I’m reaching out to see if anyone has successfully used a 100G-to-4x25G breakout cable with the MikroTik CCR2004-1G-2XS-PCIe.
I’m facing a recurring issue when connecting a Dell N3324T switch to the CCR2004-1G-2XS-PCIe using a breakout cable. The CCR2004 crashes immediately after plugging in the SFP28 connector, and the only way to recover is by rebooting the host computer.
I’ve tested two different cables—MikroTik’s XQ+BC0003-XS+ and a Dell breakout cable—but the issue persists with both. Oddly enough, these same cables work perfectly between the N3324T and another 25G NIC.
Has anyone encountered this problem or discovered a workaround? Your insights or suggestions would be greatly appreciated!
I’m using a 100g to 4x 25g breakout cable between my CRS504-4XQ and a CCR2004-1G-12S-2XS. I know, not exactly your setup, but the sfp28 port on both CCRs should be connected similar.
I had to disable auto-negotiation and manually set the links for 25G baseCR on the CRS504 side. With that the links come up and work flawlessly.
I don’t know about the CCR2004-1G-2XS-PCIe, since mine is only catching dust in the closet due to the lack of driver support on FreeBSD ): Whats your other config on the CCR, did you set interface pass-through for example? I can imagine that’ll involve the host during link establishment and as mentioned, I’m not convinced by the driver’s quality.
You also read the weirdest stories on the forum here about the PCIe card, e.g. it making the host hard reboot, when you restart ROS on the card.
If the above doesn’t work, you could try changing FEC mode on the uplink switch, post your CCR config here or ultimately open a support ticket with Mikrotik.
Today I tried yet another AOC breakout cable instead of the 2 DAC ones.
Still… no luck.
The CCR2004-1G-2XS-PCIe immediately died after I plugged in the SFP28 module, even when the QSFP28 end was not connected.
I finally decided to try the cable on my CCR2004-1G-12S+2XS, and it worked.
Therefore, I can confirm that this situation only occurs on CCR2004-1G-2XS-PCIe, not on other CCR models.