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> Chapter 21 - Networking > Interfaces > Physical


FortiGate units have a number of physical ports where you connect ethernet or optical cables. Depending on the model, they can have anywhere from four to 40 physical ports. Some units have a grouping of ports labelled as lan, providing a built-in switch functionality.

In FortiOS, the port names, as labeled on the FortiGate unit, appear in the web-based manager in the Unit Operation widget, found on the Dashboard. They also appear when you are configuring the interfaces, by going to Network > Interface. As shown below, the FortiGate‑100D (Generation 2) has 22 interfaces.

note icon Two of the physical ports on the FortiGate-100D (Generation 2) are SFP ports. These ports share the numbers 15 and 16 with RJ-45 ports. Because of this, when SFP port 15 is used, RJ-45 port 15 cannot be used, and vice versa.

These ports also share the same MAC address.
FortiGate-100D interfaces on the Dashboard

Configuring the FortiGate-100D ports

Normally the internal interface is configured as a single interface shared by all physical interface connections - a switch. The switch mode feature has two states - switch mode and interface mode. Switch mode is the default mode with only one interface and one address for the entire internal switch. Interface mode enables you to configure each of the internal switch physical interface connections separately. This enables you to assign different subnets and netmasks to each of the internal physical interface connections.

The larger FortiGate units can also include Advanced Mezzanine Cards (AMC), which can provide additional interfaces (Ethernet or optical), with throughput enhancements for more efficient handling of specialized traffic. These interfaces appear in FortiOS as port amc/sw1, amc/sw2 and so on.