Interstellar travel, yes, but slower than light! In the Revelation Space books, it's either fusion powered starships of the "big cylinder full of people hibernating" variety, or admittedly somewhat magic relativistic starships (Bussard ramscoops in the earliest stories, but this was retconned out, and indeed a Bussard ramscoop shows up in a later story as a prototype that never really worked properly).
He has some sort of jump gate in at least some of his stories. I actually discovered him fairly recently based in part on the Love, Death, and Robots series on Netflix.
