From: Venkataramanaiah.R (vramanaiah@gmail.com)
Date: Sun Dec 11 2005 - 03:21:01 GMT-3
Hello Victor, You are right, DR does not play any role when used with DM.
However, it has some significance when you use it along with IGMPv1 on your
LAN segment. When IGMP v1 is used, the router elected as PIM-DR becomes the
IGMP Querier for that segment as well. Of course IGMPv2 has its own querier
election process and so it does not use the DR which is elected by PIM.
Your second question is not very clear to me.
-Venkat
On 12/11/05, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
>
> Hello Guys
>
>
>
> I have this confusion today, I was reading Beau book about PIM-DM, and I
> can
> see that in an example 6-1, show that in PIM-DM, is elected a DR for a Lan
> Segment. --- ok there is a note saying that DR is primarily used in sparse
> mode..
>
>
>
> But Why then a DR is elected in PIM-DM?
>
>
>
> Ok another question in the similar context
>
>
>
> To enable PIM you must enable IP MULTICAST, ok that is the procedure so
> cool!
>
>
>
> But I do not understand this for example, we can enable ospf (without
> talking of other protocols that uses multicast as the mean to transmit
> messages) without enabling multicast in the global process? Any reason for
> this?
>
>
>
> Thanks
>
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