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

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 ...

AI Technical Summary

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 detect the link failure between PE101 and CE103 in time

The disadvantage of VPN FRR technology is that VPN FRR technology only works when the PE equipment fails, and its application is limited when the link on the access side fails.

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