From: Murphy, William (William.Murphy@uth.tmc.edu)
Date: Mon Mar 31 2008 - 14:46:21 ART
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
Houston, TX 77030
Office: (713) 500-9947
Fax: (713) 500-0272
Mobile: (832) 594-0136
-----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
>
>
This archive was generated by hypermail 2.1.4 : Tue Apr 01 2008 - 07:53:55 ART