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AhmedZalat
AhmedZalat
New Member
June 23, 2026
Question

Trunk between Fortiswitch and Cisco Switch and FS connected to FG

  • June 23, 2026
  • 2 replies
  • 63 views

 

 

 

 

If i connect S1 “Fortiswitch” to S2 “Cisco ”   Using trunk port and in trunk port I allowed VLAN 20 only 

on FortiGate  i create policy to route between VlAN 10 and VLAN 20 

  1. Can PC1 in VLAN 10 ping to PC2 in VLAN 20 and if yes why and if no Why ?

      2. Is trunk port control traffic between different Vlan when i allowed VLAN 20 only in trunk or FortiGate will control traffic between different vlan ?

 

2 replies

Stephen_G
Staff & Editor
Stephen_G
Staff & Editor
June 25, 2026

Hi AhmedZalat,

 

Thank you for using Fortinet Community Forums. We’ll try to find someone who can help you.

Stephen_G - Fortinet Community Team
funkylicious
SuperUser
funkylicious
SuperUser
June 25, 2026

1 it should work; the FortiGate will strip the VLAN ID of the initiator and it will forward it attaching the new VLAN ID when doing the inter-vlan routing

2 if you have a PC in VLAN10 connected and configured on S2 and want to communicate to another PC in VLAN10 on S1 , due to the fact that only VLAN20 is permitted , traffic it will be dropped

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