The earliest recollection of this bug is traced back to PAN-OS 8.1.3 - January 09, 2024. This bug is fixed in PAN-OS versions 8.1.3. Fixed an issue where a firewall frequently flapped a BGP session when the firewall did not receive any response from the BFD peer or when BFD was configured only on the firewall. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-3-addressed-issues