Method and system for transmitting message in virtual special network link fault

Abstract

A packet transmission method and system when link fails in virtual private network (VPN), install the same dummy PE on at least two operators edge equipment (PE) that dominate the same user edge equipment (CE) and set up the dummy VPN routing transmitted example (VRF) of CE based on the dummy PE, in the at least two PE determine a major PE and multi-spare PE, the major PE send to spare PE after distribute two layers of label for the dummy VRF installed CE itself, the two layers of label the spare PE received links to the dummy VRF installed CE, the method also comprises : when the message CE need to convey pass through the major PE, it is packaged by the major PE to the two layers of label the major PE distribute, when the dummy VRF labeled message transmitting routing link set by the major PE fails to connect, the message convert to dummy VRF labeled message packaging two label layers message routing link set by one of the spare PE and sent by it.

Description

technical field [0001] The invention relates to a method for transmitting messages in a virtual private network (VPN), in particular to a method and system for transmitting messages when a VPN link fails. Background technique [0002] VPN is a technology that allows private network traffic to run on the public network. The user edge equipment (CE) in the VPN adopts a private address, and the private address is not allowed to be released to the public network. Isolation means that CEs belonging to different VPNs cannot communicate with each other. Multi-Protocol Label Switching (MPLS) VPN is an Internet Protocol-Virtual Private Network (IP-VPN) based on MPLS technology, which propagates VPN routing information through the extended Border Gateway Protocol (MP-BGP), and uses MPLS as a forwarding channel to transmit message. [0003] MPLS VPN based on MP-BGP needs to establish two label switching paths (LSP) between the ingress provider edge equipment (PE) of the message and t...

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Problems solved by technology

[0012] At present, there are disadvantages to the second method: First, when the VPN FRR technology is used to transmit packets, the PE at the packet receiving end detects that the PE at the packet sending end fails or a fault occurs between the PE at the packet sending end and the CE. Link switching takes a long time, generally more than 50ms; secondly, when using VPN FRR technology to transmit packets, it is necessary to switch the active and secondary PEs, and it is necessary to modify the inner label of the packet and the assigned LSP The outer label is more cumbersome

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