域网在数据链路层被整合为一张网络, 向用户提供虚拟 的以太网服务, 从而支持点到点、 点到多点、 多点到多点的业务类型, 能够 在较大网络规模下支持电信级以太网服务。
过去 VPLS 网络主要用于单播报文的转发, 目前随着组播技术的发展、 VPLS网络不但要传输单播报文, 还要传输广播、 组播、 和 /或未知单播报文。 在传输广播、组播、和 /或未知单播报文时, 需要依靠运营商边缘设备对广播、 组播、 和 /或未知单播报文进行复制, 再通过多条伪线发送至各个接收用户边 界设备(Custom Edge, CE )。 如图 1所示, 如果上述伪线是通过同一共享物 理路径传输数据的, 则在该共享物理路径上会出现多份相同的广播、 组播、 和 /或未知单播 "^文, 浪费了网络带宽。
进而 VPLS针对组播进行了优化改进, 提出 VPLS组播技术。 VPLS组播 技术是通过运营商组播树提供组播业务。 在 VPLS组播中有包含树 ( Inclusive Tree )和选择树 ( selective Tree ) , VPLS组播的输入来源是与 PE相连的接入 链路(Attachment Circuit, AC )上的 IP组播业务数据。 IP组播业务数据一般 釆用包含树传送, 只有在 IP组播流量越过设定的阔值时, 才通过选择树来进 行传送。 如图 2所示, 如果运营商组播树是汇聚多个 VPLS实例的包含树, 即多个业务通过一个运营商组播树来传递, 为了对到达用户侧的业务进行区 分, 需要将 IP组播数据封装一个 VPLS 实例标签, 再通过运营商点到多点 ( Point-to-Multipoint, P2MP )组播树传递到运营商 P2MP组播树上的叶子, 即标签交换路由器(Label Switched Router, LSR ) 。
在 VPLS网络中应用上述 VPLS组播的优化技术, 需要支持 VPLS组播 的信令功能; 同时, VPLS组播中釆用边界网关协议(BGP )作信令, 这就要 求 VPLS网络中的所有设备必须支持 BGP协议, 由于 BGP协议的本身复杂 性使得其对设备要求比较高, 实现比较复杂, 造成运营成本较高。
发明内容
本发明提供一种提高 VPLS 网络转发效率的方法和系统, 减少物理链路 上冗余报文的数量且实现方法简单。
为达到上述发明目的, 本发明提供了如下技术方案:
一种提高虚拟专用局域网业务网络转发效率的方法, 包括:
所述虚拟专用局域网业务( VPLS )网络中的根节点运营商边缘设备 ( PE ) 通过点到多点伪线( P2MP PW )将广播报文、 组播报文和未知单播报文中的 至少一种传输到同一 VPLS内的叶子节点 PE。
根节点 PE通过点到多点伪线将广播报文、组播报文和未知单播报文中的 至少一种传输到同一 VPLS内的叶子节点 PE的步骤可包括: 根节点 PE收到 数据报文后, 若判断数据报文的报文类型为广播报文、 组播报文或未知单播 报文时, 通过点到多点伪线将收到数据报文传输到叶子节点。
VPLS网络中的全部或部分 PE可通过点到多点伪线传输广播报文、 组播 报文和未知单播报文中的至少一种; 该方法还可包括: VPLS网络中的根节点 PE建立到叶子节点 PE的点到多点伪线。 VPLS网络中部分 PE可以在满足触 发条件时, 通过点到多点伪线传输广播报文、 组播报文和未知单播报文中的 至少一种, 触发条件可包括: 当前复制的广播报文、 组播报文和未知单播报 文中至少一个的流量达到预先设置的阔值。 该方法还可具有如下特点: 当 PE为根节点 PE时, 该根节点 PE与 VPLS 网络中的叶子节点 PE均建立点到多点的伪线。 根节点 PE可通过以下方式与 VPLS网络中的叶子节点 PE均建立点到多点伪线: 在根节点 PE配置根节点 PE的接入组识别符 (AGI)和接入特定识别符 (All);在叶子节点 PE配置根节点 PE所配置的接入组识别符 (AGI)和源接入特定识别符 (SAII); 根节点 PE通过 静态配置或边界网关协议(BGP ) 自动发现, 获取同一 VPLS 内的叶子节点 PE; 根节点 PE釆用标签分发协议建立点到多点伪线, 在该过程中, 根节点 PE向发现的 VPLS网络中的叶子节点 PE发送标签分发协议(LDP ) 映射消 息, 携带 [AGI,SAII]; 叶子节点 PE判断本地配置的 [AGI, SAII]和 LDP映射 消息中携带的 [AGI,SAII]是否匹配,若不匹配会通知根节点匹配失败,如果至 少有一个 PE匹配成功, 则根节点 PE成功建立以匹配成功的 PE为叶子节点 的 P2MP PW, 如果没有 PE匹配成功 , 则 P2MP PW建立失败。
