Config Trunk Ports between Fortigate and Fortiswitch

KennyLi · ‎10-10-2023

Hi All,

I am suffering by the trunk port crash when two trunk ports plugged between Forigate and Fortiswitch

Environment: I am using 1x Fortigate 80F, 1x Fortiswitch 124F-POE and 6x FortiAP 431F.

The cable connections are below:

a. 6x FortiAPs are connected with 124F (Port 1 - 6) with PoE enabled

b. 80F is connecting with 124F as below:

i) Fortilink Ports: 80F dedicate Ports (a and b) connect to 124F (23 and 24 Ports)

ii) Trunk Ports: 80F (Port 5 and 6 ) connect to 124F (21 and 22 Ports)

The trunk port configured as:

i) MC-LAG: disabled

ii) Mode: Static

iii) Enabled Features: Edge Port and Spanning Tree Protocol

When I configured the trunk port and plug two cables to the port, all the port in the switch crashed, because I cannot ping the gateway in 80F as well as the FortiAP will lost the configuration and failed connect with wireless devices (no SSID showed). Only the network resumed if unplug one of the trunk ports.

I have tried but no luck:

a) Removed the Edge Port in trunk ports

b) Change to another ports as new trunk ports

c) Replace the Cat 6 cables.

Please can you help on this?

Thanks

Ken

ebilcari · ‎10-11-2023

You have to create a normal VLAN on the Switch controller and assign an IP and a DHCP scope. Don't forget to enable Security Fabric Connection, this will allow the AP to build the tunnel automatically with FGT.

and make this VLAN as Native VLAN on the ports where the APs are connected:

- Emirjon
If you have found a solution, please like and accept it to make it easily accessible for others.

View solution in original post

KennyLi · ‎10-13-2023

Hi elilcari,

Thanks, I will try it later and get back to you, upon upcoming maintenance schedule