PA-3000 Series and PA-500 firewalls support larger networking capacities in PAN-OS 7.1 than in earlier PAN-OS releases. The increase is a doubling of capacity unless you executed the
debug system arp-mac-capacity increase
operational command (available in PAN-OS 6.1 and 7.0.1 releases) on a PA-3020 or PA-3050 firewall, in which case you already doubled the capacity.
If you decide to downgrade to an older PAN-OS release and you want to keep the larger capacities, see
Downgrade While Maintaining Enhanced Capacities on PA-3050 Firewalls and PA-3020 Firewalls.