Fernando,
Do you see anything when you type
show edp ports all?
If not, there's a problem with the connection between both switches.
Your configuration would not work in Virtualbox if you chose the
Intel adapters, for example, because those adapters strip the vlan id information before transmitting it. You would have to use
PCnet-FAST III adapters to make it work, because those adapters don't mess with vlan tagging. See
https://forums.virtualbox.org/viewtopic.php?f=1&t=38037
Maybe there's a similar problem with your setup...