Multicast Over DMVPN

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Once you've got your DMVPN up and running, as shown in the DMVPN article, you can enable multicast and PIM.

You just need to know the IP address of your rendezvous point (RP). Then you can roll this out to your hub(s).

ip multicast-routing
interface Tunnel0
 description DMVPN
 ip pim dr-priority 20
 ip pim sparse-mode
ip pim rp-address

The spokes get the same configuration, minus the dr-priority line.