Detection method, device and system of traffic engineering tunnel

Abstract

The embodiment of the invention discloses a detection method, device and system of a traffic engineering tunnel. The detection method of the traffic engineering tunnel comprises the steps that (1) a middle node receives an MPLS request message sent by a head node; (2) information of a reverse path from the middle node to the head node is obtained, wherein the information of the reverse path comprises address information of nodes on the reverse path from the middle node to the head node, and the address information of the nodes is obtained from the MPLS request message or address information stored on a local path storage area when the traffic engineering tunnel is built; (3) an MPLS response message corresponding to the MPLS request message is sent to the head node according to the information of the reverse path. When the detection method, device and system of the traffic engineering tunnel are adopted, due to the fact that the middle node can send the MPLS response message to the head node according to the information of the reverse path, the coupling relation between the middle node and a router is terminated, the phenomenon that TE ping and TE tracert are out of operation due to the fact that the router is obstructed is avoided, and the success rate of communication detection and diagnosis on the traffic engineering tunnel is improved.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method, device and system for detecting traffic engineering tunnels. Background technique [0002] TE (Traffic Engineering, traffic engineering) can achieve link traffic balance, solve the congestion caused by unreasonable allocation of network resources, improve resource utilization, and reduce operating costs. MPLS (Multi-Protocol Label Switching, Multi-Protocol Label Switching) TE is used to solve the congestion problem in the MPLS network. The TE tunnel established in the MPLS network is an MPLS TE tunnel (MPLS TE tunnel). The data transmission in the MPLS TE tunnel occurs in On the label switched path (LSP, lable switched path), the LSP is the label sequence of each node along the path from the source end to the terminal. The MPLS TE tunnel is initiated by the head end of the tunnel and is a head-end LSP tunnel and MPLS TE tunnel are unidirectional tunnels. ...

AI Technical Summary

Problems solved by technology

[0004] In the process of detecting and diagnosing MPLS TE connectivity, TE ping and TE tracert will fail if the route is unreachable. For example, when an MPLS TE tunnel is established across routing domains, the routes are isolated from each other so that the end node has no route to the head node. The response message cannot find the route to the first node, causing TE ping and TE tracert to fail; if the MPLS TE tunnel uses the ISIS (intermediate system to intermediate system) protocol to distribute path information, within the time after the node starts successfully, the ISIS The OLbit (Over-load bit) in the LSP will be set. When the OLbit is set, it means that the device is overloaded, and the node will be skipped during route calculation, and the route to the downstream node will be blocked, although it will not affect the MPLS TE tunnel passing through the node. It is established and forwarded normally, but the ping and tracert of the MPLS TE tunnel of this node fail

The route in the MPLS TE tunnel is unreachable, so that TE ping and TE tracert fail, and the response message cannot be returned to the head node, resulting in the failure of detection and diagnosis of MPLS TE connectivity

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