If you are not familiar with multicast, these are good resources for stumbling your way through it. I have a couple of PIM environments, so these are here for my reference.
multicast addresses
PIM and DVMRP build multicast trees, and are protocols for delivering multicast datagrams. The main difference between these two protocols is that PIM doesn’t rely on any unicast protocols to operate. Otherwise they are pretty much the same thing. They both build and maintain separate trees for every multicast source/group pair.
Jetcore Foundry gear will allow for hardware forwarding of multicast datagrams… the command is:
ip multicast-perf
1 million foot overview
A much more thorough overview is here: Multicast HOWTO