Support Forum
The Forums are a place to find answers on a range of Fortinet products from peers and product experts.

Fortiswitch - ISL query

Hi, I am new to Fortiswitch. We have 2 Fortiswitch (124) acting as our WAN switch to do WAN link extension to our Fortigate A-P cluster. I read lot of documents which says to connect ISL link between two fortiswitches. But I really dont want  ISL link between these switches to pass vlans across switches. I will connect ISP link at each switches and just want to do L2  cross connection/extension of these WAN links to FG cluster. For management, I want to connect Fortilink from both the fortigate to fortiswitches. Can I skip ISL link on this scenario? 

Not applicable

Hello rajamanickam, 


Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 



 Fortinet Community Team




From what i understand, you want to connect FGT (2 ports) - 1 port connecting to FSW1 and 1 port connecting to FSW2. Both switches managed by FGT.

FSW1 connected to ISP1 and FSW-ISP2.

This can be achieved. You can use interface type as "hardware switch" on FGT


Could you please send the documentation link where it says to connect ISL.


Sachit Das
ETAC Engineer
Wifi-Switching – International Support

Select Forum Responses to become Knowledge Articles!

Select the “Nominate to Knowledge Base” button to recommend a forum post to become a knowledge article.

Top Kudoed Authors