Configure The Speed - Fortinet FortiGate FortiGate-3810A Install Manual

Using the AMC modules
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To change the media type for the proper transceiver, enter the following CLI
command:
config system interface
edit <interface_number>
set mediatype <sgmii-sfp | serdes-sfp>
end
For example:
config system interface
edit AMC-SW1/1
set mediatype sgmii-sfp
set speed auto
next
edit AMC-SW1/2
set mediatype sgmii-sfp
set speed auto
end

Configure the speed

You must also ensure the speed for the interface is correct for the installed
transceiver. Forcing the speed could result in link failure and disrupted service.
Fortinet recommends enabling link speed auto negotiation by setting speed to
auto.
Use the following command to configure the auto speed setting:
config system interface
edit AMC-SW1/1
set speed auto
end
FortiGate-3810A FortiOS 3.0 MR6 Install Guide
01-30006-0456-20080131
AMC modules