Hi, and thank you for your answer.
But it seems the problems is much more complex than a bug.
It turns out that the backplane is only 80G, so we can only have 2x40G ports and 0x10G port active, or 1x40G port and 4x10G ports active. Or 0x40G ports and 8x10G ports active.
As seen here: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/hardware/sup_install/b-c9400-sup-note.html#id_53674
Unfortunately, it gets worse.
I have 2 supervisors, and even though my understanding was the each module had a 80G backplane, it seems that my 2 supervisors shares the backplane?
Because when i enable the ports fo5/0/9 and fo6/0/9, all other ports go inactive.
So, I have 2 options: Have only 1 usable 40G port on each supervisor or 4 10G port on each supervisor.
All other ports become unusable..
Come on Cisco, of all ridiculous things you are doing, this must go into the top 10 list!
Why not put on oversubscription or something instead?
Sometimes (almost always) the number of ports is more important than speed. It'not like we are running a constant stream of 40G traffic on multiple ports (yet)
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