How to setup Fortigate running Ha with two Core Switches

Forum|Forum|4 months ago
April 7, 2026
4 replies
158 views

Hi

Im trying to connect two core switches to out Fortigates that running in HA

The Fortigates have been running for 3 years together with some old Alcatel Lucent switches, and now I want to upgrade to FortiSwitch

This is my setup.

Skærmbillede 2026-04-07 123145.png

Best Regards

Thomas

ebilcari

Staff

You can refer to this section (Determining the network topology) of the FortiLink Guide.

Emirjon

THT_3008Author

New Member

Hi again

Sorry but it will not work.
As I see it i should use
HA-mode FortiGate units using hardware-switch interfaces and STP | FortiSwitch 7.6.5 | Fortinet Document Library
But it seems not to work

The port on the two switches also look different to each other
Skærmbillede 2026-04-07 150942.png Skærmbillede 2026-04-07 150915.png

Port 27 should no be default.fortilink.... should it?

ebilcari

Staff

I think a two-tier topology and using MCLAG would be a better approach.

Emirjon

THT_3008Author

New Member

Its still not working.
And now I see this picture
The port on the FortiSwitch is Normal ports instead of Fortilinks
Skærmbillede 2026-04-09 131542.png Skærmbillede 2026-04-09 131245.png

Sign up

Login with SSO

Login to the community

Login with SSO