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Command Mode
Global Configuration
Command Usage
This command is used to enable multicast routing globally for the
router. You also need to globally enable a specific multicast routing
protocol using the router dvmrp or router pim command, and then
specify the interfaces that will support multicast routing using the ip
dvmrp or ip pim dense-mode commands.
Example

show ip mroute

Use this command to display the IP multicast routing table.
Syntax
show ip mroute [group-address source] [summary]
group-address - An IP multicast group address with subscribers directly
attached or downstream from this router.
•source - The IP subnetwork at the root of the multicast delivery tree.
This subnetwork contains a known multicast source.
summary - Displays summary information for each entry in the IP
multicast routing table.
Command Mode
Privileged Exec
Command Usage
This command displays information for multicast routing. If no
optional parameters are selected, detailed information for each entry in
the multicast address table is displayed. If you select a multicast group
Console(config)#ip multicast-routing
Console(config)#