vlan issues

on the SM we nat disable we place them on different VLANs and then move the MVID to 3

now and then we get customers plugging our SM in their managed switches without configuring their vlan’s / STP correctly, this starts to mess with our network…

we switched on “allow untagged packets only” but this is not helping…
any ideas ?

also turn off dynamic learning

yes we already do that…