Hello, I have a problem with connecting CRS326-24S + 2Q + RM with Huawei S6720-54C-EI-48S-AC switch. The connection is made using a MikroTik Q+DA0001 40GBPS QSFP+ cable.
Both devices can see the passive cable correctly. Interestingly, when 2 ports of the same device are connected (MikroTik and Huawei) through the MikroTik passive cable, the ports are rising.
Has anyone had a similar problem ?

Thank you in advance for your help.

What did you mean by "when 2 ports of the same device are connected (MikroTik and Huawei) through the MikroTik passive cable, the ports are rising." ?

If I connect 2 ports 40G with a MikroTik passive cable on a Huawei switch (making a theoretical loop) the ports are up.
If I connect 2 ports 40G with a MikroTik passive cable on a MikroTik CRS 326 switch (making a theoretical loop) the ports are up.
If I connect using the same cable Huawei to MikroTik ports remain down.

Please send us email about this at support@mikrotik.com

If I connect 2 ports 40G with a MikroTik passive cable on a Huawei switch (making a theoretical loop) the ports are up.
If I connect 2 ports 40G with a MikroTik passive cable on a MikroTik CRS 326 switch (making a theoretical loop) the ports are up.
If I connect using the same cable Huawei to MikroTik ports remain down.

Yes, I have the same problem.

When I used qsfp-qsfp DAC cable, the Huawei port is down, the CRS328 port is down.

ros version is 6.45.5 6.46.b38

good news!

you should disable HW switch "negotiation",enable CRS326 auto negotiation.

then the 40G port is up!
In CRS , It will show qsfp1 up (2,3,4 down), but you can see the qsfp1 port speed is 40G.

Hi
I currently have a s6320-54C-EI-48S, it is not possible to turn off auto negotiation on the 40GB ports, I have router version 7.12 installed and it is not possible to connect it in any way

Juan Ortiz