you are allowed one and a half steps after stopping to dribble. But the refs do a terrible job of calling travelling.
IMO, it's not travelling when you loose control of the ball because someone bumped you. That's a foul. I see it so many times when a team is breaking down the floor, and a defender takes a swipe, hit's the player, and the ball goes out of bounds.
It seems to have a lot to do with WHO the player is. Some players get away with murder on the court with no penalty. Other players get called for travelling even when they didn't.