Networking :: Virtual Interfaces For Bridge For Performance Testing

Now doing some research about performance of Linux switch. I'll start with basic structure of my system: PC1 is connected to PC2 - both have 1 NIC so not much to add.PC2 eth0 is divided in VLAN`s as far as maximum of 4094. Every VLAN has it's own switch (bridge). On PC1 when I run a test I just make VLAN/configure IP address and stream data to IP that's configured for that bridge on PC2.But now I want to add one more interface to each bridge, so I could stream from PC1 through bridge to Virtual interface (just an endpoint out of bridge). I could possibly add one more computer, physical interface to PC1 and make it work, but is there any way to make this work with virtual interfaces, like tun or something? Making just a simple tun interface and adding it to bridge, as you understand, doesn't do the trick, I need some kind of other endpoint that /virtually/ connects to tun interface. Maybe someone has made some kind of script or something? Using Iperf for my tests.