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Path detection method and device, controller and PE equipment

A path detection and controller technology, applied in the field of data communication, can solve problems such as unreliable path detection

Pending Publication Date: 2022-01-07
MAIPU COMM TECH CO LTD
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Problems solved by technology

Since the shortest path is usually inconsistent with the forwarding path corresponding to the segment list, when the segment list forwarding path forwards normally but the shortest path forwarding fails, the detection result will be mistaken for an error in the segment list forwarding path, thus making path detection unreliable

Method used

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  • Path detection method and device, controller and PE equipment
  • Path detection method and device, controller and PE equipment
  • Path detection method and device, controller and PE equipment

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Embodiment Construction

[0027] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It should be noted that terms such as "first" and "second" are only used for distinguishing descriptions, and should not be understood as indicating or implying relative importance.

[0028] The applicant found that in the SR-based network system, when checking the validity of the link corresponding to the BFD session, at present, the ingress PE sends the BFD message to the egress PE according to the forwarding path corresponding to the segment list. After the egress PE receives the BFD packet, it uses the shortest path between the egress PE and the ingress PE to reversely send the BFD packet to the ingress PE. Since the forwarding path corresponding to the segment list is not necessarily the shortest path, when the forwarding path corresponding to the segment list is actually in a normal state and th...

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Abstract

The invention provides a path detection method and device, a controller and PE equipment. The method comprises the steps that according to a segment list from an entrance PE to an exit PE, a reverse segment list corresponding to the segment list is calculated, and forwarding paths corresponding to the reverse segment list and the segment list are the same, and forwarding directions are opposite; and issuing the reverse segment list to an exit PE, wherein the reverse segment list is associated with the segment list. Thus, after the exit PE receives the BFD message sent based on the segment list, the BFD message can be forwarded back to the entry PE through the reverse segment list, the problem that path detection is inaccurate due to the fact that the path of sending the BFD message by the entry PE is inconsistent with the path of returning the BFD message by the exit PE is avoided, and the reliability and accuracy of path detection are improved.

Description

technical field [0001] The present application relates to the technical field of data communication, and in particular, relates to a path detection method, device, controller and PE equipment. Background technique [0002] In a network system based on SRv6 (Segment Routing, segment routing), it is necessary to continuously check the validity of links corresponding to BFD (Bidirectional Forwarding Detection, bidirectional forwarding detection) sessions. During the detection process, the ingress PE (Provider Edge Device, service provider edge device) in the network system needs to send the BFD message to the egress PE. Among them, the SRH (Segment Routing Header, segment routing header) structure of the BFD message is added with a corresponding segment list (Segment List), and the BFD message will be forwarded from the ingress PE to the egress PE according to the forwarding path corresponding to the segment list. Wherein, the segment list refers to a list composed of SIDs (se...

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Application Information

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IPC IPC(8): H04L45/02H04L45/74H04L45/24
CPCH04L45/02H04L45/74H04L45/24
Inventor 郝方超
Owner MAIPU COMM TECH CO LTD
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