This read-write INTEGER lets an admin change the IANA interface type assigned to a port, and doing so wipes related state such as the ifTable entry, performance-monitoring data, GFP/VCG entries, and current alarms for that port. Because changing this value effectively reprovisions the port as a different interface type, an admin must treat writing to it as a disruptive operation rather than a routine tweak. For example, an admin repurposing a slot from one transport encapsulation to another would set this object to the new IANA ifType value, understanding that the port's prior alarm and PM history will be cleared as a result.