WO2013123897A1 - 一种三层虚拟专用网私网数据转发的方法、装置和系统 - Google Patents

一种三层虚拟专用网私网数据转发的方法、装置和系统 Download PDF

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Publication number
WO2013123897A1
WO2013123897A1 PCT/CN2013/071788 CN2013071788W WO2013123897A1 WO 2013123897 A1 WO2013123897 A1 WO 2013123897A1 CN 2013071788 W CN2013071788 W CN 2013071788W WO 2013123897 A1 WO2013123897 A1 WO 2013123897A1
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private network
data
tunnel
public network
network data
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PCT/CN2013/071788
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English (en)
French (fr)
Inventor
李莹
刘波
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中兴通讯股份有限公司
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Priority to IN7798DEN2014 priority Critical patent/IN2014DN07798A/en
Publication of WO2013123897A1 publication Critical patent/WO2013123897A1/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
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling

Definitions

  • the present invention relates to the field of Layer 3 Virtual Private Network (L3VPN) technology, and in particular, to a L3VPN private network data forwarding method, device and system.
  • L3VPN Layer 3 Virtual Private Network
  • the PE carrier edge device
  • CE customer edge device
  • the forwarding of the L3VPN private network data in the public network depends on the public network label.
  • the PE searches for the specific path of the private network data transmitted on the public network according to the public network label of the private network data.
  • the path is the public network tunnel for private network data forwarding.
  • the selection of the public network tunnel is based on the calculation result of the public network route. Specifically, the next hop of the public network route is used as the route prefix, and the optimal matching is performed in the public network routing table, and the obtained public is matched.
  • a network routing tunnel is a public network tunnel that routes private networks. If the data of different private networks is forwarded to the same destination PE, the routing results obtained during the calculation of the public network route are the same. That is, the data of the private network is the same in the public network. That is: the data of different private networks correspond to the same public network tunnel, so the transmission path cannot be flexibly selected.
  • the forwarding path of the private network data on the public network is calculated by the public network route, and the public network route is constantly changing.
  • the forwarding path of the private network data in the public network is uncontrollable.
  • the bandwidth and services provided by the forwarding path of specific private network data are also not guaranteed.
  • the main purpose of the present invention is to provide a method, device, and system for forwarding data of a private network of an L3VPN, which can control different private network data to be transmitted through a set path in a public network.
  • the invention provides a method for forwarding data of an L3VPN private network, the method comprising: setting a public network tunnel between PEs, and setting a correspondence between the private network data to be transmitted and the set public network tunnel; private network data is transmitted from the CE to the After the local PE, the local PE searches for the outer public network label of the private network data according to the mapping between the private network data and the public network tunnel. After the inner and outer layers of the private network are encapsulated, the local PE sends the private network tunnel to the peer PE. .
  • the corresponding relationship between the private network data and the public network tunnel is stored in the private network routing table.
  • the method further includes: after receiving the private network data, the peer PE performs decapsulation, searches the label forwarding table according to the inner private network label, and sends the private network data to the destination CE.
  • the present invention also provides an apparatus for forwarding data of an L3VPN private network, the apparatus comprising: a setting module, a searching module, and a sending module;
  • the setting module is configured to set a public network tunnel between the PEs, and set a correspondence between the private network data to be transmitted and the set public network tunnel;
  • the searching module is configured to: after the private network data is transmitted from the customer edge device CE to the local PE, the outer public network label of the private network data is searched according to the correspondence between the private network data and the public network tunnel that the setting module has set;
  • the sending module is configured to send the private network data to the peer PE through the set public network tunnel.
  • the device further includes a receiving module, configured to perform decapsulation after receiving the private network data, and find the label forwarding table according to the inner private network label, and send the private network data to the destination CE.
  • a receiving module configured to perform decapsulation after receiving the private network data, and find the label forwarding table according to the inner private network label, and send the private network data to the destination CE.
  • the present invention also provides a system for data forwarding of an L3VPN private network, the system comprising: a local PE and a peer PE; a public network tunnel is set between the local PE and the peer PE, and the private network is to be transmitted. The correspondence between the data and the set public network tunnel is set;
  • the local PE after receiving the private network data from the CE, searches for the outer public network label of the private network data according to the corresponding relationship between the private network data and the public network tunnel, and performs internal and external encapsulation on the private network data. It is sent to the peer PE through the established public network tunnel.
