Configuration prerequisites
SSM is a global configuration. When you enable SSM on a switch, it is enabled on all interfaces running PIM. Also note that when you enable SSM, the switch handles all the groups that are not in the SSM range with regular PIM-SM.
Before you can configure SSM, you must prepare the router as follows:
- Configure an IP interface.
- Configure a unicast protocol (RIP or OSPF) globally and on the interfaces where you want to configure PIM.
| PIM requires a unicast protocol in order to forward multicast traffic within the network when performing the Reverse Path Forwarding (RFP) check. PIM uses the information from the unicast routing table to create and maintain the shared and shortest multicast tree that enables PIM-enabled routers to communicate. The unicast routing table must contain a route to every multicast source in the network. |
- Enable PIM globally.
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