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Configuration Guide - Reliability

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, EFM Configuration, and CFM Configuration.
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Overview of BFD

Overview of BFD


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


To minimize the impact of device faults on services and improve network availability, a network device must be able to quickly detect faults in communication with adjacent devices. Hardware detection mechanisms, such as Synchronous Digital Hierarchy (SDH) alarms, can detect faults but are not provided by all forms of media. Hello packet detection mechanisms of the upper-layer routing protocol are used by applications to detect faults, but the detection duration is more than 1 second, which is too long for some applications. In addition, if no routing protocol is deployed on a small-scale Layer 3 network, the Hello mechanism cannot be used.

BFD addresses these issues and provides fast fault detection independent of media and routing protocols. BFD provides the following benefits:

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

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

Updated: 2019-03-21

Document ID: EDOC1000166606

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