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CLI-based Configuration Guide - Reliability

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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Overview of BFD

Overview of BFD

This section describes Bidirectional Forwarding Detection (BFD).


BFD is a unified detection mechanism used to quickly detect link faults and monitor IP connectivity.


A network device must detect communications faults between adjacent devices quickly so that the upper layer protocol can rectify the fault and prevent service interruption. In practice, hardware detection is used to detect link faults while applications use the Hello mechanism of upper-layer routing protocols to detect faults. However, not all media are equipped with a hardware detection mechanism and the Hello mechanism may be too slow for some applications.

BFD addresses these issues and provides fast fault detection independent of media and routing protocols. BFD is useful because it can:

  • Quickly detect link faults between neighboring network devices. The detected faults may occur on interfaces, data links, or forwarding engines.

  • Provide uniform detection for all media and protocol layers in real time.


With BFD, you can improve network performance and adjacent systems can quickly detect communication faults so that a standby channel can be created immediately to restore communications and ensure network reliability.

Updated: 2019-05-17

Document ID: EDOC1000174116

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