Failure monitoring method and device for virtual rented line

Abstract

A failure monitoring method for a virtual leased line is provided, and the method includes: receiving a message sent by a local user end to an opposite user end from the virtual leased line; judging whether the received message is a link protocol message; and when the message is a link protocol message, judging whether the link protocol message is a failure message. In addition, a failure monitoring device for a virtual leased line is provided, and the device can monitor the failure occurring in any position of the link when the same media are interconnected, and can fast reroute the virtual leased line service according to the monitored failure.

Description

technical field [0001] The invention relates to the field of information technology, in particular to a fault monitoring method and device for a virtual leased line. Background technique [0002] Virtual Leased Line (VLL, Virtual Leased Line) is a network interconnection service. VLL service is a point-to-point connection. If any point in the network fails, the VLL service will be interrupted, thereby reducing the reliability of the VLL service. sex. [0003] In order to improve the reliability of the VLL service, the prior art proposes a VLL-based fast rerouting (FRR, Fast Reroute) method, combined below figure 1 Describe this prior art, such as figure 1 As shown, the network diagram includes the user end (CE, Customer Edge) and the supply end (PE, Provider Edge), specifically implemented as follows: [0004] A primary pseudo-link (PW, Pseudo wire) is established between the counterparty provider and the local provider, and a backup PW is established between the counterp...

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Problems solved by technology

[0006] But, above-mentioned prior art is when AC is Point-to-Point Protocol (PPP, Point-to-Point Protocol), Frame Relay (FR, Frame Relay) and advanced data link control (HDLC, High Level Data LinkControl) link It is divided into two cases: one case is the interconnection of heterogeneous media (for example, the link state is independently negotiated between the other party’s user end and the other party’s supply end, the local supply end and the local user end, and the local backup supply end and the local user end. ), at this time, the AC can use the mechanism of the link protocol itself to detect faults; another case is the interconnection of the same medium. The path negotiation packets are transparently transmitted on the other party's supply end. Therefore, when the same medium is interconnected, the other party's supply end cannot detect the failure of the AC link. Furthermore, the other party's supply end cannot switch from the primary PW to the backup PW, the VLL service cannot be protected

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