该方法还可包括: 叶子节点 PE收到根节点 PE通过点到多点伪线传送的 数据报文后转发给接收方, 并进行介质访问控制 (MAC )地址学习, 将数据 才艮文的源 MAC地址作为 MAC转发表的索引项, 以及出接口为本 PE和根节 点 PE之间的点到点伪线, 形成单播报文对应的 MAC转发表。
本发明还提供一种虚拟专用局域网业务网络系统, 包括多个 PE, 多个 PE中包括根节点 PE和叶子节点 PE, 其中,
根节点 PE设置成通过点到多点伪线将广播报文、组播报文和未知单播报 文中的至少一种传递到同一 VPLS内的叶子节点 PE。
根节点 PE可包括: 建立模块, 其可设置成与 VPLS 网络中的叶子节点 PE均建立点到多点的伪线; 判断模块, 其可设置成在收到数据报文后, 判断 数据报文的报文类型; 传输模块, 其可设置成在判断数据报文为广播报文、 组播报文或未知单播报文时, 通过点到多点伪线将数据报文传送到叶子节点 PE。
该系统还可具有如下特点: VPLS网络中的全部 PE通过点到多点伪线传 输广播报文、 组播报文和未知单播报文中的至少一种。
该系统还可具有如下特点: VPLS网络中的部分 PE通过点到多点伪线传 输广播报文、 组播报文和未知单播报文中的至少一种。 根节点 PE还可包括: 触发模块,其可设置成触发本地 PE建立到叶子节点的点到多点的伪线。触发 模块还可设置成: 在满足触发条件时,控制本地 PE通过点到多点伪线传输广 播报文、 组播报文和未知单播报文中的至少一种, 触发条件包括: 当前复制 的广播报文、 组播报文和未知单播报文中至少一个的流量达到预先设置的阔 值。
建立模块可包括: 配置单元,其可设置成配置根节点 PE的接入组识别符 (AGI)和接入特定识别符 (All); 发现单元, 其可设置成发现同一 VPLS网络中 的叶子节点 PE;建立单元,其可设置成釆用标签分发协议建立点到多点伪线。 叶子节点 PE可包括: 配置模块, 其可设置成在本地 PE 配置根节点配置的 AGI和 SAII; 判断模块, 其可设置成判断本地配置的 [AGI,SAII]是否与标签 映射消息中携带的 [AGI,SAII]相匹配; 通知模块, 其可设置成通知根节点 PE 叶子节点 PE没有成功加入 P2MP PW。
叶子节点 PE可包括:接收模块,其可设置成接收通过点到多点伪线传送 的数据报文; 转发模块, 其可设置成将接收到的数据报文转发给用户接收方; 索引项, 以及出接口为本 PE和根节点 PE之间的点到点伪线, 形成单播报文 对应的 MAC转发表。
本发明提供的技术方案, 通过 PE与其他 PE之间的 P2MP PW进行报文 传输, 减少物理链路上冗余报文的数量,提高了网络的转发效率, 由于 P2MP PW的建立是使用 LDP协议建立的, 其建立方法简单, 容易实现, 降低了网 络的运营成本。
附图概述
图 1为现有技术中 VPLS网络转发组播报文、 广播报文、 和 /或未知单播 文的示意图;
图 2为现有技术中 VPLS网络釆用 VPLS组播聚合技术转发组播报文、 广播报文、 和 /或未知单播报文的示意图;
图 3为本发明中传输组播报文、广播报文、和 /或未知单播报文的示意图; 图 4为本发明实施例 1中传输 VPLS报文的方法流程图;
图 5为本发明实施例 2中传输 VPLS报文的方法流程图;
图 6为本发明中根节点 PE的结构示意图;
图 7为图 6所示实施例中根节点 PE的另一结构示意图;
图 8为图 6所示实施例中建立模块 601的结构示意图;
图 9为本发明中叶子节点 PE的结构示意图;
图 10为图 9所示实施例中叶子节点 PE的另一结构示意图。
本发明的较佳实施方式
