XXV710 for 25GbE SFP28 recording CRC when using 25G-SR optics

[ARodr36]

The question is is there a way to check the signal on the INTEL side? The remote end is set to RS-FEC. No errors are seen on the switch, only on the intel NIC.

I also notice more errors with are seen when both interfaces are active in file transfers and when switch is in a forwarding mode of cut-through.

I don't see the issue when I use a copper SFP28 3 meter cable

System is running CentOS Linux release 7.0.1406

02:00.0 Ethernet controller: Intel Corporation Device 158b (rev 02)

netstat -i

Kernel Interface table

Iface MTU RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg

eno1 1500 39132473 0 1968 0 77116 0 0 0 BMRU

eno2 1500 0 0 0 0 0 0 0 0 BMU

ens2f0 1500 660153582805 54692 220376601 0 951323385811 0 0 0 BMU

ens2f1 1500 296165797983 79958 51730143 0 370485320414 0 0 0 BMRU

lo 65536 691346856 0 0 0 691346856 0 0 0 LRU

virbr0 1500 0 0 0 0 1 0 0 0 BMU

Any suggestions would be appreciated.

[idata]

HI Arod,

Thank you for posting in Wired Communities. Just to double check:1) What is the switch model used? 2) What is the SFP28 modules you used? Please make sure to use the validated model at https://www.intel.me/content/www/xr/en/support/network-and-i-o/ethernet-products/000023708.html Looking forward to your reply. Thank you.lRegards,Sharon

[ARodr36]

Thanks for the information. The switch was not really the issue as I got errors going NIC to NIC. We were not aware of the 3rd party SFP28 limitations with this NIC when we installed them in the operability wall for all new devices.

We will make a note and move on.

Thanks,

[idata]

Hi Arod,

Thank you for the update and additional information too. Please feel free to update me if further assistance needed.Thanks,Sharon