Simple example for bfd+bgp
R1 1.4 config
set protocols bfd peer 192.0.2.2 source address '192.0.2.1'
set protocols bgp local-as '65001'
set protocols bgp neighbor 192.0.2.2 bfd
set protocols bgp neighbor 192.0.2.2 remote-as '65002'
R2 1.2.8 config
set protocols bfd peer 192.0.2.1 source address '192.0.2.2'
set protocols bgp 65002 neighbor 192.0.2.1 bfd
set protocols bgp 65002 neighbor 192.0.2.1 remote-as '65001'
Poweroff or set interface down on R1 and check bgp state on R2:
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.0.2.1 4 65001 5 5 0 0 0 00:00:08 Active
Be attention you may need to increase bfd timers if RTT for remote peer so big.