Cisco Systems 3200 User Manual

This section describes how to configure IP multicast Layer 3 switching.

You must enable IP multicast routing globally before you can enable IP multicast Layer 3 switching on 
Layer 3 interfaces.

For complete information and procedures, refer to these publications:

Cisco IOS IP Configuration Guide, Release 12.2, at this URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/

Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2 at this 
URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipras_r/index.htm

Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2 at this URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprrp_r/index.htm 

Cisco IOS IP Command Reference, Volume 3 of 3: Routing Protocols, Release 12.2 at this URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fiprmc_r/index.htm

To enable IP multicast routing globally, Use this command in global configuration mode:

You must enable PIM on the Layer 3 interfaces before IP multicast Layer 3 switching functions on those 
interfaces.

To enable IP PIM on a Layer 3 interface, use the following commands beginning in global configuration 
mode:

This example shows how to enable PIM on an interface using the default mode (sparse-dense-mode):

Router(config-if)# ip pim

Router(config-if)# 

This example shows how to enable PIM sparse mode on an interface:

Router(config-if)# ip pim sparse-mode

Router(config-if)# 

Router(config)# ip multicast-routing

Enables IP multicast routing globally.

Router(config)# interface vlan 

vlan_id 

{slot/port}

Selects the interface to be configured.

Router(config-if)# ip pim {dense-mode | 

 | sparse-dense-mode}

Enables IP PIM on a Layer 3 interface.