From: Joseph Brunner (joe@affirmedsystems.com)
Date: Thu Nov 08 2007 - 12:46:18 ART
No the client will listen to 255.255.255.255 also, it's a local broadcast.
That is just a caveat- the router realizes it's a directed broadcast, but
Sends by default to 255.255.255.255 instead of 126.1.28.255
-Joe
-----Original Message-----
From: Rich Collins [mailto:nilsi2002@gmail.com]
Sent: Thursday, November 08, 2007 10:19 AM
To: Anthony Sequeira
Cc: Joseph Brunner; Cisco certification
Subject: Re: Errors in the DOC-CD for Multicast Intermediate Helper
This has always confused me as well.
So on the final egress router in your example you would have this:
int S0/0
ip pim sparse-dense
ip multicast helper-map 239.254.2.5 126.1.28.255 105
int Fa0/0
ip add 126.128.1 255.255.255.0
ip directed-broadcast
ip broadcast-address 126.1.28.255
This is the best configuration to have the client of the application
pick up the UDP broadcast stream? I suppose this is better than the
default 255.255.255.255 broadcast which the client might not listen
to?
-Rich
On Nov 8, 2007 7:42 AM, Anthony Sequeira <Anthony_Sequeira@skillsoft.com>
wrote:
> Yeah - thanks Joe!
>
> This example used to be way off and had us placing commands on the wrong
> interfaces I believe.
>
> Anthony J. Sequeira
> #15626
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>
> Joseph Brunner
> Sent: Wednesday, November 07, 2007 9:58 PM
> To: Anthony Sequeira; 'Cisco certification'
> Subject: RE: Errors in the DOC-CD for Multicast Intermediate Helper
>
> You mean the new documentation way in-line with current IOS where we
> place
>
> This
>
>
> ip multicast helper-map 239.254.2.5 126.1.28.255 105
>
>
> on the interface facing the multicast , not sending the final "back to
> lan
> broadcast" ?
>
> One cool thing-
>
> By default IOS sends "directed broadcasts" to 255.255.255.255 (even if
> the
> command above specified "126.1.28.255" as the broadcast to address). If
> you
> *really* want to send the broadcast to the subnet broadcast (directed)
> address you need to put ip broadcast-address 126.1.28.255 on the out
> going
> interface...
>
> Lab it up sometime, check it out...
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Anthony Sequeira
> Sent: Wednesday, November 07, 2007 9:19 PM
> To: Cisco certification
> Subject: Errors in the DOC-CD for Multicast Intermediate Helper
>
> Hello all!
>
>
>
> I am too tired right now to investigate so I am looking for immediate
> assistance from the group...it would appear that Cisco has finally
> corrected the Multicast Helper example in the DOC-CD.
>
>
>
> Can someone please confirm....
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hi
> mc_c/chap10/mcbcigmp.htm#wp1084257
>
>
>
>
>
> Thanks in advance!
>
>
>
> Anthony J. Sequeira
>
> #15626
>
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