How are you testing?TCP or UDP?Are you using `iperf`?`iperf3` includes a "retr" (retransmission) counter to know if you are fighting packet loss or "something else". I don't have 25Gbps setup in the lab but previously tested 40Gbps in my lab and `ipe...

Digging around I found this doc: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/s/hw/S3260/installb/S3260/replace.html#24127 Which details: Setting SIOC QSFP Port Speed Optional: Set the port speeds for the SIOC QSFP ports: Step 1 Conne...

Your VIC logs show what seems to be receiving something which is not expected:Sync_OK, then immediately NOT_Sync_OK. 230524-08:04:04.716813 paloerrd.paloerrd ERROR: INTR: discovered interrupt on Module NET Register MREGS_BMC_INT_PCS_RX value 0x1 on 3...

First change the Admin Speed drop down. I'm not 100% sure what 4x10Gbps options there are and which 4x10Gbps options work as I was usually changing to 40Gbps. Screenshots from some internal docs I wrote on the opposite issue (making 40Gbps work): Cha...

On the Network / SIOC1 / External Ethernet Interfaces tab: Try changing Port-0 to: Admin Speed = 4x10GbpsLink Training = Off From that same External Ethernet Interfaces tab you should see Link State column change to "Link Up" when working. The logs ...