Fault protection method, node and storage medium

Abstract

The invention discloses a fault protection method. The method comprises the steps that a first node determines that a first cross-domain node has a node fault, wherein the first node is the head nodeof a segment routing best effort serving SR-BE tunnel, the SR-BE tunnel is a cross-domain tunnel passing through a first IGP domain and a second IGP domain, the SR-BE tunnel passes through the first cross-domain node, and the first cross-domain node is a cross-domain node of the first IGP domain and the second IGP domain; the first node switches the transmission path of the service from the SR-BEtunnel to a standby tunnel, the standby tunnel does not pass through the first cross-domain node, the standby tunnel is a cross-domain tunnel passing through the first IGP domain and the second IGP domain, and the standby tunnel is a tunnel strictly displaying the path. The embodiment of the invention further provides a corresponding node and a storage medium. According to the technical scheme, the path which does not pass through the main cross-domain node is calculated in advance to serve as the standby tunnel, the standby tunnel is a tunnel strictly displaying the path, when the main cross-domain node breaks down, the transmission path of the service is directly switched to the standby tunnel, and the network reliability is improved.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to a fault protection method. Background technique [0002] Segment routing (SR) is a control plane that uses an interior gateway protocol (IGP) to transfer global or local multi-protocol label switching (MPLS) labels corresponding to SR routers. Methods. Segment routing best effort (SR-BE) is one of the segment routing methods. The optimal segment routing label-switched path (SR label) is calculated by IGP using the shortest path first (SPF) algorithm. switching path, SR LSP). [0003] Currently, for SR-BE, if the nodes in the path are in the same IGP domain, the alternate tunnel calculation method can be a topology-independent loop-free alternative path fast rerouting (topology Independent Loop-free-alternate algorithm, TI-LFA ) algorithm, TI-LFA algorithm calculates and expands P space, Q space, post-convergence shortest path tree according to the protecti...

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Problems solved by technology

[0004] However, when the nodes in the path are in two or more IGP domains, each two IGP domains include the active inter-domain node and the standby inter-domain node, and the route of one IGP domain is preferentially routed Notify to another IGP domain. When the primary cross-domain node fails, the application of the TI-LFA algorithm cannot automatically switch the packet forwarding to the standby cross-domain node. Usually, the failure of the primary cross-domain node is detected through IGP convergence. During the convergence process, the routing will still be forwarded to the main cross-domain node first, resulting in long-term packet loss and poor network reliability

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