How do I enable Subinterfaces for a Trunk?

Question

Hello all, 
 I'm used to another known firewall vendor but I decided to give this for my home network a try since the other solution is way too expensive. 
 My goal is to use a single link between my switch and my Sophos appliance so I do not need lots of cables for every single vlan I plan to implement 
 
 This is my setup:

I use a Cisco switch 
 
 sw e0/1 configured with access vlan 10, e0/2 with access vlan 20 
 sw e0/0 is configured as enq1 trunk which carries vlan 10 and 20 
 How do I set this up on Sophos? I am used to subinterfaces which means I enable the parrent interface which does not need an ip address and then I can create subinterfaces below it with the vlan tags for the subinterfaces. How does this work on Sophos? 
 
 I configured vlans and put them into a zone and I also created a dhcp server in that vlan on the Sophos but my clients won't receive an ip address. I have no problems if I do not use a trunk between the switch and the fw and just a single vlan

rfcat_vk · Answer

Hi, 
 you create each VLAN in the XG and the;you tag them in your switch. 
 ian