Re: Multicast tunnel ques

From: George Roman (georgeroman@gmail.com)
Date: Wed Feb 04 2009 - 07:38:35 ARST


Gaurav,

You didn't give us enough information about your scenario? Are you using FR
between R2 R1 and R3 with R2 as a hub?

If this is the case, this behavior is expected since multicast cannot be
send back on the same interface it was received (i am talking here about
R2).
There is one exception to this: if you have sparse-mode and "nbma-mode"
option configured under that specific interface.

Best regards,
George

On Sun, Jan 18, 2009 at 11:21 AM, GAURAV MADAN <gauravmadan1177@gmail.com>wrote:

> Hi Group
>
> Again a ques on tunneling while dealing with multicast ( asked many but
> still question pops up from somewhere)
>
> R2
> / \
> / \
> R1 R3
> |
> |
> R4
> |
> R5
> |
> R6
> |f0/0
>
> Every where i am running PIM dense mode
> ON r6 f0/0 ; I have a join grp statement
> R5 , R4 , R1 , R2 all able to ping the multicast grp .. expected R3 not
> able
> to ping
>
> Ques : I am using tunnel ..... I find both of following work
>
> [A] tunn between R1 and R3
> [B] tunn between R2 and R3 .
>
> I have put tunnel in dense mode as well
>
> I do have idea whats happening and how things are working .. Can someone
> explain which solution is preferred over other in what situations ?
>
> Gaurav Madan
>
>
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