Re: Intel X710 (X710DA4) link Down

Hi Konstantin_1975,

Thank you for the post. I am thinking it might be the module used that is causing the link down. 

The supported SFP LR module for Intel X710 is E10GSFPLR, please refer to the URL below: 
http://www.intel.com/content/www/us/en/support/network-and-i-o/ethernet-products/000007045.html

The  Intel DUAL RATE 1G/10G SFP+ LR (bailed) FTLX1471D3BCV-IT module you have is applicable for X520 series network adapter.http://www.intel.com/content/www/us/en/support/network-and-i-o/ethernet-products/000005688.html

Also, will you encounter the same issue if using other switch? 

Thanks,
wb