You can configure E-series routers to support dynamic encapsulation type lockout. With this feature, you can temporarily prevent an ATM 1483 subinterface from autodetecting, accepting, and creating dynamic interface columns for a configurable time period.
On ATM 1483 subinterfaces, encapsulation type lockout is the default behavior for IPoA, bridged Ethernet, PPP, and PPPoE encapsulation types.