WO2011140921A1 - 虚拟专用局域网业务vpls的数据帧的转发方法、设备和系统 - Google Patents

虚拟专用局域网业务vpls的数据帧的转发方法、设备和系统 Download PDF

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Publication number
WO2011140921A1
WO2011140921A1 PCT/CN2011/073414 CN2011073414W WO2011140921A1 WO 2011140921 A1 WO2011140921 A1 WO 2011140921A1 CN 2011073414 W CN2011073414 W CN 2011073414W WO 2011140921 A1 WO2011140921 A1 WO 2011140921A1
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Prior art keywords
mac address
static
leaf
forwarding
frame
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PCT/CN2011/073414
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English (en)
French (fr)
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江元龙
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华为技术有限公司
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Publication of WO2011140921A1 publication Critical patent/WO2011140921A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1886—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with traffic restrictions for efficiency improvement, e.g. involving subnets or subdomains
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for forwarding a data frame of a virtual private local area network service VP LS.
  • VPLS Virtual Private Local Area Network Service
  • WAN Wide Area Network
  • MPLS Multi-Protocol Label Switching
  • the traditional VPLS usually uses the method of copy and forward. That is, the Root PE (Provider Edge) copies multiple copies of the Ethernet frame and passes the peer-to-peer PW. (Pseudo Wire, Pseudo Wire) sends a copy to each peer PE.
  • the bandwidth consumption of the VPLS network is proportional to the number of leaf PEs. Therefore, the network scalability is greatly limited, and the network operation cost is high.
  • the VSI (Virtual Switch Instance) forwarder of the VPLS usually adopts a self-learning mechanism similar to the traditional Ethernet.
  • the process is that when an Ethernet frame passes through a PW to the VSI transponder, and the frame is If the source MAC address is unknown, the address is associated with the PW.
  • the forwarding entry is stored in the MAC forwarding table of the VSI forwarder.
  • the VSI forwarder sends the address.
  • the frame to the address is transmitted through the PW.
  • the forward direction that is, the direction transmitted by the Root PE to the leaf PE, the flooding of the Ethernet frame of the multicast and the unknown unicast address is through a specially constructed multicast tree (usually a point-to-multipoint P2MP PW). It is transmitted to all the leaves, and the Ethernet frame with the known unicast address is still transmitted through the peer-to-peer P2P PW.
  • the reverse direction that is, the direction in which the leaf is transmitted to the Root PE, is also transmitted through the P2P PW.
  • the inventors have found that the prior art has the following drawbacks: Due to the asymmetry of forward multicast and reverse unicast, the leaf PE cannot normally construct its layer 2 forwarding table through MAC address self-learning.
  • Embodiments of the present invention provide a method, a device, and a system for forwarding a data frame of a virtual private local area network service VPLS, so that each leaf PE can support VPLS multicast service without reducing its forwarding plane, thereby reducing equipment cost. .
  • the embodiment of the present invention provides a method for forwarding a data frame of a virtual private local area network service VP LS, including: receiving a static MAC address installation message, where the static MAC address installation message includes media access corresponding to the multicast source port of the VPLS Controlling the MAC address; parsing the static MAC address installation message to obtain the MAC address; installing the MAC address to the static forwarding table; and when receiving the data frame from the leaf client, forwarding the data frame according to the static forwarding table.
  • the embodiment of the present invention further provides a device for a virtual private local area network service VPLS, including: a receiving unit, configured to receive a static MAC address installation message, where the static MAC address installation message includes a media corresponding to the multicast source port of the VPLS Accessing a control MAC address; a parsing unit, configured to parse the static MAC address installation message to obtain the MAC address; an installation unit, configured to install the MAC address to a static forwarding table; and a forwarding unit, configured to receive from the leaf client When the data frame is received, the data frame is forwarded according to the static forwarding table.
  • a receiving unit configured to receive a static MAC address installation message, where the static MAC address installation message includes a media corresponding to the multicast source port of the VPLS Accessing a control MAC address
  • a parsing unit configured to parse the static MAC address installation message to obtain the MAC address
  • an installation unit configured to install the MAC address to a static forwarding table
  • the embodiment of the present invention further provides a system for a virtual private local area network service VPLS, including: a root operation edge device, a root PE, configured to send a static MAC address installation message, where the static MAC address installation message includes the multicast source port of the VPLS Corresponding media access control MAC address; a leaf operation edge device Leaf PE, configured to receive and parse the static MAC address installation message, obtain the MAC address; and use the MAC address to install the static forwarding table; When the client receives the data frame, the data frame is forwarded according to the static forwarding table.
  • the embodiment of the present invention further provides a virtual private local area network service (VPLS) device, configured to send a static MAC address installation message, where the static MAC address installation message includes a media access control MAC address corresponding to the multicast source port of the VPLS.
  • VPLS virtual private local area network service
  • each leaf PE can support the VPLS multicast service without modifying its forwarding plane, thereby reducing the equipment cost. Therefore, the traditional VPLS PE device can implement VPLS multicast immediately. It is compatible with the PEs in the original VPLS multicast model and can be implemented on the PEs of the general forwarding plane. This facilitates the seamless upgrade of the VPLS network and reduces the complexity of network upgrade deployment.
  • FIG. 1 is a flowchart of a method for forwarding a data frame of a virtual private local area network service VPLS according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an application network scenario according to an embodiment of the present invention.
  • FIG. 3 is a message format diagram of an extended static MAC address installation under the LDP protocol according to an embodiment of the present invention
  • FIG. 4 is a message format diagram of a static MAC address deletion extended under the LDP protocol according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of an example of a scenario of active/standby protection and load balancing according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a device of a virtual private local area network service VPLS according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a system of a virtual private local area network service VPLS according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. As shown in FIG.
  • a method for forwarding a data frame of a virtual private local area network service VPLS includes: receiving a static MAC address installation message, where the static MAC address installation message includes a multicast source port of the VPLS. Corresponding media access control MAC address; parsing the static MAC address installation message to obtain the MAC address; installing the MAC address to a static forwarding table; when receiving a data frame from a leaf client, forwarding the location according to the static forwarding table The data frame.
  • each leaf PE can support the VPLS multicast service without modifying the forwarding plane, which reduces the equipment cost. Therefore, the VPLS peering can be implemented on the VPLS network.
  • the VPLS network can be implemented on the PEs of the original VPLS multicast model.
  • the seam upgrade reduces the complexity of network upgrade deployment.
  • FIG. 2 In the figure, PE1, PE2, and PE3 form a VPLS network, and the Ethernet multicast source R is connected to PE1. Therefore, PE1 is a Root PE, and two The multicast leaves L1 and L2 are connected to the leaves PE2 and PE3, respectively.
  • a multicast tree PW0 is set up between PE1 and PE2 and PE3, and a unicast PW (PW1 and PW2) is established between PE1 and PE2, PE1 and PE3, and between PE2 and PE3.
  • PW PW3
  • the PE1 sends a static MAC address installation message to the PE2 and the PE3 through the management plane command through the control plane or the network management platform, and advertises the MAC address corresponding to the R source of the multicast source. Point-to-point pseudowire PW1 or PW2 information).
  • PE2 and PE3 After receiving the static MAC address installation message, PE2 and PE3 parse the static MAC address installation message, and determine whether the static MAC address installation message includes the P2P PW information associated with the MAC address. If the determination result is yes, The MAC address and the P2P PW information are sent to the static forwarding table.
  • the root operating edge device Roo t PE address that sends the static MAC address installation message or the Roo PE carried in the static MAC address installation message is installed.
  • Address obtain P2P PW information associated with the MAC address; install the MAC address and P2P PW information to the static forwarding table.
  • the Ethernet multicast source R in the figure may not be an end user (or server), but a bridge device through which multiple terminal users (or servers) can access PE1.
  • PE1 needs to advertise the MAC address list corresponding to these end users (or servers) to all leaf PEs through management plane commands through control signaling or network management platform.
  • a leaf (L1) sends an Ethernet unicast frame whose destination address is the MAC address of the Ethernet multicast source R port to the PE2 VS I forwarder, in the MAC address lookup, the static process is installed through the above process.
  • the forwarding entry gets its associated P2P pseudowire PW1, and then the Ethernet unicast frame is transmitted through the PW1.
  • the PW label (PW1 label) of the P2P is first inserted, and then encapsulated by the P2P LSP tunnel, and then transmitted to the Roo t PE (PEl) through the point-to-point pseudowire PW1, and the PE1 according to the MAC address
  • the Ethernet unicast frame is sent to the corresponding Roo t port.
  • the second embodiment of the present invention provides a MAC address deletion process of an Ethernet multicast source.
  • the root PE sends a static MAC address deletion message through the management plane command through the control signaling or the network management platform, and the original Ethernet multicast source port is used.
  • the corresponding MAC address advertises all leaf PEs. After receiving the delete message, the leaf PE deletes the advertised MAC address entry from the static forwarding table.
  • the Root PE can also send a static MAC address reinstallation message through the management plane command through the control signaling or the network management platform, and the new Ethernet is added.
  • the MAC address corresponding to the multicast source port advertises all leaf PEs. After receiving the message, each leaf PE deletes the advertised MAC address entry from the static forwarding table and installs the association with the new Ethernet multicast source port. New static forwarding entry.
  • the embodiment of the present invention implements a method for implementing MAC address installation and deletion by extending LDP signaling.
  • LDP is the main signaling for establishing a PW, so it is taken as an example for illustration.
  • BGP Border Gateway Protocol
  • FIG. 3 and FIG. 4 two types of message formats, namely, static MAC address installation and static MAC address deletion, which are extended under the LDP protocol, are respectively provided.
  • the PW information can be carried on the option parameter field of the message.
  • the message format for static MAC address reinstallation is similar.
  • the Root PE can pass the message format of FIG.
  • Send a static MAC address to install the message, ie, through a TLV (Type Length Va lue , type The length value) carries the MAC address table corresponding to one or more Ethernet multicast source ports to be advertised, and optionally carries a TLV option to carry the PW information corresponding thereto.
  • the leaf PE After receiving the static MAC address installation message, the leaf PE parses the message and the TLV it carries. First, it parses the MAC address set corresponding to the Ethernet multicast source port. If the message carries the option TLV containing the PW information, Then, the corresponding ⁇ Roo t MAC, PW> is installed as a MAC forwarding entry to the static forwarding table. Otherwise, it obtains the unique P2P PW information corresponding to the IP address according to the Root PE address (source IP address) of the root service edge device that sends the static MAC address installation message or the Root PE address carried in the static MAC address installation message; Finally, ⁇ Root MAC, PW> is installed as a MAC forwarding entry to the static forwarding table.
  • the RooT PE can send a static MAC address deletion message through the message format of FIG. 4, that is, a MAC address table corresponding to one or more Ethernet multicast source ports to be advertised by one TLV.
  • the leaf PE parses the message and the TLV carried by the leaf PE to obtain the MAC address table corresponding to the Ethernet multicast source port, and then the corresponding one or more MAC forwarding entries are static. Deleted in the forwarding table.
  • Another embodiment of the present invention provides a VPLS multicast implementation under Root Active/Standby protection and load sharing. As shown in Figure 5, two multicast source root devices and multiple leaf devices access the VPLS network through the PE device, and two multicast trees are configured for the client's multicast service in the VPLS network.
  • Root Active/Standby protection mode one root is generally designated as the working root and the other root is used as the protection root. Normally, only the working root performs multicast, and the protection Roo does not provide multicast services. Before the multicast service is provided, the working root PE installs its own static MAC address entry on all leaf PEs to associate with the PW corresponding to itself according to the process described in the foregoing embodiment. At times, only the working Root PE can receive unicast packets sent by the leaf. Once the working root fails (for example, if the device fails or the access link fails), then the protection root takes over to provide the multicast service.
  • the protection root PE sends a re-installation message according to the process of the foregoing embodiment, and installs a new static MAC address entry on each leaf PE to associate it with a new PW corresponding to itself, and sends the unicast message of the leaf PE. Go to the protection root.
  • two (or more) roots can simultaneously provide multicast services, and can also process unicast packets from leaves.
  • the root PE or the network management platform installs a static MAC address entry corresponding to the root 1 on the leaf PE, and the static MAC address entry corresponding to the root 2 is installed on the other leaf PE.
  • each leaf PE is directed to two different Root PEs, so that one root is part of the leaf service, and the other root is the other part of the leaf service.
