Here is how you enable use of third party or unsupported transceivers such as SFP / SFP+ fiber optics on e.g., Juniper's JunOS and Cisco IOS.
Juniper:
set chassis allow-other-transceivers
Cisco:
service unsupported-transceiver
HP/Aruba:
allow-unsupported-transceiver
Dell:
allow unsupported-transceiver
Arista:
Arista Networks EOS shell
[admin@localhost ~]$ touch /mnt/flash/enable3px
[admin@localhost ~]$ sudo reboot
This is something seasoned network engineers know about, but there's no reason why this should be kept secret.
I will add more when I learn of them.