quoted

How do you know you have connected a 400000baseLR4 to a
400000baseER4 with a 40Km and it is not expected to work, when looking
at ethtool? I assume the EEPROM contents tell you if the module is
LR4, ER4, or FR4?

      Andrew

Correct.

Hi Meir

Do you also have patches to Ethtool to decode these bits in the SFP EEPROM?

In addition, this is the terminology exposed in 50 Gbps and we
followed it.

Yes, i missed the patch which added those. I would probably of
objected. But we have them now, so lets keep going. But we might want
a clear definition of when modes can be combined like this.

  Andrew