It's easy to get confused by Palo Alto's various uses of VLAN.
A "VLAN" interface is different from a "Layer 3" interface that has 802.1q vlan tags enabled.
On a PA device "VLAN" interfaces are used to create a virtual switch using ports on the firewall, and allow them to operate as layer 2 interfaces without routing abilities. Essentially, it create a bridged interface using all the VLAN interfaces.
If you want to enabled tagged (or untagged) 802.1q vlans on interfaces, then configure them as "Layer 3" and create sub-interfaces with the vlan tag set there.
Would be nice if PA updated their UI to remove the ambiguous and confusing "VLAN" interface type. "Bridge" would be more accurate.
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