That’s right, sorry - had a short night and my brain is not at 100 % today 
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I’ve come across this:
So I set set sfp-sfpplus1 sfp-ignore-rx-los=yes and suddenly it’s working at auto-negotiation speed:
name: sfp-sfpplus1
status: link-ok
auto-negotiation: done
rate: 10Gbps
full-duplex: yes
tx-flow-control: no
rx-flow-control: no
supported: 10M-baseT-half
10M-baseT-full
100M-baseT-half
100M-baseT-full
1G-baseT-half
1G-baseT-full
1G-baseX
2.5G-baseT
2.5G-baseX
5G-baseT
10G-baseT
10G-baseSR-LR
10G-baseCR
sfp-supported: 1G-baseX
10G-baseSR-LR
advertising: 1G-baseX
10G-baseSR-LR
link-partner-advertising:
sfp-module-present: yes
sfp-rx-loss: no
sfp-tx-fault: no
sfp-type: SFP/SFP+/SFP28/SFP56
sfp-connector-type: LC
sfp-encoding: 64B/66B
sfp-link-length-om1: 20m
sfp-link-length-om2: 80m
sfp-link-length-om3: 300m
sfp-vendor-name: OEM
sfp-vendor-part-number: SFP-10G-T
sfp-vendor-revision: 02
sfp-vendor-serial: CSY103P64005
sfp-manufacturing-date: 25-06-11
sfp-wavelength: 850nm
sfp-temperature: 44C
sfp-supply-voltage: 3.318V
sfp-tx-bias-current: 6mA
sfp-tx-power: -3.01dBm
sfp-rx-power: -3.979dBm
eeprom-checksum: good
eeprom: 0000: 03 04 07 10 00 00 00 00 00 00 00 06 67 00 00 00 ........ ....g...
0010: 08 02 00 1e 4f 45 4d 20 20 20 20 20 20 20 20 20 ....OEM
0020: 20 20 20 20 00 00 90 65 53 46 50 2d 31 30 47 2d ...e SFP-10G-
0030: 54 20 20 20 20 20 20 20 30 32 20 20 03 52 00 3f T 02 .R.?
0040: 00 1a 00 00 43 53 59 31 30 33 50 36 34 30 30 35 ....CSY1 03P64005
0050: 20 20 20 20 32 35 30 36 31 31 20 20 68 80 03 c6 2506 11 h...
0060: 00 00 11 16 a8 62 1f 46 6b 61 e0 21 08 54 bc c0 .....b.F ka.!.T..
0070: 51 e7 02 00 00 00 00 00 00 00 00 00 dd 6c 40 86 Q....... .....l@.
0080: 5f 00 ce 00 5a 00 d3 00 8c a0 75 30 88 b8 79 18 _...Z... ..u0..y.
0090: 1d 4c 01 f4 19 64 03 e8 4d f0 06 30 3d e8 06 f2 .L...d.. M..0=...
00a0: 2b d4 00 c7 27 10 00 df 00 00 00 00 00 00 00 00 +...'... ........
00b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
00c0: 00 00 00 00 3f 80 00 00 00 00 00 00 01 00 00 00 ....?... ........
00d0: 01 00 00 00 01 00 00 00 01 00 00 00 00 00 00 f1 ........ ........
00e0: 2c 26 81 a4 0b b8 13 88 0f a0 00 00 00 00 80 00 ,&...... ........
00f0: 00 00 00 00 00 00 00 00 00 00 00 ff ff ff ff 00 ........ ........
Even though the link speed is shown as 10G in Winbox, Unraid reports “1000 Mbps, full duplex, mtu 1500”. I can’t force a speed though: When trying 1G baseT full, 1G baseT half and 1G baseX, there’s no link and I can’t ping the server via Winbox either. So it looks similar to what has been reported here: