SCCM 2012: multicasting

Hi,

We have a perfectly working SCCM 2012 SP1 OS deployment environment in test.
Now we would like to do further test with network department in order to test multicasting (the ghost-way in order to save bandwith). We now boot with ISO in order to not interfere with current (PXE environment) OS deployment (SCCM 2007).

So there is this "Enable multicast ..." on the distribtion point but what are the next steps?

J.

Jan Hoedt