I must be missing something. I hope I'm overlooking something.
Opnsense 21.7.7 running on a Dell R420 with said T520-CR card installed & enabled in /boot/loader.conf.local file. Interfaces are assigned, cxl0=WAN / cxl1=LAN, with functioning FS SFP-10GLR-31 modules installed. The T520 interfaces light up when looped together, but when connecting the LAN to a Mikrotik CRS305-1G-4S+IN booting to SwitchOS it will not light up or pass traffic using FS-GB-GE-T SFP modules or the single RJ-45 port.
Any ideas? Am I missing something in the Mikrotik, the Dell BIOS, or in opnsense? The Mikrotik passes traffic on the RJ45 & the SFP ports when feeding it from the built-in copper on the Dell, but not with the TX520.
EDIT: Issue seems to be Mikrotik related. Another firewall with T422-CR cards is exhibiting the same symptoms with the Mikrotik, but not with an Arista switch.
EDIT: Tried using other 10GBASE-LR modules that currently work with the T420-CR card and an Arista switch in another Dell firewall, but still no link.
EDIT: Upgraded T520 boot rom and firmware. Same results. We know light is reaching the destination, but no live link unless we connect SFP to SFP on the card itself.
Guess I'll install pfSense and see what happens.