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Chapter 15
Configuring IP Multicast
Enabling IP Multicast Routing
IP multicast routing allows the Cisco IOS software to forward multicast packets. To enable IP multicast
routing on the Cisco 10000 router, enter the following command in global configuration mode:
Command
Router(config)# ip multicast-routing
If you enable IP multicast fast switching on one interface, you must enable it on all outbound interfaces
Note
on the router. Failure to do so results in the router sending duplicate multicast packets out the interface
that has fast switching enabled.
Enabling PIM on an Interface
The protocol-independent multicast (PIM) protocol maintains the current IP multicast service mode of
receiver initiated membership. Enabling PIM on an interface also enables IGMP operation on that
interface. Configure an interface in one of the following modes:
•
•
•
The mode determines how the Cisco 10000 router populates its multicast routing table and how it
forwards multicast packets it receives from its directly connected LANs. You must enable PIM in one of
these modes for an interface to perform IP multicast routing.
For more information, see the "IP Multicast" chapter in the Cisco IOS IP Configuration Guide,
Release 12.2.
Enabling Dense Mode
To configure PIM on an interface to be in dense mode, enter the following command in interface
configuration mode:
Command
Router(config-if)# ip pim dense-mode
OL-2226-23
Dense mode
Sparse mode
Sparse-dense mode
Purpose
Enables IP multicast routing.
Purpose
Enables dense mode PIM on the interface.
Cisco 10000 Series Router Software Configuration Guide
Configuration Tasks for IP Multicast Routing
15-35
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Troubleshooting