  • the peer PE is further configured to perform decapsulation after receiving the private network data, and find the label forwarding table according to the inner private network label, and send the private network data to the destination CE.
  • the method, device, and system for forwarding data of the L3VPN private network are provided, and a public network tunnel is set between the PEs, and the correspondence between the private network data to be transmitted and the set public network tunnel is set; the private network data is transmitted from the CE to the local PE. Then, the local PE searches for the outer public network label of the private network data according to the mapping between the private network data and the public network tunnel. After the outer network is encapsulated, the local network is sent to the peer PE through the public network tunnel.
  • the invention can flexibly set different public network tunnels for different private network data for transmission, and can effectively allocate network resources of the public network.
  • the public network tunnel has nothing to do with the public network route, which solves the problem that the forwarding path of the private network data in the prior art is uncontrollable, and facilitates the service and supervision of different private network traffic through the tunnel in the public network.
  • FIG. 1 is a schematic diagram of a network topology structure of private network data transmission in an existing L3VPN;
  • FIG. 2 is a schematic flowchart of a method for implementing data forwarding of a L3VPN private network according to the present invention
  • FIG. 3 is a schematic structural diagram of a network topology according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of an apparatus for data forwarding of an L3VPN private network according to the present invention. detailed description
  • the basic idea of the present invention is: setting a public network tunnel between the PEs, and setting a correspondence between the private network data to be transmitted and the set public network tunnel; after the private network data is transmitted from the CE to the local PE, the local PE is based on the private network data.
  • the network data is encapsulated in the inner and outer layers and sent to the peer PE through the established public network tunnel.
  • the peer PE decapsulates the packet, searches the label forwarding table according to the inner private network label, and sends the private network data to the destination CE.
  • FIG. 2 is a schematic flowchart of a method for implementing data forwarding on an L3VPN private network according to the present invention. As shown in FIG. 2, the implementation steps of the process are as follows:
  • Step 201 Set a public network tunnel between the PEs, and set a correspondence between the private network data to be transmitted and the set public network tunnel.
  • a plurality of public network tunnels are set up between the PEs, such as tunnel 1, tunnel 2, tunnel N.
  • different private network data can be the same as the public network tunnel.
  • it can also correspond to different public network tunnels.
  • the setting method of the public network tunnel is the prior art and will not be described in detail here.
  • the mapping between the private network data to be transmitted and the tunnel number is set for the private network data to be transmitted. For example, the data of the private network A corresponds to the tunnel 1 and the data of the private network B corresponds to the tunnel 2. Wait.
  • the corresponding relationship between the set private network data and the public network tunnel is stored in the private network routing table, and the public network exit of the private network route is the specific public network tunnel that has been set.
  • Step 202 After the private network data is transmitted from the CE to the local PE, the local PE searches for the outer public network label of the private network data according to the correspondence between the private network data and the public network tunnel.
  • the local PE searches the private network routing table of the private network data, and searches for the public network label corresponding to the private network data according to the public network tunnel number.
  • Step 203 After the local PE encapsulates the private network data, it sends the data to the peer PE through the established public network tunnel.
  • the local PE adds the inner private network label to the private network data, and the private network label is the same as the private network label encapsulated in the private network data transmission, and then the outer public network label is added, and the outer public network is added.
  • the label is the outgoing label of the corresponding transmission tunnel. Therefore, the private network data passes the corresponding The public network tunnel is transmitted on the public network, so that different private network data can be transmitted through different public network tunnels.
  • the method further includes: after receiving the private network data, the peer PE performs decapsulation of the outer layer and the inner layer, and then searches for the label forwarding table according to the inner private network label, and sends the private network data to the destination. CE. This process is prior art and will not be described in detail.
  • CE1 and CE2 belong to the private network A
  • CE3 and CE4 belong to the private network B
  • CE1 accesses CE2
  • CE3 accesses CE4.
  • PE2 the implementation method flow is as follows:
  • Step 1 Set two public network tunnels between PE 1 and PE 2, namely tunnel 1 and tunnel respectively.
  • Step 2 On the private network A instance of PE1, set the public network tunnel to PE2 as tunnel 1. In the private network B instance of PE1, set the public network tunnel to PE2 as tunnel 2.
  • the public network exit of the private network route is the set tunnel 1; in the private network routing table of private network B, the public network exit of the private network route is set. Tunnel 2.
