Service link tracking realization method and device

Abstract

The invention provides a service link tracking realization method and a service link tracking realization device, which are applied to a multi-protocol label switching-transport profile (MPLS-TP) network. The method comprises the following steps of: detecting the amount N of transmitting node equipment between a first maintenance end point and a second maintenance end point when a message is transmitted from the first maintenance end point to the second maintenance end point; transmitting a first loopback request message to the second maintenance end point, wherein the set time to live of the first loopback request message corresponds to time required by the transmission of the first loopback request message to the Mth node equipment, and M is less than or equal to N; and receiving a first loopback response message in response to the first loopback request message from the Mth node equipment, and reporting link information between the first maintenance end point and the Mth node equipment. By the method and the device, actual service traffic conditions between a source-end maintenance end point (MEP) and a destination-end MEP can be completely acquired, and the function of performing link tracking on a point-to-point co-routing bidirectional path in the MPLS-TP network is realized.

Description

technical field [0001] The present invention relates to MPLS-TP (Multi-Protocol Label Switching Transmission Application) network transmission technology, in particular to a method for realizing point-to-point co-routing bidirectional path OAM (operation, management, maintenance) in MPLS-TP network, and performing service link tracking and device. Background technique [0002] MPLS-TP supports a point-to-point co-routing bidirectional path, which follows the same route (link and node) forward and backward. In the MPLS-TP network, the LSP (Label Switched Path label switching path) and PW (virtual link) on the application of the path. [0003] MPLS-TP is a connection-oriented packet switching network technology. In April 2008, it was proposed by the Joint Working Group (JWT) established by ITU-T (International Telecommunication Union Standardization Organization for Telecommunications) and IETF (Internet Engineering Task Force). MPLS-TP = MPLS-L3 complexity + OAM + protectio...

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Problems solved by technology

[0004] The draft draft-bhh-mpls-tpoam-y1731-04 describes the relevant technical details and implementation of MPLS-TP OAM in detail, but there is no definition and implementation method for link tracking. So far, there are only functional requirements analysis and approximate Technical solutions, such as the requirement of path tracing in the requirements document IETFrfc5860 of MPLS-TP OAM, but there is no specific implementation method; in MPLS Architectural Considerations for a Transport Profile [Dave Ward, Malcolm Betts, ed.ITU-T-IETF Joint Working Team, April 18, 2008] proposed to use TTL (time to live) expiration to realize the communication from the maintenance end point MEP (Maintenance End Point) to the maintenance intermediate point MIP (Maintenance Intermediate Point), but for the chain For road tracing, the specific implementation method is not mature. First, it can only realize the communication from MEP to the designated MIP; second, there is no definition for sending OAM messages; finally, there is no explanation for how to reply

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