Hello Target,
This is normal behavior, it will show up properly as full duplex once you connect the link.
By default Junos shows interfaces that appear down as half-duplex. I'll try to find a kb and post it, but this is just because when the interface is shown DOWN the duplex setting will apear as half.
I have handy an EX4300, look at the samples.. for an interface up the duplex shows full, while the other half duplex, i can confirm that both interfaces have the same configuration
Model: ex4300-24p
Junos: 18.1R3.3
root@EX-DESTINATION# run show interfaces extensive ge-1/0/0
Physical interface: ge-1/0/0, Enabled, Physical link is Up
Interface index: 698, SNMP ifIndex: 564, Generation: 192
Link-level type: Ethernet, MTU: 8014, LAN-PHY mode, Link-mode: Full-duplex,
Speed: Auto, BPDU Error: None, Loop Detect PDU Error: None,
root@EX-DESTINATION# run show interfaces extensive ge-1/0/1
Physical interface: ge-1/0/1, Enabled, Physical link is Down
Interface index: 699, SNMP ifIndex: 565, Generation: 193
Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Link-mode: Half-duplex,
Speed: Auto, BPDU Error: None, Loop Detect PDU Error: None,
root@EX-DESTINATION# run show configuration interfaces | display set
set interfaces ge-1/0/0 mtu 8014
set interfaces ge-1/0/0 unit 0 family ethernet-switching interface-mode trunk
set interfaces ge-1/0/0 unit 0 family ethernet-switching vlan members all
set interfaces ge-1/0/1 mtu 8014
set interfaces ge-1/0/1 unit 0 family ethernet-switching interface-mode trunk
set interfaces ge-1/0/1 unit 0 family ethernet-switching vlan members all
Best Regards,
Cheers,
Benjamin