This enumerated object specifies what action the interface takes once a storm-control threshold is exceeded on it. Admins choose drop(3) to keep the port up while discarding excess storm traffic, or shutdown(2) to error-disable the port entirely when abusive traffic persists past the retry count. Setting it to shutdown(2) on an access port means the port is administratively taken down once storm traffic exceeds the rise threshold for the configured number of retries.