Mellanox 25G AOC works between MikroTik switches but not on an Intel X722 (ixl) in pfSense
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The poster tried a Mellanox MFA2P10-Axxx 25G SFP28 AOC between a MikroTik switch and a Supermicro server with an Intel X722 (ixl driver) under pfSense. The cable linked fine switch-to-switch but on the X722 ifconfig -vvvm showed the module recognised (10GBase-SFI, 1000Base-KX listed) yet no carrier and zero signal. Attempts to force speed via sysctl returned read only and loader.conf.local settings produced Operation not supported by device; the cable reportedly needs a manually set speed to disable its CDR, which the ixl driver did not allow.
- Hardware: Intel X722, Supermicro server, MikroTik switch
- Transceivers: Mellanox MFA2P10-Axxx SFP28 AOC
- Form factor: SFP28, AOC
Symptoms / messages:
no carrier
Operation not supported by device
media type cannot be changed on ixl
Comments 1
Check module recognition and available speeds with ifconfig -vvvm; set a fixed media type or use the advertise_speed sysctl for negotiation; try a different cable (a 10G copper DAC had worked before).