  • Step 3 The data of the private network A is sent to the PE1 through the CE1.
  • the PE1 searches the private network routing table of the private network A to obtain the inner private network label, and searches for the public network label corresponding to the data of the private network A according to the public network tunnel number.
  • the data of the private network A is sent to the PE2 through the tunnel 1.
  • the outer public network label of the data of the private network A is the outgoing label of the tunnel 1, and the data of the private network A is transmitted through the tunnel 1 on the public network;
  • the data of the private network B is sent to the PE1 through the CE3.
  • the PE1 searches the private network routing table of the private network B to obtain the inner private network label, and searches for the public network label corresponding to the data of the private network B according to the public network tunnel number.
  • the data of the private network B is sent to the PE2 through the tunnel 2. Because private has been set The data of the network B is transmitted through the tunnel 2. Therefore, the outer public network label of the data of the private network B is the outgoing label of the tunnel 2, and the data of the private network B is transmitted through the tunnel 2 on the public network.
  • Step 4 After the data of the private network A or the private network B reaches the PE2, the label of the tunnel 1/tunnel 2 is thrown.
  • the label forwarding table is searched according to the inner private network label, and the private network A/private network B is obtained according to the label forwarding table.
  • the data is forwarded to CE2/CE4, and the data transmission process of the private network A/private network B ends.
  • FIG. 4 is a schematic structural diagram of an apparatus for forwarding data on a private network of an L3VPN according to the present invention. As shown in FIG. 4, the method includes: a setting module, a searching module, and a sending module, which are disposed on a PE;
  • the setting module is configured to set a public network tunnel between the PEs, and set a correspondence between the private network data to be transmitted and the set public network tunnel;
