Unable VLANs allowed after Upgrade firmware Fortios 7.6.0 - 7.6.3

Forum|Forum|1 year ago
May 29, 2025
3 replies
2185 views

After upgrading the firmware FortiOS Fortigate 60F from version 7.4.7 to 7.6.0, only the native VLAN is available for use. Allowed VLANs no longer function on the FortiSwitch ports.

Ports with two "Allowed VLANs" configured are not working or are unavailable. Only the "Native VLAN" works.

Later versions 7.6.1, 7.6.2, 7.6.3 don't fix it.

I have to downgrade to firmware version 7.4.7 for it to work successfully.

I will wait for a correction to that Bug.

FortiGate

knaveenkumar

Staff

Hi team ,

we see that in 7.6.1 and 7.6.2 some know issue for vlan are below:

===========================================================

in 76.1 we see that After a firmware upgrade, some vlan interfaces attached to a LAG interface are not displayed in the GUI.

Also, 7.6.2 After a firmware upgrade, the VLAN interface used in IPsec, SSL VPN, or SD-WAN is not displayed in the interface list or SD-WAN page and cannot be configured in the GUI.

nebredavAuthor

New Member

Example: You have two devices connected to port 1 of the Fortiswitch, with different VLANs. The PC VLAN 10 is connected to the IP Phone VLAN 20, and the IP Phone is connected to port 1. If the native VLAN is VLAN 10, then VLAN 10 works, and the other VLAN is disabled and not allowed. This is an error. It works up to firmware version 7.4.7.

HarryTran

Staff

I will reproduce in our lab.

nebredavAuthor

New Member

Example: You have two devices connected to port 1 of the Fortiswitch, with different VLANs. The PC VLAN 10 is connected to the IP Phone VLAN 20, and the IP Phone is connected to port 1. If the native VLAN is VLAN 10, then VLAN 10 works, and the other VLAN is disabled and not allowed. This is an error. It works up to firmware version 7.4.7.

HarryTran

Staff

Thanks for your further detail!

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