Cisco Systems VC-825 Configuring Multicast Routing, Configuring the Virtual Interface, VC-836

Cisco Hoot and Holler over IP

Configuration Tasks

Configuring Multicast Routing

To enable multicast routing, use the following commands beginning in global configuration mode:

Command	Purpose
Router(config)# ip multicast-routing	Enables multicast routing.

Configuring the Virtual Interface

To configure the virtual interface for multicast fast switching, use the following commands beginning in global configuration mode:

	Command	Purpose
Step 1
	Router(config)# interface type number [name-tag]	Defines a virtual interface for multicast fast
		switching. Routers joining the same session must
		have their virtual interfaces on different subnets.
		Otherwise, packets are not switched to the IP
		network.
Step 2
	Router(config-if)# ip address ip-address mask	Assigns the IP address and subnet mask for the
	[secondary]	virtual interface.
Step 3
	Router(config-if)#ip pim {dense-mode sparse mode	Specifies Protocol Independent Multicast (PIM).
	sparse-dense-mode}	Whatever mode you choose should match all the
		interfaces in all the routers of your network.

Cisco IOS Voice, Video, and Fax Configuration Guide

VC-836