[ScreenOS] How to change the VLAN tag

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This article provides information on how to change the VLAN tag on ScreenOS devices.

When trying to change the sub-interface tag, I get the error "vlan tag can't be changed.  Use the unset/set interface cmd."

Even though the sub-interface is not used in the configuration, I still cannot change the tag.

Sample errors:

Error message - failed command
This is a design feature on the high-end devices.
To change the VLAN tag, the sub-interface must be removed and re-created with the desired tag.

NOTE: On SSG Series devices, the VLAN tag can be changed without deleting the sub-interface. While doing so, ensure that the sub-interface is not used anywhere in the configuration.
Modification History:
2019-06-05: Content reviewed for accuracy.
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