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Configuration Guide - Reliability

CloudEngine 8800, 7800, 6800, and 5800 V200R003C00

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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Border Gateway Protocol (BGP) enables the switch to periodically send Keepalive packets to its peers for fault detection. Detecting a fault using this method takes more than 1 second. When traffic is transmitted at gigabit rates, such slow fault detection causes significant packet loss. Association between BFD and BGP enables BFD to quickly detect faults on links between BGP peers and report the faults to BGP, implementing fast BGP route convergence. Table 2-3 lists BGP convergence time.

Table 2-3 BGP convergence time

BFD Session

Link Fault Detection Mechanism

Convergence Time

Not bound

Keepalive packet mechanism

Measured in seconds


BFD session in Down state

Measured in milliseconds


Figure 2-8 BFD for BGP

In Figure 2-8, SwitchA belongs to AS 100, and SwitchB belongs to AS 200. SwitchA and SwitchB are directly connected and establish an External Border Gateway Protocol (EBGP) connection. BFD monitors the status of the EBGP connection between SwitchA and SwitchB. When the link between SwitchA and SwitchB becomes faulty, BFD can quickly detect the fault and notify BGP.

Updated: 2019-05-08

Document ID: EDOC1100004359

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