User Manual

492
Users Manual of XGS-6350-24X4C
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
50.2.9 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
interfacetype 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: