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CSS610-8G-2S+IN shows link on SFP+ ports but Intel X520 NICs never see it; SwOS 2.13rc12 works, later builds do not
A MikroTik CSS610-8G-2S+IN showed an active SFP+ link, but Intel X520-DA1/DA2 NICs (Windows, Linux, ESXi) reported no link, reproducibly across multiple transceiver pairs, DACs and two cards. Firmware 2.12, 2.13rc6, 2.13rc12, 2.13rc25 and the final 2.13 were tested. Hardware involved: MikroTik…