  • the signaling can be in the form of a message as in the above embodiment. If it is a point-to-point control channel, you only need to provide the corresponding MAC address and PW. If it is a broadcast control channel (such as BGP), you need to carry the leaf group information in the signaling (for example, only install to leaf group 1). Installed only in leaf group 2 or in the entire leaf group, so that the leaf PE can determine whether to install a static MAC address entry based on the leaf group information and its own leaf group ID. Only the leaf group information matches its leaf group ID.
  • the E-Tree service defined by the MEF organization of the Metro Ethernet Forum (E-Tree is a generic new service defined by the MEF). It is an important application scenario of the VPLS multicast technology. It has the following features: Root to Leaf One-to-many relationship, and there may be multiple Root devices; Root can send traffic to any Root and Leaf, Leaf can also be sent to any Root; Leaf and Leaf can't connect, need stream isolation.), its leaf and There can be no flow communication between the leaves, and traffic isolation is required, and the leaf can only send the text to one or more Roots.
  • a special static forwarding entry is installed on the VSI of all leaf PEs before the service is transmitted. Associated with one or more PWs, each PW corresponds to a Root PE); when the VSI of the leaf PE receives a multicast, broadcast frame, or unicast frame of an unknown destination address from the leaf client, the special static forwarding table is adopted. The item is forwarded to the frame. In this way, the leaf PEs are not flooded with each other, and the leaf isolation is realized on the one hand, and the MAC addresses of other leaves are avoided on the other hand, thereby improving the scalability of the network.
  • the installation and deletion of this special static forwarding entry can use the following methods: For example, the value of the MAC address is 0 or other special value indicates the special entry, and the static MAC address installation message carries one or more PW information. . When a static MAC installation message is received and its MAC address value is 0 or other special value, the corresponding special static forwarding entry is installed. When a static MAC address deletion message is received and its MAC address value is 0 or other special value, the special static forwarding entry is deleted.
  • each leaf PE can support the VPLS multicast service without modifying the forwarding plane, thereby reducing the equipment cost. Therefore, the VPLS peering can be implemented on the VPLS network.
  • the VPLS network can be implemented on the PEs of the original VPLS multicast model.
  • the seam upgrade reduces the complexity of network upgrade deployment.
  • an embodiment of the present invention further provides a device for a virtual private local area network service (VPLS), including:
  • a receiving unit configured to receive a static MAC address installation message, where the static MAC address installation message includes a media access control MAC address corresponding to the multicast source port of the VPLS;
  • parsing unit configured to parse the static MAC address installation message to obtain the MAC address
  • installation unit configured to install the MAC address to a static forwarding table
  • a forwarding unit configured to forward the data frame according to the static forwarding table when receiving a data frame from the leaf client.
  • a device for a virtual private local area network service (VPLS) in addition to the unit shown in FIG. 6, the device further includes: a determining unit, configured to determine whether the static MAC address installation message includes the point-to-point pseudowire P2P PW information associated with the MAC address, and if the determining result is yes, the installing unit is specifically configured to install the MAC address And the P2P PW information is sent to the static forwarding table.
  • the forwarding unit is specifically configured to forward the unicast frame by using the P2P PW when receiving a unicast frame from a leaf client.
  • a device for a virtual private local area network service (VPLS) according to another embodiment of the present invention, in addition to the unit shown in FIG. 6, the device further includes:
  • a determining unit configured to determine whether the static MAC address installation message includes P2P PW information associated with the MAC address
  • An obtaining unit configured to: when the judgment result of the determining unit is no, obtain the root PE edge address of the static MAC address installation message or the Root PE address carried in the static MAC address installation message, The P2P PW information associated with the MAC address; the installation unit is specifically configured to install the MAC address and the P2P PW information to the static forwarding table; and the forwarding unit is specifically configured to receive from a leaf client When the frame is unicast, the unicast frame is forwarded through the P2P PW.
  • a device for a virtual private local area network service VPLS according to another embodiment of the present invention has the unit shown in FIG.
  • the static MAC address installation message further includes one or more P2P PW information associated with the special MAC address, where each P2P PW corresponds to a Root PE, and the static transfer Publish a special static forwarding entry,
  • the forwarding unit is specifically configured to: when the unicast frame of the multicast frame, the broadcast frame, or the unknown destination address is received from the leaf client, forward the multicast frame, the broadcast frame, or the unknown destination address by using the special static forwarding entry.
  • Unicast frame
  • another embodiment of the present invention further provides a system for virtual private local area network service VPLS.
  • System including:
  • the root operating edge device Root PE is configured to send a static MAC address installation message, where the static MAC address installation message includes a media access control MAC address corresponding to the multicast source port of the VPLS;
  • Leaf PE configured to receive and parse the static MAC address installation message, obtain the MAC address, and use the MAC address to install the static forwarding table; when receiving the data frame from the leaf client, The static forwarding table forwards the data frame.
  • Another embodiment of the present invention further provides a system for a virtual private local area network service VP LS, which has the device shown in FIG. 7 , wherein the leaf operation edge device Leaf PE is further used to determine whether the static MAC address installation message is Including a point-to-point pseudowire P2P PW information associated with the MAC address, if the determination result is yes, installing the MAC address and the P2P PW information to the static forwarding table; when receiving a unicast from a leaf client At the time of the frame, the unicast frame is forwarded through the P2P PW.
  • the leaf operation edge device Leaf PE is further used to determine whether the static MAC address installation message is Including a point-to-point pseudowire P2P PW information associated with the MAC address, if the determination result is yes, installing the MAC address and the P2P PW information to the static forwarding table; when receiving a unicast from a leaf client At the time of the frame, the unicast frame is forwarded through the P2P P
  • Another embodiment of the present invention further provides a system for a virtual private local area network service VP LS, which has the device shown in FIG. 7 , wherein the leaf operation edge device Leaf PE is further used to determine whether the static MAC address installation message is Including P2P PW information associated with the MAC address, if the judgment result is no,
  • Another embodiment of the present invention further provides a system for a virtual private local area network service VP LS, which has the device shown in FIG. 7, wherein if the MAC address is a special value, the static MAC address installation message further includes One or more pieces of P2P PW information associated with the special MAC address, where each P2P PW corresponds to a Root PE, The leaf operation edge device Leaf PE is specifically configured to install the special MAC address and the P2P PW information to the static forwarding table to obtain a special static forwarding entry.
