AUTO negotiation is not working properly with intel X520 Ethernet adapter,I set the speed and Duplex of X520 to 1.0Gbps Full Duplex and same settings in the switch,then it works.
problem is, X520 is a 10Gbps adapter and I can not set the speed of SFP+ port to 10Gbps.
Hope you understand,my English‘s poor.
There’s been reported issues with Intel >=10Gb Ethernet devices on the 2.13rc25 switch firmware. See: http://forum.mikrotik.com/t/css610-8g-2s-in-no-link-on-sfp-with-intel-x520/146985/1
Can you try the 2.13rc12 firmware on the switch and see if that helps? (search the forum for the box.com download links)