newb (sorta), don't hate: VLAN 101. Old Dell managed switch.

I have an ancient Dell Powerconnect 2708 8-port gigabit switch. (It was free.)

I want to make four (ish) ports of it appear as different interfaces on my Linux box, using VLAN to make this happen.

I want to do this so that I can assign some of those ports to my desktop VM(s), so that I can use these ports to configure odd and new network hardware (like the cheap Mikrotik kits in front of me) without impacting the rest of the LAN with errant DHCP servers and what-not.

I thought I had it set up. I plugged a Mikrotik device into what I thought was an somewhat-isolated port and was able to talk to it, but it was able to get a DHCP address from the router on a different VLAN.

This means to me that VLANs are not really working.

How do I use VLANs on this tired old switch to get independant connectivity that resembles different network devices on my Linux host?

(I had this set up once before, a year or so ago, but things change and get forgotten...and I don't think this way on any regular basis.)