Setting up a simple multicast. The 4500 has the "ip multicast-routing" command on. All vlans have the "ip pim sparse-mode" and are located on the core.
The vlans are then trunked out throught the gig interfaces to the edge 3750 switches. The 3750 switches have no multicast commands on them.
WE have to sites with the exact same configs. One site works and the other does not.