在本发明中, VPLS内 PE节点通过本地与同一 VPLS内其他成员之间的 点到多点伪线( Point-to-Multipoint Pesudowire , Ρ2ΜΡ PW )进行广播报文、 组播 文、 和 /或未知单播 文的传输。
下面结合附图对本发明提供的技术方案作进一步介绍。
实施例一
在本实施例中 , VPLS网络中每个 PE节点都通过 P2MP PW进行广播报 文、 组播报文、 和 /或未知单播报文的传输, 本实例中以 PE1为根节点, PE2、 PE3、 PE4、 和 PE5为叶子节点, 具体过程如图 4所示:
步骤 401、 在根节点 PE与叶子节点 PE做相应的配置
这里,才艮节点 PE,配置接入组识别符 ( Attachment Group Identifiers, AGI ) 和接入特定识别符(Attachment Individual Identifiers, All ) 。 叶子节点 PE配 置接入组识别符 (Attachment Group Identifiers, AGI )和源接入特定识别符 ( Source Attachment Individual Identifiers, SAII ) , 表示为 [AGI, SAII]„ AGI 是识别一个虚拟实例的标识符; ΑΠ用于识别 PE与 CE之间的连接; SAII用 于识别入口 PE与数据报文发送端 CE之间的连接。
在本实施例中 PE1 配置 AGI1,AII12 ; PE2、 PE3、 PE4、 PE5 均配置
[AGI1,SAII12]。
步骤 402、 根节点 PE釆用标签分发协议建立到叶子节点的 P2MP PW。 具体的, 在建立 P2MP PW之前, 所述根节点 PE通过静态配置也可以通 过 BGP 自动发现, 获取同一 VPLS 内的其它 PE。 本实施例是将同一 VPLS 中除根节点 PE外的其它 PE均作为相对该根节点 PE的叶子节点 PE。
在建立 P2MP PW之前, 根节点从已经建立的 P2MP LSP 中寻找承载 P2MP PW的下层隧道 P2MP LSP , P2MP LSP的建立既可以使用 RS VP-TE技 术也可以使用 MLDP技术。
所述根节点 PE 向 VPLS 网络中的其他 PE发送标签分发协议(Label Distribution Protocol , LDP )映射消息, 携带 [AGI,SAII]; 其他 PE判断本地配 置的 [AGI, SAII]和 LDP映射消息中携带的 [AGI,SAII]是否匹配, 若不匹配会 通知根节点匹配失败,如果至少有一个 PE匹配成功,则根节点成功建立了以 匹配成功的 PE为叶子节点的 P2MP PW,如果没有 PE匹配成功 ,则 P2MP PW 建立失败。
步骤 403、 根节点 PE接收数据报文。
例如, 对于图 3所示的转发组播>¾文、 广播 文、 和 /或未知单播 文的 示意图, CE1发送数据报文给 PE1。 这里, CE1可以发送任何报文, 例如, 可以是已知单播报文、 未知单播报文、 广播报文以及组播报文。
步骤 404、 根节点 PE判断数据报文是否为已知单播报文。
在本实施例中, PE1根据介质访问控制 (MAC )地址的范围来确定报文 的类型。 如果是广播报文以及组播报文, 则执行步骤 407 410。 如果是单播 报文, 进一步查找 MAC转发表, 如果能够查找到, 则确定该单播报文为已 知单播 ^艮文, 则转到步骤 405 406; 查找不到, 则确定该单播 文为未知单 播报文, 则执行步骤 407~410。
步骤 405、 根节点 PE通过 P2P PW传输已知单播报文。
在本实施例中, PE1根据 MAC转发表转发所述已知单播报文给接收方 PE。
步骤 406、 接收到已知单播报文的 PE根据 MAC转发表转发报文给接收 方 CE, 完成对已知单播>¾文的传输。
步骤 407、 根节点 PE根据 VPLS实例查找 P2MP PW。 在本实施例中, 根据数据报文的入端口来判断所属的 VPLS实例, 然后 查找这个 VPLS实例所对应的 P2MP PW。 VPLS实例与 P2MP PW是一对多 的关系, 因为每个 PE既可以是根节点又可以是叶子节点。
步骤 408、 根节点 PE通过查找得到的 P2MP PW传输收到的未知单播报 文、 组播报文和广播报文。
