PCIe card XL710 QDA2 QSFP to switch Mikrotik CRS326 24S 2Q in 40G mode not link

Q:

We try to connect server with PCIe card XL710-QDA2 QSFP ports to switch CRS326-24S+2Q in 40G mode with DAC QSFP on both sides cable - link dont go up in various modes. We connected server to Juniper QFX5100 without problems, so card and cable are good. Do your card has vendor lock for cables types?

A:

Dear, what length of the QSFP+ DAC are you using? Pls check this page from Mikrotik, seems the CRS326-24S+2Q could only support 1m length. You may further check with Mikrotik company to verify.
https://help.mikrotik.com/docs/display/ROS/MikroTik+wired+interface+compatibility
If you need further support from us, pls send email to info@10gtek.com with your Purchase order # for the XL710-QDA2 NIC and QSFP+ DAC.