  • the unicast frame of the multicast frame, the broadcast frame, or the unknown destination address is received from the leaf client, the unicast frame of the multicast frame, the broadcast frame, or the unknown destination address is specifically forwarded by using the special static forwarding entry. .
  • Another embodiment of the present invention further provides a device for a virtual private local area network service (VPLS), configured to send a static MAC address installation message, where the static MAC address installation message includes a media access control MAC corresponding to the multicast source port of the VPLS. address.
  • VPLS virtual private local area network service
  • the description of the method embodiment of the present invention is omitted because it is based on the same concept as the method embodiment of the present invention.
  • the above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

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Abstract

本发明实施例公开了虚拟专用局域网业务VPLS的数据帧的转发方法、设备和系统，包括：接收静态MAC地址安装消息，所述静态MAC地址安装消息包含所述VPLS的组播源端口所对应的媒体访问控制MAC地址；解析所述静态MAC地址安装消息获取所述MAC地址；安装所述MAC地址到静态转发表；当从叶子客户接收到数据帧时，根据所述静态转发表转发所述数据帧。每个叶子PE无需修改转发平面，即可支持VPLS组播业务，降低了设备成本。有利于实现VPLS网络的无缝升级，又降低了网络升级部署的复杂性。

Description

虚拟专用局域网业务 VPLS的数据帧的转发方法、 设备和系统
技术领域 本发明涉及通信技术领域， 尤其涉及一种虚拟专用局域网业务 VP LS的数 据帧的转发方法、 设备和系统。
背景技术
VPLS ( Virtual Private Local Area Network Service, 虚拟专用局域网业 务）是一种利用 WAN ( Wide Area Network, 广域网） 架构来虚拟以太局域 网的技术。 它能够在 MPLS ( Multi - Protocol Label Switching, 多协议标签交 换） 网络上提供类似于 LAN ( Local Area Network, 局域网）的多点到多点连 接， 便于用户从多个地理位置分散的点同时接入 MPLS网络， 并相互访问， 就 像这些点直接接入到 LAN上一样。 由于目前核心网络主要都釆用 IP/MPLS技 术， 所以通过 VPLS来提供虚拟以太网业务的需求越来越多， 其部署也已经非 常广泛。
当以太网业务为组播业务或者当以太帧的目的地址未知时， 传统 VPLS通 常釆用复制转发的方法， 即 Root PE ( Provider Edge, 运营边缘设备）将以 太帧复制多份并通过点对点的 PW ( Pseudo Wire, 伪线）向每个对端 PE发送 一份拷贝。 但是在这种方式下， VPLS网络带宽消耗正比于叶子 PE的数量， 因 此， 其网络扩展性受到极大限制， 网络运营成本很高。 另外 VPLS的 VSI ( Virtual Switch Instance, 虚拟交换实例 )转发器， 通常 釆用了类似于传统以太网的自学习机制，其过程是，当一个以太帧通过一条 PW 到达 VSI转发器， 并且该帧的源 MAC地址未知， 那么该地址就与该 PW关联在 一起， 作为转发表项保存在 VSI转发器的 MAC转发表中， 以后 VSI转发器发送 到该地址的帧就通过该 PW来传送。 在 IETF的 L2VPN工作组， 目前有一篇工作组文稿讨论了 L2VPN的组播相 关技术（ draft-ietf-l2vpn-vpls-mcast-05 ) , 它描述了一种通过 VPLS网络进行 组播的技术。 其正向， 即由 Root PE传送到叶子 PE的方向， 组播和未知单播地 址的以太帧的洪泛都通过一种特殊构造的组播树 （通常为点到多点 P2MP的 PW )来传送到所有叶子， 而已知单播地址的以太帧则仍然通过点对点的 P2P PW进行传送。 但其反向， 即由叶子传送到 Root PE的方向， 则还都是通过 P2P PW传送数据帧。 在实现本发明的过程中， 发明人发现该现有技术存在如下缺陷： 由于正向组播和反向单播的不对称， 叶子 PE无法正常地通过 MAC地址自 学习来构造其二层转发表， 因此， 叶子 PE需要在转发平面修改自学习机制， 需 要所有叶子 PE支持新的以太转发平面。 这就需要设计和开发新的转发引擎， PE设备成本很高。 发明内容 本发明的实施例提供了一种虚拟专用局域网业务 VPLS的数据帧的转发方 法、 设备和系统， 以使每个叶子 PE无需修改其转发平面， 即可支持 VPLS组播 业务， 降低设备成本。 本发明实施例提供一种虚拟专用局域网业务 VP LS的数据帧的转发方法， 包括： 接收静态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所述 VPLS的组播源端口所对应的媒体访问控制 MAC地址； 解析所述静态 MAC地址 安装消息获取所述 MAC地址； 安装所述 MAC地址到静态转发表； 当从叶子客 户接收到数据帧时， 根据所述静态转发表转发所述数据帧。 