Hello
If we want to create a static route that will depend on the line protocol of your interface, you can do this:
ip route 0.0.0.0 0.0.0.0 tunnel0 155.1.0.5
OR this:
ip route 0.0.0.0 0.0.0.0 155.1.0.5 track 1
track 1 interface tunnel0 line-protocol