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Cisco Hoot and Holler over IP
Configuration Tasks
VC-836
Cisco IOS Voice, Video, and Fax Configuration Guide
Configuring Multicast Routing
To enable multicast routing, use the following commands beginning in global configuration mode:
Configuring the Virtual Interface
To configure the virtual interface for multicast fast switching, use the following commands beginning in
global configuration mode:
Command Purpose
Router(config)# ip multicast-routing
Enables multicast routing.
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
[secondary]
Assigns the IP address and subnet mask for the
virtual interface.
Step 3
Router(config-if)# ip pim {dense-mode | sparse mode |
sparse-dense-mode}
Specifies Protocol Independent Multicast (PIM).
Whatever mode you choose should match all the
interfaces in all the routers of your network.