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I use 82599EN as below .
[82599EN]--[SFP:FINISAR FTLX8573D3BTL]--[optical cable]--[SFP:FINISAR FTLX8573D3BTL]--[Tester(SPIRENT C1)]
When I run an ixgbe dirver and enter "ifconfig eth2 up", link up and down are displaied repeatly in linux console.
Then, I read the Link Status Register — LINKS (0x042A4; RO).
read value is 0x79081113=0111_1001_0000_1000_0001_0001_0001_0011.
I organize above value to the register field of LINKS.
Signal Detect of 10 GbE Parallel (KX4, CX4 or XAUI).Bit[11, 10, 9, 8] shows lane <3,2,1,0> status, respectively.
For each bit:0b = A signal is not present (failed). 1b = A signal is present (good).
Signal Detect of 10 GbE serial (KR or SFI) success.
10G Align Status 0b
10 GbE Align_status failed (deskew process not complete).
I change SFP module to FINISAR FTLX8571D3BCV. FTLX8571D3BCV can work for 1GbE or 10GbE.
When I connect to 1GbE tester via this SFP module, 82599EN can keep a link up status.
What should I do at next step ?
Could you estimate causes which occur link up/down repeatly ?