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Bidirectional forwarding detection (BFD) method and system

A technology for two-way forwarding detection and detection packets, applied in the field of communication, which can solve the problems of disconnection, disconnection, and a large number of packet loss.

Inactive Publication Date: 2011-05-18
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently, BFD is only applicable to detecting link connectivity, that is to say, the link information obtained through BFD is either connected or disconnected.
In some cases, the link usually loses a small amount of packets first, then loses a large amount of packets, and finally breaks the link.
When there is a small amount of packet loss in transmission, the current BFD may not be able to detect it. At this time, the business may have been affected, but BFD needs to wait until the packet loss reaches a certain level to detect the link failure.

Method used

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  • Bidirectional forwarding detection (BFD) method and system
  • Bidirectional forwarding detection (BFD) method and system
  • Bidirectional forwarding detection (BFD) method and system

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Embodiment Construction

[0028] The main idea of ​​the two-way forwarding detection method and system of the present invention is to detect network quality, such as packet loss, delay, jitter, etc., while detecting network continuity, and apply it to all systems that need to enable BFD detection links. The detected network quality can be used as a reference for upper-layer services. When the network status is unstable but BFD does not break the link, effective prevention is carried out to prevent the link from taking measures when the link actually fails, causing service interruption.

[0029] Such as figure 1 As shown, the two-way forwarding detection method of the present invention includes:

[0030] Step 101: The local end of the bidirectional forwarding detection (BFD) sends the first detection message carrying the network quality detection information;

[0031] Step 102: The BFD peer receives the first detection message, and sends a second detection message carrying network quality detection inf...

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Abstract

The invention relates to a bidirectional forwarding detection (BFD) method and a BFD system. The BFD method comprises the following steps that: a BFD home terminal transmits a first detection message which carries network quality detection information; a BFD opposite terminal receives the first detection message and transmits a second detection message which carries the network quality detection information; the BFD home terminal receives the second detection message and detects network quality according to the network quality detection information of the first detection message and the second detection message; and the BFD home terminal reports a network quality detection result according to a preset reporting condition. The BFD method and the BFD system can effectively prevent chain scission.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a method and a system for realizing double-transmission and forwarding detection through a BFD protocol. Background technique [0002] BFD (Bidirectional Forwarding Detection) provides a common low-overhead fast fault detection service for various upper-layer control protocols. The upper-layer control protocols can use the services provided by BFD to decide to take corresponding actions, such as rerouting. The reason why it is called bidirectional is that the BFD protocol can provide connectivity detection in the two directions of the link through the three-way handshake mechanism. BFD can quickly detect interface and link failures on the forwarding path, node forwarding engine failures, etc., and notify the upper-layer protocol of the failure, so that the upper-layer protocol can quickly converge. [0003] Currently, BFD is only applicable to detecting link co...

Claims

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Application Information

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IPC IPC(8): H04L12/26H04L12/56H04L29/06
CPCH04L12/2602H04L43/00
Inventor 周蕙菁
Owner ZTE CORP
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