在本实施例中, PE1通过 P2MP PW1转发给 PE2、 PE3、 PE4和 PE5。 步骤 409、 叶子节点 PE学习源 MAC地址, 形成相应的 MAC转发表。 本实施例中, PE2、 PE3、 PE4及 PE5收到未知单播报文、 组播报文、 和 /或广播报文后, 进行 MAC地址学习, 从而形成单播报文对应的 MAC转发 表: 叶子节点 PE选取未知单播报文、 组播报文、 和 /或广播报文的源 MAC 地址作为 MAC转发表的索引项,以及出接口为本 PE( PE2、 PE3、 PE4及 PE5 ) 和 PE1之间的 P2P PW。
步骤 410、 叶子节点 PE转发数据报文给接收方 CE。
叶子节点 PE将未知单播报文、 组播报文、 和 /或广播报文转发给所有与 叶子节点 PE相连的接收方 CE。当然对于组播报文,如果叶子节点支持 IGMP 功能, 可以通过 IGMP叶子转发表来精确转发给需要此流量的接收方 CE。
需要说明的是, 在实际应用中, PE2、 PE3、 PE4、 PE5、 PE6需要和 PE1 做同样的配置和支持同样的功能。例如需要建立以 PE2为根节点, PE1、 PE3、 PE4及 PE5为叶子节点的 P2MP PW。
实施例二
在本实施例中, VPLS网络的 PE节点在满足设定策略时,通过 P2MP PW 进行广播报文、 组播报文、 和 /或未知单播报文的传输。 每个 PE节点是否使 用 P2MP PW进行广播报文、 组播报文、 和 /或未知单播报文的传输的策略可 以是阔值触发、 即当某个 PE节点复制的流量超过一定阔值时, 就以这个 PE 为根节点, 同一 VPLS实例中的其它 PE为叶子节点建立 P2MP PW, 具体过 程如图 5所示:
步骤 501、 PE节点统计每秒钟通过的组播流量。
本实施例中, 以 PE1统计每秒钟组播 ^艮文的流量为例进行说明。 步骤 502、 PE节点判断每秒钟通过组播报文的流量是否超过阔值: 如果 PE1 统计的每秒钟通过组播报文的流量没有超过 PE1 设置的最大 值, 则 PE节点使用现有方式传输组播报文、 广播报文、 和 /或未知单播报文, 使得同一 VPLS实例中的所有成员 PE都能收到报文。 转发报文 (步骤 503); 如果 PE1统计的每秒钟通过组播报文的流量超过 PE1设置的最大值, 则 执行后续的步骤 504~513 , 步骤 504~513的过程同步骤 401 ~410相同, 此处 不再赘述。
需要说明的是, 本实施例以在流量达到阔值时进行 P2MP PW的建立, 并在建立后进行数据报文的转发, 还可以预先建立 P2MP PW, 在流量达到阔 值后, 通过预先建立的 P2MP PW进行数据报文的转发。
对应的, 本发明还提供一种釆用上述方法的虚拟专用局域网业务网络系 统,包括根节点 PE和叶子节点 PE,根节点 PE通过点到多点伪线将广播报文、 组播报文和未知单播报文中的至少一种传递到同一 VPLS内的叶子节点 PE。
如图 6所示, 所述根节点 PE包括:
建立模块 601 , 其设置成与所述 VPLS网络中的其他 PE均建立点到多点 的伪线;
判断模块 602, 其设置成在收到数据报文后, 判断所述数据报文的报文 类型;
传输模块 603 , 其设置成在判断所述数据报文为广播报文、 组播报文或 未知单播报文时, 通过所述点到多点伪线将所述数据报文传送到所述叶子节 点 PE。
进一步地,所述 VPLS网络中的全部 PE通过点到多点伪线传输广播报文、 组播 4艮文和未知单播 4艮文中的至少一种。
进一步地,所述 VPLS网络中的部分 PE通过点到多点伪线传输广播报文、 组播 ^艮文和未知单播 ^艮文中的至少一种。
进一步地, 如图 7所示, 所述根节点 PE还包括:
触发模块 701 , 其设置成触发本地 PE建立到叶子节点的点到多点伪线。 进一步地, 所述触发模块 701还设置成: 在满足触发条件时, 控制本地 PE通过点到多点伪线传输广播 4艮文、 组播 4艮文和未知单播^艮文中的至少一 种, 所述触发条件包括: 当前复制的广播报文、 组播报文和未知单播报文中 至少一个的流量达到预先设置的阔值。
进一步地, 如图 8所示, 所述建立模块 601具体包括:
