Methods and apparatus to convert configuration data associated with a first router are disclosed. Example methods include receiving via a graphical user interface a user selection of a first port associated with the first router and a second port associated with a second router and detecting data flow on a subinterface associated with the first port. The method also includes converting the configuration data from a first format to a second format based on the detected data flow, the configuration data being associated with the subinterface. In some examples, the method further includes preventing conversion of the configuration data associated with the subinterface if data flow is not detected.