From: Shaikh, Nasir (Nasir.Shaikh@atosorigin.com)
Date: Wed Dec 07 2005 - 09:48:22 GMT-3
When converting multicast to broadcast you have to use the broadcast address of the destination subnet.
e.g if the interface address of the destination subnet is 172.16.1.0 /28 and you are converting the multicast stream for 224.5.5.5 then your command would be:
ip multicast helper-map 224.5.5.5 172.16.1.15 <with eventual access-list>
remember to enable directed broadcast on the appropriate interfaces.
regards
Nash
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
steven richards
Sent: vrijdag 2 december 2005 23:50
To: Lee.Donald@t-systems.co.uk; ccielab@groupstudy.com
Subject: RE: Using the IP Multicast Helper Map command
In that case the example on the doc cd shows 172.16.0.0 as being the
destination address. But it also makes mention of if you want to broadcast
to all hosts on the subnet use 172.16.0.255. So if my destination was on the
172.16.0.X subnet would I use 172.16.0.255 or 172.16.0.0 ?
Thanks,
>From: Lee Donald <Lee.Donald@t-systems.co.uk>
>To: 'steven richards' <ccie_2005@hotmail.com>, ccielab@groupstudy.com
>Subject: RE: Using the IP Multicast Helper Map command
>Date: Fri, 2 Dec 2005 11:10:51 -0000
>
>Steve,
>
>Multicast or broadcasts could not be sent to just one unicast address no.
>
>At the destination this multicast would be turned into a broadcast and
>flooded out onto the local subnet, this would go to all hosts.
>
>HTH
>
>Lee.
>
>
>
>-----Original Message-----
>From: steven richards [mailto:ccie_2005@hotmail.com]
>Sent: Friday, December 02, 2005 10:57 AM
>To: ccielab@groupstudy.com
>Subject: Using the IP Multicast Helper Map command
>
> I am trying to understand how this command is used to convert from
>broadcast to multicast and then back to broadcast to a single host address.
>From this example from what I can see if I wanted to convert the multicast
>to broadcast on the destination subnet I can use ip broadcast-address
>172.16.0.255 and ip multicast helper-map 224.5.5.5 172.16.0.255 ? At least
>I
>
>think ;) Would I just be able to send this to a single host on the
>destination side ? Like if I just wanted to send this to 172.16.0.11 would
>I
>
>use ip broadcast-address 172.16.0.11 and ip multicast helper-map 224.5.5.5
>172.16.0.11 ?
>
> Thanks,
>
>
>http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr
>mc_r/mult/1rfmult2.htm#wp1089138
>
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