CLI command full duplex

As documented in the CLI reference it depends what model you' re using: speed <interface_speed> The interface speed: auto • auto, the default speed. The interface uses auto-negotiation to determine the connection speed. Change the speed only if the interface is connected to a device that does not support auto-negotiation. • 10full, 10 Mbps, full duplex • 10half, 10 Mbps, half duplex • 100full, 100 Mbps, full duplex • 100half, 100 Mbps, half duplex • 1000full, 1000 Mbps, full duplex • 1000half, 1000 Mbps, half duplex Speed options vary for different models and interfaces. Enter a space and ? after the speed keyword to display a list of speeds available for your model and interface. You cannot change the speed for interfaces that are 4-port switches. This includes the internal interfaces of FortiGate models 60, 60M, 100A, 200A, and FortiWiFi-60. This also includes the LAN interface of the FortiGate-500A.

Thanks for the quick responce; We have a 100a and are upgrading the service with our ISP, the ISP requres the port to be hardcoded to 10 Mbps full duplex (they do not support auto-negotiation). So would " conf sys int edit external set speed 10full end" be the answer?

Yeah, that should do the trick. You can check the port speed with this command: diagnose hardware deviceinfo nic will give you the list of ports and then diagnose hardware deviceinfo nic port1 port1 for example will give you the details on interface settings for port1 including speed.

You can set the speed of the internal switch interface depending whether you have your internal switch in interface mode or switch mode in the config sys interface or config sys global R.

Thanks again for the help and pointers.