I am setting up a hub and spoke network that will be routing a lot of multicast traffic. The 2821 spokes will be routing traffic between the local VLANs on 3750's as well as multicast traffic from the other spokes local networks. The mutlicast sources acquire their multicast using the last three octets from the host's IP address which is assigned dynamically. I have setup DMVPN phase 2 between all of the spokes. My question is what is the best way to setup multicast routing between all of the spokes at this point? I was looking at using Anycast RP but am not sure about my decision. Please excuse me if this question doesn't make much sense. It is late and I am not vary familiar with multicast.