External zones are required to allow traffic between zones in different virtual systems, without the traffic leaving the firewall.
https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/virtual-systems/communication-between-virtual-systems/inter-vsys-traffic-that-remains-within-the-firewall/external-zone#:~:text=External%20zones%20are%20required%20to%20allow%20traffic%20between,needed%20to%20allow%20traffic%20between%20two%20virtual%20systems.
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Mohamed_Waly
5 days, 6 hours ago