The earliest recollection of this bug is traced back to PAN-OS 8.1 - July 22, 2025. This bug is fixed in PAN-OS versions 8.1.2. Fixed an issue where an Aggregate Ethernet (AE) interface with Link Aggregation Control Protocol (LACP) enabled on the firewall went down after a cisco-nexus primary virtual port channel (vPC) switch LACP peer rebooted and came back up. An Aggregate Ethernet (AE) interface with Link Aggregation Control Protocol (LACP) enabled on the firewall goes down after a cisco-nexus primary virtual port channel (vPC) switch LACP peer reboots and comes back up. Workaround: Set a hold time on the AE interface by running the debug l2 ctrl dlacp set hold-time CLI command. The hold time (default is 15 seconds) specifies the delay before the firewall processes LACP protocol data units (PDUs) after LACP-enabled interfaces come up. For more information: https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-2-addressed-issues https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-release-information/known-issues/known-issues-related-to-pan-os-8-1-releases