Technical Tip: Standalone FortiSwitch default configuration to avoid loosing VLAN configs

yabhishek · ‎09-30-2024

Description

This article describes the default configuration on the standalone FortiSwitch to prevent VLAN config lost on trunk interfaces.

Scope

FortiSwitch in Standalone mode.

Solution

When FortiSwitch is configured as standalone mode, then the default 'native-vlan' on the internal interface should be 1 as mentioned below:

For Example:

config switch interface

edit "internal"

set description ''

set native-vlan 1

Sometimes due to the auto-network feature, this 'native-vlan' changed to 4094 after the reboot of the switch.

For example:

config switch auto-network

set status enable

set mgmt-vlan 4094

end

This will make the native VLAN changed to 4094 after the reboot of the switch:

config switch interface

edit "internal"

set description '' "

set native-vlan 4094

This will cause a change in the 'native-vlan' on all the trunk interfaces created on the standalone switch from the expected VLAN to 4094 :

config switch interface

edit "PO1"

set native-vlan 10 <----- Will change to 4094.

set native-vlan 20 <----- Will change to 4094.

'auto-network' should be disabled on the standalone switches to avoid 'vlan-config' losses on trunk interfaces after reboot.

config switch auto-network

set status disable

end

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