VMware ESXi setup of Vlans

open up the vmware infrastructure client
select the server
select configuration from the tabs in the header
select networking from the hardware list on the left
select add networking in the top right
select "Virtual Machine" and click next
select "Create a virtual switch" and click next
Enter a name for the switch (don't worry about vlan IDs)

rinse and repeat for any other subnets you want to have.

when you build the virtual machines that you want to route with make sure you have more then one virtual interface per machine and connected to more than one virtual switch.

physical interfaces come in to play is if you want to have these virtual switches connect to your physical lan