From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Mon Mar 31 2008 - 14:49:41 ART
Multicast Command reference 12.4 has the correct configuration for IP
multicast helper-map
On Mon, Mar 31, 2008 at 9:46 PM, Murphy, William <William.Murphy@uth.tmc.edu>
wrote:
> As I recall the command is only required on the interface where the
> broadcast is "exploded" into a link-layer broadcast...
>
> Bill Murphy
> Senior Network Analyst
> University of Texas Health Science Center - Houston
> 6901 Bertner, Suite 432
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>
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Athaide, Dwayne
> Sent: Sunday, March 30, 2008 5:19 AM
> To: omair naim; groupstudy
> Subject: RE: Mulitcast helper map
>
> Thanks for the explanation. So wouldn't the "ip directed-broadcast"
> command be needed on R2 S1/2 as well. The Solution guide has it on R3
> S1/3
>
> Thanks
>
> From: omair naim [mailto:omairnaim1@hotmail.com]
> Sent: Saturday, March 29, 2008 3:41 PM
> To: Athaide, Dwayne; groupstudy
> Subject: RE: Mulitcast helper map
>
>
>
>
> Lab 12, you have multicast running at R3 interface S1/2 so R3 can read
> this multicast packet of 225.25.25.25 but same interace on R3 interface
> S1/3 is not part of multicast. So thats why once you get multicast feed
> from VLAN17 (225.25.25.25), you will need to convert it into broadcast
> to be sent out on S1/3 on R3. These broadcast packets than reaches R2 on
> interface S0/1, here you will need to convert them back to multicast
> packets thats why you see this helper command configured on this
> interface.
>
> You could also put ip multicast helper-address broadcast 225.25.25.25
> 111 on Fa0/0 on R1 and it should work but knowing R3 is a sort of
> multicast boundry router its better do it on R3. I hope this clear your
> confusion.
>
> Later
> Omair
>
> > Subject: Mulitcast helper map
> > Date: Sat, 29 Mar 2008 15:13:48 -0500
> > From: DAthaide@eprod.com
> > To: ccielab@groupstudy.com
> >
> > I am trying to make sense of Internetwork Expert lab 12 Task 6.2 which
> > is Multicast Distribution. How is it different from LAB 8 Task 5.5
> >
> > >
> > In lab 12
> >
> > Why is the "ip multicast helper-address broadcast 225.25.25.25 111"
> > configured in the Solution guide on the S0/1 port. Shouldn't it be on
> > the f0/0 port.
> >
> > Also shouldn't the "ip multicast helper-map 225.25.25.25 129.1.17.255
> > 111 " be on the S1/3 on R3 and the ip directed broadcast on S1/2 of
> R3.
> >
> >
> >
> > Please someone help me understand multicast helper-map. The DOC CD is
> > confusing
> >
> > thanks
> >
> >
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