This document specify how to aggregate multiple interfaces on PA to acts a single logical interface.
For PAN-OS versions 6.1.x & above, the following Palo Alto Networks firewalls support LACP: PA-500, PA-3000 Series, PA-4000 Series, PA-5000 Series, and PA-7050. The firewalls support LACP for HA3 (only on the PA-500, PA-3000 Series, PA-4000 Series, and PA-5000 Series), Layer 2, and Layer 3 interfaces.
Step 1. Create an Aggregate Interface
Step 2. Enable LACP. Make sure at least one side is in active mode.
Step 3. Assign physical interface to Aggregate interface
Verification command: PA> show lacp aggregate-ethernet all