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Configuration Guide - Reliability

S1720, S2700, S5700, and S6720 V200R010C00

This document describes the configuration of BFD, DLDP, VRRP, SmartLink, CFM, EFM, Y.1731 and MAC swap loopback to ensure reliability on the device.

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

Table 3-3  BGP convergence time

BFD Session

Link Fault Detection Mechanism

Convergence Time

Not bound

Keepalive packet mechanism

At the second level


BFD session in Down state

At the millisecond level


Figure 3-10  BFD for BGP

In Figure 3-10, 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: 2019-12-28

Document ID: EDOC1000141941

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