  • the searching module is configured to: after the private network data is transmitted from the CE to the local PE, the outer public network label of the private network data is searched according to the corresponding relationship between the private network data and the public network tunnel that is set by the setting module; The private network data is encapsulated in the inner and outer layers and sent to the peer PE through the established public network tunnel.
  • the device further includes a receiving module disposed on the PE, configured to perform decapsulation after receiving the private network data, and find the label forwarding table according to the inner private network label, and send the private network data to the destination CE.
  • a receiving module disposed on the PE, configured to perform decapsulation after receiving the private network data, and find the label forwarding table according to the inner private network label, and send the private network data to the destination CE.
  • the present invention also provides a system for data forwarding of an L3VPN private network, including: a local PE and a peer PE; a public network tunnel is set between the local PE and the peer PE, and the private network data to be transmitted and the public set are set. The corresponding relationship of the network tunnel has been set;
  • the local PE after receiving the private network data from the CE, searches for the outer public network label of the private network data according to the correspondence between the private network data and the public network tunnel, and encapsulates the private network data. Then, it is sent to the peer PE through the established public network tunnel.
  • the peer PE is further configured to perform decapsulation after receiving the private network data, and find the label forwarding table according to the inner private network label, and send the private network data to the destination CE.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

本发明公开了一种三层虚拟专用网（L3VPN）私网数据转发的方法，包括：在运营商边缘设备（PE）间设置公网隧道，并设置待传输私网数据与所设置公网隧道的对应关系；私网数据从客户边缘设备（CE）传输到本地PE后，本地PE根据私网数据与公网隧道的对应关系查找私网数据的外层公网标签，对私网数据进行内外层封装后，通过已设置的公网隧道发送给对端PE。本发明还同时公开了一种实现上述方法的装置和系统，运用该方法、装置和系统可控制不同的私网数据在公网中通过设定的路径传输。

Description

一种三层虚拟专用网私网数据转发的方法、 装置和系统 技术领域
本发明涉及三层虚拟专用网 （ Layer 3 Virtual Private Network, L3VPN ) 技术领域， 尤其涉及一种 L3VPN私网数据转发的方法、 装置和系统。 背景技术
在现有 L3VPN 中， 如图 1 所示， 私网数据经由各客户边缘设备 ( Customer Edge, CE )到达运营商边缘设备（ Provider Edge, PE )后， 经 PE为所述私网数据封装内层私网标签和外层公网标签后， 根据外层公网标 签在公网中转发， 到达对端 PE后， PE根据私网标签， 将私网数据转发给 与私网标签对应的 CE , 如此即完成了私网数据的传输。
目前， 所述 L3VPN私网数据在公网中的转发， 依赖于所述公网标签。
