Recently I purchased
CRS 212-1G-10S-1S+IN
and
CCR 1016-12S-1S+
I have SFP module 1.25G S-31DLC20D and LC-SC cable.
When I put SFP module to CCR 1016 it recognizes port without problem, and I have connectivity with device on other end.
When I put the same SFP module to CRS 212 it doesn’t even recognize connected port (no R, no led light).
what version of RouterOS are you running? I hit a similar problem recently when I upgraded to v6.45beta6 on my rb4011 - the SFP modules failed to even register in the hardware port.
As soon as I downgraded to the latest stable build, everything started workgin.