This article is for troubleshooting BFD on multiple platforms.
Fortinet
Check BFD neighbors:
get router info bfd neighbor
Check BFD requests:
get router info bfd requests
Cisco
This command provides details of the configured BFD neighbors. This includes all neighbors independent of current state.
show bfd neighbor details
The show bfd summary command provides multiple quick outputs of the active client protocols.
show bfd summary client
This command shows BFD packets dropped on the local device and the reason. If local drops are incremented, this can cause sessions to flap.
show bfd drops