User's Manual

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broadcast message.
ip forward-protocol
[port]
Configures the port number allowing to
forward the message.
Example
The following example shows how to configure the command ip multicast helper.
The configuration of the router is shown in the following figure. Configure the command ip directed-broadcast
on the e0 port of the first-hop router to handle the directional message. Configure ip multicast helper-map
broadcast 230.0.0.1 testacl1, allowing to convert the UDP broadcast message with port number 4000 that is
sent from the source address 192.168.20.97/24 to the multicast message with the destination address
230.0.0.1.
Configure the command ip directed-broadcast on the e1 port of the last-hop router to handle the directional
message. Configure ip multicast helper-map 230.0.0.1 172.10.255.255 testacl2, allowing to convert the
multicast message with port number 4000 and the destination address 230.0.0.1 that is sent from the source
address 192.168.20.97/24 to the broadcast message with the destination address 172.10.255.255.
In the first-hop router connecting the source broadcast network, perform the following operations: (the router
is configured on the VLAN port)
interface ethernet 0
ip directed-broadcast
ip multicast helper-map broadcast 230.0.0.1 testacl
ip pim-dm
!
ip access-list extended testacl permit udp 192.168.20.97 255.255.255.0 any
ip forward-protocol udp 4000
In the last-hop router connecting the destination broadcast network, perform the following operations:
interface ethernet 1
ip directed-broadcast
ip multicast helper-map 230.0.0.1 172.10.255.255 testacl2
ip pim-dm
!
ip access-list extended testacl2 permit udp 192.168.20.97 255.255.255.0 any
ip forward-protocol udp 4000
72.6 Configuring Stub Multicast Route
Run the commands ip igmp helper-address and ip pim-dm neighbor-filter to configure the Stub multicast
route.
On the port where the stub router and the host are connected, perform the following operations:
Command Purpose
interface
type number Enters the interface configuration mode.
ip igmp helper-address
destination-
address
Configures the command
ip igmp helper-
address
to forward the multicast message to the
central router.
On the port where the central router and the stub router are connected, perform the following operations:
Command Purpose