Hello,
I wonder if anybody ever used N9K-C9396PX with M4PC-CFP2 uplink board together with a CFP2 to QSFP28 converter. I have absolute nightmares getting it to link to a 9364C switch....
The CFP2 to QSFP28 converter is used on the M4PC-CFP2 in order to link through 2pcs. QSFP28 modules on both sides rather than to use CFP2 modules which are quite expensive nowadays. On the other side we have C9364C and a QSFP28 module on it. I had to do 'fec off' on the 9364C side in order to get the link up at all. It links and starts passing traffic through, however only when QSFP28-100G-SR4 with MPO/12 connector and patch cords are used. In case of the same port configuration and QSFP28-100G-LR4 with LC/UPC Duplex connectors, the link never goes up on the 9364C side however the 9396PX shows the port as flapping.
In case of QSFP28-100G-SR4 connection I have unreliable transmission. Rx/Tx power levels are good on each side however there are CRC packet errors received on the 9364C through the converter module. Also the port would flap once daily without any clue logged in on any of the switches' syslogs.
I have tried to force 100G with duplex full and no negotiate auto on each side however it couldn't help. Also the 9396PX doesn't support the 'fec off' command in order to disable it - it shows that the platform doesn't support FEC but anyway I wanted to have same configuration as much as possible. The NX-OS versions are 9.3.7 and the EPLD version is also 9.3.7.
I'm not sure how could it be but the weirdest thing is that I just replace the SR4 modules with LR4 and the link won't connect anymore. I have also searched for some power setting in order to enable/disable power management feature but can't find. Is there any chance to have insufficient power delivered by the M4PC to the CFP2 converter? I'm stuck. Any ideas would be appreciated.
Thank you.
