There is a great fear of Multicast from many network engineers I talk to. This comes from at its core, it being too easy to create cycles. At the internet scale

There is a great fear of Multicast from many network engineers I talk to. This comes from at its core, it being too easy to create cycles. At the internet scale the potential for cycles would be even higher, b/c the TTL needed would have to be on the order of ~20-30 hops, and many engineers will just set this number too high. Now I don't have experience with Source-specific Multicast, which is supposed to resolve the cycle problem, but I think there remains a lot of fear of Multicast in the industry. Can anyone else comment on cycle issues? Also, in terms of scaling, Multicast requires of copy of the packet on the router to every port which is registered as a listener to a Multicast address, this will increase load on the larger routers.