PE根据私网数据的公网标签查找私网数据在公网中传输的具体的路径， 该 路径即为私网数据转发的公网隧道。 所述公网隧道的选择以公网路由计算 的结果为依据， 具体的， 以私网路由的公网下一跳做路由前缀， 并在公网 路由表中进行最优匹配， 匹配所得的公网路由隧道即为私网路由的公网隧 道。 如果不同私网的数据从同一 PE出发去向相同的目的 PE, 那么， 在进 行公网路由计算时所得的路由结果相同， 也就是说， 属于不同私网的数据 在公网中的传输路径相同， 即： 不同私网的数据对应相同的公网隧道， 所 以传输路径不可灵活选择。
此外， 因私网数据在公网中的转发路径是由公网路由计算所得的， 且 公网路由在不断变化， 从而导致私网数据在公网中的转发路径变化不可控， 相应的， 针对特定私网数据的转发路径所提供的带宽和服务也都无法保证。 发明内容
有鉴于此，本发明的主要目的在于提供一种 L3VPN私网数据转发的方 法、 装置和系统， 可控制不同的私网数据在公网中通过设定的路径传输。
为达到上述目的， 本发明的技术方案是这样实现的：
本发明提供了一种 L3VPN私网数据转发的方法， 该方法包括： 在 PE间设置公网隧道，并设置待传输私网数据与所设置公网隧道的对 应关系； 私网数据从 CE传输到本地 PE后， 本地 PE根据私网数据与公网 隧道的对应关系查找私网数据的外层公网标签， 对私网数据进行内外层封 装后， 通过已设置的公网隧道发送给对端 PE。
其中， 所述私网数据与公网隧道的对应关系存储于私网路由表中。 该方法还包括： 对端 PE收到私网数据后进行解封装， 根据内层私网标 签， 查找标签转发表， 将私网数据发送到目的 CE。
本发明还提供了一种 L3VPN私网数据转发的装置， 该装置包括： 设置 模块、 查找模块和发送模块； 其中，
所述设置模块， 用于在 PE间设置公网隧道， 并设置待传输私网数据与 所设置公网隧道的对应关系；
所述查找模块， 用于私网数据从客户边缘设备 CE传输到本地 PE后， 根据设置模块已设置的私网数据与公网隧道的对应关系， 查找私网数据的 外层公网标签；
所述发送模块， 用于对私网数据进行内外层封装后， 通过已设置的公 网隧道发送给对端 PE。
该装置还包括接收模块， 用于收到私网数据后进行解封装， 根据内层 私网标签， 查找标签转发表， 将私网数据发送到目的 CE。
本发明还提供了一种 L3VPN私网数据转发的系统， 该系统包括： 本地 PE和对端 PE; 所述本地 PE和对端 PE间已设置公网隧道， 且待传输私网 数据与所设置的公网隧道的对应关系已设置；
所述本地 PE, 用于收到从 CE传来的私网数据后， 根据私网数据与公 网隧道的对应关系查找私网数据的外层公网标签， 对私网数据进行内外层 封装后， 通过已设置的公网隧道发送给对端 PE。
所述对端 PE,还用于收到私网数据后进行解封装，根据内层私网标签， 查找标签转发表， 将私网数据发送到目的 CE。
本发明提供的 L3VPN私网数据转发的方法、 装置和系统， 在 PE间设 置公网隧道， 并设置待传输私网数据与所设置公网隧道的对应关系； 私网 数据从 CE传输到本地 PE后， 本地 PE根据私网数据与公网隧道的对应关 系查找私网数据的外层公网标签， 对私网数据进行内外层封装后， 通过已 设置的公网隧道发送给对端 PE。 本发明可为不同的私网数据灵活设置不同 的公网隧道进行传输， 可有效分配公网的网络资源。
此外， 公网隧道与公网路由无关， 解决了现有技术中私网数据的转发 路径不可控的问题， 并利于在公网通过隧道来对不同私网流量提供服务和 监管。 附图说明
图 1为现有 L3VPN中私网数据传输的网络拓朴结构示意图；
图 2为本发明 L3VPN私网数据转发的方法实现流程示意图；
图 3为本发明一实施例的网络拓朴结构示意图；
图 4为本发明 L3VPN私网数据转发的装置结构示意图。 具体实施方式
本发明的基本思想是： 在 PE间设置公网隧道， 并设置待传输私网数据 与所设置公网隧道的对应关系；私网数据从 CE传输到本地 PE后，本地 PE 根据私网数据与公网隧道的对应关系查找私网数据的外层公网标签， 对私 网数据进行内外层封装后， 通过已设置的公网隧道发送给对端 PE。
进一步地， 对端 PE收到私网数据后进行解封装， 根据内层私网标签， 查找标签转发表， 将私网数据发送到目的 CE。
下面结合附图及具体实施例对本发明作进一步详细说明。
图 2为本发明 L3VPN私网数据转发的方法实现流程示意图，如图 2所 示， 该流程的实现步骤如下：
步骤 201 : 在 PE间设置公网隧道， 并设置待传输私网数据与所设置的 公网隧道的对应关系；
具体为： 在 PE间设置多条公网隧道， 如隧道 1、 隧道 2 隧道 N, 在设置待传输私网数据与公网隧道的对应关系时， 不同的私网数据可与同 一条公网隧道对应， 也可对应不同的公网隧道。 关于公网隧道的设置方法 为现有技术， 此处不再详述。 为待传输私网数据设置与公网隧道的对应关 系， 可设置待传输私网数据与隧道号的对应关系， 如： 私网 A的数据与隧 道 1对应， 私网 B的数据与隧道 2对应等。
这里， 所设置的私网数据与公网隧道的对应关系保存于私网路由表中， 私网路由的公网出口即为已设置的特定公网隧道。
步骤 202: 私网数据从 CE传输到本地 PE后，本地 PE根据私网数据与 公网隧道的对应关系查找私网数据的外层公网标签；
具体为： 私网数据经由 CE传输到本地 PE后， 本地 PE查找私网数据 的私网路由表， 根据公网隧道号查找与私网数据对应的公网标签。
步骤 203: 本地 PE对私网数据进行内外层封装后， 通过已设置的公网 隧道发送给对端 PE;
具体为： 本地 PE为私网数据添加内层私网标签， 所述私网标签与现有 私网数据传输时封装的私网标签相同， 之后添加外层公网标签， 所述外层 公网标签即为对应传输隧道的出标签。 因此， 所述私网数据则通过相应的 公网隧道在公网上传输 , 从而可实现不同私网数据通过不同的公网隧道传 输。
本步骤之后， 该方法还包括： 对端 PE收到私网数据后， 先后进行外层 和内层的解封装后， 根据内层私网标签， 查找标签转发表， 将私网数据发 送到目的 CE。 该过程为已有技术， 不再详述。
下面结合一实施例对本发明进行详细描述。
图 3为本发明一实施例的网络拓朴结构示意图， 如图 3所示， CE1和 CE2同属于私网 A, CE3和 CE4同属于私网 B, CE1访问 CE2、 CE3访问 CE4均需要经过 PE1和 PE2 , 实现方法流程如下：
步骤一： 在 PE 1和 PE2之间设置两条公网隧道， 分别为隧道 1和隧道
2;
步骤二： 在 PE1的私网 A实例下，设置到达 PE2的公网隧道为隧道 1 , 在 PE1的私网 B实例下， 设置到达 PE2的公网隧道为隧道 2;
这样， PE1上私网 A的私网路由表中， 私网路由的公网出口则为已设 置的隧道 1 ; 私网 B的私网路由表中， 私网路由的公网出口则为已设置的 隧道 2。
步骤三： 私网 A的数据经由 CE1发送到 PE1 , PE1查找私网 A的私网 路由表获取内层私网标签， 并根据公网隧道号查找与私网 A的数据对应的 公网标签， 进行内外层封装后， 通过隧道 1将私网 A的数据发送到 PE2。 这里， 因已设置私网 A的数据通过隧道 1传输， 所以私网 A的数据的外层 公网标签是隧道 1的出标签， 该私网 A的数据在公网上通过隧道 1进行传 输；
私网 B的数据经由 CE3发送到 PE1 , PE1查找私网 B的私网路由表获 取内层私网标签，并根据公网隧道号查找与私网 B的数据对应的公网标签， 进行内外层封装后， 通过隧道 2将私网 B的数据发送到 PE2。 因已设置私 网 B的数据通过隧道 2传输， 所以私网 B的数据的外层公网标签是隧道 2 的出标签， 该私网 B的数据在公网上通过隧道 2进行传输。
步骤四： 私网 A/私网 B的数据到达 PE2后， 将隧道 1/隧道 2的标签抛 出， 根据内层私网标签查找标签转发表， 根据标签转发表将私网 A/私网 B 的数据转发到 CE2/ CE4, —轮私网 A/私网 B的数据传输过程结束。
图 4为本发明 L3VPN私网数据转发的装置结构示意图， 如图 4所示， 包括： 设置于 PE上的设置模块、 查找模块和发送模块； 其中，
所述设置模块， 用于在 PE间设置公网隧道， 并设置待传输私网数据与 所设置的公网隧道的对应关系；
所述查找模块， 用于私网数据从 CE传输到本地 PE后， 根据设置模块 已设置的私网数据与公网隧道的对应关系， 查找私网数据的外层公网标签； 所述发送模块， 用于对私网数据进行内外层封装后， 通过已设置的公 网隧道发送给对端 PE。
该装置还包括设置于 PE上的接收模块，用于收到私网数据后进行解封 装， 根据内层私网标签， 查找标签转发表， 将私网数据发送到目的 CE。
本发明还提供了一种 L3VPN私网数据转发的系统， 包括： 本地 PE和 对端 PE; 所述本地 PE和对端 PE间已设置公网隧道， 且待传输私网数据与 所设置的公网隧道的对应关系已设置；
所述本地 PE, 用于收到从 CE传来的私网数据后， 根据私网数据与公 网隧道的对应关系查找私网数据的外层公网标签， 并对私网数据进行内外 层封装后， 通过已设置的公网隧道发送给对端 PE。
进一步地， 所述对端 PE, 还用于收到私网数据后进行解封装， 根据内 层私网标签， 查找标签转发表， 将私网数据发送到目的 CE。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种三层虚拟专用网 L3VPN私网数据转发的方法， 其特征在于， 该方法包括：
在运营商边缘设备 PE间设置公网隧道，并设置待传输私网数据与所设 置的公网隧道的对应关系；
私网数据从客户边缘设备 CE传输到本地 PE后， 本地 PE根据私网数 据与公网隧道的对应关系， 查找私网数据的外层公网标签， 并对私网数据 进行内外层封装后， 通过已设置的公网隧道发送给对端 PE。
2、 根据权利要求 1所述的 L3VPN私网数据转发的方法， 其特征在于， 所述私网数据与公网隧道的对应关系存储于私网路由表中。
3、 根据权利要求 1或 2所述的 L3VPN私网数据转发的方法， 其特征 在于， 该方法还包括：
对端 PE收到私网数据后进行解封装， 根据内层私网标签， 查找标签转 发表， 并将私网数据发送到目的 CE。
4、 一种 L3 VPN私网数据转发的装置， 其特征在于， 该装置包括： 设 置模块、 查找模块和发送模块； 其中，
所述设置模块， 用于在 PE间设置公网隧道， 并设置待传输私网数据与 所设置公网隧道的对应关系；
所述查找模块， 用于私网数据从客户边缘设备 CE传输到本地 PE后， 根据设置模块已设置的私网数据与公网隧道的对应关系， 查找私网数据的 外层公网标签；
所述发送模块， 用于对私网数据进行内外层封装后， 通过已设置的公 网隧道发送给对端 PE。
5、 根据权利要求 4所述的 L3VPN私网数据转发的装置， 其特征在于， 该装置还包括接收模块， 用于收到私网数据后进行解封装， 根据内层私网 标签， 查找标签转发表， 并将私网数据发送到目的 CE。
6、 一种 L3 VPN私网数据转发的系统， 其特征在于， 该系统包括： 本 地 PE和对端 PE; 所述本地 PE和对端 PE间已设置公网隧道， 且待传输私 网数据与所设置的公网隧道的对应关系已设置；
所述本地 PE, 用于收到从 CE传来的私网数据后， 根据私网数据与公 网隧道的对应关系查找私网数据的外层公网标签， 并对私网数据进行内外 层封装后， 通过已设置的公网隧道发送给对端 PE。
7、 根据权利要求 6所述的 L3VPN私网数据转发的系统， 其特征在于， 所述对端 PE, 还用于收到私网数据后进行解封装， 根据内层私网标签， 查 找标签转发表， 将私网数据发送到目的 CE。
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