配置单元 801 , 其设置成配置所述根节点的接入组识别符 (AGI)和接入特 定识别符 (All);
发现单元 802, 其设置成发现同一 VPLS网络中的其它 PE;
建立单元 802, 其设置成釆用标签分发协议建立点到多点伪线。
进一步, 如图 9所示, 所述叶子节点 PE包括:
配置模块 901 , 其设置成配置所述根节点配置的 AGI和 SAII;
判断模块 902, 其设置成判断本地配置的 [AGI,SAII]是否与标签映射消息 中携带的 [AGI,SAII]相匹配;
通知模块 903 ,其设置成通知根节点 PE所述叶子节点没有成功加入 P2MP PW„
可选地, 如图 10所示, 所述叶子节点 PE还包括:
接收模块 1001 , 其设置成接收通过所述点到多点伪线传送的数据报文; 转发模块 1002, 其设置成将接收到的数据报文转发给用户接收方; 转发表管理模块 1003 , 其设置成将所述数据报文的源 MAC地址作为 MAC转发表的索引项, 以及出接口为本 PE和根节点 PE之间的点到点伪线, 形成单播报文对应的 MAC转发表。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤是可以 通过程序来指令相关的硬件完成, 所述的程序可以存储于一种计算机可读存 储介质中, 该程序在执行时, 包括方法实施例的步骤之一或其组合。
另外, 在本发明各个实施例中的各功能单元可以釆用硬件的形式实现, 也可以釆用软件功能模块的形式实现。 所述集成的模块如果以软件功能模块 的形式实现并作为独立的产品销售或使用时, 也可以存储在一个计算机可读 取存储介质中。
上述提到的存储介质可以是只读存储器, 磁盘或光盘等。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限 于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易 想到变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应以权利要求所述的保护范围为准。
工业实用性
与现有技术相比 , 本发明通过 PE与其他 PE之间的 P2MP PW进行报文 传输, 减少物理链路上冗余报文的数量,提高了网络的转发效率, 由于 P2MP PW的建立是使用 LDP协议建立的, 其建立方法简单, 容易实现, 降低了网 络的运营成本。

Claims

权 利 要 求 书
1、 一种提高虚拟专用局域网业务网络转发效率的方法, 包括: 所述虚拟专用局域网业务 VPLS网络中的根节点运营商边缘设备 PE通 过点到多点伪线 P2MP PW将广播报文、 组播报文和未知单播报文中的至少 一种传输到同一 VPLS内的叶子节点 PE。
2、 根据权利要求 1所述的方法, 其中, 根节点 PE通过点到多点伪线将 广播报文、 组播报文和未知单播报文中的至少一种传输到同一 VPLS内的叶 子节点 PE的步骤包括:
所述根节点 PE收到数据报文后,判断所收到的数据报文的报文类型为广 播报文、 组播报文或未知单播报文时, 通过所述点到多点伪线将所述数据报 文传输到所述叶子节点 PE。
3、 根据权利要求 1或 2所述的方法, 其中, 所述 VPLS网络中的全部 或部分 PE通过点到多点伪线传输广播>¾文、 组播 文和未知单播 文中的 至少一种;
所述方法还包括:所述 VPLS网络中的根节点 PE建立到叶子节点 PE的 点到多点伪线。
4、 根据权利要求 3所述的方法, 其中, 所述 VPLS网络中的部分 PE通 过点到多点伪线传输广播报文、组播报文和未知单播报文中的至少一种是指: 所述 VPLS网络中部分 PE在满足触发条件时,通过点到多点伪线传输广 播 4艮文、 组播 4艮文和未知单播"¾文中的至少一种, 所述触发条件包括: 当前 复制的广播报文、 组播报文和未知单播报文中至少一个的流量达到预先设置 的阔值。
5、 根据权利要求 3所述的方法, 其中, 当 PE为根节点 PE时, 所述根 节点 PE与所述 VPLS网络中的叶子节点 PE均建立点到多点伪线。
6、 根据权利要求 5所述的方法, 其中, 所述根节点 PE通过如下方式与 所述 VPLS网络中的叶子节点 PE均建立点到多点伪线:
