Method and equipment for real-time recovery of virtual private network (VPN) message forwarding in L3VPN

A packet forwarding and packet technology, which is applied in the field of network communication, can solve the problems of inability to sense link failures and restrictions in time, and achieve the effect of reducing the probability of VPN packet loss.

Active Publication Date: 2011-02-16
HUAWEI TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

Although the normal forwarding of VPN packets can be guaranteed, this method has the following disadvantages: in this method, the VPN route and the VRRP active/standby state are independent of each other, so that PE104 cannot de

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  • Method and equipment for real-time recovery of virtual private network (VPN) message forwarding in L3VPN
  • Method and equipment for real-time recovery of virtual private network (VPN) message forwarding in L3VPN
  • Method and equipment for real-time recovery of virtual private network (VPN) message forwarding in L3VPN

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] figure 1 It is a schematic diagram of a system applied to the method for real-time restoration of VPN message forwarding in the L3VPN provided by the embodiment of the present invention. CE103 is dual-homed to PE101 and PE102, and CE105, which belongs to the same VPN as CE103, is connected to remote carrier edge device PE104. VPN packets between CE103 and CE105 are forwarded through PE101, PE102, and remote PE104. In this embodiment, the flow direction of the VPN packets sent from CE105 to CE103 is called the downlink direction, and the flow direction of the VPN packets sent from CE103 to CE105 is called the uplink direction. The VPN packet sent from CE105 to CE103 is first sent to PE104, and PE104 chooses whether to use PE101 or PE102 to forward the received downlink VPN packet sent by CE105 to CE103 mainly based on the VPN routing table entry on PE104. For...

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Abstract

The embodiment of the invention provides a method for the real-time recovery of VPN message forwarding in three-layer virtual private network (L3VPN), which comprises the following steps: the VPN routing information of the respective equipment is mutually announced between first operator edge equipment PE and second PE through a cross-frame communication protocol; the first PE is selected by far-end PE to be used for forwarding the VPN message of user edge equipment CE; the CE is accessed to the first PE and the second PE in a double return mode; the first PE forwards the VPN message received from the far-end PE to the second PE according to the VPN routing information on the second PE announced by the second PE when a link between the first PE and the CE malfunctions; and the second PE transmits the VPN message to the CE. When the access side breaks down, the normal forwarding of the VPN message can be realized in the L3VPN network so as to reduce the loss probability of the VPN when malfunctions appear by adopting the technical scheme provided by the embodiment of the invention.

Description

technical field [0001] The present invention relates to the field of network communication technology, and in particular to a method and device for real-time restoration of VPN (Virtual Private Network, virtual private network) message forwarding in L3VPN. Background technique [0002] L3VPN (Layer 3 Virtual Private Network) is a layer 3 VPN technology based on MPLS (Multi-Protocol Label Switching). It uses BGP (Border Gateway Protocol, Border Gateway Protocol) to advertise VPN routes on the service provider backbone network, and uses MPLS to forward VPN packets on the service provider backbone network. Each site sends its own VPN routes to the backbone network, and these routes are added with private network information and VPN-related member information in the backbone network, and the routing information is published and exchanged through BGP. [0003] Currently, in the L3VPN network, a VRRP (Virtual Router Redundancy Protocol, Virtual Router Redundancy Protocol) method ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/24H04L12/46H04L45/28
Inventor 薛莉陈国义何路友
Owner HUAWEI TECH CO LTD
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