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Hi,BFD over BGP has the following issue. BFD flap from time to time , while bgp session is restored and also bfd session.Do you know what to check? switch qfx5120. spine-leaf topologylogs:DAEMON-4-BFDD_STATE_UP_TO_DOWN: BFD Session 172.31.101.4 (IFL 0) state Up -> Down LD/RD(16/23) Up time:7w0d 17:02 Local diag: CtlExpire Remote diag: None Reason: Detect Timer Expiry.
This will generally indicate some kind of link or interface problem between the two devices. Here is the Juniper article of all the items to check.https://supportportal.juniper.net/s/article/M-MX-T-Troubleshooting-Checklist-BFD?language=en_US#BFD_flap