在根节点 PE配置所述根节点 PE的接入组识别符 AGI和接入特定识别 符 ΑΠ; 在叶子节点 PE配置所述根节点 PE所配置的接入组识别符 AGI和源接 入特定识别符 SAII;
所述根节点 PE通过静态配置或边界网关协议 BGP自动发现、获取同一 VPLS内的叶子节点 PE;
所述根节点 PE釆用标签分发协议建立点到多点伪线, 在该过程中, 所 述根节点 PE向发现的 VPLS网络中的叶子节点 PE发送标签分发协议 LDP 映射消息,携带 [AGI,SAII];叶子节点 PE判断本地配置的 [AGI, SAII]和 LDP 映射消息中携带的 [AGI,SAII]是否匹配, 若不匹配会通知根节点匹配失败, 如果至少有一个 PE匹配成功, 则根节点 PE成功建立以匹配成功的 PE为叶 子节点的 P2MP PW, 如果没有 PE匹配成功, 则点到多点伪线建立失败。
7、 根据权利要求 3所述的方法, 所述方法还包括:
所述叶子节点 PE收到根节点 PE通过所述点到多点伪线传送的数据报文 后转发给接收方, 并进行介质访问控制 MAC地址学习, 将所述数据报文的 源 MAC地址作为 MAC转发表的索引项, 以及出接口为本叶子节点 PE和根 节点 PE之间的点到点伪线, 形成单播报文对应的 MAC转发表。
8、 一种虚拟专用局域网业务 VPLS网络系统, 包括多个 PE, 所述多个 PE中包括根节点 PE和叶子节点 PE, 其中,
所述根节点 PE设置成通过点到多点伪线将广播报文、 组播报文和未知 单播 文中的至少一种传递到同一 VPLS内的叶子节点 PE。
9、 根据权利要求 8所述的系统, 其中, 所述根节点 PE包括:
建立模块, 其设置成与所述 VPLS网络中的叶子节点 PE均建立点到多 点的伪线;
判断模块,其设置成在收到数据报文后,判断所述数据报文的报文类型; 传输模块, 其设置成在判断所述数据报文为广播报文、 组播报文或未知 单播报文时, 通过所述点到多点伪线将所述数据报文传送到叶子节点 PE。
10、 根据权利要求 8或 9所述的系统, 其中, 所述 VPLS网络中的全部 PE通过点到多点伪线传输广播 文、 组播 文和未知单播 文中的至少一 种。
11、 根据权利要求 8或 9所述的系统, 其中, 所述 VPLS网络中的部分 PE通过点到多点伪线传输广播 文、 组播 文和未知单播 文中的至少一 种。
12、 根据权利要求 11所述的系统, 其中, 所述根节点 PE还包括: 触发模块, 其设置成触发本地 PE建立到叶子节点 PE的点到多点的伪 线。
13、 根据权利要求 12所述的系统, 其中,
所述触发模块还设置成:在满足触发条件时,控制本地 PE通过点到多点 伪线传输广播报文、 组播报文和未知单播报文中的至少一种, 所述触发条件 包括: 当前复制的广播报文、 组播报文和未知单播报文中至少一个的流量达 到预先设置的阔值。
14、 根据权利要求 9所述的系统, 所述建立模块包括:
配置单元: 其设置成配置所述根节点 PE的接入组识别符 AGI和接入特 定识别符 ΑΠ;
发现单元, 其设置成发现同一 VPLS网络中的叶子节点 PE;
建立单元, 其设置成釆用标签分发协议建立点到多点伪线。
15、 根据权利要求 8或 9所述的系统, 其中, 所述叶子节点 PE包括: 配置模块,其设置成在本地 PE配置所述根节点 PE配置的 AGI和 SAII; 判断模块, 其设置成判断本地配置的 [AGI,SAII]是否与标签映射消息中 携带的 [AGI,SAII]相匹配;
通知模块, 其设置成通知根节点 PE所述叶子节点 PE没有成功加入点 到多点伪线。
16、 根据权利要求 8或 9所述的系统, 其中, 所述叶子节点 PE包括: 接收模块, 其设置成接收通过所述点到多点伪线传送的数据报文; 转发模块, 其设置成将接收到的数据报文转发给用户接收方;
转发表管理模块,其设置成:将所述数据报文的源 MAC地址作为 MAC 转发表的索引项, 以及出接口为本 PE和根节点 PE之间的点到点伪线,形成 单播报文对应的 MAC转发表。
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