No, thats not true. You can use VLAN's without an VLAN-Interface. Only if you need Layer3-Features you configure a VLAN-Interface.
So the VLAN (on layer 2) works, even when i shutdown the Layer3 VLAN-Interface.
As I wrote, you can also remove the entire VLAN with "no vlan <VLAN ID>". The only problem is to remove the corresponding Layer3 VLAN-Interface, which still stays in the config even when I delete the Layer 2 VLAN.
When I removed the vlan from the VLAN-DB with "no vlan xxx" , there was still a "shutdown" in the interface vlan configuration. So the interface was not removed from the config. As soon as I removed the shutdown command from the interface vlan configuration, the interface vlan was gone from the config.
But this kind of removal of the interface vlan only works, if you remove the corresponding vlan from the VLAN-DB. If you need the vlan I see no way to remove the interface vlan. Workaround could be to remove the vlan from the DB so that the interface will be also removed and create the vlan again. But this will also remove the ports from this vlan.
Fortunately we have a CLI where portconfigs can easily be saved by copy and reapplied with paste :-)
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