Skip to main content
co666
co666
New Member
November 3, 2025
Question

Fortigate "VLAN Switch" question

  • November 3, 2025
  • 1 reply
  • 413 views

Hi all,

I am configuring various VLANs (for internal routing & internet access etc) on the "VLAN Switch" feature of the Fortigate. Everything is working correctly but I would like to add more Physical Ports to the "VLAN Switch" interface. My question is, how does that work, if I plug 5 more physical Fortigate ports into my Switch with the correct VLAN tagging/untagging and add them to the VLAN Switch, will it just use all the ports for the traffic? Will it cause loops ? Not finding any information that explains that.

Thanks

1 reply

funkylicious
SuperUser
funkylicious
SuperUser
November 3, 2025

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Hardware-switch-Software-switch-VLAN-switch-Use/ta-p/210153

you add more ports to it, they all become part of the same... switch

"jack of all trades, master of none"
    co666
    co666Author
    New Member
    November 3, 2025

    Thanks for this. Explains it a lot better. So does adding port ports to the VLAN switch aggregate the connections to the VLAN switch with multiple VLAN interfaces?

    Toshi_Esumi
    SuperUser
    Toshi_Esumi
    SuperUser
    November 3, 2025

    As @AlexC-FTNT 's KB @funkylicious referred to shows, a VLAN switch never "aggregate" multiple ports (LAG). Those members of a VLAN switch carry the same packets multiplied and deliver them to all ports. You can configure VLANs on a LAG but a LAG can not be a member of a VLAN switch.

    Toshi

    Terms & ConditionsAccessibility statement