Fortigate "VLAN Switch" question

Forum|Forum|11 months ago
November 3, 2025
4 replies
450 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

FortiGate

funkylicious

SuperUser

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"

co666Author

New Member

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

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

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