I'm trying to bring up the vlan interface without having a host attached. I've created the vlan interface, assigned ports to the vlan. At this point I just want to use a loopback plug to simulate a device being attached to the port and bring up the vlan interface. This is not working. Is there some caveats needed with the 3560G? Again these are gigabit ethernet ports. my loopback plug works on 10/100 ports (which I've tested).