Appendix C Switch Port Functionality

IP Multicast Layer 3 Switching

IP Multicast Layer 3 Switching

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:

Command

Purpose

 

 

Router(config)# ip multicast-routing

Enables IP multicast routing globally.

 

 

Enabling IP PIM on Layer 3 Interfaces

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:

 

Command

Purpose

Step 1

 

 

Router(config)# interface vlan vlan_id

Selects the interface to be configured.

 

{slot/port}

 

Step 2

 

 

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

Enables IP PIM on a Layer 3 interface.

 

sparse-mode sparse-dense-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)#

Cisco 3200 Series Router Hardware Reference

 

C-10

OL-5816-10

 

 

 

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Cisco Systems 3200 manual IP Multicast Layer 3 Switching, Enabling IP PIM on Layer 3 Interfaces

3200 specifications

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