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ip pim dense-mode

Use this command to enable PIM-DM on the specified interface. Use the
no form to disable PIM-DM on this interface.
Syntax
ip pim dense-mode
no pim dense-mode
Default Setting
Disabled
Command Mode
Interface Configuration (VLAN)
Command Usage
To fully enable PIM-DM, you need to enable multicast routing globally
for the router with the ip multicast-routing command (page 3-187),
enable PIM-DM globally for the router with the router pim command
(page 3-203), and also enable PIM-DM for each interface that will
participate in multicast routing with the ip pim dense-mode
command.
• If you enable PIM on an interface, you should also enable IGMP on
that interface.
Dense-mode interfaces are subject to multicast flooding by default, and
are only removed from the multicast routing table when the router
determines that there are no group members or downstream routers, or
when a prune message is received from a downstream router.