Technical Tip: Interface Trunk on FortiSwitch

When the FortiSwitches are connected to a third-party switch,  there are two kinds of interfaces to connect them.

On FortiSwitches, an interface trunk is a LAG interface (boundle interface, could be LACP).  In a interface port,  it is possible to add VLANs to be transmitted on the same port with its VLAN tag ID.

These are configuration examples.

Note:

These examples are on FortiSwitch standalone.

Configuring a LACP interface, active mode:

config switch trunk

    edit "To_third_party_device"

        set mode lacp-active           <-----Enable LACP active mode.

        set members "port11" "port12"  <----- Members of LACP interface.

config switch interface

    edit "To_third_party_device"

         set native-vlan 10            <-----  VLAN without tag on interface trunk.

         set allowed-vlans 322,351     <----- Tagged VLANs on interface trunk.

configuring a port with VLAN tagging:

config switch interface

    edit "port27"     <----- Port to configure.

         set native-vlan 10 <----- VLAN without tag.

        set allowed-vlans 1,2,5-10  <----- Tagged vlans.