本发明实施例还提供一种虚拟专用局域网业务 VPLS的设备， 包括： 接收 单元， 用于接收静态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所 述 VPLS的组播源端口所对应的媒体访问控制 MAC地址； 解析单元， 用于解析 所述静态 MAC地址安装消息获取所述 MAC地址；安装单元，用于安装所述 MAC 地址到静态转发表； 转发单元， 用于当从叶子客户接收到数据帧时， 根据所述 静态转发表转发所述数据帧。 本发明实施例还提供一种虚拟专用局域网业务 VPLS的系统， 包括： 根运 营边缘设备 Root PE, 用于发送静态 MAC地址安装消息， 所述静态 MAC地址安 装消息包含所述 VPLS的组播源端口所对应的媒体访问控制 MAC地址； 叶子运 营边缘设备 Leaf PE, 用于接收、 解析所述静态 MAC地址安装消息， 获取所述 MAC地址； 并用于安装所述 MAC地址到静态转发表； 当从叶子客户接收到数 据帧时， 根据所述静态转发表转发所述数据帧。 本发明实施例还提供一种虚拟专用局域网业务 VPLS的设备， 用于发送静 态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所述 VPLS的组播源端 口所对应的媒体访问控制 MAC地址。 使用本发明实施例的方法， 每个叶子 PE无需修改其转发平面， 即可支持 VPLS组播业务， 降低了设备成本。 从而既能够使得传统的 VPLS PE设备能够 立即实现 VPLS组播。 它既能兼容于原有 VPLS组播模型下的 PE设备， 也能够 在一般转发平面的 PE上进行实现， 有利于实现 VPLS网络的无缝升级， 又降低 了网络升级部署的复杂性。
附图说明 为了更清楚地说明本发明实施例的技术方案， 下面将对实施例描述中所需 要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本发明的 一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下， 还可以根据这些附图获取其他的附图。
图 1是本发明一实施例提供的一种虚拟专用局域网业务 VPLS的数据帧 的转发方法的流程图；
图 2是本发明一实施例的应用网络场景示意图；
图 3是本发明一实施例 LDP协议下扩展的静态 MAC地址安装的消息格式示 意图；
图 4是本发明一实施例 LDP协议下扩展的静态 MAC地址删除的消息格式示 意图；
图 5是本发明一实施例在主备保护和负载分担下的场景实例示意图； 图 6是本发明一实施例提供的一种虚拟专用局域网业务 VPLS的设备示意 图；
图 7是本发明一实施例提供的一种虚拟专用局域网业务 VPLS的系统示意 图。 具体实施方式 下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出创造 性劳动前提下所获取的所有其他实施例， 都属于本发明保护的范围。 如图 1所示， 本发明实施例提供的虚拟专用局域网业务 VPLS的数据帧的转 发方法， 包括： 接收静态 MAC地址安装消息， 所述静态 MAC地址安装消息包 含所述 VPLS的组播源端口所对应的媒体访问控制 MAC地址； 解析所述静态 MAC地址安装消息获取所述 MAC地址； 安装所述 MAC地址到静态转发表； 当 从叶子客户接收到数据帧时， 根据所述静态转发表转发所述数据帧。 使用该方 法， 每个叶子 PE无需修改转发平面， 即可支持 VPLS组播业务， 降低了设备成 本。 从而既能够使得传统的 VPLS PE设备能够立即实现 VPLS组播， 既能兼容 于原有 VPLS组播模型下的 PE设备， 也能够在一般转发平面的 PE上进行实现， 有利于实现 VPLS网络的无缝升级， 又降低了网络升级部署的复杂性。 下面通过如图 2所示的一个网络场景来加以详细说明本发明实施例， 图中， PE1、 PE2和 PE3构成一个 VPLS网络， 以太组播源 R连接到 PE1 , 因此 PE1为 Root PE, 两个组播叶子 L1和 L2分别连接到叶子 PE2和 PE3。 在提供组播业务 前， 在 PE1到 PE2和 PE3之间建立一棵组播树 PW0, 并且在 PE1和 PE2、 PE1 和 PE3之间分别建立单播 PW ( PW1和 PW2 ) , PE2和 PE3之间可以建立 PW ( PW3 ) , 也可以不建立 PW。 在优选的实现方式下， PE1通过控制信令或网 络管理平台通过管理平面命令向 PE2和 PE3分别发送静态 MAC地址安装消息， 通告组播源 R端口所对应的 MAC地址 (同时还可以选择性通告点对点伪线 PW1 或 PW2的信息）。 当 PE2和 PE3接收到该静态 MAC地址安装消息后， 解析该静 态 MAC地址安装消息， 判断该静态 MAC地址安装消息是否包含与该 MAC地址 关联的点对点伪线 P2P PW信息， 如果判断结果为是， 则安装该 MAC地址和 P2P PW信息到静态转发表； 判断结果为否， 则根据发送该静态 MAC地址安装 消息的根运营边缘设备 Roo t PE地址或者该静态 MAC地址安装消息中携带的 Roo t PE地址， 获取与该 MAC地址关联的 P2P PW信息； 安装该 MAC地址和 P2P PW信息 到静态转发表。 另外， 图中的以太组播源 R可能不是终端用户 （或服务器） ， 而是一台网 桥设备， 多个终端用户 （或服务器）可以通过该网桥设备接入到 PE1。 此时， PE1需要将这些终端用户 （或服务器）所对应的 MAC地址列表通过控制信令或网 络管理平台通过管理平面命令通告到所有叶子 PE上。 若有一个叶子（ L1 )发送的目的地址为以太组播源 R端口对应 MAC地址的以 太单播帧进入 PE2的 VS I转发器， 在 MAC地址查找中， 通过上述过程安装的静态 转发表项得到其关联的 P2P伪线 PW1 , 然后将该以太单播帧通过该 PW1进行传送。 具体可以为： 在分组封装时， 首先插入 P2P的 PW标签（PW1标签）， 然后经过 P2P 的 LSP隧道封装， 再通过点对点伪线 PW1传送到 Roo t PE ( PEl )上， PE1根据 MAC 地址将该以太单播帧发送到相应的 Roo t端口。 本发明实施例二给出了以太组播源的 MAC地址删除过程。 当以太网组播业 务停止， 或者以太组播源的接入拓朴发生变化时， Root PE通过控制信令或者 网络管理平台通过管理平面命令发送静态 MAC地址删除消息， 将原以太组播源 端口所对应的 MAC地址通告所有叶子 PE , 叶子 PE接收到删除消息后， 将所通告 的 MAC地址表项从静态转发表中删除。 当以太组播源的接入拓朴发生变化时， 在优化的实现方式下， 上述 Root PE 也可以通过控制信令或者网络管理平台通过管理平面命令发送静态 MAC地址重 安装消息， 将新的以太组播源端口所对应的 MAC地址通告所有叶子 PE , 每个叶 子 PE接收到该消息后， 将所通告的 MAC地址表项从静态转发表中删除， 并安装 与新的以太组播源端口关联的新静态转发表项。 