Hi,
First of all, sorry about my newbie knowledge in networking 
So, I have a 4011iGS for years and now I bought CRS326 switch and I connected them with 10gbit DAC cable on SFP+
My problem, the communication is not working through this cable (regular mode ethernet cable in ethernet ports automatically working). I have basic config, nothing changed. I upgraded to the newest version both.
Switch side, SwOS: I can see the TX is working, RX is empty and RXM Mac Errors increasing.
Links are OK, I can see the connection speed (10g), They are on similar IP range (192.168.0.1 and 192.168.0.2 and perfectly working with ethernet cable, as I mentioned before).
What I need to set on my router side and on switch?
Thank you.