routing between 2 internal virtual switches

Hi Hyper V Expert,

We have one Hyper V host server running windows server 2012 standard. there are 2 VMs that are each connected to different virtual switch, called "switch1" and "switch2". both of the VM has different subnet "192.168.10.x" and"192.168.20.x". how do I doing routing between two different virtual switch? Since it is the internal virtual switch, the traffic should not leaked to the external physical network.

Thanks.

Regards,

H