Technical Tip: FortiSwitch looses configuration regarding internal interface after reboot

[laltuzar]

Description

This article describes how to resolve the issue where FortiSwitch is configured with a management VLAN different than 4094.

Scope

FortiSwitches with auto-network enabled.

Solution

A user configures the management interface as follows:

config switch interface
     edit "internal"
          set native-vlan 100
          set allowed-vlans 100
     next
end

FortiSwitch can be reached using an IP from VLAN 100.

Issue:

After the reboot of the FortiSwitch, it is not reachable anymore through this VLAN, so user needs to connect to the console port and reconfigure again.

Solution: Configure auto-network management VLAN as follows:

config switch auto-network
     set mgmt-vlan 100
end

Document reference: https://docs.fortinet.com/document/fortiswitch/7.6.1/fortiswitchos-administration-guide/163696/confi...