I have 4 cats and Jessica, the dwarf bunny. My cats tend to ignore Jessica, most of the time. Sometimes the youngest cat, Wolfy, gets excited when she runs around. He will sometimes chase her or smack her butt. He doesn't use his claws on her. None of my cats use their claws on her. They've never used their claws on anyone (human or otherwise).
Most of my bunny problems have been w/ litterbox use. Jessica likes to use the cats' litterboxes. I changed from scooping litter to yesterday's news to make it safe for bunny use. She is not free-roaming. Anytime we tried to let her roam, Jessica would pee on the couch and the cat bed. So she is caged during the day. She has a litterbox in her cage. We let her roam under supervision.
We have a pet gate at the living room doorway. It is short enough for my cats to jump over (I have 2 obese/old cats) and has a little doorway I can open when Jessica is cages. The cat food bowls are in the kitchen, attached to the livingroom. The kitchen has a tile floor, so Jess doesn't roam into the kitchen (she's not fond of the tile).
Bunnys are vegetarians and Cats are carnivores...therefore buns should NEVER eat cat food. Even if your cats get vegetarian food, there is a meat additive within the food b/c they are true carnivores. 2 of my cats show interest in Jess's food, but since it is in her cage, they've learned not to go into her cage.
Other than that we all get along VERY well! I've had my cats for a long time and I feel confident w/ knowing their nature. I am sure that they would not harm Jessica and when she did free roam we never had any problems. One of the cats stays upstairs anytime Jess is out and about. She would free roam regularly, but I'm not comfortable w/ her litterbox skills.