VLAN trunk between CRS125 and RB915G

Hi,
for my home setup i need to create a vlan trunk between a
CRS125-26G-1S-2HnD and a RB915G, and one to a server. I don’t seem to get how to do it :frowning:
My setup is the one in the diagram, i have it working with two RB915 with vlan interfaces and bridges, but the performance is …
So i got a CRS switch to replace the RB next to the server, but i want to configure the CRS for optimum performance.
I don’t seem to make the CRS and RB talk to each other.
What is the best configuration that can be created in this situation?

Thanks,

Ciprian