Hi Jeronimo,
What is your EXOS version?
Please take a look at this command and its completion:
configure vlan untagged-ports auto-moveIt might be set to 'on' and I thing thats the case.
It might be set to informational or turned off, the latter will induce an error when you try to move a port untagged from one VLAN to another VLAN as untagged.
There is no such thing as moving ports between VLANs when they are tagged, as port can be a member of many VLANs when tagged. I doubt should it ask you "are you sure", as you're the expert to know what's going on. ļ And an output that is exactly the same what you have issued in CLI is not useful at all - it doesn't make sure you're on the correct switch, that you will be sure of when phones begin to call. š
On the other hand, feature like commit/rollback would be awesome.
HTH,
Tomasz