That is the correct behavior. You could also change the Reset if you didn't want to receive the email or notification when the interface is back up. Alternatively if you are going to shut something down and complete some kind of maintenance etc you also have the options to briefly unmanage the device to stop polling it or simply mute the alerts for that device as well. I'm an Engineer with Loop1 and we provide SolarWinds professional/consultative services. I have a bit of free time today if you have any more questions. We actually have a SolarWinds 101 class for new SolarWinds users that can be a lifesaver if you've just gotten thrown into it.
Loop1 Systems: SolarWinds Training and Professional Services