本发明实施例通过扩展 LDP信令来实现 MAC地址安装和删除的实现方法。 目 前 LDP是建立 PW的主要信令， 因此以它为例加以说明。 但是本发明所描述的机 制同样也适用于 BGP ( Border Ga teway Protoco l , 边界网关协议） 等其它路 由信令协议上。 如图 3和图 4所示， 分别给出了 LDP协议下扩展的静态 MAC地址安装和静态 MAC地址删除两种类型的消息格式。 可选性地， PW信息可以携带在消息的选项 参数字段上。 静态 MAC地址重安装的消息格式与此类似。 首先， 当一个支持组播的 VPLS在所有 PE之间建立 PW时， 若 Roo t PE与叶子 PE是通过 LDP信令建立它们之间的以太网伪线， 则 Root PE可通过图 3的消息格 式发送静态 MAC地址安装消息， 即， 通过一个 TLV ( Type Leng th Va lue , 类型 长度值）携带所要通告的一个或多个以太组播源端口所对应的 MAC地址表， 它 还可选择进一步携带一个 TLV选项， 携带它所对应的 PW信息。 当 Leaf PE接收到静态 MAC地址安装消息后， 解析该消息以及它所携带的 TLV, 首先它解析得到以太组播源端口所对应的 MAC地址集， 若消息中携带有包 含 PW信息的选项 TLV, 则将相应的 <Roo t MAC, PW>作为 MAC转发表项安装到静态 转发表。 否则， 它根据发送该静态 MAC地址安装消息的根运营边缘设备 Root PE 地址（源 IP地址）或者该静态 MAC地址安装消息中携带的 Root PE地址， 获取对 应于该 IP地址的唯一 P2P PW信息； 最后将 <Root MAC, PW>作为 MAC转发表项安 装到静态转发表。 若 MAC地址集包含多个地址， 则按上述过程安装多个静态转 发表项。 当组播业务停止时， Roo t PE可通过图 4的消息格式发送静态 MAC地址删除 消息， 即， 通过一个 TLV携带所要通告的一个或多个以太组播源端口对应的 MAC 地址表。 当 Leaf PE接收到静态 MAC地址删除消息后， 解析该消息以及它所携带的 TLV,得到以太组播源端口所对应的 MAC地址表，然后将所对应的一个或多个 MAC 转发表项从静态转发表中删除。 本发明又一实施例给出了在 Root主备保护以及负载分担下的 VPLS组播实 施例。 如图 5所示， 两个组播源 Root设备和多个 leaf设备分别通过 PE设备接入 VPLS网络， 并且在 VPLS网络中为该客户的组播业务配置了两棵组播树， 通过它
在 Root主备保护模式下， 一般指定一个 Root作为工作 Root , 而另一个 Root 作为保护 Root。 正常情况下， 只有工作 Root进行组播， 而保护 Roo t并不提供组 播服务。 在提供组播业务之前， 工作 Root PE按照上述实施例所述过程在所有 叶子 PE上安装自己的静态 MAC地址表项使其关联到对应于自己的 PW, 这样， 正 常时只有工作 Root PE能够接收到叶子所发送的单播报文。 一旦工作 Root出现 故障（例如， 设备出现故障或者接入链路出现故障） ， 那么保护 Root则接替提 供组播服务。 同时， 保护 Root PE按照上述实施例过程发送重安装消息并在每 个叶子 PE上安装新的静态 MAC地址表项， 使其关联到对应于自己的新 PW, 并使 得叶子 PE的单播报文发送到保护 Root上。 在 Root负载分担模式下， 两个（或更多个） Root同时能够提供组播业务， 也都能够处理来自叶子的单播报文。 在提供组播业务之前， Root PE或者网络 管理平台在一部分叶子 PE上安装对应于 Root l的静态 MAC地址表项， 而在另一部 分叶子 PE上则安装对应于 Root2的静态 MAC地址表项， 从而使得各个 leaf PE的 反向单播路径分别指向两个不同的 Root PE , 从而达到一个 Root为一部分 leaf 服务， 而另一个 Root则为另一部分 leaf服务的目的。 信令可以釆用如上述实施 例的消息形式。 如果是点对点的控制信道， 则只需要提供相应的 MAC地址和 PW 即可； 如果是广播控制信道（例如 BGP ) , 则还需要在信令中携带叶子组信息 (例如只安装到叶子组 1 , 只安装到叶子组 2 , 或者安装到全体叶子组） ， 以便 叶子 PE能够根据叶子组信息和自己的叶子组 ID来决定是否安装静态 MAC地址表 项， 只有叶子组信息和其叶子组 ID匹配的那些叶子 PE才安装相应的转发表项。 通过上述实施例， 本发明实施例能很容易的实现 Root的主备保护和负载分 担。 对于城域以太网论坛 MEF组织定义的 E-Tree业务（ E-Tree是 MEF定义的一种 通用的新业务， 是 VPLS组播技术的一种重要应用场景， 它具有如下特性： Root 到 Leaf为一对多关系， 并可能存在多个 Root设备； Root可发送信流到任意 Root 和 Leaf , Leaf也可发送到任何 Root ; Leaf和 Leaf之间不能连通， 需要信流隔 离。 ) , 其 leaf和 leaf之间不能有信流连通， 需要进行信流隔离， 而叶子只可 以将 文发送到一个或多个 Root。 这可以通过本实施例的方法来加以解决： 首 先，在业务传送之前， 在所有叶子 PE的 VSI上安装一条特殊的静态转发表项（它 关联于一条或多条 PW, 每条 PW对应于一个 Root PE ) ； 当叶子 PE的 VSI从叶子客 户接收到组播、 广播帧或未知目的地址的单播帧时， 则通过上述特殊静态转发 表项对该帧进行转发。 这样一来， 各个叶子 PE相互之间无分组洪泛， 一方面实 现了叶子隔离， 另一方面避免学习到其它叶子的 MAC地址， 提高了网络的扩展 性。 这种特殊静态转发表项的安装和删除可以釆用如下方法： 例如， 令 MAC地 址的数值为 0或其他特殊值表示这种特殊表项， 而静态 MAC地址安装消息携带一 条或多条 PW信息。 当接收到静态 MAC安装消息， 并且其 MAC地址数值为 0或其他 特殊值， 则安装相应的特殊静态转发表项。 当接收到静态 MAC地址删除消息， 并且其 MAC地址数值为 0或其他特殊值， 则将该特殊静态转发表项删除。 使用本发明实施例的方法，每个叶子 PE无需修改转发平面，即可支持 VPLS 组播业务， 降低了设备成本。 从而既能够使得传统的 VPLS PE设备能够立即实 现 VPLS组播， 既能兼容于原有 VPLS组播模型下的 PE设备， 也能够在一般转 发平面的 PE上进行实现， 有利于实现 VPLS网络的无缝升级， 又降低了网络升 级部署的复杂性。
如图 6所示， 本发明一实施例还提供一种虚拟专用局域网业务 VPLS的设 备， 包括：
