9.5 Configure IP Multicast Routing
9.5.3
PIM-SM configuration
PIM-SM is only slightly more complicated to configure than PIM-DM. All you need is knowledge of three configuration commands, and you can have sparse mode up and running. As in PIM-DM, you need to enable PIM on each router in the network by using the following global command:

Router(config)#ip multicast-routing

Next, enable PIM-SM on every interface in every router in the network by using the following interface command:

 Router(config-if)#ip pim sparse-mode

The final step is to configure each of the routers in the network with the IP address of the RP using the following global command:

Router(config)#ip pim rp-address <address>

This command tells the router where to send the (*, G) joins when it needs to join the shared tree in sparse mode.

Lab Activity
  In this lab activity, you will learn how to configure multicast routing on the Route Switch Module using Sparse Mode Protocol-Independent Multicast.