Forgot completly my 2nd post. That was a big mistake on my end. I confirmed with Dell support. You were actually right, it is the "switchport access" command, even in trunk mode, that set the native vlan. Thanks !
Hi, We just received our brand new S4112T with OS10 on it. First time for me on that OS. Here is my problem :  I don't see where we can configure the native (Cisco like) or untagged VLAN per port. I only see the command to change de default VLAN for the switch globally.But let's say that I want, in trunk mode, the following configuration for 2 different ports :  Ethernet 1/1/1 Untagged VLAN : 1  Mode : Trunk Tagged VLAN : 41,43,44,45   Ethernet 1/1/2 Untagged VLAN : 41 Mode : Trunk Tagged VLAN : 43,44,45   I can't found anywhere that info. Normally, on a per port config (let say on a Cisco device), it's pretty easy since we have the command : #switchport trunk allowed native vlan This was even in the old N4000 series OS...Thanks !
Dell S4112T OS10 : Native (Untagged) VLAN.