Technical Tip: Speed option 1000full not available on certain ports

This article describes the reason of missing speed option settings in FortiGate D/E series with NP6 and the FortiGate G series with NP7lite.

FortiOS D/E/F series with NP6 and FortiOS G series with NP7lite.

• Based on the standard, auto-negotiation of copper port is mandatory for 1G speed, therefore manually forcing 1G speed in CLI is no longer supported, this option has been removed permanently:

FortiGate-1100E (port1) # set speed

auto       <----- Automatically adjust speed.

100full    <----- 100M full-duplex.

• Due to this, the option is not available in the copper ports, but in the optical ones it is possible to configure:

FortiGate-1100E (port25) # set speed

1000full     <----- 1000M full-duplex.

10000full    <----- 10G full-duplex.

• More information can be found in the following sites:
  • IEEE standards
  • Why can't I turn Auto-Negotiation off on my Gigabit and 10 Gigabit links? - Noahdavids.org

• If the port needs to negotiate a 1G speed, the FortiGate port needs to be set to auto negotiation and the neighbor switch port can be configured for 1000full.