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BFD detection method, equipment and system

A bidirectional forwarding detection and peer device technology, applied in the field of communication, can solve problems such as inability to perform BFD, negotiation sessions, and link errors

Active Publication Date: 2015-06-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the research and practice of the prior art, the inventors of the present invention found that due to various factors, such as not enabling the BFD function, or not configuring BFD detection, or configuring wrong parameters, or BFD configuration is in admindown state, or link error, etc., may cause the failure of the BFD negotiation session, resulting in the failure of the BFD session to be established. There is no solution for locating such faults in the prior art

Method used

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  • BFD detection method, equipment and system
  • BFD detection method, equipment and system
  • BFD detection method, equipment and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This implementation will be described from the perspective of a detection requesting end (that is, an active end); the detection requesting end may specifically be a device such as a router or a switch.

[0054] A method for detecting BFD, comprising: sending a polling request message to a peer device before establishing a BFD session; determining whether to receive the BFD configuration status information returned by the peer device within a set time Polling response message; if the polling response message carrying the BFD configuration status information of the peer device returned by the peer device is received within the set time, it is determined that the peer device is reachable, and according to the BFD configuration information of the peer device The configuration status information determines the BFD detection capability of the peer device; if the peer device does not receive a polling response message carrying the BFD configuration status information of the pe...

Embodiment 2

[0079] This embodiment will be described from the perspective of a detection responder, and the detection responder may specifically be a device such as a router or a switch.

[0080] A method for detecting BFD, comprising: receiving a polling request message sent by a peer device; and returning a polling response message to the peer device, wherein the polling response message carries BFD configuration status information of the local device.

[0081] see figure 2 , the specific process can be as follows:

[0082] 201. Before establishing a BFD session, receive a polling request message sent by a peer device; wherein, the polling request message may adopt a format of a BFD control message.

[0083] It should be noted that since this embodiment is described from the perspective of the detection responder, the peer device in this embodiment refers to the detection requesting end device, and the local device refers to the detection responding end device.

[0084] 202. Return a...

Embodiment 3

[0098] According to the methods described in Embodiments 1 and 2, examples will be given below for further detailed description.

[0099] In this embodiment, description will be made by taking device A as a detection requesting end (ie as a detection requesting device) and device B as a detection responding end (ie as a detection responding device) as an example.

[0100] see image 3 , the specific flow of the method for detecting BFD can be as follows:

[0101] 301. Before establishing the BFD session, device A sends a polling (Poll) request message to device B. If the link is normal, device B can receive the polling (Poll) request message, that is, execute step 302; if the link failure, then device B cannot receive the polling (Poll) request message, that is, directly execute step 304;

[0102] Wherein, the polling request message may adopt a format of a BFD control message.

[0103] 302. After device B receives the polling request message, if device B has enabled the BF...

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Abstract

The embodiment of the invention discloses BFD (Bidirectional Forwarding Detection) detection method, equipment and system. In the embodiment, a poll request message is sent to terminal equipment before setting of a BFD session, so as to determine whether the terminal equipment can be reached or not according to whether a poll response message returned by the terminal equipment can be received or not within a set period of time, and if the terminal equipment can be reached, whether the BFD detection capability is effective is further judged according to the BFD configuration state to the terminal equipment, which is carried in the poll response message, so that BFD failures can be perceived promptly and the failure cause can be accurately positioned.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a method, device and system for detecting Bidirectional Forwarding Detection (BFD, Bidirectional Forwarding Detection). Background technique [0002] Bidirectional Forwarding Detection (BFD, Bidirectional Forwarding Detection) is a detection technology used to quickly detect whether the forwarding path between a pair of forwarding engines is available, which provides a low overhead and short detection period between two adjacent systems The failure detection mechanism mainly includes the detection of the interface, the detection of the data link and the detection of the forwarding engine itself. [0003] BFD is similar to the "Hello" protocol ("Hello" protocol). When the BFD session between the two systems to be detected is established, the two parties will periodically send BFD control packets to each other, and BFD is also enabled. On the link with the functio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26H04L12/70H04L12/24
Inventor 汪祖亮苏鹏刘宇段瑞刘艳军班玲
Owner HUAWEI TECH CO LTD
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