Not enough information.

But I recall years ago the ATC system made heavy use of multicast in ways that scared me. I dunno if that stuff is still out there but it was some real I wouldn't do that shit if I were you stuff. And yeah mcast can sure fuck a network fast.

As for in general there's plenty of ways a single box can melt a network. Routing protocols let you do bad things fast and pull in more traffic than you can eat.