You can interactively route with Electra using AutoTRAX.
This video show you how you can easily auto-route a PCB using AutoTRAX and Electra. In particular it shows you an example of restricting routing of a net to a specific layer.
To use Electra interactively check in Run Electra
at the top of the Electra Router Settings
Next click on the button in the PCB->Route menu.
The main AutoTRAX window will disappear and you will see the dialog below and Electra will start.
Do whatever you feel you need to do in Electra to route your PCB, see below.
You can click to minimize the above dialog.
You can also close it and even close AutoTRAX as so long as you have saved the project you can import the Electra route file.
Click to copy the write routes command to the clipboard so you can paste it into the Electra command: window to export the Electra route file. As soon as you save the route file, the above dialog will automatically disappear and the AutoTRAX main window will appear with the routed tracks.
In Electra you will see the AutoTRAX layers and named nets as shown below
After routing/editing your PCB in Electra you need to save your route file using the Electra File menu.
As soon as you save the route file, the above dialog will automatically disappear and the AutoTRAX main window will appear with the routed tracks. If you export as a different name click on the in the above dialog to import the route information into AutoTRAX.