Re: 82599EN repeats Link Up and Down

Hi Taira,

  
Checking on the fiber module used, FINISAR FTLX8573D3BTL is not a supported fiber module for Intel X520 network adapter. Here is the website for reference: 

http://www.intel.com/content/www/us/en/support/network-and-i-o/ethernet-products/000005688.html

 If you are using Intel X520 server adapter, you need to check on the supported fiber module. If not, then please confirm the following information:

1) Are you using an onboard NIC? If yes, what is the brand and model of your system?
2) If it is onboard NIC, have you contacted the system vendor to check with them?
3) With regards to the autonegotiation, as stated on our README.txt 
https://downloadmirror.intel.com/13663/eng/README.txt

"An Intel(R) Network Adapter using fiber-based connections, however, will not
attempt to auto-negotiate with its link partner since those adapters operate
only in full duplex and only at their native speed."

4) Have you try testing on another switch to isolate the issue?


   Please feel free to update me.

Thanks,
wb