Once the network design part is
completed, the network diagram along with the configured data (such as host
name, ip address, and mask addresses) can be exported for use with the
simulator. We can open this Exported file in the network simulator and configure it
further according to the requirement.
The menu item "Export
Configuration" is used to export the network diagram:

As shown in the figure above, use "Export Configuration" to export the network diagram for use in the network simulator. By default the files are stored in "user" directory with extension ".exp" as shown below:

It is possible to store these file under a different directory, to do so select the directory under which this file has to exported can click on Save button in the Dialogue box
Below figure shows the process for Exporting the Network to Router Simulator.