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Method and device for realizing bidirectional forwarding detection

A bidirectional forwarding detection and implementation method technology, applied in the field of communication, can solve problems such as routing protocol oscillation, link failure error judgment, link state error detection, etc., and achieve the effect of adapting to high reliability and improving accuracy

Active Publication Date: 2014-08-13
NANJING ZHONGXING SOFTWARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the time for F packets to be transmitted between devices cannot be ignored, because there is a certain time difference between the time when the devices at both ends enable timeout detection, such as figure 1 As shown, when device A receives the BFD P packet and starts timeout detection, it may be because device B has not received the BFD F packet and has not yet sent the BFD detection packet. Therefore, device A cannot receive the BFD sent by device B. Detect packets, so that wrong judgments of link failures will be made
[0014] To sum up, in related technologies, there is a certain time difference between the time when the devices at both ends start the timeout detection, which will lead to incorrect detection of the link status. Detection can also cause problems such as routing protocol oscillation

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  • Method and device for realizing bidirectional forwarding detection
  • Method and device for realizing bidirectional forwarding detection
  • Method and device for realizing bidirectional forwarding detection

Examples

Experimental program
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no. 1 example

[0030] figure 2 It is a flowchart of a method for implementing bidirectional forwarding detection according to Embodiment 1 of the present invention, including the following steps:

[0031] Step S202, the first device receives the P (parameter negotiation) message sent by the second device;

[0032] Step S204, the first device replies with an F (parameter negotiation confirmation) message, and starts timing at the same time;

[0033] In step S206, if the BFD detection message sent by the second device is not received within the preset time, the link detection is started, and the BFD detection message is sent to the second device.

[0034] In this embodiment, after the device receives the P message, it will not immediately start the link detection (that is, timeout detection), but wait for a period of time by timing, if the timeout has not yet received the BFD detection message sent by the peer The link detection is only started to solve the problem in the related art that b...

no. 2 example

[0046] An OSPF neighbor relationship is established between two routers A and B of an operator. Due to the importance of the services carried between routers A and B, it is necessary to quickly detect and switch the link abnormality between router A and router B. To ensure service reliability, a BFD session is configured and established between Router A and Router B for bidirectional forwarding detection.

[0047] like image 3 The network diagram of Router A and Router B of an operator is shown. First, OSPF protocol is configured on Router A and Router B. At a certain moment, OSPF neighbors are discovered and a neighbor relationship is established; OSPF protocol notifies BFD to establish BFD corresponding to the OSPF link. session; the BFD session performs state machine switching by sending / receiving packets; after receiving the P / F packet and negotiating the time parameters of the link detection timer, BFD starts to perform fast link detection.

[0048] against image 3 Th...

no. 3 example

[0058] An operator establishes a pseudowire (Pseudo wire) in its backbone network to carry end-to-end user traffic. Since users have high requirements for traffic reliability, the operator deploys BFD detection between endpoints to speed up link abnormality detection. Discover and switch.

[0059] like Figure 5 Shown is a schematic diagram of an operator's backbone network. First, configure and establish a pseudowire between Router A and Router B to emulate end-to-end user traffic. At a certain point, the pseudowire is established normally and begins to forward user traffic; the pseudowire protocol notifies the BFD protocol to establish BFD for the pseudowire session; the BFD session performs state machine switching by sending / receiving packets; after receiving the P / F packet and negotiating the time parameters of the link detection timer, BFD starts to perform link fast detection.

[0060] Its implementation steps are as follows:

[0061] Step 1, configure and establish a...

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Abstract

The invention discloses a method and a device for realizing bidirectional forwarding detection (BFD). The method comprises the following steps that: a first device receives a parameter negotiation P message transmitted by a second device; the first device replies a parameter negotiation confirmation F message and starts timing at the same time; and if a BFD message transmitted by the second device is not received within a preset time, the first device starts link detection and transmits the BFD message to the second device. The method and the device enhance the link state detection accuracy of BFD and can well meet the requirement of a network on high reliability.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for realizing bidirectional forwarding detection. Background technique [0002] With the evolution of telecommunication networks to ALL-IP (all-IP) networks, the traditional Internet needs to be transformed into a multi-service carrier-class IP bearer network. In order to achieve further development and maturity, a carrier-class network must have a high reliability of 99.999%, the ability to quickly switch business flows, and robustness. That is, the IP bearer network of an ALL-IP network must provide 99.99% high reliability when providing Internet access services; when carrying voice services, interactive digital television (IPTV) and virtual private network (VPN, Virtual Private Network ) services, it is necessary to provide 99.999% high reliability, and at the same time provide a fast path switching mechanism for session-based services. Therefore, high r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26H04L12/70
Inventor 韦红波张磊
Owner NANJING ZHONGXING SOFTWARE
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