VLAN

[DethMAN]

What's the solution when I want to assign one port to a few VLAN? And how can I do it? 

[Bruce]

You need to switch the MX to 'VLANs' (as opposed to 'single VLAN') under 'Security & SD-WAN' -> 'Addressing & VLANs'. Then you'll be able to create multiple VLANs on the MX and create a trunk port with multiple VLANs on it.