Data transmission method and data transmission device for special two-layer virtual network

Abstract

The embodiment of the invention provides a data transmission method and a data transmission device for a special two-layer virtual network. The data transmission method is applied to a network comprising a main virtual link and a standby virtual link which are born by traffic engineering, wherein the main virtual link passes an upstream node and a downstream node. The data transmission method comprises the following steps of: detecting a connection state of a communication link to be protected between the upstream node and the downstream node and determining whether the communication link to be protected has faults or not by the upstream node; if the communication link to be protected has faults, carrying out fast rerouting switch on the traffic engineering and transmitting and switching data to a pre-established standby label exchange channel for protecting the communication link to be protected by the upstream node; and triggering the virtual link to switch by the upstream node. According to the embodiment of the invention, when the link has faults, a fast rerouting is locally protected through the traffic engineering and then the virtual link is smoothly switched, so that the speed of fault detection and flow switch is improved and the service interruption time when the link has the faults is shortened.

Description

technical field [0001] The embodiments of the present invention relate to communication technologies, and in particular to a data transmission method and device for a Layer 2 virtual private network. Background technique [0002] With the widespread application of Layer 2 Virtual Private Network (Layer 2 Virtual Private Network, hereinafter referred to as: L2VPN), the reliability requirements for L2VPN, especially for L2VPN networks carrying real-time services such as VoIP and IPTV, are getting higher and higher. A virtual link (Pseudo Wire, hereinafter referred to as: PW) redundancy (Redundancy) is one of technologies for improving reliability of an L2VPN network. In the PW redundancy technology, a failure of the L2VPN network may be detected through a bidirectional forwarding detection (Bidirectional Forwarding Detection, hereinafter referred to as: BFD) mechanism, and then a failure notification and fast traffic switching may be performed. [0003] figure 1 It is a sche...

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Problems solved by technology

[0004] However, PW redundancy is an end-to-end protection technology. When the network topology is complex, in order to avoid BFD flapping, the BFD detection interval needs to be configured with a large value. As a result, the speed of BFD fault detection and traffic switching is low, and link failures occur. business interruption time

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