Configuring an interface to serve as the gateways of two network segments on the firewall

The USG supports configuring a subinterface to enable an interface to serve as the gateways of two network segments:
#
interface GigabitEthernet1/0/3.1
vlan-type dot1q 10
alias GigabitEthernet1/0/3.1
ip address 10.3.1.1 255.255.255.0
#
interface GigabitEthernet1/0/3.2
vlan-type dot1q 20
alias GigabitEthernet1/0/3.2
ip address 10.3.2.1 255.255.255.0
#

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