From: slevin kremera (slevin.kremera@gmail.com)
Date: Tue Oct 16 2007 - 23:12:10 ART
GOT IT FROM DOC CD
examples
The following example shows how to allow IP multicast routing in a
multicast-capable internetwork between two broadcast-only internetworks.
In this example, assume that a server on the LAN connected to the Ethernet
interface 0 of the first hop router is sending a UDP broadcast stream with a
source address of 126.1.22.199 and a destination address of
126.1.22.255:4000. Based on that scenario, the configuration on the first
hop router converts the broadcast stream arriving at incoming Ethernet
interface 0 destined for UDP port 4000 to a multicast stream. The access
list permits traffic being sent from the server at 126.1.22.199 being sent
to 126.1.22.255:4000. The traffic is sent to group address 239.254.2.5. The ip
forward-protocol command specifies the forwarding of broadcast messages
destined for UDP port 4000.
The second configuration on the last hop router converts the multicast
stream arriving at incoming Ethernet interface 1 back to broadcast at
outgoing Ethernet interface 2. Again, not all multicast traffic emerging
from the multicast cloud should be converted from multicast to broadcast,
only the traffic destined for 126.1.22.255:4000.
The configurations for the first and last hop routers are as follows:
First Hop Router Configuration
interface ethernet 0
ip address 126.1.22.1 255.255.255.0
ip pim sparse-mode
ip multicast helper-map broadcast 239.254.2.5 105
access-list 105 permit udp host 126.1.22.199 host 126.1.22.255 eq 4000
ip forward-protocol udp 4000
Last Hop Router Configuration
interface ethernet 1
ip address 126.1.26.1 255.255.255.0
ip pim sparse-mode
ip multicast helper-map 239.254.2.5 126.1.28.255 105
interface ethernet 2
ip address 126.1.28.1 255.255.255.0
ip directed-broadcast
access-list 105 permit udp host 126.1.22.199 any eq 4000
ip forward-protocol udp 4000
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