接收单元， 用于接收静态 MAC地址安装消息， 所述静态 MAC地址安装消 息包含所述 VPLS的组播源端口所对应的媒体访问控制 MAC地址；
解析单元， 用于解析所述静态 MAC地址安装消息获取所述 MAC地址； 安装单元， 用于安装所述 MAC地址到静态转发表；
转发单元， 用于当从叶子客户接收到数据帧时， 根据所述静态转发表转发 所述数据帧。
本发明另一实施例提供的一种虚拟专用局域网业务 VPLS的设备， 除了具 有图 6所示的单元， 所述设备还包括： 判断单元， 用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地 址关联的点对点伪线 P2P PW信息， 如果所述判断结果为是， 则所述安装单元 具体用于安装所述 MAC地址和所述 P2P PW信息到所述静态转发表； 所述转发 单元具体用于当从叶子客户接收到单播帧时， 通过所述 P2P PW转发所述单播 帧。
本发明另一实施例提供的一种虚拟专用局域网业务 VPLS的设备， 除了具 有图 6所示的单元， 所述设备还包括：
判断单元， 用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地 址关联的 P2P PW信息，
获取单元， 用于当所述判断单元的判断结果为否时， 根据发送所述静态 MAC地址安装消息的根运营边缘设备 Root PE地址或者所述静态 MAC地址安 装消息中携带的 Root PE地址， 获取与所述 MAC地址关联的 P2P PW信息； 所述安装单元具体用于安装所述 MAC地址和所述 P2P PW信息到所述静 态转发表； 所述转发单元， 具体用于当从叶子客户接收到单播帧时， 通过所述 P2P PW转发所述单播帧。
本发明另一实施例提供的一种虚拟专用局域网业务 VPLS的设备具有图 6 所示的单元， 其中，
如果所述 MAC地址为特殊值， 所述静态 MAC地址安装消息还包含与所述 特殊 MAC地址关联的一条或多条 P2P PW信息， 所述每条 P2P PW对应于一个 Root PE, 所述静态转发表得到特殊静态转发表项，
所述转发单元具体用于当从叶子客户接收到组播帧、 广播帧或未知目的地 址的单播帧时， 通过所述特殊静态转发表项转发所述组播帧、 广播帧或未知目 的地址的单播帧。
如图 7所示， 本发明另一实施例还提供一种虚拟专用局域网业务 VPLS的系 统， 包括：
根运营边缘设备 Root PE , 用于发送静态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所述 VPLS的组播源端口所对应的媒体访问控制 MAC 地址；
叶子运营边缘设备 Leaf PE, 用于接收、解析所述静态 MAC地址安装消息， 获取所述 MAC地址； 并用于安装所述 MAC地址到静态转发表； 当从叶子客户 接收到数据帧时， 根据所述静态转发表转发所述数据帧。
本发明另一实施例还提供一种虚拟专用局域网业务 VP LS的系统， 具有如 图 7所示的设备， 其中， 所述叶子运营边缘设备 Leaf PE还用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地址关联的点对点伪线 P2P PW信 息， 如果所述判断结果为是， 则安装所述 MAC地址和所述 P2P PW信息到所述 静态转发表； 当从叶子客户接收到单播帧时， 通过所述 P2P PW转发所述单播 帧。
本发明另一实施例还提供一种虚拟专用局域网业务 VP LS的系统， 具有如 图 7所示的设备， 其中， 所述叶子运营边缘设备 Leaf PE还用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地址关联的 P2P PW信息， 如果所述 判断结果为否，
则根据发送所述静态 MAC地址安装消息的根运营边缘设备 Root PE地址 或者所述静态 MAC地址安装消息中携带的 Root PE地址，获取与所述 MAC地址 关联的 P2P PW信息；
安装所述 MAC地址和所述 P2P PW信息到所述静态转发表； 当从叶子客 户接收到单播帧时， 根据所述 P2P PW转发所述单播帧。
本发明另一实施例还提供一种虚拟专用局域网业务 VP LS的系统， 具有如 图 7所示的设备， 其中， 如果所述 MAC地址为特殊值， 所述静态 MAC地址安装 消息还包含与所述特殊 MAC地址关联的一条或多条 P2P PW信息， 所述每条 P2P PW对应于一个 Root PE, 则所述叶子运营边缘设备 Leaf PE具体用于安装所述特殊 MAC地址和所述 P2P PW信息到所述静态转发表得到特殊静态转发表项 ,
当从叶子客户接收到组播帧、 广播帧或未知目的地址的单播帧时， 具体用 于通过所述特殊静态转发表项转发所述组播帧、 广播帧或未知目的地址的单播 帧。
本发明另一实施例还提供一种虚拟专用局域网业务 VPLS的设备， 用于发 送静态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所述 VPLS的组播 源端口所对应的媒体访问控制 MAC地址。 上述装置各组成部分之间具体的信号处理、 执行过程等内容， 由于与本发 明方法实施例基于同一构想，可参见本发明方法实施例的叙述，此处不再赘述。 以上所述， 仅为本发明较佳的具体实施方式， 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 想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护 范围应该以权利要求的保护范围为准。

Claims

权 利 要求
1、 一种虚拟专用局域网业务 VPLS的数据帧的转发方法， 其特征在于， 包 括：
接收静态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所述 VPLS 的组播源端口所对应的媒体访问控制 MAC地址；
解析所述静态 MAC地址安装消息获取所述 MAC地址；
安装所述 MAC地址到静态转发表；
当从叶子客户接收到数据帧时， 根据所述静态转发表转发所述数据帧。
2、根据权利要求 1所述的转发方法， 其特征在于， 解析所述静态 MAC地址 安装消息后， 所述方法还包括： 判断所述静态 MAC地址安装消息是否包含与所 述 MAC地址关联的点对点伪线 P2P PW信息， 如果所述判断结果为是， 则所述 安装所述 MAC地址到静态转发表； 当从叶子客户接收到数据帧时， 根据所述静 态转发表转发所述数据帧具体为： 安装所述 MAC地址和所述 P2P PW信息到 所述静态转发表； 当从叶子客户接收到单播帧时， 通过所述 P2P PW转发所述 单播帧。
