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Configuring IP Multicast Routing
IP Multicast Configuration Examples
IPC-456
Cisco IOS IP Configuration Guide
The configurations for Router A and Router C are as follows:
Router A—First Hop Router Configuration
interface ethernet 0
ip directed-broadcast
ip multicast helper-map broadcast 224.5.5.5 120
ip pim dense-mode
!
access-list 120 permit udp any any eq 4000
access-list 120 deny udp any any
ip forward-protocol udp 4000
Router C—Last Hop Router Configuration
interface ethernet 2
ip directed-broadcast
ip multicast helper-map 224.5.5.5 178.21.34.255 135
ip pim dense-mode
!
access-list 135 permit udp any any eq 4000
access-list 135 deny udp any any
ip forward-protocol udp 4000
Stub IP Multicast Example
The following example shows how to configure stub IP multicast routing for Router A. Figure 74
illustrates the example. On stub Router A, the interfaces must be configured for PIM dense mode. The
helper address is configured on the host interfaces. Central site Router B can be configured for either
PIM sparse mode or dense mode. The access list on Router B denies any PIM messages from Router A.
Figure 74 Stub IP Multicast Routing Scenario
The configurations for Router A and Router B are as follows:
Router A Configuration
ip multicast-routing
ip pim dense-mode
ip igmp helper-address 10.0.0.2
Host
Stub region
Router A
10.0.0.1 10.0.0.2
Router B
Stub (leaf) router in
PIM dense mode
Central router denies
PIM messages
from Router A
43283
Host