Skip to main content
Rabeb_Ali
Rabeb_Ali
Explorer II
May 18, 2026
Question

FortiSwitch SFP+ to 1G SFP interoperability with forced 1G speed

  • May 18, 2026
  • 2 replies
  • 39 views

Hello,

Is it possible to establish a fiber link between:

  • a FortiSwitch SFP+ port using a 10G SFP+ transceiver
  • and a third-party switch using a 1G SFP transceiver

by forcing the FortiSwitch interface speed to 1G?

I would like to know if:

  • SFP+ transceivers on FortiSwitch support 1G operation
  • or if both sides must use the same transceiver type/speed (SFP↔SFP or SFP+↔SFP+)

Has anyone tested this successfully with FortiSwitch and third-party switches?

Thank you.

2 replies

Anthony_E
Staff
Anthony_E
Staff
May 18, 2026

Yes it could be possible if the port is supporting multi speed.

Could you please tell me which model of FortiSwitch you use?

 

Anthony

Best Regards

Best Regards
F
FarinaAhmed
Explorer
May 18, 2026

Usually no, a 10G SFP+ transceiver will not reliably link with a 1G SFP transceiver just by forcing the FortiSwitch port to 1G. Both sides should normally use compatible optics and speed, so use 1G SFP on both sides for a 1G fiber link, or 10G SFP+ on both sides for a 10G link. Some SFP+ ports support 1G, but the optic must also support 1G.

    Terms & ConditionsAccessibility statement