3、根据权利要求 1所述的转发方法， 其特征在于， 解析所述静态 MAC地址 安装消息后， 所述方法还包括： 判断所述静态 MAC地址安装消息是否包含与所 述 MAC地址关联的 P2P PW信息， 如果所述判断结果为否， 则所述方法还包 括：
根据发送所述静态 MAC地址安装消息的根运营边缘设备 Root PE地址或 者所述静态 MAC地址安装消息中携带的 Root PE地址，获取与所述 MAC地址关 联的 P2P PW信息；
则所述安装所述 MAC地址到静态转发表； 当从叶子客户接收到数据帧时， 根据所述静态转发表转发所述数据帧具体为： 安装所述 MAC地址和所述 P2P PW信息到所述静态转发表；当从叶子客户接收到单播帧时，通过所述 P2P PW 转发所述单播帧。
4、根据权利要求 1所述的转发方法， 其特征在于， 如果所述 MAC地址为特 殊值， 所述静态 MAC地址安装消息还包含与所述特殊 MAC地址关联的一条或 多条 P2P PW信息， 所述每条 P2P PW对应于一个 Root PE, 则安装所述 MAC 地址到静态转发表； 根据所述静态转发表转发所述数据帧具体为： 安装所述特 殊 MAC地址和所述 P2P PW信息到所述静态转发表得到特殊静态转发表项， 当 从叶子客户接收到组播帧、 广播帧或未知目的地址的单播帧时， 通过所述特殊 静态转发表项转发所述组播帧、 广播帧或未知目的地址的单播帧。
5、根据权利要求 1所述的转发方法， 其特征在于， 所述静态 MAC地址安 装消息是由 Root PE通过控制信令或网络管理平台通过管理平面命令发送。
6、 根据权利要求 1 所述的转发方法， 其特征在于， 如果所述 VPLS的组 播源是网桥设备， 多个终端用户或服务器通过所述网桥设备接入到 Root PE, 则所述 MAC地址为与所述多个终端用户或服务器对应的 MAC地址列表。
7、 一种虚拟专用局域网业务 VPLS的设备， 其特征在于， 包括： 接收单元， 用于接收静态 MAC地址安装消息， 所述静态 MAC地址安装消 息包含所述 VPLS的组播源端口所对应的媒体访问控制 MAC地址；
解析单元， 用于解析所述静态 MAC地址安装消息获取所述 MAC地址； 安装单元， 用于安装所述 MAC地址到静态转发表；
转发单元， 用于当从叶子客户接收到数据帧时， 根据所述静态转发表转发 所述数据帧。
8、 根据权利要求 7所述的设备， 其特征在于， 所述设备还包括： 判断单元， 用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地 址关联的点对点伪线 P2P PW信息， 如果所述判断结果为是， 则所述安装单元 具体用于安装所述 MAC地址和所述 P2P PW信息到所述静态转发表； 所述转发 单元具体用于当从叶子客户接收到单播帧时， 通过所述 P2P PW转发所述单播 帧。
9、 根据权利要求 7所述的设备， 其特征在于， 所述设备还包括： 判断单元， 用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地 址关联的 P2P PW信息，
获取单元， 用于当所述判断单元的判断结果为否时， 根据发送所述静态 MAC地址安装消息的根运营边缘设备 Root PE地址或者所述静态 MAC地址安 装消息中携带的 Root PE地址， 获取与所述 MAC地址关联的 P2P PW信息； 所述安装单元具体用于安装所述 MAC地址和所述 P2P PW信息到所述静 态转发表； 所述转发单元， 具体用于当从叶子客户接收到单播帧时， 通过所述 P2P PW转发所述单播帧。
10、 根据权利要求 7所述的设备， 其特征在于， 如果所述 MAC地址为特殊 值， 所述静态 MAC地址安装消息还包含与所述特殊 MAC地址关联的一条或多 条 P2P PW信息， 所述每条 P2P PW对应于一个 Root PE, 所述静态转发表得到特殊静态转发表项，
所述转发单元具体用于当从叶子客户接收到组播帧、 广播帧或未知目的地 址的单播帧时， 通过所述特殊静态转发表项转发所述组播帧、 广播帧或未知目 的地址的单播帧。
1 1、 一种虚拟专用局域网业务 VPLS的系统， 其特征在于， 包括： 根运营边缘设备 Root PE , 用于发送静态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所述 VPLS的组播源端口所对应的媒体访问控制 MAC 地址；
叶子运营边缘设备 Leaf PE, 用于接收、解析所述静态 MAC地址安装消息， 获取所述 MAC地址； 并用于安装所述 MAC地址到静态转发表； 当从叶子客户 接收到数据帧时， 根据所述静态转发表转发所述数据帧。
12、根据权利要求 1 1所述的系统，其特征在于，所述叶子运营边缘设备 Leaf PE还用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地址关联的点 对点伪线 P2P PW信息， 如果所述判断结果为是， 则： 安装所述 MAC地址和 所述 P2P PW信息到所述静态转发表； 当从叶子客户接收到单播帧时， 通过所 述 P2P PW转发所述单播帧。
13、根据权利要求 1 1所述的系统，其特征在于，所述叶子运营边缘设备 Leaf PE还用于判断所述静态 MAC地址安装消息是否包含与所述 MAC地址关联的 P2P PW信息， 如果所述判断结果为否， 则：
根据发送所述静态 MAC地址安装消息的根运营边缘设备 Root PE地址或 者所述静态 MAC地址安装消息中携带的 Root PE地址，获取与所述 MAC地址关 联的 P2P PW信息；
安装所述 MAC地址和所述 P2P PW信息到所述静态转发表； 当从叶子客 户接收到单播帧时， 通过所述 P2P PW转发所述单播帧。
14、 根据权利要求 1 1所述的系统， 其特征在于， 如果所述 MAC地址为特 殊值， 所述静态 MAC地址安装消息还包含与所述特殊 MAC地址关联的一条或 多条 P2P PW信息， 所述每条 P2P PW对应于一个 Root PE, 则所述叶子运营边 缘设备 Leaf PE具体用于：
安装所述特殊 MAC地址和所述 P2P PW信息到所述静态转发表得到特殊 静态转发表项，
当从叶子客户接收到组播帧、 广播帧或未知目的地址的单播帧时， 通过所 述特殊静态转发表项转发所述组播帧、 广播帧或未知目的地址的单播帧。
15、 一种虚拟专用局域网业务 VPLS的设备， 其特征在于， 用于发送静 态 MAC地址安装消息， 所述静态 MAC地址安装消息包含所述 VPLS的组播 源端口所对应的媒体访问控制 MAC地址。
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